JP2021178368A - Machine tool - Google Patents

Abstract

[Problem] To efficiently collect and reuse mist coolant. SOLUTION: An enclosing member 110 surrounding a machining space S for machining a work W, a work machining section 120 for machining the work W within the machining space S, and a coolant supply section 130 supplying a coolant CL to the machining space S. The purification unit 200 includes a purification unit 200 that circulates and purifies the air in the processing space S, and a recovery unit 300 that collects liquefied coolant CL from the purification unit 200. a first flow path section that moves air from the processing space S to the blower section; a second flow path section that moves air from the blower section to the processing space S; a first flow path section and a second flow path section. The coolant CL liquefied in the first channel section flows through the drain 240 from the first channel section to the second channel section, and then flows into the recovery section 300. ,Machine Tools. [Selection diagram] Figure 3

Description

This disclosure relates to machine tools.

Patent Document 1 is a mist collecting device that sucks the atmosphere of the processing chamber from a processing device that performs processing while supplying processing water to the workpiece in the processing chamber and collects mist from the sucked atmosphere. A suction duct connected to the processing chamber, a fan unit that sucks and discharges the atmosphere of the processing chamber through the suction duct, and a connection between the suction duct and the fan unit to capture and mist in the atmosphere. The mist removing means is composed of a mist removing means to be removed, and the mist removing means is connected to a housing to which the fan unit is connected and the suction duct is connected to the upstream side of the air flow generated by the fan unit, and the housing. The mist catching section is provided with a mist catching section to be accommodated and a drainage means for draining a liquid composed of mist captured through an outlet at the lower end of the housing, and the mist catching section is first located on the upstream side of the airflow. A demister and a second demister finer than the first demister are provided on the downstream side of the airflow, and a cooling means for cooling the passing airflow is arranged between the first demister and the second demister. It teaches a mist collecting device that is provided and is characterized in that clean air discharged through the fan unit is discharged into a clean room or returned to the processing room.

Japanese Unexamined Patent Publication No. 2016-47563

In the mist collecting device disclosed in Patent Document 1, since the inside of the housing accommodating the mist trapping portion on the upstream side of the fan unit of the airflow generated by the fan unit has a negative pressure, the outlet at the lower end of the housing has an outlet. It is difficult to efficiently guide the liquefied mist to the drainage means through the air.

One aspect of the present disclosure is a surrounding member surrounding a machining space for machining a work, a work machining section for machining a workpiece in the machining space, a coolant supply section for supplying coolant to the machining space, and the machining space. A purification unit that purifies while circulating air and a collection unit that collects the coolant liquefied from the purification unit are provided, and the purification unit has a blower unit that circulates air in the processing space and the processing space. A first flow path portion that moves the air from the blower section to the blower section, a second flow path section that moves the air from the blower section to the processing space, a first flow path section, and a second flow path section. The coolant liquefied in the first flow path portion includes a drain for communicating with the drain, and the drain flows from the first flow path portion to the second flow path portion, and then to the recovery section. Regarding the inflow of machine tools.

According to the present disclosure, it is possible to provide a machine tool having a simple structure capable of efficiently recovering coolant.

It is a top view which shows typically the structure of the example of the machine tool which concerns on 1st Embodiment. It is a schematic arrow view of the machine tool of FIG. 1 on the line II-II. It is a schematic side view of the machine tool of FIG. It is a schematic cross-sectional view of the purification part which concerns on 1st Embodiment. It is a schematic sectional view of the purification part which concerns on 2nd Embodiment. It is a schematic cross-sectional view of the purification part which concerns on 1st reference example. It is a schematic cross-sectional view of the purification part which concerns on the 2nd reference example.

Hereinafter, embodiments of the machine tool will be described with reference to the attached drawings. In the description of each embodiment, terms indicating directions (for example, "up / down", "left / right", and "X-axis, Y-axis, Z-axis", etc.) are appropriately used, but these terms are for illustration purposes only. The present invention is not limited thereto. Further, in each drawing, the shape or size of each component of the machine tool is not necessarily represented by the same scale ratio. Further, in each drawing, the same components are shown by using the same reference numerals.

<First Embodiment>
FIG. 1 is a top view schematically showing the structure of an example of a machine tool according to the first embodiment. FIG. 2 is a schematic arrow view of the machine tool of FIG. 1 on line II-II. FIG. 3 is a schematic side view of the machine tool of FIG. The machine tool 100 of the illustrated example is a horizontal machining center capable of multi-faceted machining of a work W as a workpiece by controlling at least the X-axis, the Y-axis, and the Z-axis, for example. FIG. 4 is a schematic cross-sectional view of the purification unit according to the first embodiment.

The machine tool is, for example, a lathe, a vertical or horizontal machining center, a multi-tasking machine having a turning function using a fixed tool and a milling function using a rotary tool, and an X-axis, a Y-axis, and a Z-axis. Examples include, but are not limited to, a 5-axis machine tool controlled by two or more swivel axes, an Adaptive Manufacturing (AM) machine capable of metal addition machining, and the like.

The machine tool 100 according to the present embodiment supplies the coolant CL to the surrounding member 110 that surrounds the processing space S for processing the work W, the work processing unit 120 that processes the work W in the processing space S, and the processing space S. It includes a coolant supply unit 130, a purification unit 200 that purifies the processing space S while circulating air, and a collection unit 300 that collects the liquefied coolant CL from the purification unit 200. As shown in FIGS. 1 to 3, the purification unit 200 can be fixed to both ends of the ceiling of the surrounding member 110 in the X-axis direction, one at each end, but the arrangement and number thereof are not particularly limited.

The purification unit 200 has a blower unit 210 that circulates air in the processing space S, a first flow path portion 220 that moves air from the processing space S to the blower unit 210, and an air blower unit 210 that moves air to the processing space S. A second flow path portion 230 and a drain 240 communicating with the first flow path portion 220 and the second flow path portion 230 are provided. In FIG. 3, the flow of air including the mist of the coolant CL sucked from the processing space S into the purification unit 200 is schematically shown by a white arrow. As shown in FIG. 4, the mist-like coolant CL is liquefied in the first flow path portion 220, and the liquefied coolant CL flows the drain 240 from the first flow path portion 220 to the second flow path portion 230, and then. It falls below the processing space S, or flows along the wall surface of the surrounding member 110 or the like, and flows into the recovery unit 300. In FIG. 3, the flow of the liquefied coolant CL is schematically shown by a broken line arrow. In FIGS. 1 to 3, the purification section 200 is provided so that the first flow path section 220 and the second flow path section 230 face the Z-axis direction, but the installation direction of the purification section 200 is particularly limited. Not done.

Since the air guided by the first flow path portion 220 is sucked by the blower section 210, the pressure P1 in the first flow path portion 220 becomes a negative pressure (that is, a pressure lower than the surrounding atmospheric pressure). On the other hand, since the air guided by the second flow path portion 230 is compressed by the blower section 210, the pressure P2 in the second flow path portion 230 becomes a positive pressure (that is, a pressure higher than the surrounding atmospheric pressure). Therefore, the relationship of P1 <P2 is established. However, when an air flow is generated in the second flow path portion 230, in the drain 240 communicating the first flow path portion 220 and the second flow path portion 230, the second flow is caused by the air flow in the second flow path portion 230. Negative pressure P3 is generated on the road portion 230 side. The negative pressure P3 generates a force for sucking the fluid from the first flow path portion 220 to the second flow path portion 230. Therefore, the coolant CL liquefied in the first flow path portion 220 is sucked into the second flow path portion 230 without staying in the drain 240, and is recovered by the recovery section 300.

The machine tool 100 is generally provided with a bed 140 arranged vertically below the work processing unit 120, and is installed on a floor of a factory or the like via the bed 140. A column 150 extends from the bed 140 in the Y direction, and a spindle head 121 of the work processing portion 120 extends from the column 150 in the Z direction.

The surrounding member 110 is also called a splash guard, and prevents coolant CL, cutting chips Ch, and the like from scattering outside the machining space. The surrounding member 110 usually has a peripheral side wall and a ceiling wall surrounding the processing space S. The enclosing member may include a door that moves relative to the enclosing member itself. A setup station for preparing a pallet 160 for mounting the work W may be provided in the vicinity of the specific door.

The work processing unit 120 refers to a main part of the machine tool 100 provided in the processing space S. The work processing unit 120 refers to the spindle head 121 and the spindle 122 mounted on the column 150. When performing machining, a cutting tool (bite) 123 is attached to the spindle 122, and the cutting tool is brought into contact with the work W to perform cutting. A cutting tool 123 is detachably attached to the spindle 122. The cutting tool 123 is selected so that it can perform arbitrary machining such as cutting, drilling, and polishing. The work W is fixed to, for example, an ikele placed on the pallet 160. The pallet 160 is fixed to the work table 170. The work table 170 and the spindle 122 can be moved relative to each other by numerical control by a computer. The column 150 can move in the X direction on the bed 140. The spindle head 121 is movable in the Y direction. The work table 170 is movable in the Z direction. The column 150 and a part of the spindle head 121 are covered with the protector 180 and shielded from the processing space S.

In the illustrated example, the coolant supply unit 130 has, but is not limited to, the form of a nozzle for injecting the coolant CL toward the work W and the cutting tool 123. As another example, there are a form in which the coolant CL is injected from the tip of the tool 123 through the inside of the spindle 122, a form in which the coolant CL is injected from the ceiling in order to wash away the cutting chips Ch in the processing space S, and the like. Most of the coolant CL injected into the work W and the cutting tool 123 is collected by the collection unit 300 from the collection hole 300h provided below the spindle 122, separated from the cutting waste Ch, and then reused. .. On the other hand, a part of the coolant CL becomes mist in the processing space S and floats in the processing space S.

The purification unit 200 separates the mistized coolant CL from the air and liquefies it, and circulates the purified air in the processing space S. The liquefied coolant CL flows into the recovery unit 300 via the drain 240. Since the negative pressure P3 is generated on the second flow path portion 230 side of the drain, the coolant CL liquefied in the first flow path portion 220 is sucked into the second flow path portion 230 without staying in the drain 240. By making the negative pressure P3 smaller than P1, the force of sucking the fluid from the first flow path portion 220 to the second flow path portion 230 at the drain 240 is further increased.

In FIG. 4, the second flow path portion 230 has a structure that surrounds at least a part of the first flow path portion 220. Further, the air flow direction in the first flow path portion 220 and the air flow direction in the second flow path portion 230 are opposite to each other. Specifically, the first flow path portion 220 has a cylindrical first wall portion 221 and the second flow path portion 230 has a cylindrical first flow path portion 230 having an inner diameter larger than that of the first flow path portion 220. It has two wall portions 231. For example, 80% or more of the outer surface of the first flow path portion 220 is surrounded by the second flow path portion 230. That is, the cylindrical first wall portion 221 is contained in the hollow of the tubular second wall portion 231. Alternatively, the first flow path portion 220 is included in the second flow path portion 230. As a result, the total of the flow path lengths of the first flow path portion 220 and the second flow path portion 230 can be shortened, so that the purification section 200 can be miniaturized or made compact.

The blower unit 210 has a blower fan 211 such as a centrifugal fan, an intake unit 212, and an exhaust unit 213. The first flow path portion 220 defines an air flow path from the processing space S to the intake portion 212 of the blower portion 210. The second flow path portion 230 defines an air flow path from the exhaust section 213 of the blower section 210 to the processing space S.

The first wall portion 221 has a first end portion 221A corresponding to the inlet of the first flow path portion 220 communicating with the processing space S. Further, the first wall portion 221 has a second end portion 221B continuous with the intake portion 212 of the blower portion 210. On the other hand, the second wall portion 231 has a third end portion 231A continuous with the exhaust portion 213 of the blower portion 210. Further, the second wall portion 231 has a fourth end portion 231B corresponding to the outlet of the second flow path portion 230 communicating with the processing space S.

The first flow path portion 220 has a short cylindrical inner cylinder portion 222 that is surrounded by the first wall portion 221 and is arranged in front of the blower portion 210. The air in the first flow path portion 220 passes through the hollow of the first wall portion 221 and then passes through the hollow of the inner cylinder portion 222 and moves to the blower portion 210.

The length of the inner cylinder portion 222 housed in the hollow of the first wall portion 221 in the air flow direction is formed to be shorter than the length of the first wall portion 221. The length of the inner cylinder portion 222 is, for example, 40% or less of the distance L, where L is the length of the first flow path portion 220 in the air flow direction. The distance L corresponds to the length from the first end portion 221A corresponding to the inlet of the first flow path portion 220 of the first wall portion 221 to the second end portion 221B continuous with the intake portion 212 of the blower portion 210.

The inner cylinder portion 222 is provided so as to correspond to the most downstream region in the air flow direction in the first flow path portion 220. In this case, the air in the first flow path portion 220 passes through the hollow of the first wall portion 221 and then passes through the hollow of the inner cylinder portion 222 arranged in front of the blower portion 210 and moves to the blower portion 210. .. According to such a double structure, the inflow of the liquefied coolant CL into the blower portion 210 is suppressed. For example, the liquefied coolant CL that stays in the vicinity of the drain 240 cannot flow into the blower portion 210 unless it bypasses the inner cylinder portion 222.

Here, the most downstream region in the air flow direction in the first flow path portion 220 means a region of the first flow path portion 220 immediately before the blower portion 210. More specifically, for example, a region within 0.1 × L from the intake portion 212 of the blower portion 210 is referred to as a most downstream region.

In the first flow path portion 220, a first filter portion for supplementing the cutting chips Ch is provided. The air in the first flow path portion 220 passes through the hollow of the inner cylinder portion 222 after passing through the first filter portion. In this case, the air in the first flow path portion 220 passes through the hollow of the inner cylinder portion 222 and then moves to the blower portion 210 after passing through the first filter portion. Therefore, the liquefaction of the mist-ized coolant CL is promoted, and the inflow of cutting chips Ch into the blower portion 210 can be greatly suppressed.

For the first filter unit, a collision plate that collides with the cutting chips Ch flying from the machining space S and drops the cutting chips Ch, or a mesh-like structure such as a wire mesh that captures the cutting chips Ch can be used. The first filter unit prevents large objects such as cutting chips Ch from entering the purification unit. The first filter unit allows fine particles such as air and coolant CL mist to pass through.

The structure of the first filter portion is not particularly limited, but in the illustrated example, the collision plate 224 for suppressing the intrusion of cutting chips Ch and the guide blade 225 for swirling the air flow are arranged along the air flow direction. There is. In addition, instead of the collision plate 224, any member capable of suppressing the intrusion of cutting chips may be used, and for example, a net filter may be used.

Further, a second filter portion 223 may be arranged in the hollow of the inner cylinder portion 222, if necessary. The second filter unit 223 may have a structure that captures the mist of the unliquefied coolant CL, or may have a structure that promotes the liquefaction of the mist of the unliquefied coolant CL. In this case, the air that has passed through the second filter unit 223 moves to the blower unit 210.

The drain 240 is provided in the most downstream region of the first flow path portion 220 in the air flow direction and at the lowermost portion of the first flow path portion 220 in the vertical direction. As a result, the liquefied coolant CL can be efficiently guided to the drain 240 by utilizing its own weight.

Here, the lowermost portion of the first flow path portion 220 in the vertical direction is a region where the liquefied coolant CL is most likely to stay due to its own weight. Normally, the drain 240 is provided so that the lowest position in the vertical direction of the inner surface of the first wall portion 221 opens.

The lowermost portion of the first flow path portion 220 may have an inclined surface that tends downward in the vertical direction as it approaches the drain 240. As a result, the liquefied coolant CL can be more efficiently guided to the drain by utilizing its own weight.

A short cylindrical inner cylinder portion 222 exists directly above the drain 240, and the inner cylinder portion 222 is interposed between the drain 240 and the intake portion 212 of the blower portion 210. Therefore, it is suppressed that the liquefied coolant CL flows into the blower unit 210 together with the air.

The lowermost portion of the first flow path portion 220 has a groove portion 221G that extends along the air flow direction and communicates with the drain 240, if necessary. The groove portion 221G may be, for example, one that extends along the air flow direction and communicates with the drain 240 at the downstream end. The groove portion 221G extends along the air flow direction to the lowest position in the vertical direction on the inner surface of the first wall portion 221 of the first flow path portion 220. The bottom surface of the groove portion 221G has an inclined surface so that the liquefied coolant CL flows downward in the vertical direction under its own weight and is guided to the drain 240. By providing the groove portion 221G, the inflow of the liquefied coolant CL into the drain 240 is further promoted.

Further, on the inner surface of the second wall portion 231 of the second flow path portion 230, a groove portion 231G extending along the air flow direction is provided at the lowest position in the vertical direction, if necessary. The downstream end of the groove portion 231G extends to the fourth end portion 231B of the second flow path portion 230. That is, the liquefied coolant CL flows into the groove portion 221G by its own weight, then flows into the drain 240, flows into the second flow path portion 230, and then flows through the groove portion 231G to the fourth end of the second flow path portion 230. It is discharged from the portion 231B into the processing space S. The coolant CL discharged into the processing space S passes through the recovery hole 300h and flows into the recovery unit 300.

The purification unit 200 has a guide unit 221F extending in an oblique direction with respect to the flow direction of the air flowing through the first flow path unit 220. The guide portion 221F extends in a flange shape from the inlet of the first flow path portion 220. As a result, when viewed along the air flow direction in the first flow path portion 220, at least a part of the outlet of the second flow path portion 230 is shielded by the guide portion. The guide portion 221F is provided at the first end portion 221A of the first wall portion 221 corresponding to the entrance of the first flow path portion 220. The guide portion 221F may be formed over the entire circumference of the first end portion 221A, or may be partially formed. The guide portion 221F may extend in a flange shape from, for example, 50% or more (for example, 80% or more) of the entire circumference of the inlet of the first flow path portion 220.

The guide portion 221F is provided to avoid a collision between at least a part of the air flowing into the inlet of the first flow path portion 220 and at least a part of the air discharged from the outlet of the second flow path portion 230. .. The flange-shaped guide portion 221F promotes the inflow of air to the inlet of the first flow path portion 220. Further, the guide portion 221F reduces the pressure loss of the air flowing through the first flow path portion 220 and the second flow path portion 230. Therefore, the need to use an expensive and high-performance blower unit 210 is reduced, and a cheaper blower unit 210 can be used.

Similarly, a flange-shaped guide portion 231F extending in the same direction is also formed at the fourth end portion 231B of the second wall portion 231 corresponding to the outlet of the second flow path portion 230. As a result, the outlet of the second flow path portion 230 is shielded by the guide portion 221F when viewed along the air flow direction in the first flow path portion 220. Therefore, the collision between the air discharged from the second flow path portion 230 and the air flowing into the first flow path portion 220 is effectively avoided. Air is radially discharged from the outlet of the second flow path portion 230. It may be formed over the entire circumference of the guide portion 231F and the fourth end portion 231B, or may be partially formed.

The guide portion 221F may be a wall member extending from the inlet of the first flow path portion 220 so as to form an acute angle (for example, 30 to 45 °) with the flow direction of the air flowing through the first flow path portion 220. In this case, the guide portion 221F guides the air discharged from the outlet of the second flow path portion 230 so as to spread outward with respect to the inlet of the first flow path portion 220. By controlling the flow direction of the air discharged from the outlet of the second flow path portion 230 in this way, the air discharged from the outlet of the second flow path portion 230 and the air flowing into the inlet of the first flow path portion 220. Collision with air can be effectively avoided.

Since the flange-shaped guide portion 221F guides the air so that it is discharged in multiple directions, it also has an effect of efficiently stirring the air in the processing space S. For example, when viewed along the air flow direction in the first flow path portion 220, air is radially discharged from the outlet of the second flow path portion 230.

From the viewpoint of downsizing the machine tool 100, it is desirable that the purification unit 200 is built in the machine tool 100 or is arranged in the processing space S. As a device for purifying the air in the processing space S, it is common to use a mist collector which is installed separately from the machine tool and sucks air from the processing space S through a duct to purify the air. On the other hand, the purification unit 200 according to the present embodiment can be miniaturized, and the specifications are such that the first flow path portion 220 and the second flow path portion 230 communicate with each other in the processing space S. Can be placed.

Specifically, in the illustrated examples of FIGS. 1 to 3, the purification unit 200 is installed above the processing space S. The purification unit 200 is fixed to the ceiling of the surrounding member 110 with a predetermined jig. By accommodating the purification unit 200 in such a surplus space, the volume of the machine tool 100 is not increased, and the air in the processing space S is purified and the coolant CL is mistized without using an external mist collector. It will be possible to collect and collect.

The collection unit 300 includes a coolant tank 301 for storing the coolant CL (FIGS. 2 and 3). The coolant CL stored in the coolant tank 301 is sucked up by the pump P and supplied to the coolant supply unit 130 (FIG. 3). The coolant tank 301 includes a first transport unit 310 in which the transport belt moves in the horizontal direction and a second transport unit 320 in which the transport belt moves diagonally upward. A part of the cutting chips Ch is separated in the coolant tank 301 by using the first transport unit 310. The cutting chips Ch separated by the first transport unit 310 are transported to the discharge unit 330 by the second transport unit 320, fall from the opening provided below the discharge unit 330, and are collected in the chip bucket 340.

<Second Embodiment>
FIG. 5 is a schematic cross-sectional view of the purification unit according to the second embodiment. The purification unit 200 according to the present embodiment has the same configuration as that of the first embodiment except that the purification unit 200 has a cleaning unit for cleaning the first filter unit by spraying the liquid coolant CL on the first filter unit. The cleaning unit of the illustrated example includes a cleaning nozzle 226 in which the liquid coolant CL is sprayed on the collision plate 224 of the first filter unit.

Specifically, a coolant supply hole 221h penetrating the first wall portion 221 is provided above the first filter portion. Liquid coolant CL is sprayed from the cleaning nozzle 226 to the first filter portion through the coolant supply hole 221h, and the cutting debris Ch adhering to the first filter portion is washed away by the coolant CL. The washed-out cutting chips Ch may flow into the machining space S from the inlet of the first flow path portion 220.

As the coolant CL supplied to the cleaning unit (cleaning nozzle 226), the coolant CL stored in the coolant tank 301 may be used. The coolant flow path communicating with the pump P provided in the coolant tank 301 can be branched into a plurality of branches. With such a branch structure, the coolant CL can be sent to either one or both of the coolant supply unit 130 and the cleaning nozzle 226 at an arbitrary timing.

<Reference example>
FIG. 6 is a schematic cross-sectional view of the purification unit according to the first reference example. In the purification unit 200 according to the first reference example, the air blower unit 210 is arranged on the most upstream side in the air flow direction. The inside of the purification unit 200 has a positive pressure because air is sent from the air blower unit 210. In this case, there is an advantage that the structure can be simplified, and recovery of the liquefied coolant CL from the drain 240 is relatively easy. However, since the air containing a large amount of coolant CL mist and cutting chips Ch collides with the blower unit 210, the blower unit 210 is easily damaged, and there is a demerit that the cost required for maintenance of the blower unit 210 increases.

FIG. 7 is a schematic cross-sectional view of the purification unit according to the second reference example. In the purification unit 200 according to the second reference example, the air blower unit 210 is arranged on the most downstream side in the air flow direction. In this case as well, there is an advantage that the structure can be simplified, and the air containing a large amount of coolant CL mist and cutting chips Ch does not collide with the blower portion 210. However, the inside of the purification unit 200 has a negative pressure because air is sucked by the blower unit 210. If the inside of the purification unit 200 has a negative pressure, the liquefied coolant CL tends to stay in the drain 240, which makes it difficult to collect the liquefied coolant CL to the collection unit 300. If the drain 240 to the recovery unit 300 are communicated with each other by the drain pipe DP and sealed, the coolant CL can be constantly circulated in the drain pipe DP. However, it takes time to install the drain pipe DP.

The description of the embodiments described above is exemplary in all respects and is not restrictive. Modifications and changes can be made as appropriate for those skilled in the art. The scope of the invention is indicated by the claims, not by the embodiments described above. Further, the scope of the present invention includes modifications from the embodiments within the scope of the claims and within the scope of the claims.

The present invention may provide a machine tool useful for recovering and reusing mistized coolant.

100: Machine tool 110: Enclosing member 120: Work processing part 130: Coolant supply part 140: Bed 150: Column 160: Pallet 170: Table 180: Protector 200: Purification part 210: Blower part 211: Blower fan 212: Intake part 213 : Exhaust part 220: First flow path part 221: First wall part 221A: First end part 221B: Second end part 221G: Groove part 221F: Guide part 221h: Coolant supply hole 222: Inner cylinder part 223: Second filter Part 224: Collision plate 225: Guide blade 226: Cleaning nozzle 230: Second flow path part 231: Second wall part 231A: Third end part 231B: Fourth end part 231G: Groove part 231F: Guide part 240: Drain 300: Recovery section 300h: Recovery hole 301: Coolant tank 310: First transport section 320: Second transport section 330: Discharge section 340: Chip bucket CL: Coolant Ch: Cutting waste W: Work S: Machining space P: Pump DP: Drain pipe

Claims (8)

The surrounding member that surrounds the processing space for processing the work,
A work processing unit that processes a work in the processing space,
A coolant supply unit that supplies coolant to the processing space,
A purification unit that purifies the air in the processing space while circulating it,
A recovery unit that collects the liquefied coolant from the purification unit,
Equipped with
The purification unit
The air blower that circulates the air in the processing space and
A first flow path portion that moves the air from the processing space to the blower portion,
A second flow path portion that moves the air from the blower portion to the processing space, and
A drain that communicates the first flow path portion and the second flow path portion,
Equipped with
The coolant liquefied in the first flow path portion is a machine tool in which the drain flows from the first flow path portion to the second flow path portion and then flows into the recovery section. The second flow path portion surrounds at least a part of the first flow path portion.
The machine tool according to claim 1, wherein the air flow direction in the first flow path portion and the air flow direction in the second flow path portion are opposite directions. The first flow path portion has a first wall portion and a short cylindrical inner cylinder portion surrounded by the first wall portion and arranged in front of the blower portion.
The machine tool according to claim 1 or 2, wherein the air in the first flow path portion passes through the hollow of the first wall portion and then passes through the hollow of the inner cylinder portion and moves to the blower portion. The machine tool according to claim 3, wherein the drain is provided at the most downstream region in the air flow direction in the first flow path portion and at the lowermost portion in the vertical direction of the first flow path portion. The machine tool according to claim 4, wherein the lowermost portion of the first flow path portion has a groove portion extending along the air flow direction and communicating with the drain. A first filter unit that captures cutting chips provided in the first flow path unit, and a first filter unit.
The first filter unit has a cleaning unit for spraying the coolant to clean the first filter unit.
The machine tool according to claim 5, wherein the air in the first flow path portion passes through the hollow of the inner cylinder portion after passing through the first filter portion. The purification unit has a guide unit extending in an oblique direction with respect to the flow direction of air flowing through the first flow path portion.
The guide portion extends in a flange shape from the inlet of the first flow path portion, and when viewed along the air flow direction in the first flow path portion, the outlet of the second flow path portion. The machine tool according to any one of claims 1 to 6, wherein at least a part of the machine tool is shielded by the guide portion. The machine tool according to any one of claims 1 to 7, wherein the blower portion includes a centrifugal fan.

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