JP6955751B2 - Concentration detector and machine tool system - Google Patents

Description

The present invention relates to a concentration detecting device for detecting the concentration of the stored water-soluble cutting fluid, and a machine tool system including the concentration detecting device.

As a technique for detecting the concentration of water-soluble cutting oil, Patent Document 1 discloses an automatic management device for water-soluble cutting oil. The automatic management device for water-soluble cutting oil includes a liquid storage tank (coolant tank) for storing water-soluble cutting oil and a concentration sensor for measuring the electric conductivity of the water-soluble cutting oil stored in the liquid storage tank.
Patent Document 1 stores a relational expression showing the relationship between the concentration (dilution ratio) of the water-soluble cutting oil and the electric conductivity, and based on the electric conductivity measured by the concentration sensor and the stored relational expression, the water-soluble cutting The oil concentration is calculated.

Japanese Unexamined Patent Publication No. 9-85577

In Patent Document 1, the concentration of the water-soluble cutting oil is calculated from the electric conductivity measured by the concentration sensor, but the water-soluble cutting oil is made by taking into account the fluctuation of the electric conductivity due to the temperature change of the water-soluble cutting oil. It does not calculate the concentration of.
Therefore, in Patent Document 1, the concentration of the water-soluble cutting oil stored in the liquid storage tank cannot be calculated with high accuracy.

An object of the present invention is to provide a concentration detecting device capable of accurately calculating the concentration of a stored water-soluble cutting fluid, and a machine tool system including a concentration detecting device.

A first aspect of the present invention is a concentration detection device that detects the concentration of the stored water-soluble cutting liquid, and detects the measured liquid temperature Tg of the stored water-soluble cutting liquid immersed in the stored water-soluble cutting liquid. and the liquid temperature detecting means for, being arranged in the liquid temperature detecting means, is immersed in the pooled water-soluble cutting fluid, and electrical conductivity detecting means for detecting an actual electric conductivity σg of the reservoir water-soluble cutting fluid, concentration A plurality of different concentration data of the above are stored, and the water-soluble cutting liquid having the same component as the stored water-soluble cutting liquid and having each concentration corresponding to the respective concentration data is used as the water-soluble cutting liquid having each concentration. A storage means for storing a linear functional expression indicating the relationship between the liquid temperature and the electric conductivity of the corresponding water-soluble cutting liquid, the measured liquid temperature Tg detected by the liquid temperature detecting means, and the detection of the conductivity detecting means. a measured electrical conductivity Shigumag, and a calculation control means for inputting the measured electrical conductivity Shigumag during actual liquid temperature Tg at the same time, the arithmetic control unit, said each density data, the water-soluble of each concentration The linear function formula corresponding to the cutting liquid is read from the storage means, and the measured liquid temperature Tg input from the liquid temperature detecting means and the linear function formula corresponding to the water-soluble cutting liquid of each concentration are used to obtain the respective concentrations. Calculated electric conductivity σbn of the water-soluble cutting liquid of A calibration line F (T) indicating the relationship between the concentration of the water-soluble cutting liquid at the measured liquid temperature Tg and the measured electrical conductivity σg of the water-soluble cutting liquid at the measured liquid temperature Tg corresponding to Tg was calculated, and the conductivity was calculated. The measured electrical conductivity σg input from the rate detecting means, and the concentration of the stored water-soluble cutting liquid is determined based on the measured electrical conductivity σg at the measured liquid temperature Tg and the calculated calibration line F (T). It is a concentration detection device characterized by calculating.

Claim 2 according to the present invention has a liquid storage tank that stores a water-soluble cutting liquid, and processes the work while supplying the water-soluble cutting liquid stored in the liquid storage tank to the work piece. It is configured to include a machine tool for collecting the water-soluble cutting liquid supplied to the liquid storage tank and a concentration detecting device for detecting the concentration of the water-soluble cutting liquid stored in the liquid storage tank. The apparatus is similar to the liquid temperature detecting means, which is immersed in the water-soluble cutting liquid stored in the liquid storage tank and detects the measured liquid temperature Tg of the water-soluble cutting liquid stored in the liquid storage tank, and the liquid temperature detecting means. The concentration is different from the conductivity detecting means that is installed and immersed in the water-soluble cutting liquid stored in the liquid storage tank and detects the measured electrical conductivity σg of the water-soluble cutting liquid stored in the liquid storage tank. A water-soluble cutting liquid having the same composition as the water-soluble cutting liquid stored in the liquid storage tank and having a plurality of concentration data, and having each concentration corresponding to each concentration data, has a water-soluble cutting liquid having each concentration. A storage means for storing a linear function formula indicating the relationship between the liquid temperature and the electric conductivity of the water-soluble cutting liquid, the measured liquid temperature Tg detected by the liquid temperature detecting means, and the detection of the conductivity detecting means. It is provided with an arithmetic control means for simultaneously inputting the actual measured electric conductivity σg at the measured liquid temperature Tg, and the arithmetic control means includes the concentration data and the water content of each concentration. Each of the above-mentioned linear function formulas corresponding to the sex cutting liquid is read from the storage means, and based on the measured liquid temperature Tg input from the liquid temperature detecting means and the linear function formula corresponding to the water-soluble cutting liquid of each concentration. Calculation of water-soluble cutting liquid of concentration Calculates electrical conductivity σbn, and based on the respective concentration data and the calculated electrical conductivity σbn of the water-soluble cutting liquid of each concentration, the measured liquid input from the liquid temperature detecting means. A calibration line F (T) showing the relationship between the concentration of the water-soluble cutting liquid at the measured liquid temperature Tg and the measured electrical conductivity σg of the water-soluble cutting liquid at the measured liquid temperature Tg corresponding to the temperature Tg was calculated and described above. The actual measured electrical conductivity σg input from the conductivity detecting means, and the water content stored in the liquid storage tank based on the measured electrical conductivity σg at the measured liquid temperature Tg and the calculated calibration line F (T). is a machine tool system that is characterized in that calculating the concentration of the sex cutting fluid.

This onset Ming, comprising a storage unit for the corresponding to each of a plurality of liquid temperature that can be detected in the fluid temperature detecting means, for storing a calibration curve showing the relationship between the concentration and electric conductivity of the water-soluble cutting fluid, the arithmetic control unit Reads a calibration line corresponding to the liquid temperature from the storage means based on the liquid temperature input from the liquid temperature detecting means, and reads out the electric conductivity input from the conductivity detecting means and the electrical conductivity input from the storage means. on the basis of the calibration curve, a concentration detector you and calculates the concentration of the pooled water-soluble cutting fluid.

In claim 1 according to the present invention, the liquid temperature detecting means detects the liquid temperature of the stored water-soluble cutting fluid, and the conductivity detecting means detects the electric conductivity of the stored water-soluble cutting fluid. The arithmetic control means simultaneously inputs the liquid temperature detected by the liquid temperature detecting means and the electric conductivity detected by the conductivity detecting means, and the electric conduction corresponding to the liquid temperature and the liquid temperature input from the liquid temperature detecting means. Obtain the rate (electrical conductivity at liquid temperature) at the same time. The arithmetic control means is based on a calibration curve showing the relationship between the concentration of the water-soluble cutting fluid and the electric conductivity corresponding to the liquid temperature input from the liquid temperature detecting means, and the electric conductivity input from the conductivity detecting means. , Calculate the concentration of the stored water-soluble cutting fluid.
As a result, the concentration of the stored water-soluble cutting fluid at the liquid temperature can be calculated from the liquid temperature input from the liquid temperature detecting means and the electrical conductivity input from the conductivity detecting means. The concentration can be calculated accurately.

According to claim 1 of the present invention, the liquid temperature input from the liquid detection unit, the linear functions to the water-soluble cutting fluid of each concentration is calculated the electrical conductivity of the water-soluble cutting fluid of each concentration, and the density data , Calculate the calibration line corresponding to the liquid temperature input from the liquid temperature detecting means from the electric conductivity of the water-soluble cutting liquid of each concentration, and from the electric conductivity input from the conductivity detecting means and the calculated calibration line. , The concentration of the stored water-soluble cutting liquid can be calculated.
According to claim 1, before the detection of the stored water-soluble cutting fluid, the liquid temperature detecting means is a reservoir with water-soluble cutting fluid of the same component, the water-soluble cutting liquid per each concentration corresponding to each density data detects the actual measured before the liquid temperature (sample liquid temperature), the conductivity detecting means, wherein each water-soluble cutting fluid of each concentration, detects the actually measured before electrical conductivity (sample electrical conductivity), the arithmetic control unit (Control means) inputs the pre-measurement liquid temperature detected by the liquid temperature detecting means and the pre-measured electrical conductivity detected by the conductivity detecting means for each water-soluble cutting liquid of each concentration at regular time intervals. Then, a plurality of liquid temperatures having different temperatures and electrical conductivity corresponding to each liquid temperature were acquired, and each of the water-soluble cutting liquids having each concentration was input from the liquid temperature detecting means and the conductivity detecting means. A linear functional formula showing the relationship between the pre-measurement liquid temperature and the pre-measurement electrical conductivity of the water-soluble cutting liquid corresponding to each concentration of the water-soluble cutting liquid based on each pre-measurement liquid temperature and each pre-measurement electrical conductivity. It is also possible to adopt a configuration in which the linear function formula corresponding to the calculated water-soluble cutting liquid of each concentration is stored in the storage means.
Before detecting the liquid temperature (measured liquid temperature) and electrical conductivity (measured electrical conductivity) of the stored water-soluble cutting fluid, each component is the same as the stored water-soluble cutting fluid and corresponds to each concentration data. Multiple pre-measurement liquid temperatures with different temperatures for each water-soluble cutting fluid of concentration, and pre-measurement electrical conductivity corresponding to each pre-measurement liquid temperature (pre-measurement electrical conductivity at each pre-measurement liquid temperature) ), And the linear function formula for each concentration of water-soluble cutting fluid can be calculated.

In this onset bright, the arithmetic control unit, based on the liquid temperature input from the liquid temperature detection unit, reads the calibration curve corresponding to the liquid temperature from the storage means, and the read calibration curve, the input from the conductivity sensor means The concentration of the stored water-soluble cutting fluid can be calculated based on the electric conductivity.
In this onset bright, the plurality of temperature detection can temperature range of the liquid temperature detecting means, corresponding to the respective temperature, a calibration curve showing the concentration and the electrical conductivity relationship of the water-soluble cutting fluid (calibration formula for a linear function A configuration including a storage means for storing) can also be adopted.

In claim 2 of the present invention, the liquid temperature detecting means detects the liquid temperature of the water-soluble cutting fluid stored in the liquid storage tank, and the conductivity detecting means is the electricity of the water-soluble cutting fluid stored in the liquid storage tank. Detect conductivity. The arithmetic control means simultaneously inputs the liquid temperature detected by the liquid temperature detecting means and the electric conductivity detected by the conductivity detecting means, and the electric conduction corresponding to the liquid temperature and the liquid temperature input from the liquid temperature detecting means. Obtain the rate (electrical conductivity at liquid temperature) at the same time. The arithmetic control means is based on a calibration curve showing the relationship between the concentration of the water-soluble cutting fluid and the electric conductivity corresponding to the liquid temperature input from the liquid temperature detecting means and the electric conductivity input from the conductivity detecting means. , Calculate the concentration of the stored water-soluble cutting fluid.
As a result, the concentration of the water-soluble cutting fluid stored in the liquid storage tank at the liquid temperature can be calculated from the liquid temperature input from the liquid temperature detecting means and the electrical conductivity input from the conductivity detecting means, and the water content can be calculated. The concentration of the cutting fluid can be calculated accurately.

It is a front view which shows the machine tool of the machine tool system, and the density detection apparatus of 1st and 2nd Embodiment. It is the AA arrow view of FIG. FIG. 2 is a cross-sectional view taken along the line BB of FIG. FIG. 2 is a cross-sectional view taken along the line CC of FIG. FIG. 2 is a cross-sectional view taken along the line DD of FIG. FIG. 2 is a cross-sectional view taken along the line EE of FIG. It is a block diagram which shows the density | concentration detection apparatus of 1st and 2nd Embodiment. It is a graph figure of the linear function expression which shows the relationship between the liquid temperature before the measurement of the water-soluble cutting fluid and the electric conductivity before the measurement of the water-soluble cutting fluid with respect to the water-soluble cutting fluid of each concentration. It is a graph of the calibration curve (calibration formula of a linear function) which shows the relationship between the concentration of the water-soluble cutting fluid and the calculated electric conductivity of the water-soluble cutting fluid with respect to the liquid temperature input from the liquid temperature detecting means. It is a flowchart (the 1) which shows the actual measurement process 1 executed by the density | concentration detection apparatus of 1st Embodiment. It is a flowchart (the 2) which shows the actual measurement process 1 executed by the density | concentration detection apparatus of 1st Embodiment. FIG. 3 is a flowchart (No. 3) showing an actual measurement process 1 executed by the concentration detection device of the first embodiment. It is a flowchart (the 1) which shows the actual measurement process 2 executed by the density | concentration detection apparatus of 2nd Embodiment. It is a flowchart (the 2) which shows the actual measurement process 2 executed by the density | concentration detection apparatus of 2nd Embodiment.

The machine tool system according to the present invention and the concentration detecting devices of the first and second embodiments will be described with reference to FIGS. 1 to 14.
Hereinafter, an example in which the concentration detection devices of the first and second embodiments are applied to a machine tool system will be described.

<Machine system X>
In FIGS. 1 to 7, the machine tool system X includes a machine tool Y and a density detection device Z.

<Machine Y>
In FIG. 1, the machine tool Y is, for example, a machining center (hereinafter referred to as “machining center Y”). The machine tool Y may be a lathe, a milling machine, an NC lathe (numerical control lathe), a grinding machine, and an NC grinding machine (numerical control grinding machine).

The machining center Y (machine tool) is a numerically controlled milling machine that processes the workpiece 1.
As shown in FIG. 1, the machining center Y includes a spindle head 2, a spindle 3, a blade tool 4, and a tool holder 5.

In the machining center Y, the spindle head 2 is movably arranged in the vertical direction A (feeding direction) as shown in FIG.
As shown in FIG. 1, the spindle 3 is rotatably arranged on the spindle head 2. The spindle 3 is connected to the drive motor 9 and is rotated by the drive of the drive motor 9.

The blade tool 4 is a carbide drill, a carbide end mill, or the like.

As shown in FIG. 1, the tool holder 5 includes a holder body 7 and a housing 8. The holder body 7 is fitted onto the spindle 3 so that the axis coincides with the axis of the spindle 3. The holder body 7 is fixed to the spindle head 2.
The housing 8 is rotatably fitted onto the holder body 7 and held by the holder body 7. The housing 8 is connected to the spindle 3 so that the axis coincides with the axis of the spindle 3.
As a result, the tool holder 5 (holder body 7 and housing 8) is moved in the vertical direction A (feeding direction) as the spindle head 2 moves.
Further, in the tool holder 5, the housing 8 is rotated with the rotation of the spindle 3.

The housing 8 has a collet 10. The collet 10 has a chuck mechanism (not shown) for gripping the blade tool 4 (carbide drill, carbide end mill, etc.).

As shown in FIG. 1, the tool holder 5 mounts the blade tool 4 in the collet 10 and fixes the blade tool 4 with the collet 10.
As a result, the blade tool 4 (carbide drill) is fixed to the collet 10 (housing 8) and rotates as the housing 8 (spindle 3) rotates. The blade tool 4 is moved in the vertical direction A (feeding direction) as the spindle head 2 moves.

As shown in FIG. 1, the machining center Y (machine tool Y) includes a plurality of injection nozzles 23 and 24, a processing table 25, a liquid storage tank 26, a liquid supply pipe 27, and a pump 28.

As shown in FIG. 1, the injection nozzles 23 and 24 are located outside the blade tool 4 (carbide drill, carbide end mill, etc.) and are arranged to face the blade tool 4. The injection nozzles 23 and 24 are connected to the nozzle tubes 23A and 24A. The nozzle tubes 23A and 24A are fixed to the spindle head 2.
As a result, the injection nozzles 23 and 24 are moved in the vertical direction A (feeding direction) as the spindle head 2 moves.

As shown in FIG. 1, the machining table 25 is arranged on the lower side of the blade tool 4 (each injection nozzle 23, 24) at intervals in the vertical direction A. The machining table 25 is installed facing the blade tool 4.
The processing table 25 has a vise (not shown) for fixing the workpiece 1.

As shown in FIGS. 1 to 6, the liquid storage tank 26 stores the water-soluble cutting fluid (water-soluble cutting oil) WO.
The water-soluble cutting fluid WO is an alkaline liquid, which is a water-soluble cutting fluid having a concentration α obtained by diluting the water-soluble cutting stock solution with water. The water-soluble cutting fluid (water-soluble cutting fluid WO) is, for example, a component such as a rust preventive additive (containing an alkaline component), a surfactant, a refined mineral oil (containing a sulfide), other components, and water. Become.
The concentration of the water-soluble cutting liquid means a volume concentration (volume concentration) or a weight concentration (mass concentration) in relation to the water-soluble cutting stock solution and the water for diluting the water-soluble cutting stock solution (hereinafter, the same applies).

The liquid storage tank 26 has front and rear wall plates 26A and 26B, left and right wall plates 26C and 26D, and a bottom wall plate 26E, and is formed in a rectangular parallelepiped by the wall plates 26A to 26E.
The liquid storage tank 26 has a storage space 21 partitioned by wall plates 26A to 26E, and the storage space 21 is opened upward.

As shown in FIGS. 1 and 2, the liquid storage tank 26 has a partition plate 29 and front and rear lid plates 30 and 31.
In the liquid storage tank 26, the partition plate 29 is arranged in the storage space 21. The partition plate 29 is arranged so as to be located on the front wall plate 26A side of the liquid storage tank 26. The partition plate 29 is arranged in parallel with the front wall plate 26A at intervals in the front-rear direction B, and is erected and fixed to the bottom wall plate 26E. The partition plate 29 is attached to the right wall plate 26D of the liquid storage tank 26 and extends to the left wall plate 26C side in the left-right direction C. As shown in FIG. 2, the partition plate 29 is arranged so as to form a gap δ in the left wall plate 26C in the left-right direction C.

In the liquid storage tank 26, the front lid plate 30 is arranged on the front side of the liquid storage tank 26 as shown in FIGS. 1 and 2. The front lid plate 30 is arranged so as to extend between the front wall plate 26A and the partition wall plate 29 in the front-rear direction B. The front lid plate 30 is arranged so as to extend between the left wall plate 26C and the right wall plate 26D in the left-right direction C. The front lid plate 30 covers the front side (a part of the storage space 21) of the storage space 21 and is placed on the front wall plate 26A, the partition wall plate 29, and the left and right wall plates 26C and 26D. The front lid plate 30 is attached to the front wall plate 26A, the partition wall plate 29, and the left and right wall plates 26C, 26D of the liquid storage tank 26. As shown in FIGS. 1 and 2, the front lid plate 30 has a liquid recovery port 32, and the liquid recovery port 32 is formed on the right wall plate 26D side in the left-right direction C. The liquid recovery port 32 penetrates the front lid plate 30 in the vertical direction A and communicates with the storage space 21 to the outside.

In the liquid storage tank 26, the rear lid plate 31 is arranged on the rear side of the liquid storage tank 26 as shown in FIGS. 1 and 2. The rear lid plate 31 is arranged so as to extend between the left wall plate 26C and the right wall plate 26D in the left-right direction C. The rear lid plate 31 covers the rear side (a part of the storage space 21) of the storage space 21 and is placed on the rear wall plate 26B and on the left and right wall plates 26C and 26D. The rear lid plate 31 is attached to the rear wall plate 26B of the liquid storage tank 26 and the left and right wall plates 26C and 26D.
As a result, in the liquid storage tank 26, the storage space 21 is opened upward between the front lid plate 30 and the rear lid plate 31.

As shown in FIG. 1, the liquid storage tank 26 is arranged below the processing table 25 (workpiece 1). The liquid storage tank 26 is arranged so that the liquid recovery port 32 faces the processing table 25 (workpiece 1). The liquid storage tank 26 is installed on the processing table 25 at intervals in the vertical direction A.

As shown in FIG. 1, the liquid supply pipe 27 is arranged between the injection nozzles 23 and 24 and the pump 28. One end of the liquid supply pipe 27 is connected to the pump 28. The other end of the liquid supply pipe 27 is connected to the nozzle pipe 24A of the injection nozzle 24. The liquid supply pipe 27 is connected to the nozzle pipe 23A of the injection nozzle 23.
As a result, the liquid supply pipe 27 communicates with the injection nozzles 23 and 24 and the pump 28.

The pump 28 (electric pump) is arranged in the liquid storage tank 26 as shown in FIGS. 1, 2 and 6. As shown in FIGS. 2 and 6, the pump 28 is arranged on the left wall plate 26C side in the left-right direction C. The pump 28 is placed on the rear lid plate 31 of the liquid storage tank 26 and attached to the rear lid plate 31. The pump 28 is immersed in the water-soluble cutting fluid WO of the storage space 21. The pump 28 is connected to one end of the liquid supply pipe 27. The pump 28 communicates with the injection nozzles 23 and 24 through the liquid supply pipe 27 and the nozzle pipes 23A and 24A.
The pump 28 is connected to a control means (not shown) of the machining center Y (machine tool), and is suction / discharge driven based on a drive command (drive signal) of the control means.
The pump 28 sucks the water-soluble cutting fluid WO stored in the liquid storage tank 26 and discharges the water-soluble cutting fluid WO to the liquid supply pipe 27 based on the drive command of the control means of the machining center Y.
As a result, each of the injection nozzles 23 and 24 injects the water-soluble cutting fluid WO onto the blade tool 4 and the workpiece 1 as shown in FIG.
The water-soluble cutting fluid WO injected from the injection nozzles 23 and 24 flows into the liquid storage tank 26 from the processing table 25 through the liquid recovery port 32 and is recovered.
As shown in FIG. 2, the water-soluble cutting fluid WO collected in the liquid storage tank 26 is guided by the front wall plate 26A and the partition plate 29 and flows from the liquid recovery port 32 to the left wall plate 26C, and flows to the left wall plate 26C. The liquid flows out from the gap δ between the 26C and the partition plate 29 to the pump 28 side of the storage space 21.

<Concentration detection device Z (liquid state measuring device) of the first embodiment>
As shown in FIGS. 1 to 7, the concentration detecting device Z of the first embodiment is a liquid state detecting device for detecting the liquid state of the water-soluble cutting fluid WO stored in the liquid storage tank 26, and is a liquid storage tank. The concentration of the water-soluble cutting fluid WO stored in 26 is calculated (calculated).
The concentration measuring device Z of the first embodiment detects the sulfide gas concentration (odor) of the water-soluble cutting fluid WO stored in the liquid storage tank 26 and the hydrogen ion concentration index (pH) of the water-soluble cutting fluid WO.

As shown in FIGS. 1 to 5 and 7, the concentration measuring device Z of the first embodiment includes a liquid temperature detecting means 51, a conductivity detecting means 52, an odor detecting means 53, and a hydrogen ion concentration index detecting means 54. The arithmetic control means 55 and the storage means 56 are provided.

The liquid temperature detecting means 51 detects the liquid temperature Tg (° C.) of the stored water-soluble cutting fluid WO. The liquid temperature detecting means 51 is a contact type temperature sensor (thermocouple, platinum measurement resistor, thermistor).
As shown in FIGS. 1 to 5, the liquid temperature detecting means 51 is arranged on the rear lid plate 31 of the liquid storage tank 26. The liquid temperature detecting means 51 is arranged on the right wall plate 26D side at intervals from the pump 28 in the left-right direction C.
The liquid temperature detecting means 51 is fixed to the rear lid plate 31 of the liquid storage tank 26 and is immersed in the water-soluble cutting fluid WO stored in the liquid storage tank 26.
The liquid temperature detecting means 51 detects the liquid temperature Tg of the water-soluble cutting fluid WO stored in the liquid storage tank 26 [hereinafter referred to as “measured liquid temperature Tg (° C.)”] and outputs it as a measured liquid temperature signal.
The liquid temperature detecting means 51 may be a non-contact temperature sensor (radiation thermometer, thermography). The non-contact temperature sensor is arranged facing the water-soluble cutting fluid WO from the opening of the liquid storage tank 26 (storage space 21).

The conductivity detecting means 52 detects the electric conductivity σg (microsiemens per centimeter: μS / cm) of the stored water-soluble cutting fluid WO. The conductivity detecting means 52 is a conductivity sensor [electrical conductivity sensor (two-electrode conductivity sensor or the like)]. The electrical conductivity is the conductivity.
As shown in FIGS. 1 to 5, the conductivity detecting means 52 is arranged on the rear lid plate 31 of the liquid storage tank 26. The conductivity detecting means 52 is arranged on the right wall plate 26D side at intervals from the pump 28 in the left-right direction C.
As shown in FIGS. 1 to 5, the conductivity detecting means 52 is arranged side by side with the liquid temperature detecting means 51 in the front-rear direction B, and is arranged between the liquid temperature detecting means 51 and the rear wall plate 26B.
The conductivity detecting means 52 is fixed to the rear lid plate 31 of the liquid storage tank 26 and is immersed in the water-soluble cutting fluid WO stored in the liquid storage tank 26.
The conductivity detecting means 52 detects the electric conductivity σg of the water-soluble cutting fluid WO (alkaline ion) stored in the liquid storage tank 26 [hereinafter, referred to as “measured electric conductivity σg (μS / cm)”]. Output as an actually measured electrical conductivity signal.

The odor detecting means 53 detects the sulfide gas concentration γg generated by the stored water-soluble cutting fluid WO. The odor detecting means 53 includes a gas sensor (semiconductor type gas sensor, organic semiconductor type gas sensor, crystal pendulum type gas sensor, fixed electrolyte gas sensor, etc.).
The odor detecting means 53 is arranged on the rear lid plate 31 of the liquid storage tank 26 as shown in FIGS. 1, 2 and 5. The odor detecting means 53 is arranged on the right wall plate 26D side at intervals from the pump 28 in the left-right direction C.
The odor detecting means 53 is juxtaposed with the liquid temperature detecting means 51 on the front wall plate 26A side at intervals in the front-rear direction B, and is fixed to the rear lid plate 31 of the liquid storage tank 26.
The odor detecting means 53 detects the sulfide gas concentration γg generated by the water-soluble cutting fluid WO stored in the liquid storage tank 26 and outputs it as a sulfide gas concentration signal.

The hydrogen ion concentration index detecting means 54 detects the hydrogen ion concentration index εg (pH) of the stored water-soluble cutting fluid WO (hereinafter, referred to as “pH detecting means 54”). The pH detecting means 54 is a pH sensor.
As shown in FIGS. 2 and 6, the pH detecting means 54 is arranged on the rear lid plate 31 of the liquid storage tank 26. The pH detecting means 54 is arranged on the right wall plate 26D side at intervals from the pump 28 in the left-right direction C.
The pH detecting means 54 is arranged side by side with the odor detecting means 53 at intervals in the left-right direction C. The pH detecting means 54 is fixed to the rear lid plate 31 of the liquid storage tank 26 and is immersed in the water-soluble cutting fluid WO stored in the liquid storage tank 26.
The pH detecting means 54 detects the hydrogen ion concentration index εg of the water-soluble cutting fluid WO stored in the liquid storage tank 26 and outputs it as a hydrogen ion concentration index signal.

As shown in FIG. 7, the arithmetic control means 55 is connected to the liquid temperature detecting means 51, the conductivity detecting means 52, the odor detecting means 53, and the pH detecting means 54.
The arithmetic control means 55 includes a measured liquid temperature Tg (measured liquid temperature signal) detected by the liquid temperature detecting means 51, a measured electric conductivity σg (measured electric conductivity signal) detected by the conductivity detecting means 52, and an odor detecting means 53. The detected sulfide gas concentration γg (sulfide gas concentration signal) and the hydrogen gas concentration index εg (hydrogen ion concentration index signal) detected by the pH detecting means 54 are simultaneously input.

As shown in FIG. 7, the arithmetic control means 55 includes a controller 57, an amplifier 58, and a timer 59 (timekeeping device).
The amplifier 58 is connected to the conductivity detecting means 52. The amplifier 58 inputs the measured electric conductivity σg (measured electric conductivity signal) detected by the conductivity detecting means 52, and amplifies the measured electric conductivity σg (measured electric conductivity signal) (for example, the measured electric conductivity signal). Is amplified 4 times) and output.

The controller 57 is, for example, a CPU (Central Processing Unit) and is connected to an amplifier 58 and a timer 59.
The controller 57 inputs the measured electrical conductivity σg (μS / cm) amplified by the amplifier 58. The controller 57 outputs a detection signal to the timer 59. The timer 59 measures the detection time t by inputting the detection signal.

The storage means 56 stores a plurality of concentration data αa1, αa2, ..., αan having different concentrations (however, n = 1,2,3, ..., i, ..., n: natural numbers. The same applies hereinafter. ).
The concentration data αa1, αa2, ..., Αan are, for example, values in the range of 2% to 10%.

The storage means 56 stores the concentration determination range value αx. The concentration discrimination range value αx is a range value indicating the concentration of the water-soluble cutting fluid WO, and is a value that takes a range value from the minimum concentration value αmin to the maximum concentration value αmax. In the concentration discrimination range value αx, the minimum concentration value αmin is, for example, a concentration of 3%, and the maximum concentration value αmax is, for example, a concentration of 7%.

The storage means 56 stores the odor discrimination value γx. The odor discrimination value γx is a value indicating the sulfide gas concentration.

The storage means 56 stores the hydrogen gas concentration index discrimination value εx. The hydrogen gas concentration index discrimination value εx is a value indicating the hydrogen gas concentration index of the water-soluble cutting fluid WO. The hydrogen gas concentration index discrimination value εx is, for example, εx = 8.9.

The storage means 56 has the same components as the water-soluble cutting fluid WO stored in the liquid storage tank 26, and the water-soluble cutting of the respective concentrations α1, α2, ..., αn corresponding to the respective concentration data αa1, αa2 ..., αan. For the liquids WO1, WO2, ..., Won, the linear function equations f1, f2, ... Fn corresponding to the water-soluble cutting fluids WO1, WO2, ..., Won having the respective concentrations α1, α2, ..., αn are stored.
As shown in FIG. 8, the linear function equations f1, f2, ..., Fn corresponding to the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations α1, α2, ..., αn are before the actual measurement of the water-soluble cutting fluid. It is a functional formula showing the relationship between the liquid temperature (° C.) and the electrical conductivity before actual measurement (μS / cm).
The linear function formulas f1, f2, ..., F3 corresponding to the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations α1, α2, ... And the linear function formulas f1, f2, ..., Fn of each concentration α1, α2, ..., αn water-soluble cutting fluid WO1, WO2, ... Is.
Each concentration α1, α2, ..., αn has the same concentration as each concentration data αa1, αa2, ..., αan, and has a relationship of α1 = αa1, α2 = αa2, ..., αn = αan. Each of the concentrations α1, α2, ..., αn is, for example, a value in the range of 2% to 10%.

The concentration detection device Z is a linear function formula corresponding to the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations a1, a2, ..., An before the detection of the water-soluble cutting fluid WO stored in the liquid storage tank 26. f1, f2, ..., Fn: f (i) = y (αi%) = Ax + B is calculated.

<Calculation of linear function formulas f1, f2, ..., Fn>
In the concentration detecting device Z, the liquid temperature detecting means 51 uses the liquid temperature (° C.) of the water-soluble cutting fluid (° C.) for each of the water-soluble cutting fluids WO1, WO2, ... "Pre-measurement liquid temperature (sample liquid temperature)"] is detected.
The conductivity detecting means 52 has an electric conductivity (μS / cm) of the water-soluble cutting fluid (μS / cm) for each of the water-soluble cutting fluids WO1, WO2, ... Liquid temperature (sample electrical conductivity) "] is detected.
The arithmetic control means 55 (controller 57) keeps the pre-measurement liquid temperature (° C.) detected by the liquid temperature detecting means 51 and the pre-measurement electrical conductivity (μS / cm) detected by the conductivity detecting means 52 constant. Input for each detection time (for example, every minute) to acquire a plurality (many) pre-measurement liquid temperatures T having different temperatures and a plurality (many) pre-measurement electrical conductivity.
As a result, the arithmetic control means 55 has a plurality (many) pre-measurement liquid temperatures and a plurality (many) actual measurements for each of the water-soluble cutting fluids WO1, WO2, ..., WOn having concentrations α1, α2, ..., αn. Obtain the pre-electrical conductivity. The pre-measurement electrical conductivity is the electrical conductivity corresponding to each pre-measurement liquid temperature (pre-measurement electrical conductivity at each pre-measurement liquid temperature).
In the water-soluble cutting fluid WO1 having a concentration of α1, a plurality of (many) pre-measurement liquid temperatures T11, T12, ..., T1n, and a plurality (many) pre-measurement electrical conductivity σ11, σ12, ..., Σ1n were obtained, and the concentration α2 was obtained. In the water-soluble cutting fluid WO2 of the above, a plurality (many) pre-measurement liquid temperatures T21, T22, ..., T2n, and a plurality (many) pre-measurement electrical conductivity σ21, σ22, ..., Σ2n are obtained. In the water-soluble cutting fluid WOn having a concentration of αn, a plurality of (many) pre-measurement liquid temperatures Tn1, Tn2, ..., Tnn, and a plurality (many) pre-measurement electrical conductivity σn1, σn2, ..., Σnn are obtained.

The arithmetic control means 55 is a water-soluble cutting fluid WO1, WO2, ..., Each concentration α1, α2, ..., αn, and a water-soluble cutting fluid WO1, WO2, ... The linear function equations f1, f2, ... Fn corresponding to WOn are calculated.
FIG. 8 shows the “pre-measurement liquid temperature (° C.) of the water-soluble cutting fluid” and the “water-soluble cutting fluid” corresponding to the water-soluble cutting fluids WO1, WO2,…, WOn having the respective concentrations α1, α2,…, αn. It is a graph of the linear function equations f1, f2, ..., Fn showing the relationship of "electrical conductivity before actual measurement (μS / cm)".
In FIG. 8, the horizontal axis (x coordinate axis) is the “pre-measurement liquid temperature (° C.)”, and the vertical axis (y coordinate axis) is the “pre-measurement electrical conductivity (μS / cm)”.
In FIG. 8, the “pre-measurement liquid temperature (liquid temperature)” is defined as the “x coordinate value (xi)”, and the “pre-measurement electrical conductivity (electrical conductivity)” is defined as the “y coordinate value (yi)”. In FIG. 8, the coordinate values are (x, y) = (liquid temperature before actual measurement, electrical conductivity before actual measurement).
In the water-soluble cutting fluid WO1 having a concentration of α1, the number of coordinate value data M is M = n, and each coordinate value is (x1, y1) = (T11, σ11), (x2, y2) = (T12, σ12), ..., (Xn, xn) = (T1n, σ1n), and in the water-soluble cutting fluid WOn having a concentration of αn, the number of coordinate value data is M = n, and each coordinate value is (x1, y1) = (Tn1, σn1). ), (X2, y2) = (Tn2, σn2), ..., (Xn, xn) = (Tnn, σnn).
The arithmetic control means 55 (controller 57) uses, for example, the “least squares method” and uses a linear function expression f corresponding to the water-soluble cutting fluids WO1, WO2,…, and WOn having the respective concentrations α1, α2, ..., αn. (I) = y (αi) = Ax + B is calculated.
According to the "least squares method", the number of coordinate value data related to "pre-measurement liquid temperature-pre-measurement electrical conductivity" M = n, i-th coordinate value (xi, yi) = (pre-measurement liquid temperature, pre-measurement electricity) (Conductivity), the "A value (slope)" of the linear function equation f (i) = y (αi) = Ax + B is calculated by the equation (1).
The "B value (intercept)" of the linear function f (i) = y (αi) = Ax + B is calculated by the equation (2).

The arithmetic control means 55 has a number of coordinate value data M = n and each coordinate value (xi, yi) = (before actual measurement) for each of the water-soluble cutting fluids WO1, WO2, ... WOn having concentrations α1, α2, ..., αn. Liquid temperature, electrical conductivity before actual measurement) is substituted into equations (1) and (2), and a linear function corresponding to the water-soluble cutting fluids WO1, WO2, ... The "A value (slope)" and "B value" of the formula f (i) = y (αi) = Ax + B are calculated.
The arithmetic control means 55 stores the linear function expressions f1, f2, ..., Fn corresponding to the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations α1, α2, ..., αn in the storage means 56.

In the detection of the water-soluble cutting fluid WO stored in the liquid storage tank 26, the arithmetic control means 55 (controller 57) corresponds to the measured liquid temperature Tg (° C.) input from the liquid temperature detecting means 51, "water-soluble cutting". A calibration curve F (Tg) showing the relationship between the “liquid concentration α” and the “calculated electrical conductivity (μS / cm)” is calculated.
The calibration curve F (Tg) is, for example, a linear function calibration formula F (Tg) = y (Tg) = Ax + B.

<Calculation of calibration curve F (Tg)>
The arithmetic control means 55 (controller 57) corresponds to the measured liquid temperature Tg (° C.) input from the liquid temperature detecting means 51 and the water-soluble cutting fluids WO1, WO2, ... WOn having the respective concentrations α1, α2, ..., αn. Based on the linear function equations f1, f2, ..., Fn, the electrical conductivity of the water-soluble cutting fluids WO1, WO2, ... ) Is calculated.
The arithmetic control means 55 (controller 57) uses the measured liquid temperature Tg (° C.) input from the liquid temperature detecting means 51 as a linear function expression f1, f2, ..., Fn of each water-soluble cutting fluid WO1, WO2, ... WOn. By substituting into "x (x coordinate value)" of, the water-soluble cutting fluids WO1, WO2, ..., WOn of each concentration α1, α2, ..., αn are calculated. ..
The arithmetic control means 55 (controller 57) calculates electric conductivity σb1 of each concentration data αa1, αa2, ..., αan and water-soluble cutting fluids WO1, WO2, ..., WOn of each concentration α1, α2, ..., αn. , Σb2, ..., σbn, and calculate the calibration curve F (T) [calibration method F (T) of the linear function] corresponding to the measured liquid temperature Tg (° C.) input from the liquid temperature detecting means 51. ..
FIG. 9 shows the relationship between the “concentration of the water-soluble cutting fluid” and the “calculated electrical conductivity (μS / cm) of the water-soluble cutting fluid” corresponding to the measured liquid temperature Tg (° C.) input from the liquid temperature detecting means 51. It is a graph of the calibration curve F (Tg) [calibration formula F (Tg) of the linear function] which shows.
In FIG. 9, the horizontal axis (x coordinate axis) is the “calculated electrical conductivity of the water-soluble cutting fluid”, and the vertical axis (y coordinate axis) is the “concentration of the water-soluble cutting fluid”.
In FIG. 9, the "calculated electric conductivity (electrical conductivity) of the water-soluble cutting fluid" is defined as the "x coordinate value", and the "concentration of the water-soluble cutting fluid" is defined as the "y coordinate value". In FIG. 9, each coordinate value is (xi, yi) = (calculated electrical conductivity, concentration).
Water-soluble cutting fluids WO1, WO2, ..., WOn of each concentration α1, α2, ..., αn Calculation of electrical conductivity σb1, σb2, ... The number of coordinate value data related to "calculated electrical conductivity" M = n, and each coordinate value is (x1, y1) = (σb1, αa1), (x2, y2) = (σb2, αa2), ..., (Xn, yn) = (Σbn, αan).
The arithmetic control means 55 (controller 57) calculates the calibration curve F (Tg) = y (Tg) = Ax + B of the linear function by using, for example, the “least squares method”.
The arithmetic control means 55 has coordinate value data number M = n regarding "concentration-calculated electrical conductivity", each coordinate value (x1, y1) = (σb1, αa1), (x2, y2) = (σb2, αa2), ..., (Xn, yn) = (σbn, αan) is substituted into the equation (1) to calculate the “A value (slope)” of the calibration curve F (Tg) = y (Tg) = Ax + B.
The arithmetic control means 55 (controller 57) has a number of coordinate value data M = n, each coordinate value (x1, y1) = (σb1, αa1), (x2, y2) = (σb2, αa2), ..., (Xn). , Yn) = (σbn, αan) is substituted into the equation (2) to calculate the “B value (intercept)” of the calibration curve F (Tg) = y (Tg) = Ax + B.

As a result, the calibration curve F (Tg) corresponding to the measured liquid temperature (Tg) input from the liquid temperature detecting means 51 becomes
y (Tg) = Ax + B ... Equation (3)
Will be.
In the formula (3), y (Tg) is the concentration α of the water-soluble cutting fluid WO at the measured liquid temperature (Tg), and x is the pre-measurement electrical conduction of the water-soluble cutting fluid WO at the measured liquid temperature (Tg). The rate (μS / cm).

The arithmetic control means 55 (controller 57) has a calibration curve F (Tg) corresponding to the measured electrical conductivity σg (μS / cm) input (acquired) from the conductivity detecting means 52 and the measured liquid temperature Tg (° C.). Based on the above, the concentration α of the water-soluble cutting fluid WO stored in the liquid storage tank 26 is calculated.

The arithmetic control means 55 (controller 57) substitutes the measured electrical conductivity σg (μS / cm) input (acquired) from the conductivity detection means 52 into the “x (x coordinate value)” of the equation (3). Then, the concentration α of the water-soluble cutting fluid WO stored in the liquid storage tank 26 is calculated.

As shown in FIG. 7, the concentration detecting device Z of the first embodiment includes a display means 65 and an alarm means 66.

The display means 65 is, for example, a liquid crystal display. The display means 65 is connected to the controller 57.
The alarm means 66 is an alarm device that issues an alarm such as an alarm sound, and is connected to the controller 57.

In the machine tool system X, the machine tool Y processes the workpiece 1, and the concentration detection device Z of the first embodiment detects the water-soluble cutting fluid WO stored in the liquid storage tank 26 in FIGS. The actual measurement process 1 shown in FIG. 12 is executed to detect the liquid state of the water-soluble cutting fluid WO (water-soluble cutting fluid WO whose concentration α is unknown) stored in the liquid storage tank 26, and the water-soluble cutting fluid WO Calculate the concentration α.
Hereinafter, processing of the workpiece 1 in the machine tool Y and actual measurement processing 1 of the concentration detection device Z of the first embodiment will be described with reference to FIGS. 1 to 12.

As shown in FIG. 1, the machine tool Y (control means) drives the pump 28 by suction / discharge. The pump 28 sucks the water-soluble cutting fluid WO stored in the liquid storage tank 26 along with the suction / discharge drive, and discharges the water-soluble cutting fluid WO to the liquid supply pipe 27.
As a result, the water-soluble cutting fluid WO discharged to the liquid supply pipe 27 is injected from the injection nozzles 23 and 24 to the blade tool 4 and the workpiece 1 through the liquid supply pipe 27 and the nozzle pipes 23A and 24A. Will be supplied).

The machine tool Y drives the drive motor 9, rotates the blade tool 4 (housing 8, collet 10), moves the spindle head 2, and sends the blade tool 4 to the workpiece 1.
As a result, the machine tool Y processes the workpiece 1 with the blade tool 4 while supplying the water-soluble cutting fluid WO stored in the liquid storage tank 26 to the blade tool 4 and the workpiece 1.
As shown in FIG. 1, the water-soluble cutting fluid WO injected (supplied) to the blade tool 4 and the workpiece 1 is collected from the processing table 25 through the liquid recovery port 32 into the liquid storage tank 26 (storage space 21). NS.
In this way, the machine tool Y processes the workpiece 1 with the blade tool 4 while circulating the water-soluble cutting fluid WO between the blade tool 4 (workpiece 1) and the liquid storage tank 26.

<Actual measurement processing 1>
In the detection of the water-soluble cutting fluid WO stored in the liquid storage tank 26, the controller 57 (calculation control means 55) detects the timer 59 when the machine tool Y starts processing (circulation of the water-soluble cutting fluid WO). “Zero set (t → 0)” t (Fig. 10: ST01).

Subsequently, the controller 57 outputs a detection signal to the timer 59. When the detection signal is input, the timer 59 measures the detection time t.
When the detection time t of the timer 59 reaches the time tk (detection time t = tk) (FIG. 10: ST02, Yes), the controller 57 detects the measured liquid temperature Tg (° C.) and the conductivity of the liquid temperature detecting means 51. The measured electrical conductivity σg (μS / cm) detected by the rate detecting means 52 is simultaneously input (acquired) (FIG. 10: ST03).
The measured electrical conductivity σg input by the controller 57 is the electrical conductivity [electrical conductivity at the measured liquid temperature Tg (° C.)] corresponding to the measured liquid temperature Tg (° C.).
Further, the controller 57 simultaneously inputs the sulfide gas concentration γg detected by the odor detecting means 53 and the hydrogen ion concentration index εg detected by the pH detecting means 54 (FIG. 10: ST03).
On the other hand, the controller 57 continues the time counting of the timer 59 unless the detection time t is the time tk (FIG. 10: ST02, No) and the detection is not completed (FIG. 10: ST16, No).
When the detection is completed (FIG. 10: ST16, Yes), the controller 57 ends the detection of the measured liquid temperature Tg, the measured electrical conductivity Tg, the sulfide gas concentration γg, and the hydrogen ion concentration index εg, and is water-soluble. The calculation (calculation) of the concentration α of the cutting fluid WO is completed.

In the arithmetic control means 55, when the controller 57 inputs the measured liquid temperature Tg (° C.), the measured electrical conductivity σg (μS / cm), the sulfide gas concentration γg, and the hydrogen ion concentration index εg (FIG. 10: ST03). , Each concentration data αa1, αa2, ..., αan, and linear function equations f1, f2, ..., Fn corresponding to the water-soluble cutting fluids WO1, WO2, ..., WOn of each concentration α1, α2, ..., αn are stored as storage means. Read from 56 (FIG. 10: ST04).

Subsequently, the controller 57 inputs (acquires) the measured liquid temperature Tg (° C.) from the liquid temperature detecting means 51, and the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations α1, α2, ..., αn. Based on the corresponding linear function equations f1, f2, ..., Fn, the calculated electrical conductivity σb (μS / cm) of each water-soluble cutting fluid WO1, WO2, ..., WOn is calculated (FIG. 10: ST05).
The controller 57 inputs (acquired) the measured liquid temperature Tg (° C.) from the liquid temperature detecting means 51 to the primary corresponding to the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations α1, α2, ..., αn. Substituting into the "x (x coordinate value)" of the function formulas f1, f2, ..., Fn: y (αi%) = Ax + B, the water-soluble cutting fluids WO1, WO2, WO3 at each concentration α1, α2, ..., αn , ..., Calculation of WOn Calculate the electrical conductivity σb (μS / cm).

In the arithmetic control means 55, the controller 57 calculates the electric conductivity of the water-soluble cutting fluids WO1, WO2, ..., WOn of the respective concentration data αa1, αa2, ..., αan, and the respective concentrations α1, α2, ..., αn. Based on σb (μS / cm), the calibration curve F (Tg) [calibration formula F (Tg) of the linear function] with respect to the measured liquid temperature Tg (° C.) is calculated (FIG. 10: ST06).
The controller 57 has a calibration curve F (Tg) corresponding to the measured liquid temperature Tg (° C.) input (acquired) from the liquid temperature detecting means 51 in the same manner as described in the above <Calculation of calibration curve F (Tg)>. Is calculated.

Subsequently, the controller 57 has the measured electrical conductivity σg (μS / cm) input (acquired) from the conductivity detecting means 52 and the calibration curve F (Tg) corresponding to the calculated measured liquid temperature Tg (° C.). Based on the above, the concentration α of the water-soluble cutting fluid WO stored in the liquid storage tank 26 is calculated (FIG. 11: ST07).
The controller 57 substitutes the actually measured electrical conductivity σg input (acquired) from the conductivity detecting means 52 into the “x (x coordinate value)” of the equation (3), and stores the water in the liquid storage tank 26. Calculate the concentration α of the cutting fluid WO.

In the arithmetic control means 55, the controller 57 uses the measured liquid temperature Tg (measured liquid temperature signal), the measured electrical conductivity σg (measured electrical conductivity signal), the calculated concentration α (concentration signal), and the sulfide gas concentration γg (measured liquid temperature signal). The sulfide gas concentration signal) and the hydrogen ion concentration index εg (hydrogen gas concentration index signal) are output to the display means 65 (FIG. 11: ST08).
As a result, the display means 65 has the measured liquid temperature Tg of the water-soluble cutting fluid WO, the measured electrical conductivity σg at the measured liquid temperature Tg, the concentration α of the water-soluble cutting fluid WO, and the sulfide gas concentration of the water-soluble cutting fluid WO. The hydrogen ion concentration index εg of γg and the water-soluble cutting fluid WO is displayed.

Subsequently, the controller 57 reads the concentration discrimination value αx from the storage means 56 (FIG. 11: ST09), and compares the concentration α of the water-soluble cutting fluid WO and the concentration discrimination value αx (αmin <α <αmax).
In the controller 57, when the concentration α of the water-soluble cutting fluid WO is outside the concentration discrimination value αx (the concentration α is less than the minimum concentration value αmin or exceeds the maximum concentration value αmax) (FIG. 11: ST10, No), an alarm is given. The signal is output to the alarm means 66 (FIG. 11: ST15).
As a result, the alarm means 66 issues an alarm such as an alarm sound.

When the concentration α of the water-soluble cutting fluid WO is within the concentration discrimination value αx (FIG. 11: ST10, Yes), the controller 57 reads the odor discrimination value γx from the storage means 56 (FIG. 11: ST11).
The controller 57 compares the sulfide gas concentration γg and the odor discrimination value γx.
When the sulfide gas concentration γg exceeds the odor discrimination value γx (FIG. 11: ST12, Yes), the controller 57 outputs an alarm signal to the alarm means 66 (FIG. 11: ST15).
As a result, the alarm means 66 issues an alarm such as an alarm sound.

If the sulfide gas concentration γg does not exceed the odor discrimination value γx (FIG. 11: ST12, No), the controller 57 reads the hydrogen ion concentration index discrimination value εx from the storage means 56 (FIG. 11: ST13).
The controller 57 compares the hydrogen ion concentration index εg and the hydrogen ion concentration index discrimination value εx.
When the hydrogen ion concentration index εg exceeds the hydrogen ion concentration index discrimination value εx (FIG. 11: ST14, Yes), the controller 57 outputs an alarm signal to the alarm means 66 (FIG. 11: ST15).
As a result, the alarm means 66 issues an alarm such as an alarm sound.

In the arithmetic control means 55, the controller 57 outputs a hydrogen ion concentration index εg that does not exceed the hydrogen ion concentration index discrimination value εx (FIG. 11: ST14, No) or outputs an alarm signal (FIG. 11 :). If ST15) and detection is not completed (FIG. 12: ST17, No), ST01 to ST16 are repeatedly executed.
As a result, the controller 57 inputs (acquires) the measured liquid temperature Tg, the measured electrical conductivity σg, the sulfide gas concentration γg, and the hydrogen ion concentration index εg every fixed detection time tk (every unit time). And the concentration α of the water-soluble cutting fluid WO is calculated every unit time.

When the detection is completed (FIG. 12: ST17, Yes), the controller 57 ends the detection of the measured liquid temperature Tg, the measured electrical conductivity Tg, the sulfide gas concentration γg, and the hydrogen ion concentration index εg, and is water-soluble. The calculation (calculation) of the concentration α of the cutting fluid WO is completed.

<Concentration detection device Z (liquid state measuring device) of the second embodiment>
The concentration detecting device Z of the second embodiment has the same as described with reference to FIGS. 1 to 7, the liquid temperature detecting means 51, the conductivity detecting means 52, the odor detecting means 53, the hydrogen ion concentration index detecting means 54, and the arithmetic control. The means 55, the storage means 56, the display means 65, and the alarm means 66 are provided.

In the concentration detecting device Z of the second embodiment, the storage means 56 has a calibration curve [calibration of a linear function] corresponding to each of a plurality of (many) liquid temperatures Tg1, Tg2, ..., Tgn that can be detected by the liquid temperature detecting means 51. Equation F (Tg)] F1, F2, ..., Fn are stored.
The plurality of liquid temperatures that can be detected by the liquid temperature detecting means 51 are a plurality of temperatures in the temperature range that can be detected by the liquid temperature detecting means 51, and the calibration curve (Fg) corresponding to each temperature is stored in the storage means 56. Remember in.
In the arithmetic control means 55, the controller 57 sets each liquid temperature Tg1, Tg2, Tg3, ..., Tgn at each concentration α1, α2, α3 in the same manner as described in the above <Calculation of calibration line F (Tg)>. , ..., αn water-soluble cutting fluid WO1, WO2, WO3, ..., By substituting the linear function equations f1, f2, ... For each Tg2, ..., Tgn, the calculated electrical conductivity σb of the water-soluble cutting fluids WO1, WO2, ..., WOn having the respective concentrations α1, α2, ..., αn is calculated.
The controller 57 has the same concentration data αa1, αa2, ..., αan and each water-soluble corresponding to each liquid temperature Tg1, Tg2, ..., Tgn, as described in the above <Calculation of calibration curve F (T)>. Based on the calculated electrical conductivity σb of the cutting fluids WO1, WO2, ..., WOn, the calibration curves F1, F2, ..., Fn [calibration formula F of the linear function] corresponding to each liquid temperature Tg1, Tg2, ..., Tg. (Tg)] is calculated.
The controller 57 stores the calibration curves F1, F2, ..., Fn corresponding to the respective liquid temperatures Tg1, Tg2, ..., Tgn in the storage means 56 before detecting the water-soluble cutting fluid WO stored in the liquid storage tank 26. do.

The concentration detecting device Z of the second embodiment executes the actual measurement process 2 shown in FIGS. 13 and 14 in detecting the water-soluble cutting fluid WO stored in the liquid storage tank 26, and the water-soluble cutting fluid stored in the liquid storage tank 26. The liquid state of the sex cutting fluid WO (water-soluble cutting fluid WO whose concentration α is unknown) is detected, and the concentration α of the water-soluble cutting fluid WO is calculated.

<Actual measurement processing 2>
In the detection of the water-soluble cutting fluid WO stored in the liquid storage tank 26, the controller 57 (calculation control means 55) detects the timer 59 when the machine tool Y starts processing (circulation of the water-soluble cutting fluid WO). “Zero set (t → 0)” t (FIG. 13: ST51).

Subsequently, the controller 57 outputs a detection signal to the timer 59. When the detection signal is input, the timer 59 measures the detection time tk.
When the detection time t of the timer 59 reaches the time tk (detection time t = tk) (FIG. 13: ST52, Yes), the controller 57 detects the measured liquid temperature Tg (° C.) and the conductivity of the liquid temperature detecting means 51. The measured electrical conductivity σg (μS / cm) detected by the rate detecting means 52 is simultaneously input (acquired) (FIG. 13: ST53).
Further, the controller 57 simultaneously inputs the sulfide gas concentration γg detected by the odor detecting means 53 and the hydrogen ion concentration index εg detected by the pH detecting means 54 (FIG. 13: ST53).
On the other hand, the controller 57 continues the time counting of the timer 59 unless the detection time t is the time tk (FIG. 13: ST52, No) and the detection is not completed (FIG. 13: ST64, No).
When the detection is completed (FIG. 13: ST64, Yes), the controller 57 ends the detection of the measured liquid temperature Tg, the measured electrical conductivity σg, the sulfide gas concentration γg, and the hydrogen ion concentration index εg, and is water-soluble. The calculation (calculation) of the concentration α of the cutting fluid WO is completed.

The controller 57 reads the calibration curve F (Tg) corresponding to the measured liquid temperature Tg from the storage means 56 based on the measured liquid temperature Tg input (acquired) from the liquid temperature detecting means 51 (FIG. 13: ST54). ).

Subsequently, the controller 57 receives a calibration curve F (Tg) with respect to the measured electrical conductivity σg (μS / cm) input (acquired) from the conductivity detecting means 52 and the measured liquid temperature Tg (° C.) read from the storage means 56. ), The concentration α of the water-soluble cutting fluid WO stored in the liquid storage tank 26 is calculated (FIG. 13: ST55).
The controller 57 substitutes the actually measured electrical conductivity σg input (acquired) from the conductivity detecting means 52 into the “x (x coordinate value)” of the equation (3), and stores the water in the liquid storage tank 26. Calculate the concentration α of the cutting fluid WO.

In the arithmetic control means 55, the controller 57 uses the measured liquid temperature Tg (measured liquid temperature signal), the measured electrical conductivity σg (measured electrical conductivity signal), the calculated concentration α (concentration signal), and the sulfide gas concentration γg (measured liquid temperature signal). The sulfide gas concentration signal) and the hydrogen ion concentration index εg (hydrogen gas concentration index signal) are output to the display means 65 (FIG. 13: ST56).
As a result, the display means 65 has the measured liquid temperature Tg and the measured electrical conductivity σg of the water-soluble cutting fluid WO, the concentration α of the water-soluble cutting fluid WO, the sulfide gas concentration γg of the water-soluble cutting fluid WO, and the water-soluble cutting. The hydrogen ion concentration index εg of the liquid WO is displayed.

Subsequently, the controller 57 reads the concentration discrimination value αx from the storage means 56 (FIG. 13: ST57), and compares the concentration α of the water-soluble cutting fluid WO and the concentration discrimination value αx (αmin <α <αmax).
In the controller 57, when the concentration α of the water-soluble cutting fluid WO is outside the concentration discrimination value αx (the concentration α is less than the minimum concentration value αmin or exceeds the maximum concentration value αmax) (FIG. 14: ST58, No), an alarm is given. The signal is output to the alarm means 66 (FIG. 14: ST63).
As a result, the alarm means 66 issues an alarm such as an alarm sound.

When the concentration α of the water-soluble cutting fluid WO is within the concentration discrimination value αx (FIG. 14: ST58, Yes), the controller 57 reads the odor discrimination value γx from the storage means 56 (FIG. 14: ST59).
The controller 57 compares the sulfide gas concentration γg and the odor discrimination value γx.
When the sulfide gas concentration γg exceeds the odor discrimination value γx (FIG. 14: ST60, Yes), the controller 57 outputs an alarm signal to the alarm means 66 (FIG. 14: ST63).
As a result, the alarm means 66 issues an alarm such as an alarm sound.

If the sulfide gas concentration γg does not exceed the odor discrimination value γx (FIG. 14: ST60, No), the controller 57 reads the hydrogen ion concentration index discrimination value εx from the storage means 56 (FIG. 14: ST61).
The controller 57 compares the hydrogen ion concentration index εg and the hydrogen ion concentration index discrimination value εx.
When the hydrogen ion concentration index εg exceeds the hydrogen ion concentration index discrimination value εx (FIG. 14: ST62, Yes), the controller 57 outputs an alarm signal to the alarm means 66 (FIG. 14: ST63).
As a result, the alarm means 66 issues an alarm such as an alarm sound.

In the arithmetic control means 55, the controller 57 outputs a hydrogen ion concentration index εg that does not exceed the hydrogen ion concentration index discrimination value εx (FIG. 14: ST62, No) or outputs an alarm signal (FIG. 14 :). If ST63) and the detection is not completed (FIG. 14: ST65, No), ST51 to ST64 are repeatedly executed.
As a result, the controller 57 inputs (acquires) the measured liquid temperature Tg, the measured electrical conductivity σg, the sulfide gas concentration γg, and the hydrogen ion concentration index εg every fixed detection time tk (every unit time). And the concentration α of the water-soluble cutting fluid WO is calculated every unit time.

When the detection is completed (FIG. 14: ST65, Yes), the controller 57 ends the detection of the measured liquid temperature Tg, the measured electrical conductivity Tg, the sulfide gas concentration γg, and the hydrogen ion concentration index εg, and is water-soluble. The calculation (calculation) of the concentration α of the cutting fluid WO is completed.

In the concentration detection device Z of the first and second embodiments, an example applied to the machine tool system X (machine tool Y) has been described, but the present invention is not limited to this.

Next, before detecting the measured liquid temperature Tg (° C.) and the measured electrical conductivity σg (μS / cm) of the water-soluble cutting fluid WO stored in the liquid storage tank 26, a plurality of water-soluble cutting fluids having different concentrations A detection test (liquid temperature-electrical conductivity detection test) for detecting the liquid temperature and electrical conductivity of a water-soluble cutting fluid (water-soluble cutting fluid having a known concentration) will be described.
Further, from the detection result of the liquid temperature-electrical conductivity detection test, the linear function formula f (i) corresponding to each concentration of the water-soluble cutting fluid is calculated, and the calibration curve F (Tg) [the calibration formula F of the linear function] is calculated. (Tg)] will be described.

1: Liquid temperature-electrical conductivity detection test The liquid temperature-electrical conductivity detection test was carried out for "Example 1", "Example 2" and "Example 3".

<Water-soluble cutting fluid>
In the liquid temperature-electric conductivity test, water-soluble cutting fluids WO1, WO2, and WO3 having the same components as the water-soluble cutting fluid stored in the liquid storage tank and having concentrations of 2%, 5%, and 10% were used.
Each of the water-soluble cutting fluids WO1 to WO3 is an alkaline liquid, and the water-soluble cutting stock solution was diluted with water to adjust the concentration, and the volume (volume) of the entire liquid was adjusted to 100 ml (mL).
As the water-soluble cutting stock solution, "SX-557S" of Taiyu Co., Ltd. was used.
The components of "SX-557S (water-soluble cutting stock solution)" of Taiyu Co., Ltd. are rust preventive additives (containing alkaline components) with a content of 20% or less, surfactants with a content of 40% or less, and a content of 20%. The following refined mineral oil, water with a content of 60% or less, and other components with a content of 1% or less are contained, and the content of each component is adjusted so that the content of the undiluted solution as a whole is 100%.
(Example 1)
In Example 1, a water-soluble cutting fluid WO1 having a concentration of 2% (volume concentration 2%) was used (when water: 98 mL and water-soluble cutting stock solution: 2 mL, the volume concentration α = 2/100 = 2%). ..
(Example 2)
In Example 2, a water-soluble cutting fluid WO2 having a concentration of 5% (volume concentration 5%) was used (water: 95 mL, water-soluble cutting stock solution; if 5 mL, the volume concentration α = 5/100 = 5%). ..
(Example 3)
In Example 3, a water-soluble cutting fluid WO3 having a concentration of 10% (volume concentration 10%) was used (when water: 90 mL and water-soluble cutting stock solution: 10 mL, the volume concentration α = 10/100 = 10%). ..

<Liquid temperature detecting means>
A thermocouple temperature sensor (general-purpose product) was used as the liquid temperature detecting means.

<Conductivity detecting means>
As the conductivity detecting means, a two-electrode conductivity sensor (general-purpose product) was used.

<Detection conditions>
(1) The water-soluble cutting fluids WO1 to WO3 of Examples 1 to 3 were placed in separate containers (beakers).
(2) The water-soluble cutting fluids WO1 to WO3 of Examples 1 to 3 were cooled in a freezer together with a container and then placed at room temperature.
In Examples 1 to 3, the temperatures of the water-soluble cutting fluids WO1 to WO3 were naturally raised at room temperature.
(3) Examples 1 to 3 Each water-soluble cutting liquid WO1 to WO3 is immersed in a thermocouple temperature sensor and a two-electrode conductivity sensor, and the thermocouple temperature sensor is used to immerse each water-soluble cutting liquid WO1 and WO1. Pre-measurement liquid temperature (sample liquid temperature) T1, T2, T3 (° C) of WO2, WO3 is detected, and pre-measurement electrical conductivity of each water-soluble cutting liquid WO1, WO2, WO3 is detected by a two-electrode conductivity sensor. (Sample electrical conductivity) σ1, σ2, σ3 (μS / cm) was detected.
(4) In Examples 1 to 3, the pre-measurement liquid temperature T1, T2, T3 (° C.) of each water-soluble cutting fluid WO1, WO2, WO3, and the pre-measurement electricity of the water-soluble cutting fluids WO1, WO2, WO3. Conductivity σ1, σ2, σ3 (μS / cm) were detected at the same time, and a plurality of detection times (multiple detections) were performed every 1 minute.
For each water-soluble cutting liquid WO1 to WO3, the pre-measurement liquid temperature T1 to T3 detected by the thermocouple temperature sensor and the pre-measurement electrical conductivity σ1 to σ3 detected by the two-electrode conductivity sensor are measured every fixed detection time. Obtained every (1 minute), multiple (many) pre-measured liquid temperatures (° C) with different temperatures and multiple (many) pre-measured electrical conductivity (many) at each pre-measured liquid temperature (° C) μS / cm) was obtained.

<Detection result>
(Example 1)
As the detection results of Example 1, the pre-measurement liquid temperature T1 (° C.) and the pre-measurement electrical conductivity σ1 (μS / cm) of the water-soluble cutting fluid WO1 having a concentration of 2% are shown in "Table 1" to "Table 11". ..
The number of detected data in Example 1 is 642 (detection No. 1 to detection No. 642).
Detection Nos. Of "Table 1" to "Table 11". 1-Detection No. 642 indicates the pre-measurement electrical conductivity σ1 (μS / cm) corresponding to the pre-measurement liquid temperature T1 (° C.). In No. 1, the pre-measurement electrical conductivity σ1 at the pre-measurement liquid temperature T1: 6.00 (° C.) is σ1 = 708.11156 (μS / cm).
The detection No. 1-Detection No. The pre-measurement electrical conductivity σ1 of 642 is a value obtained by amplifying the detected value detected by the two-electrode conductivity sensor four times (hereinafter, the same applies to Examples 2 and 3).

(Example 2)
Regarding the detection results of Example 2, the pre-measurement liquid temperature T2 (° C.) and the pre-measurement electrical conductivity σ2 (μS / cm) of the water-soluble cutting fluid WO2 (concentration 5%) are shown in "Table 12" to "Table 28". show.
The number of detected data in Example 2 is 1019 (Detection No. 1 to Detection No. 1019).
Detection Nos. Of "Table 12" to "Table 28". 1-Detection No. Reference numeral 1019 indicates the pre-measurement electrical conductivity σ2 (μS / cm) corresponding to the pre-measurement liquid temperature T2 (° C.). At 18, the pre-measurement electrical conductivity σ2 at the pre-measurement liquid temperature T2: 7.1875 (° C.) is σ2 = 830.6390 (μS / cm).

(Example 3)
Regarding the detection results of Example 3, the pre-measurement liquid temperature T3 (° C.) and the pre-measurement electrical conductivity σ3 (μS / cm) of the water-soluble cutting fluid WO3 (concentration 10%) are shown in "Table 29" to "Table 62". show.
The number of detected data in Example 3 is 2027 (Detection No. 1 to Detection No. 2027).
Detection Nos. Of "Table 29" to "Table 62". 1-Detection No. Reference numeral 2027 indicates the pre-measurement electrical conductivity σ3 (μS / cm) corresponding to the pre-measurement liquid temperature T3 (° C.). In 121, the pre-measurement electrical conductivity σ3 at the pre-measurement liquid temperature T3: 11.8750 (° C.) is σ3 = 1178.8634 (μS / cm).

In Examples 1 to 3, as shown in "Table 1" to "Table 62", each water-soluble cutting fluid WO1 to WO3 is water-soluble as the pre-measurement liquid temperature T1 to T3 (° C.) rises. It can be said that the pre-measurement electrical conductivity σ1 to σ3 (μS / cm) of the cutting fluids WO1 to WO3 also increases to a high value.

Detection No. of Example 1 As shown in “Table 4”, 201 shows the measured liquid temperature T1: 14.1875 (° C.) of the water-soluble cutting fluid WO1 and the pre-measured electrical conductivity σ1: 758.0074 (μS /) of the water-soluble cutting fluid WO1. cm).
Detection No. of Example 1 As shown in “Table 5”, 285 has a pre-measurement liquid temperature T1: 16.5000 (° C.) of the water-soluble cutting fluid WO1 and a pre-measurement electrical conductivity σ1: 769.5470 (μS) of the water-soluble cutting fluid WO1. / Cm).
Detection No. of Example 2 As shown in “Table 15”, 211 shows the pre-measurement liquid temperature T2: 14.1875 (° C.) of the water-soluble cutting fluid WO2 and the pre-measurement electrical conductivity σ2: 901.2342 (μS) of the water-soluble cutting fluid WO2. / Cm).
Detection No. of Example 2 As shown in “Table 16”, 299 shows the pre-measurement liquid temperature T2: 16.5000 (° C.) of the water-soluble cutting fluid WO2 and the pre-measurement electrical conductivity σ2: 919.5618 (μS) of the water-soluble cutting fluid WO2. / Cm).
Detection No. of Example 3 As shown in “Table 32”, 189 shows the pre-measurement liquid temperature T3: 14.1875 (° C.) of the water-soluble cutting fluid WO3 and the pre-measurement electrical conductivity σ3: 1226.0400 (μS) of the water-soluble cutting fluid WO3. / Cm).
Detection No. of Example 3 As shown in “Table 33”, 273 shows the pre-measurement liquid temperature T3: 16.5000 (° C.) of the water-soluble cutting fluid WO3 and the pre-measurement electrical conductivity σ3: 1271.5196 (μS) of the water-soluble cutting fluid WO3. / Cm).
As a result, in Examples 1 to 3, the pre-measurement electrical conductivity σ1 to σ3 corresponding to the pre-measurement liquid temperatures T1 to T3 at the same temperature has a concentration of 2% of the water-soluble cutting fluid WO1 (Example 1) < The relationship is that the water-soluble cutting fluid WO2 having a concentration of 5% (Example 2) <the water-soluble cutting fluid WO3 having a concentration of 10% (Example 3).
As described above, in the water-soluble cutting fluids WO1 to WO3 having the respective concentrations of 2%, 5%, and 10%, at the same pre-measurement liquid temperature (liquid temperature), the water-soluble cutting fluid becomes more water-soluble as the concentration of the water-soluble cutting fluid increases. The pre-measurement electrical conductivity (electrical conductivity) of the cutting fluid is high.

2: Calculation of linear function formula (operation)
From the detection results of the liquid temperature-electric conductivity detection test (detection results of Examples 1 to 3), a linear function corresponding to the water-soluble cutting fluids WO1, WO2, and WO3 having concentrations of 2%, 5%, and 10%, respectively. The formulas f1, f2, and f3 are calculated.

(1) Graph diagram (Fig. 8)
FIG. 8 shows the “pre-measurement liquid temperature (° C.) of the water-soluble cutting fluid” and the “measurement of the water-soluble cutting fluid” corresponding to the respective concentrations of 2%, 5%, and 10% n water-soluble cutting fluids WO1, WO2, WO3. It is a graph of the linear function formula f1, f2, f3 which shows the relation (relationship) of "pre-electrical conductivity (μS / cm)".
In FIG. 8, the horizontal axis (x coordinate axis) is the “pre-measurement liquid temperature (° C.)”, and the vertical axis (y coordinate axis) is the “pre-measurement electrical conductivity (μS / cm)”.
In FIG. 8, the “pre-measurement liquid temperature (liquid temperature)” is defined as the “x coordinate value (xi)”, and the “pre-measurement electrical conductivity (electric conductivity)” is defined as the “y coordinate value (yi)”.
In FIG. 8, the coordinate values are (xi, yi) = (liquid temperature before actual measurement, electrical conductivity before actual measurement).

(Example 1)
In Example 1, based on a plurality of pre-measurement liquid temperatures T1 (° C.) obtained from a thermocouple temperature sensor and a plurality of pre-measurement electrical conductivity σ1 (μS / cm) obtained from a two-electrode conductivity sensor. The linear function formula f1 with respect to the water-soluble cutting liquid WO1 having a concentration of 2% was calculated.
For the linear function formula f1 corresponding to the water-soluble cutting fluid WO1 having a concentration of 2%, y (2%) = Ax + B was calculated using, for example, the “least squares method”.
According to the "least squares method", if the number of data M (the number of detected data) and the i-th coordinate value (xi, yi) = (pre-measurement liquid temperature, pre-measurement electrical conductivity), the linear function formula f1: y The "A value (slope)" of (2%) = Ax + B is calculated by the equation (1).
The "B value (intercept)" of the linear function formula f1: y (2%) = Ax + B is calculated by the formula (2).

In "Example 1", the detection numbers of "Table 1" to "Table 11" are shown. 1-Detection No. For 642, the number of coordinate value data M (number of detected data) = 642, and each coordinate value (x1, y1) = (6.0000, 708.1156), (x2, y2) = (6.0625, 708.7944), ..., (X383, y383). ) = (18.6250, 780.4078), ..., (x641, y641) = (22.0625, 794.6626), (x642, y642) = (22.0625, 795.0020).
The number of coordinate value data of "Example 1" M = 642, and each coordinate value (x1, y1) = (6.0000, 708.1156), (x2, y2) = (6.0625, 708.7944), ..., (X383, y383) = Substituting (18.6250, 780.4078), ..., (x641, y641) = (22.0625, 794.6626), (x642, y642) = (22.0625, 795.0020) into equations (1) and (2), the linear function equation f1 : Calculate the "A value (slope)" and "B value (intercept)" of y (2%) = Ax + B.
The "A value (slope)" of the linear function formula f1 is A = 5.0979 according to the formula (1), and the "B value (intercept)" of the linear function formula f1 is B = according to the formula (2). It becomes 684.17.

As a result, the linear function expression f1 becomes
y (2%) = 5.0979x + 684.17 ... Equation (4)
Will be.
In the formula (4), “y (2%)” is the electrical conductivity before actual measurement σ1 (μS / cm), and “x” is the liquid temperature T1 (° C.) before actual measurement.

(Example 2)
In Example 2, based on the plurality of pre-measurement liquid temperatures T2 (° C.) obtained from the thermocouple temperature sensor and the plurality of pre-measurement electrical conductivity σ2 (μS / cm) obtained from the two-electrode conductivity sensor. The linear function formula f2 corresponding to the water-soluble cutting liquid WO2 having a concentration of 5% was calculated.
For the linear function formula f2 corresponding to the water-soluble cutting fluid WO2 having a concentration of 5%, y (5%) = Ax + B was calculated using the "least squares method" as in Example 1 (linear function formula f1). ..
In "Example 2", the detection Nos. In "Table 12" to "Table 28". 1-Detection No. For 1019, the coordinate values are (x1, y1) = (6.5000, 819.7782), (x2, y2) = (6.5625, 820.7964), ..., (x556, y556) = (20.81250, 965,0414), ..., ( x1018, y1018) = (24.1250, 1001.3572), (x1019, y1019) = (24.1250, 1001.0178).
The number of coordinate value data M (number of detected data) = 1019 of "Example 2", and each coordinate value (x1, y1) = (6.5000, 819.7782), (x2, y2) = (6.5625, 820.7964), ..., ( Substitute x556, y556) = (20.81250, 965,0414), ..., (x1018, y1018) = (24.1250, 1001.3572), (x1019, y1019) = (24.1250, 1001.0178) into equations (1) and (2). Then, the "A (slope)" and "B value (intercept)" of the linear function formula f2: y (5%) = Ax + B are calculated.
The "A value (slope)" of the linear function formula f2 is A = 10.0003 according to the formula (1), and the "B value (intercept)" of the linear function formula f2 is B = according to the formula (2). It becomes 757.33.

The linear function formula f2 is
y (5%) = 10.003x + 757.33 ... Equation (5)
Will be.
In the formula (5), “y (5%)” is the electrical conductivity before actual measurement σ2 (μS / cm), and “x” is the liquid temperature T2 (° C.) before actual measurement.

(Example 3)
In Example 3, the pre-measurement liquid temperature T3 (° C.) acquired from the thermocouple temperature sensor and the plurality of pre-measurement electrical conductivity σ3 (μS / cm) obtained from the two-electrode conductivity sensor are used. , The linear function formula f3 corresponding to the water-soluble cutting liquid WO3 having a concentration of 10% was calculated.
For the linear function formula f3 corresponding to the water-soluble cutting fluid WO3 having a concentration of 10%, y (10%) = Ax + B was calculated using the "least squares method" as in Example 1 (linear function formula f1). ..
In "Example 3", the detection Nos. In "Table 29" to "Table 62". 1-Detection No. For 2027, the coordinate values are (x1, y1) = (7.1875, 1052.6066), (x2, y2) = (7.2500, 1054.3036), ..., (x1005, y1005) = (24.0625, 1402.8674), ..., (x2025, y2025) = (25.1250, 1424.9284), (x2027, y2027) = (25.1250, 1424.2496).
The number of coordinate value data M (number of detected data) = 2027 of "Example 3", and each coordinate value (x1, y1) = (7.1875, 1052.6066), (x2, y2) = (7.2500, 1054.3036), ..., ( Substituting x1005, y1005) = (24.0625, 1402.8674), ..., (x2025, y2025) = (25.1250, 1424.9284), (x2027, y2027) = (25.1250, 1424.2496) into equations (1) and (2) , Linear function formula f3: y (10%) = Ax + B "A value (slope)" and "B value (intercept)" are calculated.
The "A value (slope)" of the linear function formula f3 is A = 18.973 according to the formula (1), and the "B value (intercept)" of the linear function formula f3 is B = according to the formula (2). It becomes 949.48.

The linear function formula f3 is
y (10%) = 18.973x + 949.48 ... Equation (6)
Will be.
In the formula (6), “y (10%)” is the electrical conductivity before actual measurement σ3 (μS / cm), and “x” is the liquid temperature T3 (° C.) before actual measurement.

In this way, before detecting the measured liquid temperature Tg (° C.) and the measured electrical conductivity σg (μS / cm) of the water-soluble cutting liquid WO (water-soluble cutting liquid of unknown concentration) stored in the liquid storage tank 26. , Water-soluble cutting liquids WO1 to WO3 (water-soluble cutting liquids with known concentrations) having the same components as the water-soluble cutting liquid WO stored in the liquid storage tank 26 and having concentrations of 2%, 5%, and 10% are used. Then, a liquid temperature-electrical conductivity test was carried out.
In the liquid temperature-electric conductivity test, the thermocouple temperature sensor and the two-electrode conductivity sensor are immersed in water-soluble cutting fluids WO1 to WO3 having concentrations of 2%, 5%, and 10%, and each water-soluble cutting fluid is immersed. The pre-measurement liquid temperatures T1 to T3 (° C.) and the pre-measurement electrical conductivity σ1 to σ3 (μS / cm) of WO1 to WO3 were detected (see “Table 1” to “Table 62”).
The linear function equations f1 to f3 corresponding to the water-soluble cutting fluids WO1 to WO3 having concentrations of 2%, 5%, and 10% are based on the liquid temperatures T1 to T3 before actual measurement and the electrical conductivity σ1 to σ3 before actual measurement. For example, it was calculated (calculated) using the "least squares method".
As shown in FIG. 8, the linear function equations f1, f2, and f3 corresponding to the water-soluble cutting fluids WO1 to WO3 having concentrations of 2%, 5%, and 10% have each coordinate value (xi, yi) = (before actual measurement). It can be said that it is a linear function that matches or approximates the liquid temperature (electrical conductivity before actual measurement).
As a result, for each concentration of water-soluble cutting fluid (water-soluble cutting fluid of known concentration), multiple (many) pre-measurement liquid temperatures (° C) and multiple (many) pre-measurement electrical conductivity (μS /). cm) is detected, and the linear function formula f (i): y (α%) of each concentration of water-soluble cutting fluid is based on each measured liquid temperature (° C.) and each measured electrical conductivity (μS / cm). ) = Ax + B can be calculated, but the linear function equation f (i) can be obtained as a linear function that matches or approximates each pre-measurement liquid temperature (x coordinate value) and each pre-measurement electrical conductivity (y coordinate value). can.

3: Calculation of calibration line (calibration formula of linear function) The controller 57 of the concentration detection device Z detects the water-soluble cutting fluid WO (water-soluble cutting fluid whose concentration α is unknown) stored in the liquid storage tank 26. The measured liquid temperature Tg (° C.) input (acquired) from the liquid temperature detecting means 51, each concentration data 2%, 5%, 10%, and the linear function formulas f1 to f3 corresponding to each water-soluble cutting fluid WO1 to WO3. Based on this, the calibration line F (Tg) [calibration formula F (Tg) of the linear function] corresponding to the measured liquid temperature Tg (° C.) input (acquired) from the liquid temperature detecting means 51 is calculated (calculated).
Hereinafter, the calculation (calculation) of the calibration curve F (Tg) [calibration formula F (Tg) of the linear function] will be described.

<1> Calculation of each water-soluble cutting fluid having different concentrations Calculation of electric conductivity (μS / cm) The controller 57 inputs (acquires) the measured liquid temperature Tg (° C.) from the liquid temperature detecting means 51. Measured liquid temperature Tg (° C.) input (acquired) from the liquid temperature detecting means 51 by substituting into "x (x coordinate value)" of the linear function equations f1, f2, f3 of the equations (4) to (6). Calculation of each water-soluble cutting fluid WO1 to WO3 corresponding to σb1, σb2, σb3 are calculated.
For example, the actual measured liquid temperature Tg = 20 (° C.) input (acquired) from the liquid temperature detecting means 51 is set, and the liquid temperature is substituted into "x (x coordinate value)" of each linear function formula f1 to f3. The calculated electrical conductivity σb1 of the water-soluble cutting fluid WO1 having a concentration of 2% is σb1 = 786.128 (μS / cm) according to the formula (4). The calculated electrical conductivity σb2 of the water-soluble cutting fluid WO2 having a concentration of 5% is σb2 = 957.390 (μS / cm) according to the formula (5), and the calculated electrical conductivity σb3 of the water-soluble cutting fluid WO3 having a concentration of 10%. Is σb3 = 1328.940 (μS / cm) according to the equation (6).
Calculated electrical conductivity σb1 = 786.128 (μS / cm) for water-soluble cutting fluid WO1 with a concentration of 2%, calculated electrical conductivity σb2 = 957.390 (μS / cm) for water-soluble cutting fluid WO2 with a concentration of 5%, and The calculated electrical conductivity σb3 = 1328.940 (μS / cm) of the water-soluble cutting fluid WO3 having a concentration of 10% is the electrical conductivity corresponding to the measured liquid temperature T = 20 (° C.) at the same temperature.

<2> Calibration curve F (Tg) [calibration formula F (Tg) of linear function]
FIG. 9 shows the relationship between the “concentration of the water-soluble cutting fluid (%)” and the “calculated electrical conductivity (μS / cm) of the water-soluble cutting fluid” corresponding to the measured liquid temperature Tg input from the liquid temperature detecting means 51 ( It is a graph of the calibration curve F (Tg) which shows (related).
In FIG. 9, the horizontal axis (x coordinate axis) is the “calculated electrical conductivity of the water-soluble cutting fluid (μS / cm)”, and the vertical axis (y coordinate axis) is the “concentration of the water-soluble cutting fluid (%)”. ..
In FIG. 9, the "calculated electric conductivity (electrical conductivity) of the water-soluble cutting fluid" is set to "x coordinate value (xi)", and the "concentration (%) of water-soluble cutting fluid" is set to "y coordinate value (yi)". ) ”. In FIG. 9, the coordinate values are (xi, yi) = (calculated electrical conductivity, concentration).

Calculation of water-soluble cutting fluids WO1 to WO3 with concentrations of 2%, 5%, and 10% For the electrical conductivity σb1 to σb3 and the respective concentration data of 2%, 5%, and 10%, the coordinate values are (x1, y1). = (Σb1, 0.02), (x2, y2) = (σb2, 0.05), (x3, y3) = (σb3, 0.10).
For example, for the measured liquid temperature Tg = 20 (° C.) of the water-soluble cutting fluid WO, the coordinate values are (x1, y1) = (786.128, 0.02), (x2, y2) = (957.390, 0.05), (x3, y3) = (1328.940, 0.10).
The calibration curve F (Tg) corresponding to the measured liquid temperature Tg input from the liquid temperature detecting means 51 is, for example, a linear function formula (calibration formula of a linear function), and is a calibration curve using the “least squares method”. F (Tg): y (Tg) = Ax + B was calculated.
The number of coordinate value data M = 3, and the coordinate values (x1, y1) = (σb1, 0.02), (x2, y2) = (σb2, 0.05), (x3, y3) = (σb3, 0.10.) ) And equation (2) to calculate the "A value (slope)" and "B value (intercept)" of the linear function calibration line F (Tg): y (Tg) = Ax + B.

The calibration curve F (Tg) corresponding to the measured liquid temperature Tg input (acquired) from the liquid temperature detecting means 51 is
y (Tg) = Ax + B ... Equation (7)
Will be.
In the formula (7), "(Tg)" is the concentration α of the water-soluble cutting fluid WO at the measured liquid temperature Tg, and "x" is the measured electrical conductivity σg of the water-soluble cutting fluid WO at the measured liquid temperature Tg. ..

For example, at the measured liquid temperature Tg = 20 (° C.) input (acquired) from the liquid temperature detecting means 51, the number of coordinate value data M = 3, the coordinate values (x1, y1) = (786.128, 0.02), (x2, y2). ) = (957.390,0.05), (x3, y3) = (1328.940, 0.10) is substituted into equations (1) and (2), and the "A value (slope)" of the calibration curve F (20) is the equation. According to (1), A = 0.000145, and the “B value (intercept)” of the calibration curve F (30) is B = −0.09216 from the equation (2).

The calibration curve F (20) with respect to the measured liquid temperature Tg = 20 (° C.) input (acquired) from the liquid temperature detecting means 51 is
y (20) = 0.000145x-0.09216 ... Equation (8)
Will be.

In this way, the controller 57 inputs (acquires) the measured liquid temperature Tg (° C.) from the liquid temperature detecting means 51 for the water-soluble cutting fluid WO (water-soluble cutting fluid of unknown concentration) stored in the liquid storage tank 26. ), Substituting this measured liquid temperature Tg into the linear function equations f1 to f3 of the equations (4) to (6), and substituting the water-soluble cutting fluids WO1 to WO3 having concentrations of 2%, 5%, and 10%, respectively. Calculation Calculate the electrical conductivity σb1 to σb3.
The calibration curve F (Tg) [calibration formula F (Tg) of the linear function] corresponding to the measured liquid temperature Tg (° C.) input (acquired) from the liquid temperature detecting means 51 is the concentration data of 2%, 5%, and 10 respectively. % And the calculated electric conductivity of each of the water-soluble cutting fluids WO1 to WO3 having concentrations of 2%, 5%, and 10%.
In the arithmetic control means 55 (controller 57) of the concentration measuring device Z, the electric conductivity actually measured from the conductivity detecting means 52 for the water-soluble cutting fluid WO (water-soluble cutting fluid of unknown concentration) stored in the liquid storage tank 26. σg is input (acquired), and the measured electrical conductivity σg input (acquired) from the conductivity detecting means 52 is input to the calibration line F (Tg) of the equation (7) [calibration equation F (Tg) of the linear function]. By substituting into "x (x coordinate value)", the unknown concentration of the water-soluble cutting fluid WO stored in the liquid storage tank 26 is calculated.

The present invention is optimal for detecting the concentration of stored water-soluble cutting fluid.

X Machine tool system Y Machine tool Z Concentration detection device (concentration detection device of the first and second embodiments)
F (Tg) calibration curve (calibration formula of linear function)
f (i) Linear function Tg Measured liquid temperature (liquid temperature)
σg Measured electrical conductivity (electrical conductivity)
26 Liquid storage tank 51 Liquid temperature detecting means 52 Conductivity detecting means 55 Calculation control means (agricultural degree calculation control means)
56 Memory means

Claims (2)

A concentration detector that detects the concentration of stored water-soluble cutting fluid.
A liquid temperature detecting means for detecting the measured liquid temperature Tg of the stored water-soluble cutting fluid immersed in the stored water-soluble cutting fluid, and
A conductivity detecting means that is juxtaposed with the liquid temperature detecting means, is immersed in the stored water-soluble cutting fluid, and detects the measured electrical conductivity σg of the stored water-soluble cutting fluid.
A plurality of concentration data having different concentrations are stored, and the water-soluble cutting fluid having the same component as the stored water-soluble cutting fluid and having each concentration corresponding to the respective concentration data has a water-soluble cutting fluid having each concentration. A storage means for storing a linear function formula showing the relationship between the liquid temperature and the electrical conductivity of the water-soluble cutting fluid, which corresponds to
An arithmetic control means for simultaneously inputting the measured liquid temperature Tg detected by the liquid temperature detecting means and the measured electrical conductivity σg detected by the conductivity detecting means at the time of the measured liquid temperature Tg. ,
With
The arithmetic control means
The linear function formula corresponding to each concentration data and the water-soluble cutting fluid of each concentration is read from the storage means.
Based on the measured liquid temperature Tg input from the liquid temperature detecting means and the linear function formula corresponding to the water-soluble cutting fluid of each concentration, the calculated electrical conductivity σbn of the water-soluble cutting fluid of each concentration was calculated.
Based on the concentration data and the calculated electrical conductivity σbn of the water-soluble cutting fluid of each concentration, the water-soluble cutting fluid at the measured liquid temperature Tg corresponding to the measured liquid temperature Tg input from the liquid temperature detecting means. The calibration line F (T) showing the relationship between the measured electrical conductivity σg of the water-soluble cutting fluid at the measured liquid temperature Tg was calculated.
The measured electric conductivity σg input from the conductivity detecting means, and the stored water-soluble cutting fluid based on the measured electric conductivity σg at the measured liquid temperature Tg and the calculated calibration curve F (T). A concentration detector characterized by calculating the concentration. It has a liquid storage tank that stores a water-soluble cutting fluid, processes the water-soluble cutting fluid stored in the liquid storage tank while supplying it to the workpiece, and supplies the water-soluble cutting fluid to the workpiece. The machine to be collected in the liquid storage tank and
A concentration detection device that detects the concentration of the water-soluble cutting fluid stored in the liquid storage tank, and
Consists of, including
The concentration detector is
A liquid temperature detecting means for detecting the measured liquid temperature Tg of the water-soluble cutting fluid stored in the liquid storage tank after being immersed in the water-soluble cutting fluid stored in the liquid storage tank.
Conductivity detecting means for detecting the measured electrical conductivity σg of the water-soluble cutting fluid stored in the liquid storage tank, which is arranged in parallel with the liquid temperature detecting means and immersed in the water-soluble cutting fluid stored in the liquid storage tank. When,
A plurality of concentration data having different concentrations are stored, and each concentration of the water-soluble cutting fluid having the same component as the water-soluble cutting fluid stored in the liquid storage tank and corresponding to each concentration data. A storage means for storing a linear function formula showing the relationship between the liquid temperature and the electrical conductivity of the water-soluble cutting fluid corresponding to the water-soluble cutting fluid of
An arithmetic control means for simultaneously inputting the measured liquid temperature Tg detected by the liquid temperature detecting means and the measured electrical conductivity σg detected by the conductivity detecting means, and the measured electrical conductivity σg at the measured liquid temperature Tg. ,
With
The arithmetic control means
The linear function formula corresponding to each concentration data and the water-soluble cutting fluid of each concentration is read from the storage means.
Based on the measured liquid temperature Tg input from the liquid temperature detecting means and the linear function formula corresponding to the water-soluble cutting fluid of each concentration, the calculated electrical conductivity σbn of the water-soluble cutting fluid of each concentration was calculated.
Based on the concentration data and the calculated electrical conductivity σbn of the water-soluble cutting fluid of each concentration, the water-soluble cutting fluid at the measured liquid temperature Tg corresponding to the measured liquid temperature Tg input from the liquid temperature detecting means. The calibration line F (T) showing the relationship between the measured electrical conductivity σg of the water-soluble cutting fluid at the measured liquid temperature Tg was calculated.
It is the measured electric conductivity σg input from the conductivity detecting means, and is stored in the liquid storage tank based on the measured electric conductivity σg at the measured liquid temperature Tg and the calculated calibration curve F (T). machine tool system that is characterized in that calculating the concentration of the water-soluble cutting fluid.

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