JP7637413B2 - Water-soluble cutting oil, water-soluble cutting oil management device, and water-soluble cutting oil management method - Google Patents

Description

The present invention relates to a water-soluble cutting oil, a water-soluble cutting oil management device, and a water-soluble cutting oil management method.

One method of maintaining the cutting ability of tool blades of machine tools is to spray water-soluble cutting oil on the tool blades to cool, lubricate, and prevent rust between the blades and the workpiece, and to remove cutting chips. This sprayed water-soluble cutting oil is collected and reused, but as the cutting oil is used, the concentration and/or volume of the cutting oil changes, for example as the water in the cutting oil evaporates, making it difficult to adjust the lubrication performance of the water-soluble cutting oil. Therefore, a water-soluble cutting oil management device has been proposed that measures the concentration and/or volume of the water-soluble cutting oil and makes it easier to adjust the concentration and/or volume. For example, Patent Document 1 discloses a water-soluble cutting oil management device that measures the concentration of the water-soluble cutting oil, supplies water when the concentration is high, and supplies undiluted water-soluble cutting oil when the concentration is low.

Japanese Utility Model Application Publication No. 5-023720

The water-soluble cutting oil management device disclosed in Patent Document 1 is prone to contamination of the water-soluble cutting oil with foreign matter such as sludge and chips, and non-emulsified oils such as hydraulic oil and sliding oil. These sludge and other contaminants cause errors in the concentration measurement, and also cause errors when adjusting the concentration of the water-soluble cutting oil.

The present invention has been made to solve the problems described above, and provides a water-soluble cutting oil management device that can measure the concentration and/or liquid volume of only water-soluble cutting oil that does not contain foreign matter and/or non-emulsified oil.

In order to achieve the above object, in the water-soluble cutting oil management device according to the embodiment of the present invention,
A control unit that manages the concentration of the water-soluble cutting oil stored in the coolant tank;
A pump that sucks the water-soluble cutting oil;
a foreign matter removing filter provided between the coolant tank and the pump to remove foreign matter contained in the water-soluble cutting oil;
an oil removal filter provided between the foreign matter removal filter and the pump, for removing non-emulsified oil contained in the water-soluble cutting oil from which the foreign matter has been removed;
a concentration sensor for measuring the concentration of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed ;
an adjusting unit for adjusting the concentration of the water-soluble cutting oil when the concentration of the water-soluble cutting oil deviates from the control concentration of the water-soluble cutting oil controlled by the control unit ;
Equipped with
The adjusting unit includes a compounding unit that compounds a correction concentration cutting oil having a lower concentration than the control concentration or a correction concentration cutting oil having a higher concentration than the control concentration,
When the concentration of the water-soluble cutting oil measured by the concentration sensor is lower than the control concentration, a high-concentration correction concentration cutting oil is supplied to the water-soluble cutting oil;
When the concentration of the water-soluble cutting oil measured by the concentration sensor is higher than the control concentration, the correction concentration cutting oil having a lower concentration is supplied to the water-soluble cutting oil;
The blending unit is
A mixing tank;
A water supply unit that supplies water to the mixing tank;
a concentrate supply unit that drips the concentrate of the water-soluble cutting oil into the mixing tank in which the water is stored;
a raw liquid flow meter provided in the raw liquid supply unit and configured to measure a flow rate of the raw liquid dropped into the mixing tank;
a stock solution on-off valve provided in the stock solution flow path of the stock solution supply unit, the stock solution on-off valve being closed when the amount of the stock solution dropped into the mixing tank reaches an amount constituting the corrected concentration cutting oil;
a mixing unit that mixes the raw liquid dropped into the mixing tank and/or the water stored in the mixing tank;
Equipped with
The corrected concentration cutting oil is mixed at a more uniform concentration than when natural convection is used .

The water-soluble cutting oil management device according to the embodiment of the present invention is further configured to include a pH meter that measures the pH of the water-soluble cutting oil from which the foreign matter and/or oil has been removed.

The water-soluble cutting oil management device according to the embodiment of the present invention is configured to include an alarm that issues a warning if the pH of the water-soluble cutting oil is not within the pH range set by the control unit.

In the water-soluble cutting oil management method according to the embodiment of the present invention,
A step of inputting the control concentration of the water-soluble cutting oil;
A step of sucking water-soluble cutting oil from a coolant tank;
removing foreign matter contained in the sucked water-soluble cutting oil;
removing non-emulsified oil contained in the water-soluble cutting oil from which the foreign matter has been removed;
Measuring the concentration of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed;
If the concentration of the water-soluble cutting oil is out of the control concentration, adjusting the concentration of the water-soluble cutting oil;
Equipped with
The step of adjusting the concentration of the water-soluble cutting oil includes:
If the measured concentration of the water-soluble cutting oil is lower than the control concentration, a correction concentration cutting oil having a higher concentration than the control concentration is prepared and supplied to the water-soluble cutting oil;
When the measured concentration of the water-soluble cutting oil is higher than the control concentration, the correction concentration cutting oil having a lower concentration than the control concentration is prepared and supplied to the water-soluble cutting oil;
Equipped with
The low concentration correction concentration cutting oil or the high concentration correction concentration cutting oil is prepared by:
Supplying water to a mixing vessel;
Dropping the water-soluble cutting oil stock solution into the mixing tank in which the water is stored;
A step of stirring the dropwise added concentrate and the water stored in the mixing tank;
The corrected concentration cutting oil is prepared at a more uniform concentration than when natural convection is used .

The water-soluble cutting oil management method according to an embodiment of the present invention includes a step of measuring the pH of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed.

In the water-soluble cutting oil management method according to the embodiment of the present invention, in a water-soluble cutting oil having a specified concentration range managed by a water-soluble cutting oil management device,
When the concentration of the water-soluble cutting oil is lower than the specified range, it is mixed with the corrected concentration cutting oil having a higher concentration than the specified concentration, and/or when the concentration of the water-soluble cutting oil is higher than the specified range, it is mixed with the corrected concentration cutting oil having a lower concentration than the specified concentration, thereby making it possible to maintain the concentration of the water-soluble cutting oil within the specified range.

The water-soluble cutting oil management device and water-soluble cutting oil management method according to the embodiment of the present invention remove sludge, oil, etc. before measuring the concentration, thereby suppressing errors in concentration measurement caused by sludge, oil, etc., and improving the accuracy of water-soluble cutting oil concentration measurement and/or concentration adjustment.

FIG. 1 is a schematic diagram showing a water-soluble cutting oil management device according to a first embodiment; FIG. 1 is a schematic diagram showing a water-soluble cutting oil management device according to a second embodiment;

The water-soluble cutting oil management device according to the embodiment of the present invention will be described in detail below with reference to the drawings.

Embodiment 1.
The water-soluble cutting oil management device 1 according to the first embodiment of the present invention will be described below. The water-soluble cutting oil management device 1 is a management device that measures the concentration and/or volume of the water-soluble cutting oil to make it easier to adjust the concentration and/or volume of the water-soluble cutting oil in order to prevent the difficulty of adjusting the lubrication performance due to changes in the concentration and/or volume of the water-soluble cutting oil.

As shown in FIG. 1, the water-soluble cutting oil management device 1 includes a circulation unit 10 that circulates the water-soluble cutting oil to be used for measuring the concentration, a foreign matter removal filter 20 that removes foreign matter contained in the water-soluble cutting oil, an oil removal filter 30 that removes non-emulsified oil contained in the water-soluble cutting oil, a concentration sensor 40 that measures the concentration of the water-soluble cutting oil, a level gauge 50 that measures the amount of the water-soluble cutting oil, and an adjustment unit 100 that adjusts the concentration and/or amount of the water-soluble cutting oil.

The circulation unit 10 is a circulation path that sucks up the water-soluble cutting oil in the coolant tank 400, which stores water-soluble processing solutions such as water-soluble cutting oil and water-soluble cleaning fluid used in equipment such as machine tools, and then discharges the water-soluble cutting oil back into the coolant tank 400. The coolant tank 400 is a tank that stores the water-soluble cutting oil to be sprayed on the tool blades of the machine tools. The circulation unit 10 includes a cutting oil outlet pipe 11 that draws out the water-soluble cutting oil in the coolant tank 400, a first pump 12 that sucks up the water-soluble cutting oil, and a cutting oil discharge pipe 13 that discharges the water-soluble cutting oil into the coolant tank 400.

The cutting oil discharge pipe 11 is a pipe having one end provided inside the coolant tank 400 and the other end connected to the first pump 12. One end of the cutting oil discharge pipe 11 opens near the bottom of the coolant tank 400 so as to be below the liquid level of the water-soluble cutting oil stored in the coolant tank 400.

The first pump 12 is a pump that draws water-soluble cutting oil from the coolant tank 400 through the cutting oil outlet pipe 11. The first pump 12 has a suction port and a discharge port. The cutting oil outlet pipe 11 is connected to the suction port of the first pump 12.

The cutting oil discharge pipe 13 is a pipe having one end provided in the coolant tank 400 and the other end connected to the discharge port of the first pump 12. One end of the cutting oil discharge pipe 13 opens near the ceiling of the coolant tank 400 so that it is above the liquid level of the water-soluble cutting oil stored in the coolant tank 400. The cutting oil discharge pipe 13 discharges the water-soluble cutting oil sucked into the coolant tank 400 by the first pump 12.

The circulation unit 10 returns the water-soluble cutting oil sucked from the coolant tank 400 by the first pump 12 to the coolant tank 400 via the cutting oil outlet pipe 11 and the cutting oil discharge pipe 13, thereby circulating the water-soluble cutting oil.

The foreign matter removal filter 20 is a filter installed in the cutting oil outlet pipe 11 that removes foreign matter such as sludge and chips from the water-soluble cutting oil.

The oil removal filter 30 is a filter that removes non-emulsified oil such as hydraulic oil and sliding oil from the water-soluble cutting oil provided in the cutting oil outlet pipe 11. The oil removal filter 30 is provided between the foreign matter removal filter 20 and the first pump 12.

The concentration sensor 40 measures the concentration of the water-soluble cutting oil flowing through the cutting oil discharge pipe 11, from which foreign matter and/or non-emulsified oil has been removed by the foreign matter removal filter 20 and the oil removal filter 30.

The level gauge 50 measures the level of the water-soluble cutting oil in the coolant tank 400 and measures the amount of water-soluble cutting oil.

When the concentration of the water-soluble cutting oil in the coolant tank 400 falls outside the range of the preset control concentration, or when the amount of water-soluble cutting oil in the coolant tank 400 becomes low, the adjustment unit 100 supplies a correction concentration cutting oil to the water-soluble cutting oil in the coolant tank 400 to adjust the concentration and/or amount of the water-soluble cutting oil. The adjustment unit 100 includes a correction concentration cutting oil supply pipe 110, a second pump 120, and a blending unit 130 that blends the correction concentration cutting oil.

The correction concentration cutting oil supply pipe 110 is a pipe having one end provided inside the coolant tank 400 and the other end connected to the blending section 130. One end of the correction concentration cutting oil supply pipe 110 opens near the ceiling of the coolant tank 400, above the liquid level of the water-soluble cutting oil stored in the coolant tank 400.

The second pump 120 is provided in the corrected concentration cutting oil supply pipe 110 and pumps the corrected concentration cutting oil prepared in the preparation unit 130 to the coolant tank 400.

The blending unit 130 blends water and a concentrate of water-soluble cutting oil to prepare the corrected concentration cutting oil. The blending unit 130 includes a mixing tank 140, a water supply unit 150 that supplies water, a concentrate supply unit 160 that supplies the concentrate, and a mixing unit 170 that mixes the water and the concentrate.

The mixing tank 140 is a tank for storing water and the stock solution and mixing the corrected concentration cutting oil. The mixing tank 140 is connected to the corrected concentration cutting oil supply pipe 110. The corrected concentration cutting oil mixed in the mixing tank 140 is supplied to the coolant tank 400 via the corrected concentration cutting oil supply pipe 110.

The water supply unit 150 supplies water to the mixing tank 140. The water supply unit 150 includes a water supply source 151, which is a water supply source, a water supply path 152, which is a water flow path, a water flow meter 153 that measures the water flow rate, and a water on-off valve 154 that opens and closes the water flow path. The water supply source 151 is a supply source of water supplied to the mixing tank 140. The water supply path 152 forms a flow path between the water supply source 151 and the mixing tank 140. One end of the water supply path 152 opens near the ceiling of the mixing tank 140.

The water flow meter 153 is provided in the water supply passage 152 and is a flow meter that measures the flow rate of water flowing through the water supply passage 152.

The water on-off valve 154 is a valve provided in the water supply passage 152. The water on-off valve 154 opens and closes the flow path of water flowing through the water supply passage 152 to supply water from the water supply source 151 to the mixing tank 140 or stop the supply of water.

The stock solution supply unit 160 supplies the stock solution of the water-soluble cutting oil to the mixing tank 140. The stock solution supply unit 160 includes a stock solution tank 161 in which the stock solution is stored, a stock solution supply path 162 which serves as a flow path for the stock solution, a third pump 163 which draws the stock solution, a stock solution flowmeter 164 which measures the flow rate of the stock solution, and a stock solution on-off valve 165 which opens and closes the flow path for the stock solution. The stock solution tank 161 is a tank which stores the stock solution. The stock solution supply path 162 forms a flow path between the stock solution tank 161 and the mixing tank 140. One end of the stock solution supply path 162 opens near the ceiling of the mixing tank 140.

The third pump 163 is provided in the concentrate supply line 162 and pumps the concentrate of water-soluble cutting oil stored in the concentrate tank 161 into the mixing tank 140.

The concentrate flow meter 164 is provided in the concentrate supply passage 162 and is a flow meter that measures the flow rate of the water-soluble cutting oil concentrate flowing through the concentrate supply passage 162.

The stock solution on-off valve 165 is a valve provided in the stock solution supply passage 162. The stock solution supply passage 162 opens and closes the flow path of the stock solution flowing through the stock solution supply passage 162 to supply the stock solution of the water-soluble cutting oil from the stock solution tank 161 to the mixing tank 140 or to stop the supply of the stock solution.

The stirring unit 170 is a motor-driven stirrer that is provided in the mixing tank 140 and stirs the water supplied to the mixing tank 140 and the water-soluble cutting oil concentrate supplied to the mixing tank 140.

Each part of the water-soluble cutting oil management device 1 described above is controlled by the control unit 200. The control unit 200 can be used to input the management concentration.

The administrator of the water-soluble cutting oil management device 1 can set the management concentration of the water-soluble cutting oil and the concentrations of low-concentration and/or high-concentration corrected concentration cutting oil in the control unit 200. The administrator can also select water and/or undiluted water-soluble cutting oil as the low-concentration and/or high-concentration corrected concentration cutting oil.

First, the control unit 200 drives the first pump 12 to suck the water-soluble cutting oil from the coolant tank 400 through the cutting oil outlet pipe 11 in order to measure the concentration of the water-soluble cutting oil.

The sucked water-soluble cutting oil then passes through a foreign matter removal filter 20 installed on the cutting oil outlet pipe 11, and foreign matter such as sludge and chips in the water-soluble cutting oil are removed.

The water-soluble cutting oil from which foreign matter has been removed then passes through an oil removal filter 30 installed on the cutting oil outlet pipe 11, and non-emulsified oils such as hydraulic oil and sliding oil in the water-soluble cutting oil are removed.

The water-soluble cutting oil from which foreign matter and/or non-emulsified oil has been removed passes through the first pump 12 and is then pumped into the cutting oil discharge pipe 13.

The concentration of the water-soluble cutting oil sent to the cutting oil discharge pipe 13 is measured by the concentration sensor 40 on the cutting oil discharge pipe 13.

A concentration meter cannot accurately measure the concentration if foreign matter and/or non-emulsified oil is present. However, the water-soluble cutting oil whose concentration is measured by the concentration sensor 40 has had foreign matter and/or non-emulsified oil removed, allowing for more accurate concentration measurements.

The concentration sensor 40 transmits the measured concentration of the water-soluble cutting oil to the control unit 200. The water-soluble cutting oil whose concentration has been measured is then discharged into the coolant tank 400. The water-soluble cutting oil passing through the first pump 12 has had foreign matter and/or non-emulsified oil removed by the foreign matter removal filter 20 and the oil removal filter 30, so clogging of the first pump 12 can be suppressed. The control unit 200 then stops the first pump 12.

Next, the control unit 200 determines whether the concentration of the water-soluble cutting oil measured by the concentration sensor 40 is within the range of the controlled concentration. If the concentration of the water-soluble cutting oil is within the set range, the control unit 200 further determines whether the amount of water-soluble cutting oil measured by the level gauge 50 is sufficient. Then, if the concentration of the water-soluble cutting oil is within the set range and the amount of water-soluble cutting oil is sufficient, the process ends.

When the concentration of the water-soluble cutting oil measured by the concentration sensor 40 is higher than the control concentration, the adjustment unit 100 prepares a low-concentration correction concentration cutting oil set by the blending unit 130 and stores it in the mixing tank 140 of the blending unit 130. When the concentration of the water-soluble cutting oil measured by the concentration sensor 40 is lower than the control concentration, the control unit 200 prepares a high-concentration correction concentration cutting oil set by the blending unit 130 and stores it in the mixing tank 140. Furthermore, when the amount of water-soluble cutting oil measured by the level gauge 50 is low, the control unit 200 prepares a correction concentration cutting oil of the control concentration and stores it in the mixing tank 140. The correction concentration cutting oil is prepared according to the following procedure.

First, water is supplied to the mixing tank 140 by the water supply unit 150 of the blending unit 130. Specifically, the control unit 200 opens the water on-off valve 154 and supplies water from the water supply source 151 to the mixing tank 140 via the water supply path 152.

The water flow meter 153 measures the amount of water supplied from the water supply source 151 to the mixing tank 140. The water flow meter 153 then transmits data on the measured amount of water to the control unit 200. When the amount of water measured by the water flow meter 153 reaches a fixed amount, the control unit 200 closes the water on-off valve 154 and stops the supply of water from the water supply source 151 to the mixing tank 140.

Next, the concentrate supply unit 160 of the blending unit 130 supplies the concentrate of water-soluble cutting oil to the mixing tank 140. Specifically, first, the control unit 200 reads the amount of concentrate of water-soluble cutting oil required to blend the corrected concentration cutting oil of the set concentration.

Then, the control unit 200 drives the third pump 163 of the stock solution supply unit 160 and opens the stock solution on-off valve 165. The third pump 163 sucks the stock solution of the water-soluble cutting oil in the stock solution tank 161 and sends the stock solution to the mixing tank 140 via the stock solution supply path 162. The stock solution sent to the mixing tank 140 is dripped into the water stored in the mixing tank 140.

Furthermore, while the concentrate is being dripped into the water in the mixing tank 140, the control unit 200 drives the stirring unit 170 to stir the concentrate and water. Because the concentrate is dripped into the tank filled with water and the water level is constant, the concentrate does not adhere to the wall of the mixing tank, and the stirring unit 170 can stir the concentrate and water so that they are mixed evenly.

The concentrate flow meter 164 measures the amount of concentrate of water-soluble cutting oil supplied from the concentrate tank 161 to the mixing tank 140. The concentrate flow meter 164 then transmits the measured data to the control unit 200. When the amount of concentrate measured by the concentrate flow meter 164 reaches the amount of concentrate read from the control program, the control unit 200 closes the concentrate on-off valve 165 and stops the supply of concentrate from the concentrate tank 161 to the mixing tank 140.

Finally, the control unit 200 drives the second pump 120 of the adjustment unit 100 to pump the corrected concentration cutting oil stored in the mixing tank 140 to the coolant tank 400 via the corrected concentration cutting oil supply pipe 110. Because the corrected concentration cutting oil is pumped by the second pump 120, the water-soluble cutting oil management device 1 can supply the corrected concentration cutting oil regardless of the height or position of the coolant tank 400.

The pressure-fed corrected concentration cutting oil creates convection in the coolant tank 400, making it easier to mix with the water-soluble cutting oil stored in the coolant tank 400 before the corrected concentration cutting oil is supplied, making the concentration of the water-soluble cutting oil in the coolant tank 400 uniform.

As described above, the water-soluble cutting oil management device 1 can perform more accurate concentration measurement of water-soluble cutting oil by removing foreign matter and/or non-emulsified oil.

For example, the water-soluble cutting oil management device 1 can manage the water-soluble cutting oil by mixing it with a correction concentration cutting oil having a higher concentration than the specified concentration when the concentration of the water-soluble cutting oil is lower than the specified concentration range, and/or by mixing it with a correction concentration cutting oil having a lower concentration than the specified concentration when the concentration of the water-soluble cutting oil is higher than the specified concentration range, thereby making it possible to maintain the water-soluble cutting oil concentration within the specified range (managing the water-soluble cutting oil concentration).

Conventionally, the concentration of water-soluble cutting oil was adjusted by supplying the stock solution or water directly to the coolant tank 400 or the pipes through which the water-soluble cutting oil flows. As a result, the mixing of the water-soluble cutting oil with the stock solution and water was left to natural convection, which caused the problem of the water-soluble cutting oil having an uneven concentration. The corrected concentration cutting oil of this embodiment is already a uniform mixture of stock solution and water, so it is easy to mix with the water-soluble cutting oil stored in the coolant tank 400 before the corrected concentration cutting oil is supplied. As a result, the water-soluble cutting oil management device 1 can make the concentration of the water-soluble cutting oil uniform.

Embodiment 2.
In the above-mentioned embodiment 1, only the concentration of the water-soluble cutting oil was measured. The water-soluble cutting oil management device may further measure the pH of the water-soluble cutting oil. As the pH value of the water-soluble cutting oil decreases as deterioration progresses, the deterioration of the water-soluble cutting oil can be detected by measuring the pH value of the water-soluble cutting oil.

As shown in FIG. 2, the water-soluble cutting oil management device 2 according to the second embodiment of the present invention may further include a pH meter 300 provided in the cutting oil discharge pipe 13.

The pH meter 300 is provided on the cutting oil discharge pipe 13 between the concentration sensor 40 and the coolant tank 400. The pH meter 300 includes a pH measurement tank 301 provided on the cutting oil discharge pipe 13, a comparison electrode 302 immersed in the water-soluble cutting oil, a glass electrode 303 immersed in a solution of pH 7, and an alarm 304 that issues a warning. The comparison electrode 302 and the glass electrode 303 are provided in the pH measurement tank 301.

The pH measurement tank 301 temporarily stores the water-soluble cutting oil flowing through the cutting oil discharge pipe 13. The comparison electrode 302 is immersed in the water-soluble cutting oil in the pH measurement tank 301. The pH meter 300 measures the pH using the electromotive force generated between the comparison electrode 302 and the glass electrode 303. The alarm 304 is an alarm that sounds an alarm when an abnormality occurs in the pH of the water-soluble cutting oil.

Next, we will explain the operation of the water-soluble cutting oil management device 2.

When setting the control concentration of the water-soluble cutting oil and the concentration of the corrected concentration cutting oil, the administrator of the water-soluble cutting oil management device 2 can also set the pH range of the water-soluble cutting oil.

The control unit 200 drives the first pump 12 to suck the water-soluble cutting oil in the coolant tank 400 through the cutting oil outlet pipe 11. The sucked water-soluble cutting oil is then subjected to removal of foreign matter and/or non-emulsified oil by the foreign matter removal filter 20 and the oil removal filter 30. The concentration of the water-soluble cutting oil from which the foreign matter and/or non-emulsified oil has been removed is measured by the concentration sensor 40. The concentration sensor 40 then transmits the measured concentration of the water-soluble cutting oil to the control unit 200.

The pH of the water-soluble cutting oil measured by the concentration sensor 40 is measured by the pH meter 300. Specifically, the water-soluble cutting oil is temporarily stored in the pH measurement tank 301 of the pH meter 300. Then, a comparison electrode 302 is immersed in the water-soluble cutting oil in the pH measurement tank 301, and the pH is measured using the electromotive force generated between the comparison electrode 302 and the glass electrode 303.

The comparison electrode 302 of the pH meter 300 is susceptible to deterioration and damage when it comes into contact with foreign matter and/or non-emulsified oil. However, the water-soluble cutting oil passing through the cutting oil discharge pipe 13 has foreign matter and/or non-emulsified oil removed, so the life of the comparison electrode 302 can be extended.

The pH meter 300 transmits the measured pH of the water-soluble cutting oil to the control unit 200. The water-soluble cutting oil whose pH has been measured is then discharged into the coolant tank 400 through the cutting oil discharge pipe 13. The control unit 200 then stops the first pump 12.

If the pH of the water-soluble cutting oil measured by the pH meter 300 is outside the set pH range of the water-soluble cutting oil, the control unit 200 causes the alarm 304 of the pH meter 300 to emit a warning sound.

When the concentration of the water-soluble cutting oil measured by the concentration sensor 40 is not within the range of the control concentration, or when the amount of water-soluble cutting oil measured by the level gauge 50 is low, the control unit 200 causes the blending unit 130 of the adjustment unit 100 to blend a correction concentration cutting oil and stores it in the mixing tank 140 of the blending unit 130.

First, the control unit 200 commands the water on-off valve 154 to open, and water is supplied from the water supply source 151 to the mixing tank 140 via the water supply line 152. Then, when the amount of water measured by the water flow meter 153 reaches a fixed amount, the control unit 200 commands the water on-off valve 154 to close, and the supply of water from the water supply source 151 to the mixing tank 140 is stopped.

Then, the control unit 200 drives the third pump 163 of the stock solution supply unit 160 and opens the stock solution on-off valve 165. The third pump 163 sends the water-soluble cutting oil stock solution in the stock solution tank 161 through the stock solution supply path 162 to the mixing tank 140, where it is dripped. Furthermore, the control unit 200 drives the stirring unit 170 to stir the stock solution and water.

When the amount of concentrate measured by the concentrate flow meter 164 reaches the amount of concentrate read from the control program, the control unit 200 closes the concentrate on-off valve 165 and stops the supply of concentrate from the concentrate tank 161 to the mixing tank 140.

Finally, the control unit 200 drives the second pump 120 of the adjustment unit 100 to pump the corrected concentration cutting oil stored in the mixing tank 140 to the coolant tank 400 via the corrected concentration cutting oil supply pipe 110.

As described above, the water-soluble cutting oil management device 2 can measure pH while suppressing deterioration of the comparison electrode 302 by removing foreign matter and/or non-emulsified oil. If the measured pH is outside the set pH range, the water-soluble cutting oil management device 2 issues an alarm sound from the alarm 304. Therefore, for example, the administrator of the water-soluble cutting oil management device 2 can be made aware of the abnormality.

In the above-mentioned embodiment 1, first, the control unit 200 sets the control concentration of the water-soluble cutting oil and the concentration of the corrected concentration cutting oil. This setting may be displayed on a touch panel.

In the above-mentioned embodiment 1, the water-soluble cutting oil sucked from the coolant tank 400 by the first pump 12 was returned to the coolant tank 400 after the concentration was measured. However, this is not limited to the above, and the water-soluble cutting oil used after the concentration was measured may be discarded.

In the above-mentioned embodiment 1, the concentration of the water-soluble cutting oil is measured. The control unit 200 may store the measured concentration and monitor the change in concentration.

The concentration sensor 40 according to the first embodiment may be a refractometer that uses the refraction of light to measure the concentration of a liquid, or may be an instrument that uses the transmission speed of ultrasonic waves, electrical conductivity, or a combination of these to measure the concentration of a liquid.

In the above-mentioned first embodiment, the concentration sensor 40 is provided on the cutting oil discharge pipe 13. However, the concentration sensor 40 may be provided at a position where it can measure the concentration of the water-soluble cutting oil from which foreign matter and/or oil has been removed. For example, the concentration sensor 40 may be provided on the cutting oil discharge pipe 11 between the oil removal filter 30 and the first pump 12.

In the above-mentioned first embodiment, the foreign matter removal filter 20 and the oil removal filter 30 are, for example, replaceable cartridge types. However, the foreign matter removal filter 20 and/or the oil removal filter 30 may be any filter capable of removing foreign matter and/or non-emulsified oil.

In the above-mentioned embodiment 1, the amount of water stored in the mixing tank 140 is a fixed amount. However, the amount of water stored in the mixing tank 140 may be changeable by the control unit 200.

In the above-mentioned second embodiment, the alarm 304 uses an alarm sound to notify the manager of the water-soluble cutting oil management device 2 of an abnormality in the water-soluble cutting oil. For example, the alarm 304 only needs to be able to notify the manager of the water-soluble cutting oil management device 2 of an abnormality in the water-soluble cutting oil, and as another example, the display device may be configured to include a warning device.

In the above-mentioned second embodiment, in addition to the device that notifies the manager of the water-soluble cutting oil management device 2 of an abnormality in the water-soluble cutting oil when the pH of the water-soluble cutting oil falls outside the set range, for example, a pH adjuster may be supplied to the water-soluble cutting oil management device 2 to adjust the pH.

In the above examples, water-soluble cutting oil has been described, but similar methods can be used with, for example, water-soluble cleaning fluid, and similar effects can be expected. As mentioned above, water-soluble cutting oil and water-soluble cleaning fluid may be included in the coolant fluid.

Although an embodiment of the present invention has been described, this embodiment is presented as an example. Therefore, the contents and/or scope of the invention are not limited. Therefore, this embodiment can be implemented in various other forms, and for example, various omissions, substitutions, and modifications can be made without departing from the gist of the invention. Modifications and modifications of forms that do not depart from the gist of the invention are included in the scope and gist of the invention, and also include a scope equivalent to the invention described in the claims.

LIST OF SYMBOLS 1 Water-soluble cutting oil management device 2 Water-soluble cutting oil management device 10 Circulation section 11 Cutting oil outlet pipe 12 First pump 13 Cutting oil discharge pipe 20 Foreign matter removal filter 30 Oil removal filter 40 Concentration sensor 50 Level gauge 100 Adjustment section 110 Corrected concentration cutting oil supply pipe 120 Second pump 130 Blending section 140 Mixing tank 150 Water supply section 151 Water supply source 152 Water supply path 153 Water flow meter 154 Water on-off valve 160 Concentrate supply section 161 Concentrate tank 162 Concentrate supply path 163 Third pump 164 Concentrate flow meter 165 Concentrate on-off valve 170 Stirring section 200 Control section 300 pH meter 301 pH measurement tank 302 Reference electrode 303 Glass electrode 304 Alarm 400 Coolant tank

Claims (6)

A control unit that manages the concentration of the water-soluble cutting oil stored in the coolant tank;
A pump that sucks the water-soluble cutting oil;
a foreign matter removing filter provided between the coolant tank and the pump to remove foreign matter contained in the water-soluble cutting oil;
an oil removal filter provided between the foreign matter removal filter and the pump, for removing non-emulsified oil contained in the water-soluble cutting oil from which the foreign matter has been removed;
a concentration sensor for measuring the concentration of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed ;
an adjusting unit for adjusting the concentration of the water-soluble cutting oil when the concentration of the water-soluble cutting oil deviates from the control concentration of the water-soluble cutting oil controlled by the control unit ;
Equipped with
The adjusting unit includes a compounding unit that compounds a correction concentration cutting oil having a lower concentration than the control concentration or a correction concentration cutting oil having a higher concentration than the control concentration,
When the concentration of the water-soluble cutting oil measured by the concentration sensor is lower than the control concentration, a high-concentration correction concentration cutting oil is supplied to the water-soluble cutting oil;
When the concentration of the water-soluble cutting oil measured by the concentration sensor is higher than the control concentration, the correction concentration cutting oil having a lower concentration is supplied to the water-soluble cutting oil;
The blending unit is
A mixing tank;
A water supply unit that supplies water to the mixing tank;
a concentrate supply unit that drips the concentrate of the water-soluble cutting oil into the mixing tank in which the water is stored;
a raw liquid flow meter provided in the raw liquid supply unit and configured to measure a flow rate of the raw liquid dropped into the mixing tank;
a stock solution on-off valve provided in the stock solution flow path of the stock solution supply unit, the stock solution on-off valve being closed when the amount of the stock solution dropped into the mixing tank reaches an amount constituting the corrected concentration cutting oil;
a mixing unit that mixes the raw liquid dropped into the mixing tank and/or the water stored in the mixing tank;
Equipped with
A water-soluble cutting oil control device that prepares the corrected concentration cutting oil at a more uniform concentration than would be achieved by natural convection . The water-soluble cutting oil management device according to claim 1 , further comprising a pH meter for measuring a pH of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed. 3. The water-soluble cutting oil management device according to claim 2 , further comprising an alarm that issues a warning when the pH of the water-soluble cutting oil is not within the pH range set by the control unit. A step of inputting the control concentration of the water-soluble cutting oil;
A step of sucking water-soluble cutting oil from a coolant tank;
removing foreign matter contained in the sucked water-soluble cutting oil;
removing non-emulsified oil contained in the water-soluble cutting oil from which the foreign matter has been removed;
Measuring the concentration of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed;
If the concentration of the water-soluble cutting oil is out of the control concentration, adjusting the concentration of the water-soluble cutting oil;
Equipped with
The step of adjusting the concentration of the water-soluble cutting oil includes:
If the measured concentration of the water-soluble cutting oil is lower than the control concentration, a correction concentration cutting oil having a higher concentration than the control concentration is prepared and supplied to the water-soluble cutting oil;
When the measured concentration of the water-soluble cutting oil is higher than the control concentration, the correction concentration cutting oil having a lower concentration than the control concentration is prepared and supplied to the water-soluble cutting oil;
Equipped with
The low concentration correction concentration cutting oil or the high concentration correction concentration cutting oil is prepared by:
Supplying water to a mixing vessel;
Dropping the water-soluble cutting oil stock solution into the mixing tank in which the water is stored;
A step of stirring the dropwise added concentrate and the water stored in the mixing tank;
and mixing the corrected concentration cutting oil at a more uniform concentration than that achieved by natural convection.
Water-soluble cutting oil management method. The method for managing water-soluble cutting oil according to claim 4 , further comprising a step of measuring a pH of the water-soluble cutting oil from which the foreign matter and/or the oil has been removed. A water-soluble cutting oil having a specified concentration range, which is managed by the water-soluble cutting oil management device according to any one of claims 1 to 3 ,
A water-soluble cutting oil in which , when the concentration of the water-soluble cutting oil is lower than a specified range of concentrations, it is mixed with a corrected concentration cutting oil having a higher concentration than the specified concentration, and/ or , when the concentration of the water-soluble cutting oil is higher than the specified range of concentrations, it is mixed with a corrected concentration cutting oil having a lower concentration than the specified concentration, thereby enabling the concentration of the water-soluble cutting oil to be maintained within a specified range.