Processing system and filter unit

Abstract

To separate chips and a coolant from each other more easily without using a pump.SOLUTION: In order to achieve the above object, a processing system 1 of the invention includes: a supply device 210 which supplies a coolant filtered by a cylindrical filter 251; and a processing device 200 which processes an object to be processed while using the coolant. The cylindrical filter 251 is immersed in the coolant in a tank 250 which is not connected to a pump and separates chips occurring during processing by the processing device 200 and the coolant from each other.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a processing device that processes a workpiece, a processing system that includes the processing device, and a filter unit. [Background technology]

[0002] In an apparatus for removing aluminum from aged liquid in a secondary electrolytic coloring liquid bath, a system configuration has been proposed in which a circulation pump is installed in front of a filter in a circulation water channel as a means for removing aluminum from the aged liquid, and the aged liquid is passed through the filter by the lifting force of the pump to remove the aluminum (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-80112 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of a filtration method in which liquid is passed through a filter in a circulation channel using the lift of a circulation pump, as in the configuration described in Patent Document 1, a pump is required. Furthermore, if chips or other debris adhere to the filter and clog it, the circulation pump is overloaded, reducing the flow rate of the circulation channel. For example, if this configuration is used in a machining device, a decrease in the amount of coolant discharged can affect the accuracy of the workpiece. Furthermore, the pump is overloaded to compensate for the reduced flow rate, increasing the pump failure rate. [Means for solving the problem]

[0005] In order to solve the above problems, the processing system of the present invention is a processing system comprising a supply device that supplies coolant liquid filtered by a cylindrical filter, and a processing device that processes an object to be processed using the coolant liquid, wherein the cylindrical filter is immersed in the coolant liquid in a tank that is not connected to a pump, and separates the coolant liquid from chips generated during processing by the processing device. [Effects of the Invention]

[0006] According to the present invention, chips and coolant liquid can be easily separated without using a pump. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an external perspective view of a processing system according to an embodiment. [Figure 2] FIG. 1 is an external front view of a processing system according to an embodiment. [Figure 3] FIG. 1 is a perspective view of a processing machine according to an embodiment. [Figure 4] FIG. 2 is a control block diagram of the machining system according to the embodiment. [Figure 5] FIG. 2A is a diagram showing a state in which the opening and closing door of the processing device according to the embodiment is open; FIG. 2B is a diagram showing an enlarged portion of FIG. [Figure 6] FIG. 2 is a cutaway front view of a lower portion of the processing device according to the embodiment. [Figure 7] FIG. 2 is an external perspective view of a coolant supply device filter according to the embodiment. [Figure 8] FIG. 2 is an exploded perspective view of the coolant supply device filter according to the embodiment; [Figure 9] FIG. 2 is an external perspective view of a first coolant tank according to the embodiment. [Figure 10] FIG. 3 is a cross-sectional view of a coolant supply device filter according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] The embodiment will be described with reference to the drawings. First, the overall configuration of a processing system 1 of the embodiment will be described with reference to FIGS.

[0009] [Processing system] The machining system 1 includes a machining device 200 and a coolant supply device 210. In this embodiment, the machining device 200 and the coolant supply device 210 are shown as separate entities, but the coolant supply device 210 may be integrated into the machining device. The machining device 200 machines a workpiece using tools in a machining area 120. The machining device 200 houses the processing machine 100 in an exterior cover 101 serving as a housing. That is, the exterior cover 101 houses a spindle, a tool magazine, and other components described below. An openable door (not shown) is provided at the front opening of the exterior cover 101. When the openable door is open, the interior of the housing, i.e., the machining area 120 described below, is accessible, allowing for workpiece replacement and manual tool replacement.

[0010] The coolant supply device 210 supplies coolant, which is a liquid for cooling workpieces, tools, etc., into the machining area 120 of the machining apparatus 200. The coolant supply device 210 of this embodiment is disposed below the machining apparatus 200 and includes a tank 211, a pump 212, a flow meter 213, and a solenoid valve 214, which are connected by pipes 220 to 224. The arrows shown in FIGS. 1 and 2 indicate the path and direction of coolant flow. The tank 211 contains coolant, and the pump 212 sucks the coolant from the tank 211 via the pipe 220 and sends it to the pipe 221. The coolant sent to the pipe 221 passes through the flow meter 213 via the pipe 222. The flow meter 213 measures the flow rate of the coolant supplied from the pump 212 and sends a signal to a CPU 85 (FIG. 4), which is a main control unit of the machining system 1 (described later). A strainer 215 is provided midway along the pipe 222 to remove foreign matter from within the pipe path.

[0011] The coolant liquid that has passed through the flow meter 213 is sent to a pipe 223 and reaches a solenoid valve 214 provided on the pipe 223. The solenoid valve 214 opens and closes the flow path and is controlled by the above-mentioned CPU 85 to start and stop the supply of the coolant liquid to the machining device 200. The pipe 223 is connected to the machining device 200, and the coolant liquid that has passed through the solenoid valve 214 in an open state is supplied into the machining area 120 via a coolant discharge unit 202 serving as a coolant liquid supply unit provided in a spindle head 201 of the machining device 200. When the solenoid valve 214 is closed, the coolant liquid supplied from the pump 212 is returned to the tank 211 via a pipe 224 branching from the pipe 221.

[0012] The coolant discharge unit 202 is, for example, a nozzle provided around the spindle 11 (FIG. 3) of the spindle head 201, and supplies the coolant toward a tool held by the spindle 11 or a workpiece, which is an object to be machined, by discharging the coolant downward. The coolant supplied from the coolant discharge unit 202 accumulates in the lower part of the machining area 120 and is discharged from the lower part of the machining device 200. A tray 216 (filtering device) is provided below the machining device 200, which receives the coolant discharged from the machining device 200 and returns it to the tank 211. In this way, the machining system 1 of this embodiment uses the coolant to cool the tool or workpiece during machining. Note that this embodiment is provided with an air blow unit 87 (FIG. 4) that blows air toward the tool or the like.

[0013] [Processing machine] Next, the processing machine 100 arranged inside the exterior cover 101 of the processing device 200 will be described with reference to Fig. 3. The processing machine 100 includes a frame 1xz as a movement mechanism support member, a first movement mechanism (Z-axis movement mechanism) 10, a second movement mechanism (X-axis movement mechanism) 20, and a third movement mechanism (Y-axis movement mechanism) 30, each supported by the frame 1xz, a support mechanism 40 that supports a workpiece W as a processing target, a first rotation mechanism (rotation device) 50 and a second rotation mechanism 60 as rotation means capable of rotating the support mechanism 40, a tool magazine 70, and an electrical unit 80. The first movement mechanism 10, the second movement mechanism 20, and the third movement mechanism 30 constitute a movement device 100A that serves as movement means for relatively moving a spindle 11 and a holding device 41 (described later) in the three axial directions of X, Y, and Z.

[0014] The first movement mechanism 10 is supported by the first frame portion 3 of the frame 1xz via the second movement mechanism 20, and is capable of moving the spindle 11 in the Z-axis direction (vertical direction, first direction). A tool 12 is detachably attached to the spindle 11 via a tool holder. In other words, the spindle 11 is capable of gripping the tool 12. The spindle 11 is rotationally driven by a motor 13. The first movement mechanism 10 has a motor 14 and a guide shaft (not shown) arranged in the Z-axis direction, and is driven by the motor 14 to reciprocate (raise and lower) the spindle 11 in the Z-axis direction along the guide shaft. The spindle 11 is movably supported on the guide shaft via a Z-axis support member (not shown). The guide shaft and the Z-axis support member are covered by a cover 17.

[0015] The second movement mechanism 20, which serves as a movement unit, is supported by the first frame portion 3 of the frame 1xz and is capable of moving the main shaft 11 together with the first movement mechanism 10 in the X-axis direction (predetermined direction, horizontal direction, second direction) perpendicular to the Z-axis direction. The second movement mechanism 20 has a motor 21, a guide shaft 22 arranged in the X-axis direction, and rails 23 and 24 arranged in the X-axis direction. Driven by the motor 21, the first movement mechanism 10 reciprocates along the guide shaft 22 in the X-axis direction. Specifically, the guide shaft 22, which is a threaded shaft, is inserted into a nut member 19 fixed to a holder 18 that holds the main shaft 11 and the first movement mechanism 10. The holder 18 is also provided with engagement portions 25 and 26 that engage with the rails 23 and 24. When the guide shaft 22 is rotated by the motor 21, the nut member 19, which is threadedly engaged with the guide shaft 22, moves along the guide shaft 22. The holding portion 18 to which the nut member 19 is fixed, and the spindle 11 and first moving mechanism 10 held by the holding portion 18, move in the X-axis direction based on the engagement between the engaging portions 25, 26 and the rails 23, 24. The second frame portion 4 is connected to the lower end of the first frame portion 3 so as to extend in the Y-axis direction, and the first frame portion 3 and the second frame portion 4 are further connected by a reinforcing plate 29.

[0016] The third movement mechanism 30 is supported on the underside of the second frame portion 4 of the frame 1xz, and is capable of moving the support mechanism 40 in the Y-axis direction (horizontal direction, third direction) perpendicular to the Z-axis direction and the X-axis direction. The third movement mechanism 30 has a motor 32 and a guide shaft (not shown) arranged in the Y-axis direction, and is driven by the motor 32 to move the support mechanism 40 back and forth in the Y-axis direction along the guide shaft. As shown in FIG. 3, the side of the gantry 2 facing the support mechanism 40 in the Y-axis direction is open. The third movement mechanism 30 is capable of moving the support mechanism 40 in the Y-axis direction together with the second rotation mechanism 60 and the first rotation mechanism 50, as will be described in detail later.

[0017] The support mechanism 40 supports a workpiece W, such as a dental prosthesis, as an object to be machined by the tool 12. The support mechanism 40 has a holding device 41 as a holding part that holds the workpiece W, and a support part 42 whose both ends are connected to the rotating part 51 of the first rotating mechanism 50 and that supports the workpiece W via the holding device 41.

[0018] The first rotation mechanism 50, which serves as a rotation device, can rotate the support mechanism 40 around the a-axis, which serves as a rotation axis perpendicular to the Z-axis direction. In this embodiment, the a-axis is parallel to the X-axis direction. The first rotation mechanism 50 includes a support frame 53 that rotatably supports the rotating unit 51 and a motor that rotates the rotating unit 51. The support frame 53 is formed in a generally U-shape so as to surround the periphery of the support mechanism 40, and is composed of a first support part 53a that supports the motor and the rotating unit 51 on one side (the driving side), a second support part 53b that supports the rotating unit on the other side (the driven side), and a connecting part 53c that connects the first support part 53a and the second support part 53b.

[0019] The rotating part 51 supported by the first support part 53a and the rotating part supported by the second support part 53b are arranged to face each other in the a-axis direction and to be rotatable around the a-axis as a rotation axis. Both ends of the support mechanism 40 in the a-axis direction are supported by the rotating parts on both sides. As a result, the first rotation mechanism 50 supports the support mechanism 40 rotatably around the a-axis (X-axis).

[0020] The first rotation mechanism 50 can rotate at least 180° and can turn over the workpiece W supported by the support mechanism 40. In this embodiment, the first rotation mechanism 50 can rotate the support mechanism 40 360° around the a-axis.

[0021] The second rotation mechanism 60 can rotate the support mechanism 40 around the b-axis, which is another rotation axis perpendicular to the Z-axis direction and the a-axis. In this embodiment, the b-axis is parallel to the Y-axis direction. The second rotation mechanism 50 has a rotating unit to which the support frame 53 of the first rotation mechanism 50 is attached, and a motor that rotates and drives the rotating unit. The rotating unit is attached to a connecting portion 53c of the support frame 53, and is rotated by the motor to rotate the support frame 53 around the b-axis.

[0022] The tool magazine 70 serving as a tool holder can store a plurality of tools and is disposed adjacent to the first rotation mechanism 50. The tool magazine 70 can be moved in the Y-axis direction together with the support mechanism 40 and the like by the third movement mechanism 30. However, even if the support mechanism 40 rotates around the a-axis, the tool magazine 70 does not rotate, and even if the support mechanism 40 rotates around the b-axis, the tool magazine 70 does not rotate.

[0023] In the tool magazine 70, a plurality of types of tools, each formed integrally with the tool holder 12a, are held and arranged in a plurality of rows along the Y-axis direction, and the tools attached to the spindle 11 are changeable.

[0024] In addition, in this embodiment, before and after storing or removing the tool, an operation is performed to confirm whether or not the tool 12 is being held by the spindle 11 by bringing the tip of the tool 12 into contact with a touch sensor 96, which serves as tip detection means capable of detecting the tip of the tool 12 held by the spindle 11.

[0025] The electrical unit 80 is attached to the inside of the frame 1xz. That is, the electrical unit 80 is disposed on the upper side of the second frame portion 4, opposite to the side on which the first movement mechanism 10 of the first frame portion 3 is supported. Such an electrical unit 80 controls the machining system 1 or the machining device 200, and includes a control board that controls the drive of the motors of the spindle and each axis, and a plurality of control units that calculate pulses to be output to the motors from signals from the rotary encoders of the corresponding motors and appropriately control the rotation of the corresponding motors.

[0026] The processing machine 100 of this embodiment is an NC processing machine that performs automatic processing under computer control. Specifically, processing data is created by a CAD / CAM system using an external terminal such as a personal computer, and the workpiece W is processed by numerical control based on this data. For this purpose, an external terminal such as a personal computer that issues commands to the processing machine 100 is connected to the processing machine 100. Note that the processing machine 100 itself may be provided with a computer equipped with a CPU and memory capable of numerical control. The control means described below may be provided in either the processing machine or a computer connected to the processing machine.

[0027] For example, when a dental prosthesis (dental material) is produced using the processing machine 100, data of the dental prosthesis measured by a three-dimensional measuring device is transferred to a CAD / CAM system, and processing data is created by the CAD / CAM system. Then, based on this processing data, the processing machine 100 is controlled to cut the workpiece W with the tool 12, thereby producing the dental prosthesis.

[0028] Next, the control configuration within the electrical unit 80 will be described with reference to Fig. 4. The electrical unit 80 includes a CPU 85 as control means (main control unit), an input / output port (I / O) 86i, motor control units 84x, 84y, and 84z, a spindle control unit 84c, an a-axis control unit 84a, and a b-axis control unit 84b. The CPU 85 performs various calculations using memory 86m based on input data and signals, and sends instructions on rotation speed and position to the connected control units 84x, 84y, 84z, 84a, 84b, and 84c, which serve as servo amplifiers.

[0029] The I / O 86i is connected to the compressor 350, the pump 212, the touch sensor 96, the air pressure detection sensor 91, the flow meter 213, and the solenoid valve 214. The compressor 350 supplies air to an air blow unit 87 of the processing device 200. The air blow unit 87 blows the air supplied from the compressor 350 onto the tool 12 attached to the spindle 11 to cool the tool 12 and remove chips adhering to the tool 12. The pressure of the air supplied to the air blow unit 87 is detected by an air pressure detection sensor 91, and a detection signal of the air pressure detection sensor 91 is sent to the CPU 85 via the I / O 86i.

[0030] As described above, the pump 212 supplies coolant to the coolant discharge unit 202. The coolant discharge unit 202 supplies the coolant toward the tool 12 and the workpiece. As described above, the touch sensor (tool length sensor) 96 as a tip detecting means is used to confirm whether or not the tool 12 is held by the spindle 11 during a tool changing operation, and also detects the length of the tool 12 and sends a signal to the CPU 85.

[0031] Motor control units 84x, 84y, and 84z provided in the CPU 85 drive the X, Y, and Z motors based on commands from the CPU 85. Each of the motors 21, 32, and 14 is provided with an encoder as a position detection means. The encoder detects, for example, the number of rotations, rotation angle, and rotation direction of the rotation shaft of each of the motors 21, 32, and 14. The encoder then detects the amount of actual movement of each of the stages x, y, and z (actual position, the relative position of the spindle 11 with respect to the holding device 41) by driving each of the motors 21, 32, and 14.

[0032] The main shaft control unit 84c controls the rotation speed of the main shaft (spindle) by controlling a motor (not shown) that rotates the main shaft 11. Furthermore, the a- and b-axis control units 84a and 84b drive the a-axis and b-axis motors 54 and 62 based on commands from the CPU 85. These motors 54 and 62 are also provided with encoders 54a and 62a, which can detect the rotation angles of the support mechanism 40 around the a-axis and b-axis.

[0033] In this way, the CPU 85 controls each part of the processing machine 100, thereby performing predetermined processing on the workpiece W held as described above. The CPU 85 executes each operation and process described below by loading a program into storage means such as the memory 86m. When detecting the amount of coolant by weight, a tank weight detection sensor 97 may be disposed in the part of the tank that receives the weight, and the amount of coolant may also be measured by a water level gauge or water surface sensor.

[0034] [Discharge configuration within the processing area] Next, the discharge configuration for the coolant and chips in the machining area 120 will be described with reference to Figures 5(a) to 6. The coolant discharged from the coolant discharge part 202 (Figure 1) during machining and the chips generated when machining the workpiece are collected at the bottom of the area cover 200. As shown in Fig. 5(a), a processing equipment filter 203 is disposed at the bottom of the area cover 200, which captures foreign matter such as chips that have gathered at the bottom and drops the coolant liquid from which the foreign matter has been removed downward. As shown in Fig. 6, a discharge port 204 is provided below the processing equipment filter (filter within the processing equipment) 203, and the coolant liquid that has passed through the processing equipment filter 203 is discharged from the discharge port 204. The coolant liquid discharged from the discharge port 204 is sent to the filter of the tray 216 of the coolant liquid supply device 210 described in Fig. 1 and returned to the tank 211.

[0035] As shown in FIG. 5(b), the processing equipment filter 203 includes a processing equipment filter portion 203a, an outer frame 203b that houses the processing equipment filter portion 203a, and a grip portion 203c that protrudes upward from the front of the outer frame 203b. The processing equipment filter portion 203a is made of a material, such as nonwoven fabric, that allows liquid to pass through but blocks solid matter such as chips. Liquids pass through the processing equipment filter portion without the need for any external force. The outer frame 203b houses the filter portion 203a and is fitted into the recess 205. The height of the outer frame 203b is equal to or shorter than the depth of the recess 205, allowing coolant and other liquids flowing toward the recess 205 to flow into the outer frame 203b.

[0036] The grip portion 203c is a portion that a user grasps with their hand when attaching or detaching the processing device filter 203 to or from the recess 205. The processing device filter 203 needs to be replaced or cleaned periodically because foreign matter such as cutting chips accumulates in the processing device filter 203. The grip portion 203c is provided on the front side of the outer frame 203b so as to protrude upward. This allows a user to easily access the grip portion 203c by opening the access door 102, facilitating the work of attaching or detaching the processing device filter 203 to or from the recess 205. As a result, the maintainability of the processing device filter 203 can be improved. The grip portion 203c is provided so as not to interfere with the access door 102 even when the access door 102 is closed.

[0037] [Filtering device discharge configuration] Next, the discharge configuration of the coolant liquid and chips of the filtering device 216 will be described with reference to Figures 7 to 10. The filtering device 216 is made up of a first tank 230 on the upstream side and a second tank 250. The second tank 250 of the filtering device 216 has a foldable handle 250f, which makes it easy to remove from the filtering device 216 for maintenance or cleaning.

[0038] Specifically, first tank 230 of filtration device 216 has recess 230a capable of accommodating first filter 231, first tank cover 230b that covers the recess, and opening 230c in part of the bottom of the recess. First tank 230 is removable and has filter retainer block 230d that holds second filter 251 (cylindrical filter) in the axial direction, which will be described later. Cylindrical filters are called pleated filters, and by forming the filter into a pleated shape (folds), the surface area per volume is increased, thereby improving filtration performance.

[0039] As shown in FIG. 9 , the first filter 231 includes an outer frame 231b for accommodating chips (swarf), a handle 231c protruding from the front of the outer frame, a first filter 231a disposed below the outer frame, and a base 231d for securing the filter. The filter 231a is sandwiched between the outer frame 231b and the base 231d. The filter 231a is made of a material, such as a nonwoven fabric, that allows liquid to pass through but blocks solid matter such as chips. Liquids pass through the first filter without the application of a special external force. The first filter 231 uses a filter with a coarser mesh than the cylindrical filter of the second filter 251. The processing equipment filter 203 also uses a filter with a coarser mesh than the first filter 231. This configuration allows separation upstream, preventing large chips from flowing downstream.

[0040] The grip portion 231c is a portion that a user grasps with their hand when attaching or detaching the first filter 230 to or from the recess 230a. The filter 231a collects foreign matter such as cutting chips, so it needs to be replaced or cleaned periodically. The grip portion 231c is provided on the front side of the outer frame so as to protrude forward. Therefore, by opening the supply device opening / closing door 218 of the coolant liquid supply device 210, a user can easily access the grip portion, facilitating the attachment and detachment of the first filter 230 to or from the recess 231a. As a result, the maintainability of the first filter 230 can be improved.

[0041] 8 and 10, the second tank 250 has a second filter 251, a filter tank 250a that stores chips and coolant, and an overflow tank 250b into which coolant flows when the filter begins to clog. The filter unit may consist of only the second filter 251 and the filter tank 250a, or other components may be attached.

[0042] The filter tank 250a has a retaining ring 250c that holds the second filter 251, and a protrusion 230d that supports the second filter at the bottom of the filter tank 250a. This configuration has two second filters 251. The second filter 251 is a pleated filter with a larger cross-sectional area for capturing chips than the processing equipment filter 203 and the first filter 230. The second filter 251 is made of a material, such as nonwoven fabric, that allows liquid to pass through but blocks solid matter such as chips. Furthermore, the liquid passes through the second filter 251 without applying any external force. The second filter 251 is submerged in the coolant, and the liquid flows from the outer periphery to the inner periphery.

[0043] The second filter 251 is fully immersed in the coolant, allowing it to perform its filtering function under water pressure. For this purpose, a drain pipe 250g is attached to the drainage section of the filter tank 250a. Positioning the cylindrical filter so that its longitudinal axis is aligned with the horizontal plane facilitates filtration without increasing its height. Coolant is stored inside the filter tank 250a up to the height of the drain pipe 250g. The height of the drain pipe 250g is within a range H, which is lower than the height of the opening 250e and higher than the center height of the second filter 251. This allows the second filter 251 to be sufficiently submerged. Because the submersion allows the coolant to pass through the second filter 251, the pump 212 does not need to be attached to the filter tank 250a; it is a separate component. As shown in FIG. 2, the pump 212 is connected to a tank 211 separate from the filter tank 250a and supplies the coolant stored in the tank 211 to the processing machine 100. Therefore, even if the second filter 251 becomes clogged with chips, a stable flow rate can be supplied to the processing machine 100 without being affected by the second filter, and processing accuracy is stabilized.

[0044] The coolant liquid that has passed through the filter 231 of the first tank 230 flows into the filter tank 250a of the second tank 250. When the second filter 251 is not clogged, the coolant liquid level in the second tank remains stable without change and flows into the tank 211. At this time, no coolant liquid is stored in the overflow tank 250b.

[0045] When clogging begins to occur in second filter 251 of filter tank 250 of second tank 250, the flow rate of coolant liquid flowing through second filter 251 decreases, and the water level in filter tank 250 rises. Filter tanks 250a and 250b have openings 250e at the tops thereof that communicate with each other and through which coolant liquid flows, and only when clogging occurs and the water level rises does coolant liquid flow into overflow tank 250b.

[0046] When the coolant flows into the overflow tank 250b, the amount of coolant contained in the tank 211 decreases, and a signal of the weight of the coolant measured by the tank weight detection sensor 97 is transmitted to the CPU 85. The CPU 85 determines that the decrease in the tank weight is a clog and issues a warning that the processing device is in an inappropriate state to continue processing.

[0047] As another filter configuration, the first and second tanks of the filtration device may be arranged in parallel, and the second filter may be a filter with a configuration similar to that of the first filter, rather than a cylindrical pleated filter. In this case, the second tank may be provided with an overflow tank, and when the second filter becomes clogged, the coolant liquid may flow into the overflow tank from an opening. [Explanation of symbols]

[0048] 100...Processing equipment 210 Coolant supply device 211 Tank 212 Pump 216 Filtration equipment 230...1st tank 231 First filter 250...2nd tank 250a···Filter tank 250b Overflow tank 250e...Opening 250g...Drain pipe 251 Second filter

Claims

1. a supply device for supplying coolant liquid filtered by a cylindrical filter; a processing device that processes a workpiece while using the coolant liquid, The cylindrical filter is immersed in the coolant liquid in a tank that is not connected to a pump. A machining system characterized in that chips generated during machining by the machining device are separated from the coolant liquid.

2. another filter having a coarser mesh than the cylindrical filter is provided upstream of the cylindrical filter; 2. The processing system according to claim 1, wherein the cylindrical filter is disposed so that its longitudinal direction is along a horizontal plane.

3. 3. The processing system according to claim 2, further comprising an in-processing device filter provided in the processing device upstream of the other filter.

4. 2. The processing system according to claim 1, further comprising an opening provided above the tank, and an overflow tank communicating with the opening.

5. a tank through which the coolant flows; a weight detection sensor that measures the weight of the tank, 2. The processing system according to claim 1, wherein the weight detection sensor detects clogging of the cylindrical filter.

6. A filter unit using a cylindrical filter that separates chips and coolant liquid, The filter unit is characterized in that the cylindrical filter is immersed in the coolant liquid in a tank not connected to a pump to separate the chips from the coolant liquid.

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