JP7231900B2 - Floating oil recovery device and water-soluble cutting fluid management system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a floating oil recovery device for keeping water-soluble cutting fluid in a machine tool clean, and technology of a water-soluble cutting fluid management system using the floating oil recovery device.

A cutting fluid is used for purposes such as lubrication and cooling when performing machining using a machine tool. In recent years, water-soluble cutting fluids with excellent cooling performance have been used more and more in order to achieve high machining accuracy.

During the machining operation by the machine tool, the water-soluble cutting fluid is supplied to the portion being machined and collected in the storage tank. When used for a long period of time, the water-soluble cutting fluid is contaminated with lubricating oil from the drive system of the machine tool. As the degree of contamination of the water-soluble cutting fluid progresses, it emits an odor and putrefies. In addition, the degraded water-soluble cutting fluid cannot sufficiently exhibit the desired functions such as lubrication and cooling.

As a device for separating the oil mixed in the water-soluble cutting fluid, there is known a floating oil recovery device for recovering the floating oil floating on the surface of the water-soluble cutting fluid in a storage tank (for example, Patent Document 1). In the floating oil recovery device described in Patent Document 1, a float-type suction port is provided in a water-soluble cutting fluid storage tank, and the surface liquid in the storage tank is taken into the separation tank from the suction port by a suction pump such as a tube pump. . In the separation tank, the water-soluble cutting fluid mixed with oil is separated into floating oil and water-soluble cutting fluid, the floating oil is recovered, and the cleaned water-soluble cutting fluid is returned to the storage tank.

JP-A-8-281255

However, in the floating oil recovery device described in Patent Document 1, the floating oil spread over the entire liquid surface of the water-soluble cutting fluid in the separation tank is sucked out by a single separation pipe, so only the floating oil is efficiently removed. It cannot be recovered separately from the water-soluble cutting fluid. In addition, the amount of water-soluble cutting fluid mixed with the recovered floating oil also increases.

Therefore, in the present invention, the floating oil that floats on the surface of the water-soluble cutting fluid is gathered to separate and recover the floating oil more efficiently, and the water-soluble cutting fluid mixed with the recovered floating oil can be removed. It is an object of the present invention to provide a floating oil collecting device with a small amount of oil.

A floating oil recovery device according to a first aspect of the invention is a floating oil recovery device for separating and recovering floating oil from a water-soluble cutting fluid, the floating oil recovery device having a drip pipe and a floating oil separation chamber. A recovery tank is provided , and the drip pipe intermittently drips water-soluble cutting fluid containing oil onto the liquid surface of the floating oil separation chamber, and the floating oil separation chamber has a cross-sectional area parallel to the horizontal surface that is upward. When the floating oil separation chamber is filled with the water -soluble cutting fluid, the water-soluble cutting fluid dripping from the drip pipe very slowly flows toward the bottom plate and into the floating oil separation chamber. The floating oil separated from the water-soluble cutting fluid while moving is characterized in that the floating oil gathers as it floats upward in the floating oil separating chamber .

The floating oil recovering device according to the first invention can prevent harmful bubbling by adopting a configuration in which the water-soluble cutting fluid is dropped from the dropping pipe. In addition, since the floating oil gathers as it floats upward in the floating oil separation chamber, which is configured such that the area of the cross section parallel to the horizontal surface decreases as it goes upward, the floating oil can be separated more quickly.・It can be recovered, and the amount of water-soluble cutting fluid mixed with the recovered floating oil can be reduced.

A floating oil recovery apparatus according to a second aspect of the present invention includes a drip pipe having a drip opening configured as an elongated hole having a length L and a width W directed downward so that a water-soluble cutting fluid drips toward the liquid surface; a separation and recovery tank formed into a rectangular parallelepiped; a partition wall that separates the interior of the separation and recovery tank into the floating oil separation chamber and the clean liquid chamber; and a communication passage that communicates the floating oil separation chamber and the clean liquid chamber. and, the partition is a rectangular plate having two C-chamfers, the side sandwiched between the C-chamfers is inclined downward, and the C-chamfer and the separation The communication path is formed by the plate surface of the recovery tank.

In the floating oil recovering device according to the second aspect of the invention, the drip port of the drip pipe is formed as an elongated hole, so the water-soluble cutting fluid intermittently drips from the drip port as a large number of water droplets. Thereby, unnecessary foaming can be prevented as much as possible. The dripping of the water-soluble cutting fluid from the drip pipe promotes the separation of the water-soluble cutting fluid from the floating oil contained therein. In addition, the separation and recovery tank, which is formed entirely in the shape of a rectangular parallelepiped, and the partition wall, which is a rectangular plate having two C-chamfers and is inclined with the side sandwiched between the C-chamfers facing downward, floats. Since the oil separation chamber and the communication passage are configured, recovery of the floating oil and reuse of the clean water-soluble cutting fluid can be performed in one compact separation and recovery tank.

A water-soluble cutting fluid management system according to a third aspect of the invention includes a storage tank that temporarily stores water-soluble cutting fluid circulating inside a machine tool , and a water-soluble cutting fluid that floats on the water-soluble cutting fluid inside the storage tank. a floating oil recovery nozzle installed upward near the water surface of the soluble cutting fluid; a diaphragm pump that transfers the water-soluble cutting fluid from the floating oil recovery nozzle to the drip pipe of the separation and recovery tank in an intermittent flow ; and the floating oil recovery device according to claim 2 , wherein the water-soluble cutting fluid containing a large amount of floating oil sucked by the floating oil recovery nozzle near the liquid surface of the storage tank passes through the diaphragm pump. and the clean water-soluble cutting fluid from which the floating oil is separated by the floating oil recovery device is returned from the floating oil recovery device to the storage tank.

According to the water-soluble cutting fluid management system according to the third invention , the water-soluble cutting fluid is transferred by the diaphragm pump intermittently, and the suction nozzle of the floating oil recovery nozzle contains a large amount of floating oil near the liquid surface. Inhale water-soluble cutting fluid. Furthermore, by using the floating oil recovery device according to the second invention , the water-soluble cutting fluid in the storage tank of the machine tool can be kept clean.

According to the present invention, by collecting the floating oil floating on the surface of the water-soluble cutting fluid, the floating oil can be separated and recovered more quickly, and the amount of the water-soluble cutting fluid mixed with the recovered floating oil It is possible to provide a floating oil recovery device and a water-soluble cutting fluid management system with less waste.

1 is a diagram showing a water-soluble cutting fluid management system according to an embodiment of the present invention; FIG. 1 is a front view of a separation and recovery tank of a floating oil recovery device according to an embodiment of the present invention; FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2; FIG. 3 is a detailed view taken along line AA of FIG. 2; It is a C arrow directional view of FIG.

FIG. 1 is a diagram showing a water-soluble cutting fluid management system 1 according to an embodiment of the present invention. 2 is a machine tool to which the water-soluble cutting fluid management system 1 of the present invention is applied. Specifically, it can be applied to all machine tools such as lathes, milling machines, grinders, and machining centers that use water-soluble cutting fluid. 3 is a water-soluble cutting fluid storage tank provided in the machine tool 2 . A water-soluble cutting fluid 4 that circulates inside the machine tool 2 is stored inside the storage tank 3 so as to be supplied to the machining portion.

The floating oil recovery device 5 includes a separation and recovery tank 6 having a floating oil separation chamber 7 . 8 is a liquid pump installed above the separation and recovery tank 6 . In this embodiment, a diaphragm pump 8 is used as the liquid pump. As shown in FIG. 1, a floating oil recovery nozzle 10 floats on the water-soluble cutting fluid 4 inside the storage tank 3 . The floating oil recovery nozzle 10 is constructed by integrating a suction nozzle 11 and three floats 12 . Although two floats 12 are shown in FIG. 1, the other float 12 is omitted. The opening of the suction nozzle 11 is set upward near the water surface 13 of the water-soluble cutting fluid 4 .

The floating oil recovery nozzle 10 and diaphragm pump 8 are connected by a hose 14 . The diaphragm pump 8 and the separation recovery tank 6 are connected by a hose 15 . An air pressure gauge 16 and a manual switching valve 17 are attached to the diaphragm pump 8 . Manual switching valve 17 is connected to air pressure source 19 via hose 18 .

FIG. 2 is a front view of the separation and recovery tank 6. FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2. FIG. Hereinafter, the configuration of the separation/recovery tank 6 will be described with reference to FIGS. 2 and 3. FIG. As is clear from FIGS. 2 and 3, the separation and recovery tank 6 is formed in a rectangular parallelepiped as a whole. Plate materials such as iron and stainless steel are used for each part of the separation and recovery tank 6 . As shown in FIG. 2 , the interior of the separation and recovery tank 6 is separated by a partition wall 20 into a floating oil separation chamber 7 and a clean liquid chamber 22 . As shown in FIG. 3, the bulkhead 20 is composed of a substantially rectangular plate as a whole. The partition wall 20 has two chamfered portions 23 . The partition wall 20 is arranged such that the side 24 sandwiched between the two C-chamfered portions 23 faces downward. The partition wall 20 is inclined at an angle Θ with respect to the bottom plate 25 of the separation and recovery tank 6 . In this embodiment, the angle Θ is approximately 50 degrees.

As is clear from FIG. 2, since the partition wall 20 is arranged at an angle, the floating oil separation chamber 7 is configured such that the area of the cross section parallel to the horizontal plane decreases as it goes upward. In other words, it is configured to become narrower as it goes upward. As shown in FIG. 3 , two communicating paths 27 are formed by the C-chamfered portion 23 of the partition wall 20 and the plate surfaces (bottom plate 25 and body plate 26 ) of the separation and recovery tank 6 . The communication passage 27 communicates the floating oil separation chamber 7 and the cleaning liquid chamber 22 .

As shown in FIG. 1 , the separation and recovery tank 6 is provided with a drip pipe 31 for dripping the water-soluble cutting fluid onto the liquid surface 30 of the floating oil separation chamber 7 . One end of the drip pipe 31 is connected to the diaphragm pump 8 via an elbow pipe joint 32 and a hose 15 . Another elbow pipe joint 32 is connected to the other end of the drip pipe 31 . The opening of the elbow pipe joint faces the liquid surface 30 . As shown in FIG. 2 , the drip pipe 31 is attached through one end plate 33 of the separation and recovery tank 6 .

FIG. 4 is a detailed view taken along the line AA in FIG. 2, showing details of the drip port 34 of the drip tube 31. As shown in FIG. The drip pipe 31 is provided with a drip port 34 configured as an elongated hole of length L×width W. The drip port 34 is directed downward so that the water-soluble cutting fluid drips toward the liquid surface 30 as shown in FIG. It is also possible to change the dripping state of the water-soluble cutting fluid by rotating the dripping tube 31 about its axis from directly downward (for example, about 15 degrees). A water-soluble cutting fluid containing oil tends to generate bubbles. If a large amount of foam is generated, the floating oil cannot be separated from the water-soluble cutting fluid. However, by adopting a configuration in which the water-soluble cutting fluid is dripped from the drip pipe 31 as in the separation and recovery tank 6 of the present embodiment, harmful bubbling can be prevented.

As shown in FIG. 1 , the separation and recovery tank 6 is provided with a recovery pipe 41 for recovering the floating oil 40 floating on the liquid surface 30 of the floating oil separation chamber 7 . As shown in FIG. 2, a pipe joint 42 forming part of the recovery pipe 41 is attached through one end plate 33 of the separation recovery tank 6 . As shown in FIG. 1, a pipe member 44 is attached to a pipe joint 42 via an elbow joint 43 inside the floating oil separation chamber 7 so as to face upward. The opening 45 of the pipe material 44 is higher than the liquid surface 30 and is located in the layer of floating oil 30 . Further, in the recovery pipe 41 , a pipe joint 42 is connected to a manual on-off valve 46 and an elbow joint 43 . The opening of the elbow joint 43 faces downward.

As shown in FIG. 1, the separation/recovery tank 6 is provided with an outflow pipe 53 through which the clean water-soluble cutting fluid 52 flows out from the liquid surface 30 of the clean fluid chamber 22 . As shown in FIG. 2, a pipe joint 54 forming part of the outflow pipe 53 is attached through the other end plate 55 of the separation and recovery tank 6 . As shown in FIG. 1, a pipe member 57 is attached to a piping joint 54 via an elbow joint 56 inside the cleaning liquid chamber 22 so as to face upward. An opening 58 of the pipe member 57 is positioned at the liquid surface 51 . Further, the outflow pipe 53 has a pipe joint 54 connected to a manual on-off valve 60 and an elbow joint 56 . A downward pipe member 61 is connected to the elbow joint 56 . The lower end of the pipe material 61 faces the liquid surface 13 of the storage tank 3 .

5 is a view in the direction of arrow C in FIG. 1. FIG. A viewing window 62 is provided on one end plate 33 of the separation and recovery tank 6 . The inside of the floating oil separating chamber 7 , specifically, the liquid surface 30 and the floating oil 40 can be seen through the observation window 6 . Since the clean liquid chamber 22 and the floating oil separation chamber 7 communicate with each other through the communication passage 27, the liquid surface 51 of the clean liquid chamber 22 is at the same height as the liquid surface 30 of the floating oil separation chamber 7. is.

The functions of the water-soluble cutting fluid management system 1 and the floating oil recovery device 5 according to the embodiment, the configuration of which has been explained above, will be described below by dividing them into a water-soluble cutting fluid cleaning (floating oil gathering) process and a floating oil recovery process. do.

(Water-soluble cutting fluid cleaning (floating oil gathering) process)
The manual on-off valve 46 of the recovery pipe 41 of the separation recovery tank 6 shown in FIG. 1 is kept closed. The manual opening/closing valve 60 of the outflow pipe 53 is left open. In this state, the manual on-off valve 17 of the diaphragm pump 8 is opened to supply air pressure from the air pressure source 19 to the diaphragm pump 8 . At this time, while checking with the air pressure gauge 16, the supply pressure is adjusted to a predetermined value. For example, the supply pressure is 0.1 MPa.

Then, the diaphragm pump 8 starts transferring the water-soluble cutting fluid 4 in the storage tank 3 to the separation/collection tank 6 . The transfer of the water-soluble cutting fluid 4 by the diaphragm pump 8 is an intermittent flow as is well known. More specifically, the suction nozzle 11 of the floating oil recovery nozzle 10 sucks the water-soluble cutting fluid 4 containing a large amount of floating oil near the liquid surface. The water-soluble cutting fluid 4 passes through the hose 14 , the diaphragm pump 8 , and the hose 15 and drips onto the liquid surface 30 of the floating oil separation chamber 7 from the drip pipe 31 .

At this time, since the drip port 34 of the drip pipe 31 is formed as an elongated hole as shown in FIG. do. Thereby, unnecessary foaming can be prevented as much as possible. The dripping of the water-soluble cutting fluid 4 from the drip pipe 31 facilitates the separation of the water-soluble cutting fluid 4 and the floating oil 40 contained therein.

As indicated by the white arrow in FIG. 1, the water-soluble cutting fluid 4 dripped from the drip pipe 31 very slowly moves in the floating oil separation chamber 7 toward the bottom plate 25 (communication passage 27). On the other hand, the floating oil 40 separated from the water-soluble cutting fluid 4 floats in the floating oil separation chamber 7 . The floating oil separation chamber 7 is configured such that the area of the cross section parallel to the horizontal plane decreases as it goes upward (it becomes narrower as it goes up). are gathered. The floating oil 40 gathers above the liquid surface 30 of the floating oil separation chamber 7 in a floating state.

The clean liquid 52 from which the floating oil 40 is separated in the floating oil separation chamber 7 flows into the clean liquid chamber 22 through the communication passage 27 . The cleaning liquid 52 flows into the opening of the outflow pipe 53 , passes through the outflow pipe 53 , and flows out to the storage tank 3 .

Continuing the water-soluble cutting fluid cleaning (floating oil collecting) process described above increases the amount of floating oil 40 floating above the liquid surface 30 in the floating oil separation chamber 7 shown in FIG. The amount of floating oil 40 can be confirmed through the sight glass (see FIG. 5). When the amount of floating oil 40 reaches a certain amount, the next floating oil recovery process is started.

(Floating oil recovery process)
After placing a recovery container for receiving the floating oil 40 under the elbow joint 43 serving as the discharge port of the recovery pipe 41 shown in FIG. 1, the manual on-off valve 46 is opened. Then, the floating oil 40 above the opening 45 of the pipe member 44 of the recovery pipe 41 flows down into the recovery container at once and is recovered.

Next, the manual on-off valve 60 of the outflow pipe 53 is closed while the diaphragm pump 8 is kept operating. Then, since the cleaning liquid 52 does not flow out from the separation and recovery tank 6, the liquid level 30 of the separation and recovery tank 6 (floating oil separation chamber 7) gradually rises. Then, the remaining floating oil 40 flows out to the external collection container through the collection pipe 41 . By monitoring through the viewing window 62 (see FIG. 5), the height of the liquid level 30 can be grasped. When all the floating oil 40 is discharged out of the separation and recovery tank 6, the water-soluble cutting fluid 4 begins to flow out, so it can be understood that the recovery of the floating oil 40 inside the floating oil separation chamber 7 is completed. Thus, the floating oil recovery process is completed. By closing the manual on-off valve 46 of the recovery pipe 41 and opening the manual on-off valve 60 of the outflow pipe 53, the process returns to the water-soluble cutting fluid cleaning (floating oil collecting) step.

As described above, according to the floating oil recovery device 5 and the water-soluble cutting fluid management system 1 according to the embodiment of the present invention, the floating oil 40 floating on the surface of the water-soluble cutting fluid 4 is collected. , the floating oil 40 can be efficiently (quickly) separated and recovered. At that time, the amount of the water-soluble cutting fluid 4 mixed with the recovered floating oil 40 can be reduced. Therefore, the water-soluble cutting fluid 4 in the machine tool 2 can be maintained in a very good condition, so that the original functions of the water-soluble cutting fluid 4, such as lubrication and cooling, can be exhibited stably and continuously. That is, the machining accuracy, machining quality, and machining efficiency of the workpiece by the machine tool 2 can be maintained at a high level. In addition, since the water-soluble cutting fluid 4 can be used for a long period of time, it is possible to reduce the cost and labor required for maintenance and management of the water-soluble cutting fluid 4 .

Furthermore, according to the floating oil recovery device 5 and the water-soluble cutting fluid management system 1 according to the embodiment of the present invention, the water-soluble cutting fluid 4 in the machine tool 2 can be maintained in a very good condition, thus extending the tool life. This enables long-term control of the entire machining process. It also leads to the realization of higher-grade machining and higher-precision machining.

1: Water-soluble cutting fluid management system 4: Water-soluble cutting fluid 5: Floating oil recovery device 6: Separation and recovery tank 7: Floating oil separation chamber 8: Liquid pump (diaphragm pump)
20: partition wall 22: cleaning liquid chamber 23: C-chamfered portion 27: communicating passage 30: liquid surface 31: dripping pipe 34: dripping port 40: floating oil 41: recovery pipe 45: opening 51: liquid surface 58: opening

Claims (3)

A floating oil recovery device for separating and recovering floating oil from a water-soluble cutting fluid,
The floating oil recovery device comprises a separation and recovery tank having a drip pipe and a floating oil separation chamber,
The drip pipe intermittently drips an oil-containing water-soluble cutting fluid onto the liquid surface of the floating oil separation chamber,
The floating oil separation chamber is configured such that the area of the cross section parallel to the horizontal plane decreases upward, and when the floating oil separation chamber is filled with the water-soluble cutting fluid, the water-soluble cutting fluid dripped from the drip tube. While the cutting fluid moves very slowly in the floating oil separation chamber towards the bottom plate,
A floating oil recovering device , wherein the floating oil separated from the water-soluble cutting fluid conversely collects as it floats upward in the floating oil separation chamber . a dripping pipe having a dripping opening configured as an elongated hole of length L×width W directed downward so that the water-soluble cutting fluid drips toward the liquid surface;
the separation and recovery tank having a rectangular parallelepiped shape as a whole;
a partition separating the inside of the separation and recovery tank into the floating oil separation chamber and the cleaning liquid chamber;
a communication passage that communicates between the floating oil separation chamber and the cleaning liquid chamber,
The partition wall is a rectangular plate having two C-chamfered portions, and is inclined with the side sandwiched between the C-chamfered portions facing downward,
2. The floating oil recovering apparatus according to claim 1, wherein the communicating path is formed by the chamfered portion and the plate surface of the separating and recovering tank. a storage tank that temporarily stores the water-soluble cutting fluid that circulates inside the machine tool;
a floating oil recovery nozzle that floats on the water-soluble cutting fluid inside the storage tank and that has an opening of the suction nozzle facing upward near the water surface of the water-soluble cutting fluid;
a diaphragm pump for intermittently transferring the water-soluble cutting fluid from the floating oil recovery nozzle to the drip pipe of the separation and recovery tank;
and a floating oil recovery device according to claim 2 ,
Water-soluble cutting fluid containing a large amount of floating oil sucked by the floating oil recovery nozzle near the liquid surface of the storage tank is sent to the floating oil recovery device via the diaphragm pump,
A water-soluble cutting fluid management system , wherein clean water-soluble cutting fluid from which floating oil is separated by said floating oil recovery device is returned from said floating oil recovery device to said storage tank.

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