Coolant pumping device and cutting system

Abstract

To provide a cutting system capable of greatly reducing foreign matter such as chips and fine powder remaining in a coolant to be reused.SOLUTION: A clean tank configured to store a clean coolant; a pipe configured to take the coolant into the clean tank from a recycle tank into which a dirty liquid flows; a first filter configured to filter the coolant on the pipe; The apparatus further includes a first passage for supplying the coolant having the residue to the recycle tank, a second passage for supplying the coolant separated by the first filter means and having the residue filtered to the clean tank, a third passage for supplying the coolant stored in the clean tank to the coolant spraying means, and pump means provided in the third passage for feeding the coolant stored in the clean tank to the coolant spraying means, wherein the clean tank further includes second filter means for filtering the coolant.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coolant pumping device and a cutting system. [Background technology]

[0002] Conventionally, grinding wheels are made by binding abrasive grains with a binder, so when cutting a workpiece made of a superalloy such as Inconel (registered trademark), clogging occurs. When clogging occurs, a diamond dresser is used to remove one layer of the clogged grinding surface (abrasive grain surface) in order to restore the grinding performance.

[0003] Such grinding wheels are expensive, so there is a demand for them to maintain their grinding ability for as long as possible without being scraped off too much by the diamond dresser.

[0004] Therefore, in order to prevent clogging of the grinding surface of the grinding wheel, it is known to grind the workpiece while spraying high-pressure coolant onto the grinding surface of the grinding wheel (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-70080 Summary of the Invention [Problem to be solved by the invention]

[0006] When cutting a workpiece with a cutting tool, if coolant that has been filtered or otherwise made into a clean liquid is reused as the high-pressure coolant to be sprayed onto the cutting tool, there is an issue that the lifespan of parts such as pressure regulating valves and high-pressure pumps, as well as sealing materials in the piping system, is reduced by foreign matter such as fine chips and shavings that remain in the reused coolant.

[0007] The present invention aims to provide a cutting system that can significantly reduce foreign matter such as fine chips remaining in reused coolant by providing a filter section that removes foreign matter such as fine chips from used coolant, and a coolant pressure-feeding device that pressure-feeds the coolant to a coolant spraying means. [Means for solving the problem]

[0008] A coolant pressure-feeding device according to one aspect of the present invention is a coolant pressure-feeding device that pressure-feeds coolant to a coolant spraying means that sprays the coolant, a clean tank for storing coolant as a clean liquid; piping for taking the coolant into the clean tank from a recycle tank into which coolant as a dirty liquid after use flows; first filter means for filtering the coolant on the piping; a first passage for supplying the coolant separated by the first filter means and having residue to the recycle tank; a second passage for supplying the coolant separated by the first filter means and from which the residue has been filtered to the clean tank; a third passage for supplying the coolant stored in the clean tank to the coolant spraying means; and pump means provided in the third passage for feeding the coolant stored in the clean tank to the coolant spraying means, The clean tank further includes a second filter means for filtering the coolant.

[0009] With this configuration, the coolant pumping device is equipped with a first filter means and a second filter means, and the used coolant is filtered in two stages by the two filter means, performing a double filtering process and significantly reducing foreign matter such as fine chips remaining in the used coolant, thereby suppressing damage to each device and extending its lifespan.

[0010] The coolant pressure-feeding device is characterized in that the first filter means is a cyclone separator.

[0011] This configuration allows the centrifugal force of the cyclone to efficiently separate the used coolant from the remaining residue, such as cutting chips, and eliminates the need for filter replacement.

[0012] The coolant pressure-feeding device is also characterized in that the first filter means is a plurality of mesh filters.

[0013] With this configuration, multiple mesh filters can separate used coolant from cutting chips, etc. Also, by providing multiple mesh filters, if a problem occurs with one mesh filter, operation can be continued using the other mesh filters. Note that the cyclone separator described above is suitable for water-based coolant, and it is preferable to use a mesh filter for oil-based coolant, as oil-based coolant has a lighter specific gravity than water-based coolant.

[0014] In addition, in the coolant pressure-feeding device, the second filter means includes a supply pipe that is open at the top and connected to the third passage, and a filter member that is detachable from the supply pipe, the filter member includes a filter portion that covers the opening of the supply pipe, and a rod portion having a lower end connected to an upper portion of the filter portion and a grip portion at an upper end thereof, The supply pipe has a vertical portion extending vertically at a predetermined height, and when the coolant reaches a predetermined water level, the coolant flows into the supply pipe from the opening at the upper end through the filter portion.

[0015] With this configuration, the coolant filtered by the first filter means is further filtered by the filter member of the second filter means, making the coolant cleaner.In addition, the filter member can be easily removed, improving maintainability.

[0016] Furthermore, this coolant pressure-feeding device is characterized in that the filter section has a first filter and a second filter arranged opposite each other at a predetermined distance, and a peripheral wall section connecting the first filter and the second filter, and a space section surrounded by the first filter, the second filter, and the peripheral wall section is formed inside.

[0017] According to this configuration, the filter member includes a first filter and a second filter, which improves the filterability of the coolant. Furthermore, by forming a space inside and configuring the filter with multiple filters, the filtering time can be shortened compared to when a single thick filter is used. It is also possible to configure the filter with two or more filters by adding an additional filter to the space.

[0018] Furthermore, in this coolant pressure-feeding device, an opening of the supply pipe is positioned in the space of the filter member when the filter member is attached to the supply pipe.

[0019] With this configuration, the opening at the upper end of the supply pipe is located in the space of the filter section, so that the coolant passes through at least one of the first filter or the second filter before flowing into the supply pipe. This ensures that the coolant flowing into the supply pipe passes through the filter, ensuring that the coolant is filtered by the filter.

[0020] Furthermore, this coolant pressure-feeding device is characterized in that the clean tank further has a third filter means, the third filter means having a cylindrical guide portion that surrounds the periphery of the second filter means, and a predetermined gap is formed between the lower end of the guide portion and the floor surface of the clean tank on which the third filter means is disposed, and the coolant is filtered by the gap.

[0021] According to this configuration, by providing the third filter means in addition to the first and second filter means, the filterability of the coolant can be further improved, resulting in a cleaner coolant. In addition, the third filter means also functions as a guide for supplying the coolant to the supply pipe of the second filter means, improving the supplyability of the coolant.

[0022] Furthermore, this coolant pressure-feeding device is characterized in that the first filter means comprises a first discharge section that discharges the coolant from which the separated and filtered residues have been removed, and a switching valve provided in the first discharge section, and the switching valve is switchable between a first position in which the coolant from the first discharge section flows into the dirty tank, and a second position in which the coolant from the first discharge section flows into the clean tank section.

[0023] According to this configuration, even if the first filter means does not sufficiently filter the used coolant, the separated coolant can be prevented from being supplied to the clean tank.

[0024] Furthermore, this coolant pressure-feeding device is characterized in that the switching valve is kept in the first position until a certain time has elapsed after the start switch of the first filter means is pressed, and is controlled to the second position after the certain time has elapsed.

[0025] With this configuration, even if the first filter means has not sufficiently filtered the used coolant, the separated coolant can be prevented from being supplied to the clean tank, and it is possible to control the supply of coolant in a sufficiently filtered state. This operation can also be automated.

[0026] Furthermore, this coolant pressure-feeding device is characterized in that the first filter means further has a second discharge section that discharges coolant containing residue, and the second discharge section is connected to a passage that flows the coolant into the recycle tank.

[0027] According to this configuration, even if the first filter means does not sufficiently filter the used coolant, the used coolant can be reliably prevented from flowing into the clean tank portion.

[0028] One aspect of the cutting system of the present invention is a cutting system that cuts a workpiece using a cutting tool, and is equipped with any of the coolant pressure-feeding devices described above, a coolant spraying means that is connected to the coolant pressure-feeding device through piping and sprays coolant at high pressure onto the cutting portion, and the recycling tank that stores used coolant and cutting chips, and is characterized in that the coolant is used to finely chop the cutting chips of the workpiece during cutting.

[0029] This configuration significantly reduces cutting debris from the coolant after use, and allows the used coolant to be reused as clean coolant for use with the coolant spraying means, thereby reducing damage to each device and extending its lifespan.

[0030] The cutting system is also characterized in that the recycle tank has a filtering section that separates the used coolant from the cutting chips.

[0031] According to this configuration, the used coolant can also be filtered in the recycle tank, allowing it to be reused as an even cleaner coolant.

[0032] The cutting system is also characterized in that the filtering section has a conveyor that discharges cutting chips in the used coolant into a chip basket.

[0033] According to this configuration, cutting chips in the used coolant are separated by the belt conveyor and discharged into the chip basket, thereby making it possible to remove the cutting chips from the used coolant.

[0034] The cutting system is also characterized by having a second filtering section that further filters the coolant that has passed through the filtering section.

[0035] This configuration allows for reuse of the coolant as an even cleaner product. The second filtering means can be, for example, a partition wall or mesh filter with small gaps that allow the coolant to pass through but not the cutting chips. [Effects of the Invention]

[0036] The present invention can filter used coolant in at least two stages using first and second filter means, making it possible to reuse cleaner coolant than before. This reduces residue such as cutting chips remaining in used coolant and extends the life of mechanisms such as high-pressure pumps and pressure adjustment valves, as well as sealing resin rubber. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is a conceptual diagram illustrating a cutting system according to an embodiment of the present invention. [Figure 2] 1 is a diagram showing a coolant pressure-feeding device according to an embodiment of the present invention; [Figure 3] FIG. 3 is an explanatory diagram of a first filter means. [Figure 4] FIG. 10 is a view of the second filter means as seen from above. [Figure 5] FIG. 10 is a view showing a state in which the filter member of the second filter means is removed from the supply pipe. [Figure 6] FIG. 2(a) is a side view of the filter member, and FIG. 2(b) is a bottom view. [Figure 7] FIG. 10 is a side view of the filter member attached to the supply pipe. DETAILED DESCRIPTION OF THE INVENTION

[0038] A cutting system according to one embodiment of the present invention will be described in detail below. However, the present invention is not limited to this embodiment. Furthermore, the components in the following embodiment include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Furthermore, the configurations described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configuration can be made without departing from the spirit of the present invention.

[0039] <1. Cutting system configuration> Fig. 1 is a diagram showing a cutting system according to an embodiment of the present invention. As shown in Fig. 1, the cutting system 1 mainly comprises a cutting machine 3 equipped with a cutting tool 3a for cutting a workpiece, a coolant spraying means 4, a recycle tank 5, and a coolant pressure-feeding device 10.

[0040] The cutting system 1 cuts a workpiece with a cutting tool 3a, and during cutting, high-pressure coolant is sprayed toward the vicinity of where the cutting tool 3a cuts the workpiece by a coolant spraying means 4. By spraying the coolant in this area, not only is the cutting tool 3a cooled, but cutting chips produced from the cut workpiece are also cut by the high-pressure coolant.

[0041] Coolant is supplied to the coolant spraying means 4 from a coolant pressure feed device 10, and coolant stored in a clean tank 13 is supplied by a high-pressure pump 14 via a pressure adjustment valve 9, and high-pressure coolant is sprayed from the nozzle 4a. The high-pressure pump 14 may be, for example, a plunger pump.

[0042] The used coolant sprayed from the nozzle 4a is discharged into the dirty tank section 5A of the recycle tank 5 together with cutting chips from the workpiece. The recycle tank 5 has a dirty tank section 5A and a clean tank section 5B, which are separated by a partition wall 5C. The partition wall 5C is provided so that a predetermined gap is formed between its lower end and the floor of the recycle tank 5, and the dirty tank section 5A and the clean tank section 5B communicate with each other through the gap at the bottom of the partition wall 5C. The partition wall 5C is not limited to a partition wall with a gap at the bottom, and may also be configured to filter the water as a mesh filter.

[0043] Furthermore, a transport conveyor 51 is provided in the dirty tank section 5A of the recycle tank 5 to transport cutting chips to a waste box 52. The used coolant is configured to be discharged onto the transport conveyor 51 of the dirty tank section 5A, and the cutting chips in the used coolant are placed on the transport conveyor 51 and discharged into the waste box 52. This allows larger cutting chips to be removed from the used coolant.

[0044] In the recycle tank 5, used coolant flows from the dirty tank section 5A to the clean tank section 5B through a gap at the bottom of the partition wall 5C. When the used coolant passes through the gap at the bottom of the partition wall 5C, cutting chips in the coolant are also removed. Note that a mesh filter, for example, can be provided in the gap of the partition wall 5C to further improve the removal of cutting chips.

[0045] The coolant is filtered in two stages by the transfer conveyor 51 and the partition wall 5C and flows into the clean tank section 5B, and is then supplied to the cyclone separator 12 of the coolant pressure-feeding device 10 by the pump 6 through piping.

[0046] <2. Coolant pressure feeding device configuration> Next, the configuration of the coolant pressure-feeding device 10 will be described. Fig. 2 is a diagram showing the coolant pressure-feeding device according to this embodiment. Fig. 3 is an explanatory diagram of a first filter means provided in the coolant pressure-feeding device. Fig. 4 is a diagram showing the second filter means as viewed from above. Fig. 5 is a diagram showing the filter member of the second filter means removed from the supply pipe. Fig. 6(a) is a side view of the filter member, and (b) is a bottom view. Fig. 7 is a side view of the filter member attached to the supply pipe.

[0047] 1 and 2, the coolant pressure-feeding device 10 mainly comprises a control unit 11, a cyclone separator 12, a clean tank 13, and a pump 14. Used coolant supplied to the coolant pressure-feeding device 10 from the recycle tank 5 is filtered as it passes through the cyclone separator 12 and the clean tank 13, and is supplied to the coolant spraying means 4 via the pump 14.

[0048] (First filter means) Cyclone separator 12, which is the first filtering means, is a first filtering means that filters the coolant and is provided with first discharge section 12A at the top and second discharge section 12B and sludge pot 12C at the bottom for accommodating cutting chips and the like in the coolant. Also, cyclone separator 12 is connected to a pipe that supplies used coolant from recycle tank 5, and cyclone separator 12 filters the coolant.

[0049] As shown in Figure 3, the cyclone separator 12 is conical in shape, and generates a swirling flow inside it, causing cutting chips and other debris in the coolant to be subjected to centrifugal force and collect on the peripheral wall, then fall into the sludge pot 12C below along with some of the coolant and are collected there.

[0050] Meanwhile, the swirling flow in the cyclone separator 12 causes the filtered coolant to rise and be sent to the first discharge section 12A side, which will be described later. Note that the filtration by the cyclone separator 12 is excellent for filtering fine powder with a particle size of more than 10 microns, so it is also sufficiently effective for cutting chips and the like that are larger than this.

[0051] A bifurcated pipe is connected to first discharge section 12A of cyclone separator 12 via electromagnetic switching valve 15. This pipe includes passage 19A (first passage) through which the coolant that has passed through cyclone separator 12 is returned to recycle tank 5, and passage 19B through which the coolant is sent to clean tank 13.

[0052] Electromagnetic switching valve 15 is switchable between a first position where it flows into passage 19A on the recycle tank 5 side, and a second position where it flows into passage 19B on the clean tank 13 side. Electromagnetic switching valve 15 is connected to control unit 11, which measures the time from when the start switch for cyclone separator 12 is pressed, and keeps the valve in the first position on the recycle tank 5 side until a certain time has elapsed since the start switch was pressed.

[0053] After a certain period of time has passed, the coolant is filtered and the cyclone separator 12 is moved to the second position toward the clean tank 13. After the cutting of the workpiece is completed, the cyclone separator 12 is moved to the first position again from the time the stop switch is pressed until the cyclone separator 12 is stopped.

[0054] Immediately after starting or immediately before stopping the cyclone separator 12, the filtration of the coolant by the cyclone separator 12 may not be performed stably and smoothly, so the coolant discharged from the first discharge part 12A is made to flow to the recycle tank 5 side, not to the clean tank 13 side.

[0055] On the other hand, after a certain time has passed since the start of the cyclone separator 12, the coolant is effectively filtered, so the electromagnetic switching valve 15 is set to the second position so that the filtered coolant flows to the clean tank 13 side.

[0056] The above control is realized by the control unit 11, which automatically controls the first position and the second position of the electromagnetic switching valve 15 depending on the time from the start of operation of the cyclone separator 12, but the operator can also manually control it. The control unit 11 is equipped with a CPU, memory, storage devices such as SSD and HDD, output devices, input devices, etc. (not shown) to realize the above control.

[0057] In this way, the coolant that has been sufficiently filtered by the cyclone separator 12 flows into the clean tank 13 via the first discharge part 12A and the electromagnetic switching valve 15. Next, the clean tank 13 will be described.

[0058] (Second filter means) 1, 4, and 5, the clean tank 13 mainly comprises a seating portion 16A constituting the second filter means, a supply pipe 16B connected to the seating portion 16A and having an open top and connected to the high-pressure pump 4, and a filter member 17 connected to the top of the supply pipe 16B. An opening through which the supply pipe 16B passes is formed in the seating portion 16A.

[0059] The supply pipe 16B has a vertical portion 16Ba extending vertically and a horizontal portion 16Bb bending from the vertical portion 16Ba and extending horizontally. An end of the horizontal portion 16Bb is connected to the high-pressure pump 14.

[0060] 6, filter member 17 has a disk-shaped filter portion 17A that covers supply pipe 16B from above, and rod portion 17B whose lower end is connected to the upper portion of filter portion 17A and whose upper end is provided with grip portion 17C. An operator can hold grip portion 17C to easily attach and detach filter member 17 to and from supply pipe 16B.

[0061] The disk-shaped filter portion 17A of the filter member 17 has an upper first filter 17Aa, a lower second filter 17Ab, and a peripheral wall portion 17Ac connecting these together, and a space surrounded by these is formed inside.

[0062] 7, when filter member 17 is attached to supply pipe 16B, the opening of supply pipe 16B is located in the space of filter section 17A. As a result, the coolant passes through at least one of first filter 17Aa and second filter 17Ab before flowing into supply pipe 16B, and the coolant flowing into supply pipe 16B passes through one of the filters, ensuring that the coolant is filtered.

[0063] The seating portion 16A, the vertical portion 16Ba of the supply pipe 16B, and the filter member 17 are covered by a cylindrical guide member 18. The guide member 18 is provided so that a predetermined gap is formed between its lower end and the bottom surface of the clean tank 13, and the coolant flows into the guide member 18 through this gap. As the coolant passes through this gap, cutting chips in the coolant are further filtered and removed. Note that a mesh filter, for example, may be further provided in this gap to improve filtering.

[0064] In addition, in this embodiment, guide member 18 is configured by, for example, a metal plate erected so as to have a hexagonal cylindrical shape when viewed from above, but it may be configured in any shape other than a hexagonal cylindrical shape, such as a polygonal cylindrical shape, or a cylindrical shape, as long as it conforms to the outer shape of filter portion 17A of filter member 17. By configuring it in this manner, coolant can be guided to smoothly flow into supply pipe 16B via filter portion 17A. Then, the coolant that flows into supply pipe 16B is supplied to coolant spraying means 4 through passage 19C (third passage) by pump 14.

[0065] Note that reference numeral 21 denotes a manual on-off valve that is set to the open position during operation, and reference numeral 22 denotes a pressure gauge that measures the pressure of the coolant being supplied. Reference numeral 23 denotes a liquid level tower that detects the liquid level of the coolant in the clean tank 13 and is used to maintain a constant liquid level in the clean tank 13. Reference numeral 24 denotes a chiller (temperature control device) that keeps the coolant temperature constant. Reference numeral 7 denotes a mist collector that sucks in and removes oil mist that is generated during cutting.

[0066] <3. Reusing coolant> According to the cutting system 1 equipped with the coolant pressure-feeding device 10 of this embodiment having the above-described configuration, when a workpiece is cut with the cutting tool 3a, the coolant spraying means 4 can spray high-pressure coolant near the cutting point of the cutting tool 3a while cutting the workpiece. The high-pressure coolant is sprayed at a pressure of 7 to 20 MPa near the cutting point of the cutting tool 3a from a distance of approximately 1 to 5 mm. This high-pressure coolant cools the cutting tool 3a and washes away cutting chips from the workpiece while cutting them, allowing the cutting process to be carried out.

[0067] The coolant sprayed from the coolant spraying means 4 toward the vicinity of the machining point of the cutting tool 3a is then discharged together with the cutting chips into the dirty tank section 5A of the recycle tank 5. The discharged coolant and cutting chips are discharged onto the transport conveyor 51 of the dirty tank section 5A, and the cutting chips in the coolant are discharged by the transport conveyor 51 into a waste box 52, thereby removing larger cutting chips from the coolant.

[0068] As the coolant passes through the gap at the bottom of partition wall 5C, cutting chips in the coolant are further removed and the coolant flows into clean tank section 5B. The coolant that has flowed into clean tank section 5B is supplied to cyclone separator 12 of coolant pressure-feeding device 10 by pump 6 through piping.

[0069] Then, the cyclone separator 12 further separates the cutting chips in the coolant, and the cutting chips and some of the coolant are further removed, and the cleaner coolant is sent to the clean tank 13 of the coolant pressure-feeding device 10.

[0070] The coolant then passes through the gap between the lower end of the guide member 18 around the filter member 17 and the bottom surface of the clean tank 13, where cutting debris is further removed before flowing into the guide member 18. The coolant then passes through the upper first filter 17Aa and / or the lower second filter 17Ab, and the coolant, now in an even cleaner state, flows into the filter member 17 and into the supply pipe 16B from the upper opening.

[0071] The clean coolant that has flowed into the supply pipe 16B is passed through the passage 19C by the pump 14, and is sprayed again at high pressure by the coolant spraying means 4, so that it is reused.

[0072] As described above, the coolant pressure-feeding device 10 of this embodiment and the cutting system 1 equipped with it can reuse coolant in a cleaner state than before by filtering it multiple times. If insufficiently filtered coolant is used, fine cutting debris may remain, drastically reducing the lifespan of parts such as pumps and valves, and sealing materials in the piping system. However, this embodiment can significantly reduce this. In particular, in the case of a configuration that sprays high-pressure coolant as in this embodiment, using a high-pressure pump, this is even more effective.

[0073] <4. Other embodiments> Although the preferred embodiments of the present invention have been described above with reference to the drawings, various additions, modifications, and omissions can be made without departing from the spirit of the present invention. Therefore, such additions, modifications, and omissions are also included in the scope of the present invention.

[0074] For example, although not specifically shown in the present embodiment, newly supplied water and chemicals from the chemical tank are taken in by an ejector and supplied as new coolant to the clean tank 13. That is, in the present embodiment, as an example, the clean tank 13 is configured to store a mixture of new coolant and coolant that has been filtered multiple times to a clean state, but it may also be configured to use only coolant that has been filtered multiple times to a clean state without using new coolant.

[0075] In this embodiment, a cyclone filter is used as the first filter means, but a configuration with multiple mesh filters is also possible. By providing multiple mesh filters, if a malfunction occurs in one mesh filter, operation can be continued using the other mesh filters, and the mesh filter cartridge can be replaced during that time. Note that mesh filters are preferable when the coolant is oil-based. [Explanation of symbols]

[0076] 1 Cutting System 3 Cutting machine 3a cutting tools 4 Coolant spraying means 4a nozzle 5. Recycling Tank 5A Dirty Tank 5B Clean Tank Section 5C Partition wall 6. Pump 7. Mist Collector 10 Coolant pressure supply device 11 Control section 12 Cyclone separator 12A 1st discharge section 12B 2nd discharge section 12C Sludge Pot 13 Clean Tank 14 Pump 15 Electromagnetic switching valve 16A Seating area 16B Supply pipe 16Ba vertical section 16Bb horizontal part 17 Filter material 17A Filter section 17Aa 1st filter 17Ab 2nd filter 17Ac Peripheral wall part 17B Rod part 17C Grip 18 Guide member 19A aisle Aisle 19B 19C aisle 20 Pressure Regulating Valve 21 Manual on-off valve 22 Pressure gauge 23 Level Tower 24 Chiller

Claims

1. a coolant pressure-feeding device that pressure-feeds coolant to a coolant spraying means that sprays the coolant; A clean tank that stores coolant, which is a clean liquid; A pipe for taking in the coolant from a recycle tank into which the coolant, which is a dirty liquid after use, flows into the clean tank; a first filter means for filtering the coolant on the pipe; a first passage for supplying the coolant having residue separated by the first filter means to the recycle tank; a second passage for supplying the coolant separated by the first filter means and filtered of residues to the clean tank; a third passage for supplying the coolant stored in the clean tank to the coolant spraying means; a pump means provided in the third passage for supplying the coolant stored in the clean tank to the coolant spray means, The clean tank further includes a second filter means for filtering the coolant. Coolant pressure supply device.

2. The first filter means is a cyclone separator.

2. The coolant pressure-feeding device according to claim 1.

3. The first filter means is a plurality of mesh filters.

2. The coolant pressure-feeding device according to claim 1.

4. The second filter means a supply pipe that is open at the top and connected to the third passage; a removable filter member in the supply pipe; The filter member is a filter portion that covers an opening of the supply pipe; a rod portion having a lower end connected to the upper portion of the filter portion and a grip portion at an upper end thereof; The supply pipe has a vertical portion extending vertically at a predetermined height, and when the coolant reaches a predetermined water level, the coolant flows into the supply pipe from the opening at the upper end through the filter portion.

2. The coolant pressure-feeding device according to claim 1.

5. The filter unit includes: a first filter and a second filter arranged opposite each other with a predetermined distance between them; a peripheral wall portion connecting the first filter and the second filter, a space surrounded by the first filter, the second filter, and the peripheral wall portion is formed inside the filter; 5. The coolant pressure-feeding device according to claim 4.

6. With the filter member attached to the supply pipe, an opening of the supply pipe is located in the space of the filter section, 6. The coolant pressure-feeding device according to claim 5.

7. the clean tank section further includes a third filter means, The third filter means a cylindrical guide portion surrounding the second filter means; a predetermined gap is formed between a lower end of the guide portion and a floor surface of the clean tank on which the third filter means is disposed, The coolant is filtered by the gap.

5. The coolant pressure-feeding device according to claim 4.

8. The first filter means a first discharge section for discharging the separated coolant from which the residue has been filtered; a switching valve provided in the first discharge section, The switching valve is switchable between a first position where the coolant from the first discharge part flows into the recycle tank and a second position where the coolant from the first discharge part flows into the clean tank part.

3. The coolant pressure-feeding device according to claim 2.

9. The switching valve is The first filter means is kept in the first position until a predetermined time has elapsed since the start switch of the first filter means is pressed, and is controlled to the second position after the predetermined time has elapsed.

6. The coolant pressure-feeding device according to claim 5.

10. The first filter means The coolant supply system further includes a second discharge section for discharging the coolant containing the residue. The second discharge section is connected to a passage leading to the recycle tank, 2. The coolant pressure-feeding device according to claim 1.

11. A cutting system that cuts a workpiece using a cutting tool, The coolant pressure-feeding device according to any one of claims 1 to 10, a coolant spraying means connected to the coolant pressure feeding device through a pipe and spraying coolant at high pressure onto the cutting portion; the recycle tank in which used coolant and cutting chips are stored, During cutting, the coolant is used to finely chop the cutting chips of the workpiece. Cutting system.

12. The recycling tank is It is characterized by having a filtration section that separates used coolant from cutting chips. The cutting system of claim 11.

13. The filtration section is The coolant is then cooled to a temperature of 100°C / 240°F. The cutting system of claim 10.

14. The coolant passing through the filtration section is further filtered by a second filtration section. The cutting system of claim 11.

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