Cutting fluid filter, cutting fluid filtration method, cutting fluid filtration system, and valve stack

Abstract

This invention provides a cutting fluid filter with a simple structure that effectively suppresses the growth of bacteria in the cutting fluid. [Solution] The cutting and polishing fluid filter 101 according to this disclosure comprises a box body 1, a mesh body 3, and a metal fine fragment aggregate 5. The box body 1 has openings 7 on both its top and bottom surfaces. The mesh body 3 covers both openings 7. The metal fine fragment aggregate 5 is an aggregate of metal fine fragments contained within the box body 1, with its outflow prevented by the mesh body 3. The metal fine fragment aggregate 5 is, for example, metal powder, granules, or cutting chips. The metal constituting the metal fine fragment aggregate 5 is a heavy metal that exhibits bactericidal properties by ionizing in water, such as copper, silver, platinum, or tin.

Description

Technical Field

[0005]

[0001] The present invention relates to a cutting and grinding fluid filter, a cutting and grinding fluid filtering method, a cutting and grinding fluid filtering system, and a valve laminate suitable for use in the cutting and grinding fluid filtering system, which aim to prevent the generation of abnormal odor of a water-soluble cutting and grinding fluid used in a metal processing machine and increase its lifespan.

Background Art

[0002] In this specification, the term "cutting and grinding" is used as a general term for cutting and grinding. In metal processing machines such as lathes, milling machines, and ball mills, a cutting and grinding fluid is used as a coolant to suppress the temperature rise and burning of the workpiece and the cutting and grinding tool. The cutting and grinding fluid ejected onto the processing site by a nozzle flows downward together with the cutting and grinding chips and is stored in a tank provided at the bottom of the machine. The cutting and grinding chips are conveyed by a mesh conveyor and collected in a cutting and grinding chip disposal container prepared outside the machine. The cutting and grinding fluid is pumped up and supplied to the nozzle again. Thus, the cutting and grinding fluid is used cyclically.

[0003] The cutting and grinding fluid is used after being diluted to 5 - 10% with tap water. When the machine stops and the circulation of the cutting and grinding fluid stops, and it remains in the tank, the cutting and grinding fluid starts to emit an abnormal odor in about one week. This abnormal odor is caused by the reproduction of bacteria that eat and decompose the organic components of the cutting and grinding fluid. When the bacteria reproduce, not only does an abnormal odor occur, but the pH of the fluid also drops and becomes acidic, which can also cause the machine to rust.

[0004] A method of sterilizing bacteria by mixing a chemical agent is known, but there is a problem that the chemical agent affects the properties of the cutting and grinding fluid. In contrast, Patent Document 1 discloses a technique for suppressing spoilage by passing a water-soluble cutting fluid through copper cutting chips.

[0005] However, the technology disclosed in Patent Document 1 relates to a mixed liquid separation device whose primary purpose is to separate lubricating oils such as machine oil mixed in with cutting fluid. Therefore, the outlet for discharging the separated liquid from this separation device is located near the surface of the mixed liquid. As a result, relatively light lubricating oil preferentially flows out of the outlet, while relatively heavy cutting oil remains in the separation device for a long time. Consequently, even though the cutting fluid is in a state where it can come into contact with copper chips, the problem remains that bacteria are still likely to grow in the cutting fluid. Furthermore, it has also been pointed out that the mixed liquid separation device disclosed in Patent Document 1 has the problem of having a complex structure. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 5099734 [Overview of the initiative] [Problems that the invention aims to solve]

[0007] The present invention has been made in view of the above-mentioned problems, and aims to provide a cutting and polishing fluid filter with a simple structure that effectively suppresses the growth of bacteria in the cutting and polishing fluid, a cutting and polishing fluid filtration method using the cutting and polishing fluid filter, a cutting and polishing fluid filtration system having the cutting and polishing fluid filter, and a valve laminate suitable for use in the cutting and polishing fluid filtration system. [Means for solving the problem]

[0008] To achieve the above objective, a first aspect of the present invention provides a cutting and polishing fluid filter comprising: a box having openings on its top and bottom surfaces; a mesh covering the openings on the top and bottom surfaces; and an aggregate of fine metal fragments contained within the box, with the outflow prevented by the mesh. Furthermore, the metal is a heavy metal that exhibits bactericidal properties by ionizing in water.

[0009] This configuration results in a simple structure for the cutting and polishing fluid filter. To use this filter, a water-soluble cutting and polishing fluid is flowed from the top to the bottom of the filter through the mesh opening. This causes the cutting and polishing fluid to come into contact with the surface of countless tiny particles of heavy metal contained within the filter body, and bactericidal heavy ions dissolve into the cutting and polishing fluid. Since the cutting and polishing fluid passes through the filter without accumulating, the growth of bacteria in the cutting and polishing fluid is effectively suppressed. The mesh on the top surface not only prevents the outflow of metal particles but also prevents the inflow of cutting and polishing debris contained in the incoming cutting and polishing fluid. Examples of metal particles include metal powder, granules, or cutting debris.

[0010] A second aspect of the present invention is a cutting and polishing fluid filter according to the first aspect, wherein the metal fine fragments are copper cutting chips.

[0011] This configuration uses relatively inexpensive and highly bactericidal copper as the heavy metal that exhibits bactericidal properties by ionizing in water, and uses cutting chips as the fine fragments, thus realizing an inexpensive filter that effectively suppresses the growth of bacteria in the cutting and polishing fluid.

[0012] A third aspect of the present invention is a method for filtering cutting and polishing fluid, wherein a cutting and polishing fluid filter according to the first or second aspect is installed between the processing part of a metalworking machine and a tank located below it that temporarily stores the cutting and polishing fluid flowing down from the processing part, so that the flowing cutting and polishing fluid flows from the upper surface to the lower surface of the cutting and polishing fluid filter through the opening.

[0013] In this configuration, bactericidal heavy ions dissolve into the cutting and polishing fluid that flows from the workpiece. The cutting and polishing fluid, which is temporarily stored in the tank, is circulated and supplied back to the workpiece, so the growth of bacteria in the cutting and polishing fluid is effectively suppressed even within the tank.

[0014] A fourth aspect of the present invention is a cutting and polishing fluid filtration method, comprising: installing a cutting and polishing fluid filter according to the first or second aspect; and flowing the cutting and polishing fluid, which is stored in a tank located below the processing area of ​​a metalworking machine and which temporarily stores the cutting and polishing fluid flowing down from the processing area, from the upper surface to the lower surface of the cutting and polishing fluid filter through the opening, and returning the cutting and polishing fluid flowing out through the opening on the lower surface to the tank.

[0015] With this configuration, the cutting and polishing fluid that flows out from the processed area and is temporarily stored in the tank is circulated so that it passes through the cutting and polishing fluid filter, effectively suppressing the growth of bacteria in the cutting and polishing fluid stored in the tank.

[0016] A fifth aspect of the present invention is a cutting and polishing fluid filtration method, comprising: installing a cutting and polishing fluid filter according to the first or second aspect at a position where a nozzle that sprays cutting and polishing fluid onto a workpiece receives the cutting and polishing fluid during maintenance of a metalworking machine; and circulating the cutting and polishing fluid stored in a tank located below the workpiece, which temporarily stores the cutting and polishing fluid flowing down from the workpiece, and spraying it from the nozzle. As a result, the cutting and polishing fluid sprayed from the nozzle flows from the upper surface to the lower surface of the cutting and polishing fluid filter through the opening.

[0017] With this configuration, when maintaining metalworking machinery that is not performing metal processing, the cutting and polishing fluid is circulated to pass through the cutting and polishing fluid filter, effectively suppressing the growth of bacteria in the cutting and polishing fluid.

[0018] A sixth aspect of the present invention is a cutting and polishing fluid filtration system located below a machining area of ​​a metalworking machine, which filters the cutting and polishing fluid stored in a tank that temporarily stores the cutting and polishing fluid flowing down from the machining area, comprising: a cutting and polishing fluid filter according to the first or second aspect; and a circulation path that flows the cutting and polishing fluid stored in the tank from the upper surface to the lower surface of the cutting and polishing fluid filter through an opening, and returns the cutting and polishing fluid flowing out through the opening on the lower surface to the tank. The circulation path has a mesh filter, a diaphragm pump, a flow smoother, and a cyclone filter in order along the flow from the tank to the upper surface of the cutting and polishing fluid filter. The mesh filter functions as a primary filter that removes relatively large cutting and polishing debris contained in the circulating cutting and polishing fluid. The diaphragm pump functions as a pump that circulates the cutting and polishing fluid. The flow smoother smooths the pulsation of the cutting and polishing fluid circulated by the diaphragm pump. The cyclone filter functions as a secondary filter that removes relatively small cutting and polishing debris contained in the circulating cutting and polishing fluid.

[0019] With this configuration, the cutting fluid that flows from the machining area and is temporarily stored in the tank circulates through the cutting fluid filter, effectively suppressing the growth of bacteria in the cutting fluid stored in the tank. In addition, relatively small cutting debris is removed by the cyclone filter in the circulation path before the cutting fluid is supplied to the cutting fluid filter, thus suppressing clogging of the filter. Furthermore, relatively large cutting debris is removed by the mesh filter before the cutting fluid is sent to the diaphragm pump, flow smoother, and cyclone filter, thus suppressing malfunctions of these devices due to relatively large cutting debris. Moreover, since a diaphragm pump is used, the circulation path is highly sealed and less prone to malfunction. Furthermore, despite the use of a diaphragm pump, the pulsation of the flow rate of the circulating cutting fluid is suppressed by the flow smoother, so the operation of the cyclone filter is not hindered. For example, a damper or a Tesla valve can be used as the flow smoother.

[0020] A seventh aspect of the present invention is a cutting and polishing fluid filtration system according to the sixth aspect, wherein the flow smoother has a valve stack in which multiple stages of valve units, each having a Tesla valve extending along a single axis, are stacked. The inlet of the Tesla valve opens at the bottom surface of one end of each valve unit along the single axis, and the outlet of the Tesla valve opens at the top surface of the other end. The valve stack achieves cascaded connection of Tesla valves by stacking the upper valve units on top of the lower valve units, with the orientation of the upper valve units along the single axis reversed from that of the lower valve units, so that the outlet of the lower valve unit communicates with the inlet of the upper valve unit.

[0021] This configuration improves the smoothing effect because the flow smoother has cascaded Tesla valves. Moreover, since the Tesla valves are cascaded along an axis perpendicular to the axis rather than along a single axis, the total length of the cascaded Tesla valves is reduced. In this configuration, "top surface" and "bottom surface" refer to the surface where the forward inlet of the Tesla valve opens as the "bottom surface" and the surface where the outlet opens as the "top surface" for convenience, and are not intended to limit the orientation in which the valve stack is used.

[0022] An eighth aspect of the present invention is a valve stack comprising a plurality of stacked valve units, each having a Tesla valve extending along a single axis, wherein the inlet of the Tesla valve is opened at the bottom surface of one end of each valve unit along the single axis, and the outlet of the Tesla valve is opened at the top surface of the other end. Furthermore, the valve stack achieves cascaded connection of Tesla valves by stacking the upper valve units on top of the lower valve units, with the orientation of the upper valve units along the single axis reversed from that of the lower valve units, so that the outlet of the lower valve unit communicates with the inlet of the upper valve unit.

[0023] In this configuration, the Tesla valves are connected in cascaded order, improving their smoothing and backflow prevention effects. Furthermore, since the Tesla valves are connected in cascaded order along an axis perpendicular to the extension axis, the overall length of the cascaded Tesla valves is reduced. In this configuration, "top surface" and "bottom surface" refer to the surface where the forward inlet of the Tesla valve opens as the "bottom surface" and the surface where the outlet opens as the "top surface" for convenience, and are not intended to limit the orientation in which the valve stack is used. [Effects of the Invention]

[0024] According to the present invention as described above, a cutting and polishing liquid filter having a simple structure and effectively suppressing the generation of bacteria in the cutting and polishing liquid, a cutting and polishing liquid filtering method using the cutting and polishing liquid filter, a cutting and polishing liquid filtering system having the cutting and polishing liquid filter, and a valve laminate suitable for use in the cutting and polishing liquid filtering system are realized.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view illustrating the configuration of a cutting and polishing liquid filter according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view illustrating the configuration of the cutting and polishing liquid filter of FIG. 1. [Figure 3] It is a schematic view illustrating a cutting and polishing liquid filtering method according to an embodiment of the present invention. [Figure 4] It is a schematic view illustrating a cutting and polishing liquid filtering method according to another embodiment of the present invention. [Figure 5] It is a schematic view illustrating a cutting and polishing liquid filtering method according to yet another embodiment of the present invention. [Figure 6] It is a schematic view illustrating the configuration of a cutting and polishing liquid filtering system according to an embodiment of the present invention. [Figure 7] It is a schematic perspective view illustrating the configuration of a valve laminate according to an embodiment of the present invention. [Figure 8] It is a schematic perspective view illustrating the appearance of the valve laminate of FIG. 7.

Embodiments for Carrying Out the Invention

[0026] Figures 1 and 2 are perspective and cross-sectional views illustrating the configuration of a cutting and polishing fluid filter according to one embodiment of the present invention. The illustrated cutting and polishing fluid filter 101 comprises a box 1, a mesh 3, and a metal fine fragment assembly 5. The box 1 has openings 7 on both its top and bottom surfaces. The mesh 3 covers both openings 7. The metal fine fragment assembly 5 is an aggregate of metal fine fragments contained within the box 1, with its outflow prevented by the mesh 3. The metal fine fragment assembly 5 is, for example, metal powder, granules, or cutting chips. The metal constituting the metal fine fragment assembly 5 is a heavy metal that exhibits bactericidal properties by ionizing in water, such as copper, silver, platinum, or tin.

[0027] In the illustrated example, the box 1 comprises a cylindrical body 9, a bottom member 11, and a lid member 13. These components constituting the box 1 are, for example, made of stainless steel. The cylindrical body 9 is open at the top and bottom. The bottom member 11 and the lid member 13 are components that cover the open bottom and top surfaces of the cylindrical body 9, respectively. In the illustrated example, the cylindrical body 9 has a rectangular cross-sectional shape in plan view, and both the bottom member 11 and the lid member 13 are plate-shaped and have a rectangular cross-sectional shape in plan view.

[0028] The cylindrical body 9 has flange portions 15 and 17 that protrude outward along the entire circumference of its lower and upper ends, respectively. The bottom member 11 and the lid member 13 are shaped and sized so that their peripheral edges cover the flange portions 15 and 17, respectively. The peripheral edges of the bottom member 11 and the lid member 13 are fastened to the flange portions 15 and 17 by fastening members 23, with seals 19 and 21 in between. In the illustrated example, the fastening member 23 is a bolt and nut set.

[0029] The opening 7 is formed in the bottom member 11 and the lid member 13. In the illustrated example, the mesh body 3 covers the opening 7 from the inside of the bottom member 11 and the lid member 13, and its peripheral edges are pressed and fixed to the bottom member 11 and the lid member 13 by rectangular annular retaining members 25 and 27. The retaining members 25 and 27 are, for example, made of the same material as the bottom member 11 and the lid member 13, and are fixed to the bottom member 11 and the lid member 13 by welding, for example. The mesh body 3 prevents the outflow of the metal fine fragment aggregate 5 while allowing the cutting and polishing fluid to pass through, and the mesh body 3 covering the opening 7 of the lid member 13 also plays a role in preventing the inflow of foreign matter such as cutting and polishing debris mixed in with the cutting and polishing fluid. The mesh body 3 has a mesh size of, for example, about 120 mesh, and its material is, for example, stainless steel or copper.

[0030] As described above, the cutting and polishing fluid filter 101 has a simple structure. To use the cutting and polishing fluid filter 101, a water-soluble cutting and polishing fluid can be flowed from the top to the bottom of the filter 101 through the mesh 3 at the opening 7. As a result, the cutting and polishing fluid comes into contact with the surface of the countless metal particles contained in the metal particle aggregate 5 housed in the box 1, and bactericidal heavy ions dissolve into the cutting and polishing fluid. Since the cutting and polishing fluid passes through the filter 101 without accumulating, the growth of bacteria in the cutting and polishing fluid is effectively suppressed.

[0031] The metal micro-fragment aggregate 5 is preferably an aggregate of copper cutting chips. In this case, copper is used as a heavy metal that exhibits bactericidal properties by ionizing in water, and cutting chips, which are a by-product of metal processing, are used as the micro-fragments, making it inexpensive and effectively suppressing the growth of bacteria in the cutting and polishing fluid.

[0032] Figure 3 is a schematic diagram illustrating a cutting and polishing fluid filtration method according to one embodiment of the present invention. In the illustrated example, a cutting and polishing fluid filter 101 is installed between the machining area 31 of a metalworking machine 29 such as a lathe, milling machine, or drilling machine, and a tank 33 located below it that temporarily stores the cutting and polishing fluid 32 flowing down from the machining area 31 of the workpiece 30. This allows the flowing cutting and polishing fluid 32 to flow from the top surface to the bottom surface of the cutting and polishing fluid filter 101 through the opening 7. As a result, bactericidal heavy ions dissolve into the cutting and polishing fluid 32 flowing down from the machining area 31.

[0033] The cutting and polishing fluid 32, which is temporarily stored in the tank 33, is returned to the nozzle 35 through a circulation system (not shown) provided by the metalworking machine 29 and supplied again to the workpiece 31. In other words, the illustrated method involves placing a cutting and polishing fluid filter 101 in the circulation path of the cutting and polishing fluid 32 supplied to the workpiece 31 by the nozzle 35. As a result, the growth of bacteria in the cutting and polishing fluid 32 is effectively suppressed even within the tank 33.

[0034] Figure 4 is a schematic diagram illustrating a cutting and polishing fluid filtration method according to another embodiment of the present invention. In the illustrated example, cutting and polishing fluid 32 temporarily stored in a tank 33 installed below a metalworking machine 29 is flowed from the top to the bottom of a cutting and polishing fluid filter 101 through an opening 7, and the cutting and polishing fluid 32 flowing out through the opening 7 on the bottom is returned to the tank 33. In other words, the illustrated example provides a secondary circulation path 36 that returns the cutting and polishing fluid 32 stored in the tank 33 through the cutting and polishing fluid filter 101 to the tank 33. As a result, the growth of bacteria in the cutting and polishing fluid 32 stored in the tank 33 is effectively suppressed. In the illustrated example, a pump 37 is installed in the circulation path 36 to circulate the cutting and polishing fluid 32.

[0035] Figure 5 is a schematic diagram illustrating a cutting and polishing fluid filtration method according to yet another embodiment of the present invention. In the illustrated example, during maintenance of the metalworking machine 29, a cutting and polishing fluid filter 101 is first installed at a position to receive the cutting and polishing fluid 32 ejected from the nozzle 35. Then, the cutting and polishing fluid 32 temporarily stored in a tank 33 installed below the metalworking machine 29 is circulated and ejected from the nozzle 35. As a result, the cutting and polishing fluid 32 ejected from the nozzle 35 flows from the top surface to the bottom surface of the cutting and polishing fluid filter 101 through the opening 7.

[0036] As described above, according to the illustrated example, when the metalworking machine 29 is not performing metalworking, the cutting and polishing fluid 32 is circulated so that it passes through the cutting and polishing fluid filter 101, thereby effectively suppressing the growth of bacteria in the cutting and polishing fluid 32. The circulation path 38 in the illustrated example is provided by the metalworking machine 29, and in order to circulate the cutting and polishing fluid 32, the circulation path 38 has, for example, a pump 39.

[0037] If the cutting and polishing fluid 32 is passed through the cutting and polishing fluid filter 101 at a frequency that prevents it from remaining in the system for more than one week, the deterioration of the cutting and polishing fluid 32 is suppressed and the generation of an unpleasant odor is avoided. The inventors of this application have confirmed the effect by conducting simple tests.

[0038] Figure 6 is a schematic diagram illustrating the configuration of a cutting and polishing fluid filtration system according to one embodiment of the present invention. The illustrated cutting and polishing fluid filtration system 102 implements a method of filtering cutting and polishing fluid 32 temporarily stored in a tank 33 installed below the metalworking machine 29, similar to the method illustrated in Figure 4. That is, the cutting and polishing fluid filtration system 102 has a cutting and polishing fluid filter 101 and a secondary circulation path 41 that passes the cutting and polishing fluid 32 stored in the tank 33 through the cutting and polishing fluid filter 101 and returns it to the tank 33. In the circulation path 41, a mesh filter 43, a diaphragm pump 45, a flow smoother 47, and a cyclone filter 49 are installed along the flow of the cutting and polishing fluid 32 up to the cutting and polishing fluid filter 101.

[0039] The mesh filter 43 functions as a primary filter to remove relatively large cutting debris contained in the circulating cutting fluid 32. The mesh filter 43 removes foreign matter with dimensions of 0.1 mm or larger, for example. The diaphragm pump 45 functions as a pump to circulate the cutting fluid 32. The flow smoother 47 has, for example, a damper or a Tesla valve to smooth the pulsation of the cutting fluid 32 circulated by the diaphragm pump 45. The cyclone filter 49 functions as a secondary filter to remove relatively small cutting debris contained in the circulating cutting fluid 32. The cyclone filter 49 removes foreign matter with dimensions of 20 micrometers to 0.1 mm, for example.

[0040] The cutting and polishing fluid 32 that has passed through the cyclone filter 49 flows from the top to the bottom of the cutting and polishing fluid filter 101 through the opening 7. The cutting and polishing fluid 32 that flows out of the cutting and polishing fluid filter 101 returns to the tank 33. The cutting and polishing fluid 32 supplied to the cutting and polishing fluid filter 101 has already had foreign matter smaller than the mesh size of the mesh body 3 covering the opening 7 of the cutting and polishing fluid filter 101 removed by passing through the mesh filter 43 and the cyclone filter 49. For this reason, the mesh body 3 covering the opening 7 on the top of the cutting and polishing fluid filter 101 hardly needs to play a role in removing foreign matter, and the mesh body 3 covering the openings 7 on the top and bottom plays a role in preventing the outflow of metal fine fragment aggregates 5.

[0041] According to the cutting and polishing fluid filtration system 102, the cutting and polishing fluid 32 that flows down from the processed area 31 and is temporarily stored in the tank 33 is circulated so that it passes through the cutting and polishing fluid filter 101, thereby effectively suppressing the growth of bacteria in the cutting and polishing fluid 32 stored in the tank 33. In addition, relatively small cutting and polishing debris is removed by the cyclone filter 49 in the circulation path 41 before the cutting and polishing fluid 32 is supplied to the cutting and polishing fluid filter 101, thus suppressing clogging of the cutting and polishing fluid filter 101. Furthermore, relatively large cutting and polishing debris is removed by the mesh filter 43 before the cutting and polishing fluid 32 is sent to the diaphragm pump 45, flow smoother 47, and cyclone filter 49, thus suppressing malfunctions of these devices due to relatively large cutting and polishing debris. In addition, since a diaphragm pump 45 is used, the circulation path 41 has high sealing performance and is less prone to malfunctions. Furthermore, even though a diaphragm pump 45 is used, the pulsation of the flow rate of the circulating cutting and polishing fluid 32 is suppressed by the flow rate smoother 47, so the operation of the cyclone filter 49 is not hindered.

[0042] Figure 7 is a schematic perspective view illustrating the configuration of a valve stack according to one embodiment of the present invention. Figure 8 is a schematic perspective view illustrating the external appearance of the valve stack of Figure 7. The illustrated valve stack 103 has a plurality of cascaded Tesla valves 51 and is suitable for application to the flow smoother 47 of the cutting and polishing fluid filtration system 102 illustrated in Figure 6.

[0043] The valve stack 103 has multiple stacked valve units 53. These valve units 53 are, in a preferred example, identically configured. Each valve unit 53 has a Tesla valve 51 extending along a single axis 55. An inlet 57 of the Tesla valve 51 opens at the bottom surface of one end of each valve unit 53 along the single axis 55, and an outlet 59 opens at the top surface of the other end. The valve stack 103 achieves cascaded connection of the Tesla valves 51 by stacking the upper valve units 53 on top of the lower valve units 53, with the orientation of the upper valve units 53 along the single axis 55 reversed from the orientation of the lower valve units 53, so that the outlet 59 of the lower valve unit 53 communicates with the inlet 57 of the upper valve unit 53. All valve units 53 included in the valve stack 103 are fastened together as a single unit by fastening members 61. In the illustrated example, the fastening members 61 are a set of bolts and nuts.

[0044] The valve stack 103 has cascaded Tesla valves 51, which provides a high level of flow smoothing. Moreover, since the Tesla valves 51 are not cascaded along a continuous axis 55, but rather along an axis perpendicular to the axis 55, the total length of the cascaded Tesla valves 51 is reduced. In other words, the installation area is reduced. Furthermore, the valve stack 103 is suitable not only for flow smoothing but also for preventing backflow. [Explanation of symbols]

[0045] 1 Box body, 3 Mesh body, 5 Metal microflake aggregate, 7 Opening, 9 Cylindrical body, 11 Bottom member, 13 Lid member, 15,17 Flange part, 19,21 Seal, 23 Fastening member, 25,27 Retaining member, 29 Metalworking machine, 30 Workpiece, 31 Machining area, 32 Cutting and polishing fluid, 33 Tank, 35 Nozzle, 36 Circulation path, 37 Pump, 38 Circulation path, 39 Pump, 41 Circulation path, 43 Mesh filter, 45 Diaphragm pump, 47 Flow smoother, 49 Cyclone filter, 51 Tesla valve, 53 Valve unit, 55 Single shaft, 57 Inlet, 59 Outlet, 61 Fastening member, 101 Cutting and polishing fluid filter, 102 Cutting and polishing fluid filtration system, 103 Valve laminate.

Claims

1. A box-shaped body having openings on the top and bottom, A mesh covering the openings on the upper and lower surfaces, The collection comprises an aggregate of fine metal fragments, which is contained within the box and whose outflow is prevented by the aforementioned mesh, The aforementioned metal is a heavy metal that exhibits bactericidal properties by ionizing in water, and is used in a cutting and polishing fluid filter.

2. The cutting and polishing fluid filter according to claim 1, wherein the metal fragments are copper cutting chips.

3. A cutting and polishing fluid filter according to claim 1 or 2 is installed between the processing area of ​​a metalworking machine and a tank located below it that temporarily stores the cutting and polishing fluid flowing down from the processing area. A method for filtering cutting and polishing fluid, wherein the flowing cutting and polishing fluid flows from the upper surface to the lower surface of the cutting and polishing fluid filter through the opening.

4. Install the cutting and polishing fluid filter described in claim 1 or 2, A method for filtering cutting and polishing fluid, comprising: flowing the cutting and polishing fluid, which is temporarily stored in a tank located below the processing area of ​​a metalworking machine and which collects the cutting and polishing fluid flowing down from the processing area, from the upper surface to the lower surface of a cutting and polishing fluid filter through the opening; and returning the cutting and polishing fluid that flows out through the opening on the lower surface to the tank.

5. During maintenance of a metalworking machine, the cutting and polishing fluid filter described in claim 1 or 2 is installed at a position that receives the cutting and polishing fluid sprayed by a nozzle that sprays cutting and polishing fluid onto the workpiece, The system includes a tank located below the machining area that temporarily stores the cutting and polishing fluid flowing down from the machining area, and circulating the cutting and polishing fluid stored in the tank before ejecting it from the nozzle, A method for filtering cutting and polishing fluid, wherein the cutting and polishing fluid ejected from the nozzle flows from the upper surface to the lower surface of the cutting and polishing fluid filter through the opening.

6. A cutting and polishing fluid filtration system located below the machining area of ​​a metalworking machine, which filters the cutting and polishing fluid stored in a tank that temporarily holds the cutting and polishing fluid flowing down from the machining area, A cutting and polishing fluid filter according to claim 1 or 2, The cutting and polishing fluid stored in the tank flows from the upper surface to the lower surface of the cutting and polishing fluid filter through the opening, and the cutting and polishing fluid flowing out through the opening on the lower surface is returned to the tank, and the filter is provided with a circulation path. The circulation path, from the tank to the upper surface of the cutting and polishing fluid filter, includes a mesh filter, a diaphragm pump, a flow smoother, and a cyclone filter, arranged in order along the flow. The mesh filter functions as a primary filter to remove relatively large cutting and polishing debris contained in the circulating cutting and polishing fluid. The diaphragm pump functions as a pump for circulating the cutting and polishing fluid. The flow smoother smooths the pulsation of the cutting and polishing fluid circulated by the diaphragm pump, The cyclone filter functions as a secondary filter to remove relatively small cutting debris contained in the circulating cutting fluid, thus forming a cutting fluid filtration system.

7. The flow smoother has a valve stack in which multiple stages of valve units, each having a Tesla valve extending along a single axis, are stacked. An inlet for the Tesla valve is opened on the bottom surface of one end of each valve unit along the aforementioned axis, and an outlet for the Tesla valve is opened on the top surface of the other end. The cutting and polishing fluid filtration system according to claim 6, wherein the valve stack is stacked on top of the lower valve unit, with the orientation of the upper valve unit reversed along the uniaxial direction from that of the lower valve unit, so that the outlet of the lower valve unit communicates with the inlet of the upper valve unit, thereby achieving a cascaded connection of Tesla valves.

8. A valve stack comprising multiple stages of valve units, each having a Tesla valve extending along a single axis, An inlet for the Tesla valve is opened on the bottom surface of one end of each valve unit along the aforementioned axis, and an outlet for the Tesla valve is opened on the top surface of the other end. The valve stack is a valve stack that achieves cascaded connection of Tesla valves by reversing the orientation of the upper valve unit along the uniaxial axis from that of the lower valve unit and stacking it on top of the lower valve unit, so that the outlet of the lower valve unit communicates with the inlet of the upper valve unit.

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