Coolant tanks and machine tools

Abstract

A coolant tank, a machine tool, and a coolant treatment device capable of supplying a sufficient amount of clean coolant to a machine tool body are provided. [Solution] The coolant tank comprises a first tank section (710) into which coolant from the processing area flows and which extends in a first direction (560), and a second tank section (720) into which coolant from the first tank section (710) flows and which extends in a second direction (570) intersecting the first direction (560), the second tank section (720) having a first region (721) with a pumping section (730) that pumps up coolant, and a second region (722) with an inlet section (740) into which coolant that has been treated for foreign matter contained in the coolant flows, and a flow forming section (750) that forms a flow of coolant in a third direction (580) intersecting the second direction (570) for the coolant flowing in the first region (721) in the second direction (570).

Description

Technical Field

[0001] This invention relates to a coolant tank, a machine tool, and a coolant processing device.

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2011-177810 (Patent Document 1) discloses a coolant purification device including a vortex tank, a clean tank provided above the vortex tank, and a pumping pump disposed on the outer peripheral side of the vortex in the vortex tank for pumping up the coolant in the vortex tank and allowing it to flow into the clean tank. The clean tank is provided with a drain portion for circulating the overflowed coolant back to the vortex tank.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the coolant purification device disclosed in the above Patent Document 1, the coolant is pumped from the vortex tank to the clean tank, and the overflowed coolant in the clean tank is returned to the vortex tank. However, depending on the relative positional relationship among the position where the coolant from the machine tool main body flows into the vortex tank, the pumping position of the coolant in the vortex tank, and the return position of the coolant in the vortex tank, the dirty coolant from the machine tool main body may be mixed with the purified clean coolant. In this case, there may be a shortage in the supply capacity of the clean coolant to the machine tool main body in the coolant purification device.

[0005] An object of the present invention is to provide a coolant tank, a machine tool, and a coolant treatment device capable of sufficiently supplying a clean coolant to a machine tool body.

Means for Solving the Problems

[0006] The coolant tank according to the present invention includes a first tank portion into which the coolant flowing from the processing area flows and which extends in a first direction, and a second tank portion into which the coolant flowing in the first tank portion flows and which extends in a second direction intersecting the first direction. The second tank portion has a first region where a pumping portion for pumping up the coolant is provided and a second region where an inflow portion into which the coolant having been processed for foreign matters contained therein flows. A flow forming portion for forming a coolant flow in a third direction intersecting the second direction with respect to the coolant flowing in the second direction in the first region is provided to form a boundary between the first region and the second region.

[0007] The machine tool according to the present invention includes a machine tool body for machining a workpiece, and the above-described coolant tank, and a coolant treatment device for treating the coolant used for workpiece machining in the machine tool body.

[0008] The coolant treatment device according to the present invention includes a first tank, a second tank stacked above the first tank, a first pump provided in the first tank for pumping up the coolant stored in the first tank to the second tank, a foreign matter capturing device for capturing foreign matters contained in the coolant from the first pump, and a coolant return mechanism provided in the second tank for returning the coolant overflowed in the second tank to the first tank. The first tank has a first tank region where a position where the coolant from the machine tool body flows in is set, a second tank region where a position where the coolant is returned from the second tank by the coolant return mechanism is set, and a third tank region disposed between the first tank region and the second tank region in a top view and where a position where the first pump is provided is set.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a coolant tank, a machine tool, and a coolant processing device that can sufficiently supply clean coolant to the machine tool body.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0011] Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

[0012] (Embodiment 1) FIG. 1 is a perspective view showing a machine tool using a coolant processing apparatus according to Embodiment 1 of the present invention.

[0013] Referring to FIG. 1, a coolant processing apparatus 100 in the present embodiment is used in a machine tool 200. The machine tool 200 is a lathe that performs workpiece machining by bringing a tool into contact with a rotating workpiece. The machine tool 200 is an NC (Numerically Controlled) machine tool in which various operations for workpiece machining are automated by numerical control by a computer.

[0014] Note that the machine tool in which the coolant processing apparatus according to the present invention is used is not limited to the above lathe, and may be, for example, a machining center that performs workpiece machining by bringing a rotating tool into contact with a workpiece, or a composite machining machine having a turning function and a milling function, or an AM / SM hybrid machining machine capable of performing additive machining (AM (Additive manufacturing) machining) and subtractive machining (SM (Subtractive manufacturing) machining) of a workpiece.

[0015] The machine tool 200 includes a machine tool body 210, a chip conveyor 230, and a coolant processing apparatus 100. The machine tool body 210 is the main body portion of the machine tool 200 and performs machining of a workpiece.

[0016] The machine tool body 210 includes a cover body 211, a door 213, a tool rest (not shown) for holding a tool in a machining area 220, a workpiece spindle (not shown) for rotating a workpiece in the machining area 220, and a bed (not shown) that supports the tool rest and the workpiece spindle.

[0017] The cover body 211 demarcates and forms the processing area 220 and constitutes the exterior of the machine tool 200. The processing area 220 is a space where the workpiece is processed, and is sealed by the cover body 211 and the door 213 so that foreign matters such as chips or coolant accompanying the workpiece processing do not leak outside the processing area 220.

[0018] An opening 212 is provided in the cover body 211. The opening 212 opens the processing area 220 to the external space. The door 213 is provided at the opening 212. The door 213 is attached to the cover body 211 so as to be slidable in the horizontal direction. When the door 213 slides, the opening 212 is brought into an open state or a closed state.

[0019] The chip conveyor 230 discharges chips and coolant generated during workpiece processing in the processing area 220 to the outside of the machine tool main body 210.

[0020] As shown in FIG. 1 and FIG. 5 to be described later, the chip conveyor 230 includes a cover portion 231 and a conveying device 236. The cover portion 231 constitutes the exterior of the chip conveyor 230. The cover portion 231 forms an internal space in which the conveying device 236 is disposed. A chip inlet 233 and a chip outlet 234 are provided in the cover portion 231.

[0021] The chip conveyor 230 is positioned with respect to the machine tool main body 210 such that the chip inlet 233 opens upward directly below the processing area 220 and the chip outlet 234 opens downward at a position horizontally offset from the machine tool main body 210. A chip bucket (not shown) for collecting chips is disposed below the chip outlet 234.

[0022] The chips and coolant generated in the machining area 220 are received inside the cover portion 231 through the chip inlet 233. The chips are conveyed by the conveying device 236 from the chip inlet 233 toward the chip outlet 234. The chips are discharged outside the cover portion 231 through the chip outlet 234 and collected in the chip bucket. On the other hand, the coolant received inside the cover portion 231 is discharged to the first tank 110 through the coolant outlet 232. The coolant outlet 232 and the first tank 110 will be described in detail later.

[0023] The chip conveyor 230 has a plurality of wheels 241. The plurality of wheels 241 are provided so as to contact the floor surface FL of a factory or the like where the machine tool main body 210 is installed. The plurality of wheels 241 are provided at positions separated from each other in the horizontal direction. The chip conveyor 230 is pulled out from the machine tool main body 210 by being slid in the second direction 520 together with the first tank 110 described later.

[0024] FIG. 2 is a perspective view showing the coolant processing device in FIG. 1. FIG. 3 is a system diagram showing the flow of coolant processing in the coolant processing device in FIG. 1.

[0025] Referring to FIGS. 1 to 3, the coolant processing device 100 is installed beside the machine tool main body 210. The coolant processing device 100 is a device for processing the coolant used for workpiece machining in the machine tool main body 210. The coolant discharged from the machine tool main body 210 during workpiece machining is guided to the coolant processing device 100 and stored therein. The coolant processing device 100 cleans the coolant from the machine tool main body 210 and supplies the clean coolant to the machine tool main body 210 again.

[0026] In FIGS. 1 and 2, FIGS. 4 to 7 described later, and FIG. 10, a first direction 510, a second direction 520, and a third direction 530 are indicated by arrows. The first direction 510 is parallel to the horizontal direction. The second direction 520 is parallel to the horizontal direction and orthogonal to the first direction 510. The third direction 530 is parallel to the vertical direction. In a state where the coolant processing device 100 is installed together with the machine tool main body 210, the first direction 510 corresponds to the rotation axis direction (Z-axis direction) of the work spindle. The first direction 510 corresponds to the left-right direction (width direction) of the machine tool main body 210, and the second direction 520 corresponds to the front-rear direction (depth direction) of the machine tool main body 210.

[0027] The coolant processing device 100 includes a first tank 110 and a second tank 160. Each of the first tank 110 and the second tank 160 is a box capable of storing coolant.

[0028] The first tank 110 is placed on the floor surface FL. In a top view, a part of the first tank 110 overlaps with a part of the machine tool main body 210. The second tank 160 is stacked above the first tank 110. In a top view, the second tank 160 overlaps with a part of the first tank 110. In a top view, the second tank 160 is provided at a position shifted from the machine tool main body 210.

[0029] The area of the second tank 160 in a top view is smaller than the area of the first tank 110 in a top view. The capacity of the coolant that can be stored in the second tank 160 is less than the capacity of the coolant that can be stored in the first tank 110. The capacity of the coolant that can be stored in the second tank 160 may be equal to or greater than the capacity of the coolant that can be stored in the first tank 110.

[0030] The first tank 110 has a tank body 120 and a lid 130. The tank body 120 has a box shape having a bottom surface 121 and side surfaces 122. The bottom surface 121 is disposed at the bottom of the tank body 120. The side surfaces 122 rise from the periphery of the bottom surface 121. A first storage space 126 is formed at a position on the bottom surface 121 and surrounded by the side surfaces 122. The first tank 110 stores coolant in the first storage space 126. The lid 130 is attached to the upper end of the side surface 122. The lid 130 faces the bottom surface 121 in the third direction 530.

[0031] The first tank 110 has a plurality of wheels 111. The plurality of wheels 111 are provided so as to contact the floor surface FL. The plurality of wheels 111 are provided at positions separated from each other in the horizontal direction. The first tank 110 is pulled out from the machine tool main body 210 by being slid in the second direction 520. The pulling direction of the first tank 110 may be the first direction 510.

[0032] The second tank 160 has a tank body 170 and a lid 180. The tank body 170 has a box shape having a bottom surface 171 and side surfaces 172. The bottom surface 171 is disposed at the bottom of the tank body 170. The bottom surface 171 faces the lid 130 of the first tank 110 in the third direction 530. The side surfaces 172 rise from the periphery of the bottom surface 171. A second storage space 176 is formed at a position on the bottom surface 171 and surrounded by the side surfaces 172. The second tank 160 stores coolant in the second storage space 176. The lid 180 is attached to the upper end of the side surface 172. The lid 180 faces the bottom surface 171 in the third direction 530.

[0033] The distance between the lid 130 and the bottom surface 171 in the third direction 530 is smaller than the distance between the bottom surface 171 and the lid 180 in the third direction 530. The distance between the bottom surface 171 and the lid 180 in the third direction 530 is larger than the distance between the bottom surface 121 and the lid 130 in the third direction 530. The distance between the bottom surface 171 and the lid 180 in the third direction 530 may be equal to or less than the distance between the bottom surface 121 and the lid 130 in the third direction 530.

[0034] The two-story structure of the coolant tank composed of the first tank 110 and the second tank 160 can reduce the installation area of the coolant processing device 100 when viewed from above, while expanding the tank capacity.

[0035] The coolant processing device 100 further includes a coolant temperature adjustment device 190. The coolant temperature adjustment device 190 is a device for adjusting the temperature of the coolant and cools the coolant that has risen in temperature during workpiece processing. The coolant temperature adjustment device 190 is provided in the second tank 160. The coolant temperature adjustment device 190 cools the coolant stored in the second tank 160. The coolant temperature adjustment device 190 is attached to the upper part of the second tank 160. The coolant temperature adjustment device 190 is attached to the lid 180. The coolant temperature adjustment device 190 has a box shape rising from the lid 180.

[0036] The coolant temperature adjustment device 190 is of the immersion type and has a heat exchange coil (cooling coil) immersed in the coolant. In such a configuration, since the heat exchange coil is immersed in the clean coolant stored in the second tank 160, chips are less likely to clog the heat exchange coil. As a result, the heat exchange efficiency of the heat exchange coil is maintained over a long period, and the maintenance burden can be reduced. In addition, since the immersion-type coolant temperature adjustment device 190 is attached to the upper part (lid 180) of the second tank 160, the installation area of the coolant processing device 100 when viewed from above can be further reduced.

[0037] FIG. 4 is a plan view showing the interior of the first tank in FIG. 2. Referring to FIGS. 2 to 4, the first tank 110 has a first tank region 310, a second tank region 320, and a third tank region 330.

[0038] The third tank region 330 is disposed between the first tank region 310 and the second tank region 320 in the second direction 520. The first tank region 310, the third tank region 330, and the second tank region 320 are arranged in the second direction 520 in the order listed. One end of the third tank region 330 in the second direction 520 is connected to the first tank region 310, and the other end of the third tank region 330 in the second direction 520 is connected to the second tank region 320.

[0039] The first tank region 310 and the second tank region 320 are separated from each other with the third tank region 330 sandwiched therebetween. The first tank region 310 forms a boundary only with the third tank region 330 among the second tank region 320 and the third tank region 330. The second tank region 320 forms a boundary only with the third tank region 330 among the first tank region 310 and the third tank region 330. The third tank region 330 forms a boundary with both the first tank region 310 and the second tank region 320.

[0040] The first tank region 310 extends in the first direction 510. The first tank region 310 protrudes in the first direction 510 more than the third tank region 330. The first tank region 310 has an elongated shape in which the first direction 510 is the longitudinal direction and the second direction 520 is the short-side direction (width direction) in a top view. The maximum length of the first tank region 310 in the first direction 510 is greater than the maximum length of the first tank region 310 in the second direction 520.

[0041] The second tank region 320 extends in the first direction 510. The second tank region 320 protrudes in the first direction 510 more than the third tank region 330. The protruding direction of the second tank region 320 in the first direction 510 is opposite to the protruding direction of the first tank region 310 in the first direction 510.

[0042] The length of the third tank region 330 in the first direction 510 is smaller than the length of the second tank region 320 in the first direction 510 and smaller than the length of the first tank region 310 in the first direction 510. The length of the second tank region 320 in the first direction 510 is smaller than the length of the first tank region 310 in the first direction 510. The length of the second tank region 320 in the second direction 520 is larger than the length of the first tank region 310 in the second direction 520 and larger than the length of the third tank region 330 in the second direction 520.

[0043] FIG. 5 is a cross-sectional view showing the first tank and the chip conveyor in FIG. 1. In FIGS. 4 and 5, the coolant flow in the first tank 110 is indicated by arrows, and the discharge directions of the coolant from the first nozzle 61 and the second nozzle 62 described later are indicated by white arrows.

[0044] Referring to FIGS. 2 to 5, a position 370 is set in the first tank region 310 where the coolant from the machine tool main body 210 flows in. The first tank region 310 is positioned directly below the machining area 220.

[0045] The chip conveyor 230 is housed in the first tank region 310. A coolant discharge port 232 is provided in the cover portion 231. The coolant discharge port 232 opens facing the second direction 520. The coolant discharge port 232 opens facing the side surface 122 of the tank body 120. The coolant discharge port 232 has, for example, a rectangular opening shape in which the first direction 510 is the longitudinal direction and the third direction 530 is the short side direction. A plurality of coolant discharge ports 232 may be provided at intervals in the first direction 510.

[0046] The coolant received from the machine tool main body 210 (machining area 220) into the interior of the cover portion 231 of the chip conveyor 230 flows into the first tank area 310 through the coolant discharge port 232. The opening surface of the coolant discharge port 232 in the cover portion 231 corresponds to the position 370 where the coolant from the machine tool main body 210 flows in.

[0047] The coolant treatment device 100 further includes a first pump 51. The first pump 51 is provided in the first tank 110. The first pump 51 is attached to the lid 130. The first pump 51 is a submerged pump and has a pump portion (not shown) submerged in the coolant. The first pump 51 pumps up the coolant stored in the first tank 110 to the second tank 160.

[0048] A position 380 where the first pump 51 is provided is set in the third tank area 330. The first pump 51 is provided at a position closer to the second tank area 320 than the first tank area 310 in the second direction 520.

[0049] The side surface 122 has a second side surface portion 122j and a third side surface portion 122k. The second side surface portion 122j and the third side surface portion 122k are provided in the third tank area 330. The second side surface portion 122j and the third side surface portion 122k face each other with a space therebetween in the first direction 510. A first storage space 126 in the third tank area 330 is formed between the second side surface portion 122j and the third side surface portion 122k. The first pump 51 is provided at a position closer to the second side surface portion 122j than the third side surface portion 122k in the first direction 510. The position 380 where the first pump 51 is provided is displaced from the position 370 where the coolant from the machine tool main body 210 flows in in the first direction 510 and the second direction 520.

[0050] The coolant treatment device 100 further includes a gutter 31. The gutter 31 is provided in the first tank 110. The gutter 31 can guide the coolant from the machine tool main body 210 toward the first pump 51.

[0051] The gutter 31 is provided in the first tank region 310. The gutter 31 is attached to the side surface 122. The gutter 31 extends in the first direction 510. The gutter 31 is provided below the coolant discharge port 232. The gutter 31 has a saucer-shaped cross section when cut by a plane orthogonal to the first direction 510. The gutter 31 forms a flow path through which the coolant can flow. The gutter 31 is configured to receive the coolant from the coolant discharge port 232 and guide the coolant in a direction along the first direction 510 and approaching the third tank region 330.

[0052] The coolant treatment device 100 further has a plurality of first nozzles 61 (61A, 61B, 61C). The first nozzle 61 is provided in the first tank 110. The first nozzle 61 discharges the coolant so as to form a coolant flow from the first tank region 310 toward the first pump 51.

[0053] The first nozzle 61 is provided on the bottom surface 121. The plurality of first nozzles 61 are provided at intervals in the planar direction of the bottom surface 121. The first nozzle 61 is provided in the first tank region 310. The first nozzle 61 discharges the coolant so as to form a coolant flow in a direction approaching the second tank region 320 in the first tank region 310.

[0054] The first nozzle 61A, the first nozzle 61B, and the first nozzle 61C are provided at intervals in the first direction 510. The first nozzle 61A is arranged on the most upstream side of the coolant flow from the first tank region 310 toward the first pump 51 among the first nozzle 61A, the first nozzle 61B, and the first nozzle 61C. The first nozzle 61C is arranged on the most downstream side of the coolant flow from the first tank region 310 toward the first pump 51 among the first nozzle 61A, the first nozzle 61B, and the first nozzle 61C. The first nozzle 61B is arranged between the first nozzle 61A and the first nozzle 61C in the first direction 510.

[0055] The first nozzle 61A discharges the coolant so as to form a coolant flow in a direction along the first direction 510 and approaching the third tank region 330. The first nozzle 61B discharges the coolant so as to form a coolant flow in a direction along the first direction 510 and approaching the third tank region 330. The first nozzle 61C discharges the coolant so as to form a coolant flow in a direction along the second direction 520 and approaching the third tank region 330. The coolant discharge port 61a of the first nozzle 61C is open facing the first pump 51.

[0056] The first tank 110 further has a partition wall 46. The partition wall 46 has a wall shape rising from the bottom surface 121. The partition wall 46 is provided along the boundary between the first tank region 310 and the third tank region 330. The partition wall 46 is provided at a position shifted from the straight line connecting the first nozzle 61C in the first tank region 310 and the first pump 51 in the third tank region 330. The partition wall 46 extends from the third side surface portion 122k and extends in the first direction 510. The partition wall 46 is provided at a position away from the second side surface portion 122j in the first direction 510. The partition wall 46 functions to more surely guide the coolant from the first tank region 310 toward the first pump 51.

[0057] The first tank region 310 includes a corner region 310p. The corner region 310p is an end portion of the first tank region 310 in the first direction 510 and is defined at a position farthest from the third tank region 330. The length (width) of the first tank region 310 in the second direction 520 is locally reduced in the corner region 310p. By providing the corner region 310p in the first tank region 310, the tank capacity can be further expanded.

[0058] The coolant processing device 100 further includes a third nozzle 63. The third nozzle 63 is provided in the first tank region 310. The third nozzle 63 discharges the coolant so as to form a coolant flow directed toward the corner region 310p. According to such a configuration, by discharging the coolant toward the corner region 310p where stagnation occurs in the coolant flow, the coolant stored in the corner region 310p can be forcibly circulated.

[0059] FIG. 6 is a cross-sectional view showing the coolant processing device as viewed in the arrow direction on the line VI-VI in FIG. 2. Referring to FIGS. 2 to 6, the second tank 160 is provided in the second tank region 320. In a top view, the second tank 160 overlaps a part of the second tank region 320.

[0060] The coolant processing device 100 further includes a coolant return mechanism 21. The coolant return mechanism 21 is provided in the second tank 160. The coolant return mechanism 21 is configured to return the coolant that has overflowed in the second tank 160 to the first tank 110.

[0061] An opening 173 is provided in the second tank 160. The opening 173 is a through hole that penetrates the side surface 172 and communicates with the second storage space 176. The opening 173 is provided at a position closer to the lid 180 than the bottom surface 171 in the third direction 530. An opening 131 is provided in the first tank 110. The opening 131 is a through hole that penetrates the lid 130 and communicates with the first storage space 126.

[0062] The coolant return mechanism 21 includes the above-described opening 173 and opening 131, and a drain pipe 22. The drain pipe 22 extends in the third direction 530. The drain pipe 22 extends between the opening 173 and the opening 131. When the water level of the coolant in the second tank 160 exceeds a predetermined height, the coolant enters the first storage space 126 through the opening 173, the drain pipe 22, and the opening 131 in this order from the second storage space 176.

[0063] As shown in FIGS. 4 and 6, in the second tank region 320, a position 360 is set where the coolant is returned from the second tank 160 by the coolant return mechanism 21. The opening surface of the opening 131 in the lid 130 corresponds to the position 360 where the coolant is returned from the second tank 160 by the coolant return mechanism 21.

[0064] FIG. 7 is a perspective view showing the coolant treatment apparatus as viewed in the direction indicated by the arrow VII in FIG. 2. Referring to FIG. 7, the coolant treatment apparatus 100 further includes a foreign matter capturing device 41. The foreign matter capturing device 41 is a device for capturing foreign matters such as chips or sludge contained in the coolant. The foreign matter capturing device 41 captures foreign matters contained in the coolant from the first pump 51.

[0065] The foreign matter capturing device 41 is a filterless type that does not include a filtration filter. The foreign matter capturing device 41 is a cyclone separator that uses centrifugal force to capture foreign matters. As a whole, the foreign matter capturing device 41 has a cylindrical shape extending in the third direction 530. The foreign matter capturing device 41 is composed of an elongated body with the third direction 530 as the longitudinal direction.

[0066] The foreign matter capturing device 41 includes a foreign matter separation part 42, a foreign matter collection part 43, a coolant inflow part 45, and a coolant outflow part 44. The coolant treatment apparatus 100 further includes a first pipe 410 and a second pipe 420.

[0067] The foreign matter separation part 42 and the foreign matter collection part 43 are connected in series in the third direction 530. The lower end part of the foreign matter separation part 42 is connected to the upper end part of the foreign matter collection part 43. The coolant inflow part 45 is connected to the outer peripheral surface of the foreign matter separation part 42. The coolant outflow part 44 is connected to the upper end part of the foreign matter separation part 42.

[0068] The first pipe 410 extends between the first pump 51 and the coolant inlet portion 45. The second pipe 420 extends between the coolant outlet portion 44 and the second tank 160 (lid 180). Each of the first pipe 410 and the second pipe 420 is made of a steel pipe, a hose, or the like through which the coolant can flow.

[0069] The coolant from the first pump 51 flows through the first pipe 410 and enters the foreign matter separation section 42 through the coolant inlet portion 45. The coolant flows spirally inside the foreign matter separation section 42, and during this time, the coolant and the foreign matter contained in the coolant are separated from each other by centrifugal force. The cleaned coolant flows out of the foreign matter separation section 42 through the coolant outlet portion 44, flows through the second pipe 420, and is supplied to the second tank 160. The foreign matter separated from the coolant falls by gravity and is collected in the foreign matter collection section 43.

[0070] The second tank 160 is provided with a notch portion 161. The notch portion 161 has a notch shape in which one of the four corners of a rectangle is cut out when the second tank 160 is viewed from above. The foreign matter capture device 41 is disposed in the notch portion 161 in a top view. The foreign matter collection section 43 is provided above the lid 130 and at a position facing the second tank 160 in the first direction 510 and the second direction 520. The foreign matter separation section 42 is disposed above the lid 180. The foreign matter separation section 42 is provided at a position facing the coolant temperature adjustment device 190 in the first direction 510 and facing the second pump 52 described later in the second direction 520.

[0071] Referring to FIGS. 2 to 4, the coolant processing apparatus 100 further includes a second pump 52 and a plurality of third pumps 53.

[0072] The second pump 52 is provided in the second tank 160. The second pump 52 is attached to the lid 180. The second pump 52 is a submerged pump. The second pump 52 supplies the coolant stored in the second tank 160 to the machine tool main body 210.

[0073] The coolant from the second pump 52 is supplied in the machine tool main body 210 toward at least one of the tool and the workpiece. For example, the coolant from the second pump 52 is supplied to the cutting edge coolant nozzle 253 and the through-spindle coolant device 254. The cutting edge coolant nozzle 253 is provided on the tool rest of the machine tool main body 210. The cutting edge coolant nozzle 253 is configured to discharge the coolant toward the cutting edge of the tool held by the tool rest. The through-spindle coolant device 254 is provided on the workpiece spindle of the machine tool main body 210. The through-spindle coolant device 254 is configured to discharge the coolant from the chuck of the workpiece spindle toward the workpiece.

[0074] The plurality of third pumps 53 are provided in the first tank 110. The third pump 53 is attached to the lid 130. The third pump 53 is a submerged pump. The third pump 53 supplies the coolant stored in the second tank region 320 to the machine tool main body 210.

[0075] The coolant from the third pump 53 is supplied in the machine tool main body 210 toward a position away from the tool and the workpiece. For example, the coolant from the third pump 53 is supplied to the base coolant nozzle 251 and the machine body coolant circulation device 252. The base coolant nozzle 251 is configured to discharge the coolant toward a bed or the like disposed in the machining area 220 and / or a cover body 211 that partitions the machining area 220. The machine body coolant circulation device 252 is configured to circulate the coolant through a coolant circulation path provided in the bed for the purpose of equalizing the temperature of the casting constituting the bed and suppressing a change in the posture of the machine tool main body 210.

[0076] The minimum opening area of the flow path of the coolant supplied from the second pump 52 to the machine tool main body 210 may be smaller than the minimum opening area of the flow path of the coolant supplied from the third pump 53 to the machine tool main body 210.

[0077] Referring to FIG. 4, the coolant processing device 100 further includes a plurality of second nozzles 62 (62A, 62B, 62C, 62D). The second nozzles 62 are provided in the first tank 110. The second nozzles 62 discharge coolant so as to form a swirling flow that flows along the periphery of the second tank region 320 when viewed from above.

[0078] The second nozzles 62 are provided on the bottom surface 121. The plurality of second nozzles 62 are provided at intervals from each other in the planar direction of the bottom surface 121. The second nozzles 62 are provided in the second tank region 320. The plurality of second nozzles 62 are provided at intervals from each other along the periphery of the bottom surface 121 in the second tank region 320.

[0079] The bottom surface 121 in the second tank region 320 has a rectangular shape. The second nozzles 62A, second nozzles 62B, second nozzles 62C, and second nozzles 62D are arranged in the circumferential direction of the periphery of the bottom surface 121 in the order listed. The second nozzles 62A, second nozzles 62B, second nozzles 62C, and second nozzles 62D are respectively provided at the four corners of the bottom surface 121 in the second tank region 320. The coolant discharge port 62a of the second nozzle 62A opens facing the second nozzle 62B, the coolant discharge port 62a of the second nozzle 62B opens facing the second nozzle 62C, the coolant discharge port 62a of the second nozzle 62C opens facing the second nozzle 62D, and the coolant discharge port 62a of the second nozzle 62D opens facing the second nozzle 62A.

[0080] As shown in FIGS. 3 to 5, the coolant from the machine tool main body 210 (machining area 220) is received by the chip conveyor 230, and further flows into the first tank 110 (first tank region 310) through the coolant discharge port 232 provided in the cover portion 231. The coolant that has flowed into the first tank 110 moves from the first tank region 310 toward the third tank region 330 where the first pump 51 is provided.

[0081] The first pump 51 pumps the coolant that has moved to the third tank area 330 up to the second tank 160. At this time, the foreign matter capturing device 41 captures the foreign matter contained in the coolant from the first pump 51, so that clean coolant is supplied to the second tank 160. The second pump 52 supplies the coolant stored in the second tank 160 toward at least one of the tool and the workpiece in the machine tool body 210, such as the cutting edge coolant nozzle 253 and the through spindle coolant device 254.

[0082] When the water level of the coolant in the second tank 160 exceeds a predetermined height, the coolant return mechanism 21 returns the coolant that has overflowed in the second tank 160 to the first tank 110 (the second tank area 320). The third pump 53 supplies the coolant stored in the second tank area 320 of the first tank 110 toward a position away from the tool and the workpiece in the machine tool body 210, such as the base coolant nozzle 251 and the machine body coolant circulation device 252.

[0083] Summarizing the configuration of the coolant processing device 100 in the first embodiment of the present invention described above, the coolant processing device 100 in the present embodiment includes a first tank 110, a second tank 160 stacked above the first tank 110, a first pump 51 provided in the first tank 110 and pumping the coolant stored in the first tank 110 up to the second tank 160, a foreign matter capturing device 41 that captures foreign matter contained in the coolant from the first pump 51, and a coolant return mechanism 21 provided in the second tank 160 and returning the coolant that has overflowed in the second tank 160 to the first tank 110. The first tank 110 has a first tank area 310 where a position 370 where the coolant from the machine tool body 210 flows in is set, a second tank area 320 where a position 360 where the coolant is returned from the second tank 160 by the coolant return mechanism 21 is set, and a third tank area 330 disposed between the first tank area 310 and the second tank area 320 in a top view and where a position 380 where the first pump 51 is provided is set.

[0084] Thus, the third tank area 330 where the position 380 where the first pump 51 is provided is set is disposed between the first tank area 310 where the position 370 where the coolant from the machine tool main body 210 flows in is set and the second tank area 320 where the position 360 where the coolant is returned from the second tank 160 by the coolant return mechanism 21 is set, in a top view. With such a configuration, the dirty coolant that has flowed into the first tank area 310 of the first tank 110 from the machine tool main body 210 can be efficiently guided to the first pump 51 in the third tank area 330 and pumped up to the second tank 160 by the first pump 51. Thereby, the clean coolant from which foreign matters have been captured by the foreign matter capturing device 41 can be supplied to the second tank 160. Further, due to the configuration in which the third tank area 330 is disposed between the first tank area 310 and the second tank area 320 in a top view, the second tank area 320 is disposed on the opposite side of the first tank area 310 with the third tank area 330 interposed therebetween. In such a configuration, the dirty coolant from the first tank area 310 is pumped up to the second tank 160 by the first pump 51 in the third tank area 330, thereby suppressing the entry of the dirty coolant into the second tank area 320.

[0085] As a result, it becomes possible to cause the second tank 160 to function as a clean tank for storing coolant having a high cleanliness and cause the second tank area 320 in the first tank 110 to function as a semi-clean tank for storing coolant having an intermediate cleanliness. Thereby, it is possible to sufficiently supply clean coolant from the coolant processing device 100 to the machine tool main body 210.

[0086] Further, the second tank 160 is stacked above the second tank area 320. According to such a configuration, by bringing the second tank 160 close to the position 360 where the coolant is returned from the second tank 160 by the coolant return mechanism 21, the coolant return mechanism 21 can be configured more simply.

[0087] Further, the coolant processing device 100 further includes a trough 31 provided in the first tank 110 for guiding the coolant from the machine tool main body 210 toward the first pump 51. According to such a configuration, the trough 31 can forcibly direct the coolant from the machine tool main body 210 toward the first pump 51. Thereby, the dirty coolant flowing into the first tank region 310 from the machine tool main body 210 can be more efficiently guided to the first pump 51 in the third tank region 330.

[0088] Further, the coolant processing device 100 further includes a first nozzle 61 provided in the first tank 110 for discharging the coolant so as to form a coolant flow directed from the first tank region 310 toward the first pump 51.

[0089] According to such a configuration, the dirty coolant flowing into the first tank region 310 from the machine tool main body 210 can be more efficiently guided to the first pump 51 in the third tank region 330.

[0090] Further, the coolant processing device 100 further includes a second nozzle 62 provided in the first tank 110 for discharging the coolant so as to form a swirling flow that flows along the periphery of the second tank region 320 when viewed from above.

[0091] According to such a configuration, by actively forming a swirling flow in the second tank region 320, it is possible to suppress the coolant stored in the second tank region 320 from flowing toward the first pump 51. Thereby, it is possible to prevent a decrease in the pumping efficiency of the dirty coolant by the first pump 51.

[0092] Further, the coolant processing device 100 further includes a second pump 52 provided in the second tank 160 for supplying the coolant stored in the second tank 160 to the machine tool main body 210, and a third pump 53 provided in the first tank 110 for supplying the coolant stored in the second tank region 320 to the machine tool main body 210.

[0093] According to such a configuration, the coolant stored in the second tank 160 and the coolant stored in the second tank region 320 of the first tank 110 can be supplied to the machine tool main body 210 independently of each other.

[0094] Also, the coolant from the second pump 52 is supplied toward at least one of the tool and the workpiece in the machine tool main body 210. The coolant from the third pump 53 is supplied toward a position away from the tool and the workpiece in the machine tool main body 210.

[0095] According to such a configuration, the influence of foreign matter contained in the coolant on the machining accuracy of the workpiece is relatively large in the coolant supplied toward at least one of the tool and the workpiece, and relatively small in the coolant supplied toward a position away from the tool and the workpiece. Therefore, by supplying a coolant having a high cleanliness toward at least one of the tool and the workpiece and supplying a coolant having an intermediate cleanliness toward a position away from the tool and the workpiece, the machining accuracy of the workpiece can be efficiently improved.

[0096] The coolant treatment device 100 further includes an immersion type coolant temperature adjustment device 190 attached to the upper part of the second tank 160. According to such a configuration, while improving the maintainability of the coolant temperature adjustment device 190, the installation area of the coolant treatment device 100 when viewed from above can be reduced.

[0097] Hereinafter, the features of the first tank region 310, the second tank region 320, and the third tank region 330 will be described. Referring to FIG. 4, the third tank region 330 has a rectangle having a pair of end sides extending in the first direction 510 and a pair of end sides extending in the second direction 520 in a top view. The first tank region 310 is connected to one end of the third tank region 330 in the second direction 520, and the second tank region 320 is connected to the other end of the third tank region 330 in the second direction 520. The first tank region 310 protrudes in one direction along the first direction 510 orthogonal to the second direction 520 more than the third tank region 330. The second tank region 320 protrudes in the other direction along the first direction 510 more than the third tank region 330.

[0098] The area of the third tank region 330 in a top view is smaller than the area of the first tank region 310 in a top view. The area of the third tank region 330 in a top view is smaller than the area of the second tank region 320 in a top view. The area of the second tank region 320 in a top view may be equal to or greater than the area of the first tank region 310 in a top view, or may be less than the area of the first tank region 310 in a top view.

[0099] In the first tank region 310, a coolant flow is formed in a direction along the first direction 510 and approaching the third tank region 330. In the second tank region 320, a coolant flow that swirls along the periphery of the second tank region 320 when viewed from above is formed. In the third tank region 330, a coolant flow is formed in a direction along the second direction 520 and approaching the first pump 51 from the first tank region 310.

[0100] (Embodiment 2) The machine tool in the present embodiment has the same structure as the machine tool 200 in Embodiment 1. Hereinafter, the description of the structure overlapping with the machine tool 200 in Embodiment 1 will not be repeated. In particular, in the present embodiment, the structure of the first tank 110 will be described from a different perspective from the description in Embodiment 1.

[0101] FIG. 8 is a plan view showing the inside of the first tank in the machine tool according to Embodiment 2 of the present invention. FIG. 8 corresponds to FIG. 4 in Embodiment 1.

[0102] In FIG. 8 and FIG. 9 to be described later, a first direction 560, a second direction 570, and a third direction 580 are indicated by arrows. The second direction 570 is a direction intersecting the first direction 560. The third direction 580 is a direction intersecting the second direction 570. The first direction 560, the second direction 570, and the third direction 580 are parallel to the horizontal direction.

[0103] In the present embodiment, as a representative example, the first direction 560 is a direction parallel to the rotation axis direction (Z-axis direction) of the work spindle, the second direction 570 is a direction orthogonal to the first direction 560, and the third direction 580 is a direction orthogonal to the second direction 570. In a state where the coolant processing device 100 is installed beside the machine tool main body 210, the first direction 560 corresponds to the left-right direction (width direction) of the machine tool main body 210, and the second direction 570 corresponds to the front-rear direction (depth direction) of the machine tool main body 210.

[0104] Note that the angle formed by the first direction 560 and the second direction 570 may be in the range of 90° ± 45°, may be in the range of 90° ± 30°, or may be in the range of 90° ± 10°. The angle formed by the second direction 570 and the third direction 580 may be in the range of 90° ± 30°, may be in the range of 90° ± 10°, or may be in the range of 90° ± 5°.

[0105] The first tank 110 has a first tank portion 710. The first tank portion 710 extends in the first direction 560. Coolant flowing from the machining area 220 flows into the first tank portion 710.

[0106] The first tank section 710 corresponds to the first tank area 310 described in Embodiment 1. The first tank section 710 has an elongated shape in a top view, where the first direction 560 is the longitudinal direction and the second direction 570 is the short-side direction (width direction). A position 370 is set in the first tank section 710 where coolant from the machine tool main body 210 (machining area 220) flows in. The first tank section 710 is positioned directly below the machining area 220. The chip conveyor 230 is accommodated in the first tank section 710.

[0107] The first tank 110 further has a second tank section 720. The second tank section 720 extends in the second direction 570 that intersects the first direction 560. Coolant that has flowed through the first tank section 710 flows into the second tank section 720.

[0108] The second tank section 720 corresponds to the second tank area 320 and the third tank area 330 described in Embodiment 1. The second tank section 720 is connected to the end of the first tank section 710 in the first direction 560. The second tank section 720 extends from the first tank section 710 in the second direction 570.

[0109] The second tank section 720 has a first region 721 and a second region 722. The first region 721 has a pumping section 730 that pumps up the coolant. The second region 722 has an inflow section 740 where coolant that has been processed for foreign matter contained in the coolant flows in.

[0110] The first region 721 corresponds to the third tank area 330 described in Embodiment 1. The second region 722 corresponds to the second tank area 320 described in Embodiment 1. The length (width) of the second region 722 in the first direction 560 is greater than the length (width) of the first region 721 in the first direction 560. The second region 722 protrudes more in the first direction 560 than the first region 721.

[0111] The first region 721 and the second region 722 are arranged side by side in the second direction 570. The first region 721 is disposed between the first tank portion 710 and the second region 722. The first tank portion 710 and the second region 722 are separated from each other with the first region 721 sandwiched therebetween. The first tank portion 710 forms a boundary only with the first region 721 among the first region 721 and the second region 722. The second region 722 forms a boundary only with the first region 721 among the first tank portion 710 and the first region 721. The first region 721 forms a boundary with both the first tank portion 710 and the second region 722.

[0112] In the first region 721, a position 380 where the first pump 51 described in Embodiment 1 is provided is set. A pumping-up portion 730 for pumping up the coolant corresponds to the position 380 where the first pump 51 is provided. In the second region 722, a position 360 where the coolant is returned from the second tank 160 described in Embodiment 1 is set. An inflow portion 740 into which the coolant having been subjected to treatment of foreign matters contained therein flows corresponds to the position 360 where the coolant is returned from the second tank 160.

[0113] The first tank 110 further has a flow forming portion 750. The flow forming portion 750 forms a flow of the coolant in a third direction 580 intersecting the second direction 570 with respect to the coolant flowing in the second direction 570 in order to form a boundary between the first region 721 and the second region 722.

[0114] The flow forming portion 750 is disposed at the boundary between the first region 721 and the second region 722. The flow forming portion 750 extends in the first direction 560. In FIG. 8, the flow forming portion 750 is shown as a strip-shaped region extending in the first direction 560 while having a constant width in the second direction 570, but the flow forming portion 750 is a region having a minute width forming a boundary layer between the first region 721 and the second region 722.

[0115] The plurality of second nozzles 62 (62A, 62B, 62C, 62D) are arranged in the second region 722. A swirling flow flowing along the periphery of the second region 722 when viewed from above is formed by the plurality of second nozzles 62 (62A, 62B, 62C, 62D). In particular, the second nozzle 62A is provided at a position adjacent to the flow forming portion 750 in the second direction 570. The coolant discharge port 62a of the second nozzle 62A faces the third direction 580.

[0116] In such a configuration, a coolant flow along the third direction 580 intersecting the coolant flow direction (second direction 570) in the first region 721 is formed in the flow forming portion 750 that forms the boundary between the first region 721 and the second region 722. The flow forming portion 750 is between the pumping portion 730 and the inflow portion 740 in the second direction 570 and corresponds to a region where a coolant flow along the third direction 580 by the plurality of second nozzles 62 occurs.

[0117] FIG. 9 is a plan view showing a modified example of the first tank in FIG. 8. Referring to FIG. 9, in this modified example, the length (width) of the second tank portion 720 in the first direction 560 is constant regardless of the position in the second direction 570. The length (width) of the second region 722 in the first direction 560 is the same as the length (width) of the first region 721 in the first direction 560.

[0118] Summarizing the configuration of the first tank 110 in the third embodiment of the present invention described above, the first tank 110 as a coolant tank in the present embodiment has a first tank portion 710 into which the coolant flowing from the processing area 220 flows and which extends in the first direction 560, and a second tank portion 720 into which the coolant flowing in the first tank portion 710 flows and which extends in a second direction 570 intersecting the first direction 560. The second tank portion 720 has a first region 721 where there is a pumping portion 730 for pumping up the coolant, and a second region 722 where there is an inflow portion 740 into which the coolant having been processed for foreign matters contained in the coolant flows. To form a boundary between the first region 721 and the second region 722, the first region 721 is provided with a flow forming portion 750 that forms a coolant flow in a third direction 580 intersecting the second direction 570 with respect to the coolant flowing in the second direction 570.

[0119] According to such a configuration, the dirty coolant flowing from the processing area 220 into the first tank portion 710 is guided to the pumping portion 730 in the second region 722 and pumped up by the pumping portion 730. In this case, to form a boundary between the first region 721 and the second region 722, the flow forming portion 750 that forms a coolant flow in a third direction 580 intersecting the second direction 570 with respect to the coolant flowing in the second direction 570 in the first region 721 can suppress the dirty coolant from entering from the first region 721 into the second region 722. Thereby, it is possible to prevent the dirty coolant from being mixed into the clean coolant in the second region 722 where there is the inflow portion 740 into which the coolant having been processed for foreign matters contained in the coolant flows. As a result, it becomes possible to sufficiently supply clean coolant from the first tank 110.

[0120] The machine tool 200 in the present embodiment includes a machine tool main body 210 that performs machining of a workpiece, and a first tank 110 as a coolant tank, and a coolant processing device 100 for processing the coolant used for workpiece machining in the machine tool main body 210.

[0121] According to such a configuration, it is possible to sufficiently supply clean coolant from the first tank 110 to the machine tool main body 210.

[0122] In addition, in the present embodiment, the second tank 160 may be configured to be placed separately from the first tank 110 without being stacked above the first tank 110.

[0123] (Embodiment 3) FIG. 10 is a plan view and a cross-sectional view showing the inclined structure of the bottom surface and the side surface of the first tank in Embodiment 3 of the present invention. In the present embodiment, the inclined structure of the bottom surface 121 and the side surface 122 of the first tank 110 in Embodiment 1 will be described.

[0124] Referring to FIG. 10, a first tank portion 660, a second tank portion 670, and a corner portion 680 are defined in the tank body 120.

[0125] The first tank portion 660 extends in the first direction 510 in a top view. The first tank portion 660 has an elongated shape in which the first direction 510 is the longitudinal direction and the second direction 520 is the short-side direction (width direction). The maximum length of the first tank portion 660 in the first direction 510 is larger than the maximum length of the first tank portion 660 in the second direction 520.

[0126] The second tank portion 670 extends in the second direction 520 in a top view. The second tank portion 670 has an elongated shape in which the second direction 520 is the longitudinal direction and the first direction 510 is the short-side direction (width direction). The maximum length of the second tank portion 670 in the second direction 520 is larger than the maximum length of the second tank portion 670 in the first direction 510.

[0127] The corner portion 680 connects the end of the first tank portion 660 in the first direction 510 and the end of the second tank portion 670 in the second direction 520. The corner portion 680 is disposed at the corner formed by the first tank portion 660 and the second tank portion 670. The first tank portion 660 extends from the corner portion 680 in the first direction 510. The second tank portion 670 extends from the corner portion 680 in the second direction 520. The corner portion 680 has a rectangular shape in top view.

[0128] The bottom surface 121 has a first inclined portion 611, a second inclined portion 612, and a horizontal portion 613. The first inclined portion 611 is disposed in the first tank portion 660. The first inclined portion 611 is inclined so as to shift downward as it approaches the corner portion 680 in the first direction 510. The first inclined portion 611 is configured in a manner that it is a downhill slope toward the corner portion 680 in the first direction 510.

[0129] The first inclined portion 611 has a distal end 611p and a proximal end 611q. The first inclined portion 611 extends between the distal end 611p and the proximal end 611q in the first direction 510. The distal end 611p is located farthest from the corner portion 680 in the first direction 510. The proximal end 611q is continuous with the later-described horizontal portion 613. The first inclined portion 611 has an inclination (gradient) that is highest at the distal end 611p and lowest at the proximal end 611q. The inclination of the first inclined portion 611 is constant between the distal end 611p and the proximal end 611q. The distance between the first inclined portion 611 and the water surface of the coolant stored in the first storage space 126 on the first inclined portion 611 in the third direction 530 (vertical direction) is minimum at the distal end 611p and maximum at the proximal end 611q.

[0130] The second inclined portion 612 is disposed in the second tank portion 670. The second inclined portion 612 is inclined so as to shift downward as it approaches the corner portion 680 in the second direction 520. The second inclined portion 612 is configured in a manner that it is a downhill slope toward the corner portion 680 in the second direction 520.

[0131] The second inclined portion 612 has a distal end 612p and a proximal end 612q. The second inclined portion 612 extends between the distal end 612p and the proximal end 612q in the second direction 520. The distal end 612p is located farthest from the corner portion 680 in the second direction 520. The proximal end 612q is continuous with the later-described horizontal portion 613. The second inclined portion 612 has an inclination (gradient) that is highest at the distal end 612p and lowest at the proximal end 612q. The inclination of the second inclined portion 612 is constant between the distal end 612p and the proximal end 612q. The distance in the third direction 530 (vertical direction) between the second inclined portion 612 and the water surface of the coolant stored in the first storage space 126 on the second inclined portion 612 is minimum at the distal end 612p and maximum at the proximal end 612q.

[0132] The horizontal portion 613 is disposed at the corner portion 680. The horizontal portion 613 extends in the horizontal direction. The distance in the third direction 530 (vertical direction) between the horizontal portion 613 and the water surface of the coolant stored in the first storage space 126 on the horizontal portion 613 is constant at the horizontal portion 613.

[0133] When the magnitude of the step between the distal end 611p and the proximal end 611q in the third direction 530 per unit length of the first inclined portion 611 in the first direction 510 is referred to as the inclination degree of the first inclined portion 611, the inclination degree (H1 / L1) of the first inclined portion 611 may be in the range of 5 mm / m or more and 50 mm / m or less. Similarly, the inclination degree (H2 / L2) of the second inclined portion 612 may be in the range of 5 mm / m or more and 50 mm / m or less.

[0134] The length L1 of the first inclined portion 611 in the first direction 510 is greater than the length L2 of the second inclined portion 612 in the second direction 520 (L1>L2). In this case, the angle θ1 formed by the first inclined portion 611 with respect to the horizontal direction is smaller than the angle θ2 formed by the second inclined portion 612 with respect to the horizontal direction (θ1<θ2). The magnitude H1 of the step between the distal end 611p and the proximal end 611q in the first inclined portion 611 may be the same as the magnitude H2 of the step between the distal end 612p and the proximal end 612q in the second inclined portion 612 (H1=H2).

[0135] Note that the angle θ1 formed by the first inclined portion 611 with respect to the horizontal direction may be the same as the angle θ2 formed by the second inclined portion 612 with respect to the horizontal direction (θ1 = θ2), or may be larger than the angle θ2 formed by the second inclined portion 612 with respect to the horizontal direction (θ1 > θ2).

[0136] The tank body 121 is further defined with a protruding portion 690. The protruding portion 690 is provided at a position away from the corner portion 680 in the second direction 520. The protruding portion 690 protrudes from the second tank portion 670 in the first direction 510. The first tank portion 660 extends from the corner portion 680 in one direction along the first direction 510. The protruding portion 690 protrudes from the second tank portion 670 in the other direction along the first direction 510.

[0137] The bottom surface 121 further has a third inclined portion 614. The third inclined portion 614 is disposed on the protruding portion 690. The third inclined portion 614 is inclined so as to shift downward as it approaches the corner portion 680 in the second direction 520. The third inclined portion 614 is configured in a manner that forms a downward slope toward the corner portion 680 in the second direction 520.

[0138] The third inclined portion 614 has a distal end 614p and a proximal end 614q. The third inclined portion 614 extends between the distal end 614p and the proximal end 614q in the second direction 520. The distal end 614p is located farthest from the corner portion 680 in the second direction 520. The distal end 614p is disposed at a position aligned with the distal end 612p of the second inclined portion 612 in the second direction 520. The proximal end 614q is located closest to the corner portion 680 in the second direction 520. The proximal end 614q is disposed between the distal end 612p and the proximal end 612q of the second inclined portion 612 in the second direction 520. The proximal end 614q is disposed at a position closer to the proximal end 612q of the second inclined portion 612 than the distal end 612p of the second inclined portion 612 in the second direction 520.

[0139] The third inclined portion 614 has an inclination (gradient) that is highest at the distal end 614p and lowest at the proximal end 614q. The inclination of the third inclined portion 614 is constant between the distal end 612p and the proximal end 612q. The distance in the third direction 530 (vertical direction) between the third inclined portion 614 and the water surface of the coolant stored in the first storage space 126 on the third inclined portion 614 is minimum at the distal end 614p and maximum at the proximal end 614q.

[0140] The third inclined portion 614 has the same degree of inclination as the second inclined portion 612. The height of the distal end 614p is the same as the height of the distal end 612p of the second inclined portion 612. The angle θ3 formed by the third inclined portion 614 with respect to the horizontal direction is the same as the angle θ2 formed by the second inclined portion 612 with respect to the horizontal direction (θ3 = θ2).

[0141] The side surface 122 has a first side surface portion 122i and a second side surface portion 122j. The first side surface portion 122i rises from the third inclined portion 614. The first side surface portion 122i rises from the proximal end 614q. The second side surface portion 122j rises from the second inclined portion 612. The second side surface portion 122j extends in the second direction 520. The second side surface portion 122j is connected to the first side surface portion 122i.

[0142] In a top view, the first side surface portion 122i is inclined so as to approach the corner portion 680 in the second direction 520 as it approaches the second side surface portion 122j in the first direction 510. In a top view, the first side surface portion 122i extends in an oblique direction with respect to the first direction 510. The first side surface portion 122i and the second side surface portion 122j are connected to each other at an angle θ4 greater than 90° (θ4 > 90°).

[0143] In such a configuration, the height of the proximal end 614q along the first side surface portion 122i becomes lower as it approaches the second side surface portion 122j in the first direction 510.

[0144] Summarizing the configuration of the first tank 110 in the third embodiment of the present invention described above, the first tank 110 as a coolant tank in the present embodiment includes a tank body 120 having a bottom surface 121 and forming a first storage space 126 as a space capable of storing coolant on the bottom surface 121. In the tank body 120, a first tank portion 660 extending in the first direction 510, a second tank portion 670 extending in a second direction 520 orthogonal to the first direction 510, an end portion of the first tank portion 660 in the first direction 510, and an end portion of the second tank portion 670 in the second direction 520 are defined. The bottom surface 121 includes a first inclined portion 611 disposed in the first tank portion 660 and inclined so as to shift downward as it approaches the corner portion 680 in the first direction 510, and a second inclined portion 612 disposed in the second tank portion 670 and inclined so as to shift downward as it approaches the corner portion 680 in the second direction 520.

[0145] According to such a configuration, when draining the coolant from the tank body 120, the coolant staying in the first tank portion 660 and the second tank portion 670 can be collected at the corner portion 680 by the inclination of the first inclined portion 611 and the second inclined portion 612, respectively (in FIG. 10, the flow of the coolant when draining the coolant from the tank body 120 is indicated by arrows). Thereby, the operation of draining the coolant from the tank body 120 can be easily performed.

[0146] For example, when assembling the machine tool 200, there may be a case where, in the factory, after attaching the cover body 211 to the machine tool body 210, an operation of draining the coolant from the tank body 120 is performed. Even in such a case, by removing the lid 130J (see FIGS. 1 and 2) disposed directly above the corner portion 680, the coolant collected at the corner portion 680 can be sucked using a pump. As a result, it is not necessary to pull out the first tank 110 from the machine tool body 210 or tilt the first tank 110 to collect the coolant at one place, so that the workability when draining the coolant from the first tank 110 can be significantly improved.

[0147] Further, the bottom surface 121 is disposed at the corner portion 680 and further includes a horizontal portion 613 extending in the horizontal direction. According to such a configuration, by retaining the coolant from the first tank portion 660 and the second tank portion 670 on the horizontal portion 613 in the corner portion 680, the operation of draining the coolant from the tank body 120 can be performed more easily.

[0148] Also, the length L1 of the first inclined portion 611 in the first direction 510 is larger than the length L2 of the second inclined portion 612 in the second direction 520. The angle θ1 formed by the first inclined portion 611 with respect to the horizontal direction is smaller than the angle θ2 formed by the second inclined portion 612 with respect to the horizontal direction.

[0149] According to such a configuration, by suppressing the height of the top portion (distal end 611p) of the first inclined portion 611, the volume of the first tank 110 can be sufficiently ensured.

[0150] In addition, when the angle θ1 formed by the first inclined portion 611 with respect to the horizontal direction is larger than the angle θ2 formed by the second inclined portion 612 with respect to the horizontal direction, even in the first inclined portion 611 where the travel length to the corner portion 680 is relatively large, the coolant can be efficiently collected in the corner portion 680.

[0151] Further, the tank body 120 further includes an overhanging portion 690 that is provided at a position away from the corner portion 680 in the second direction 520 and projects from the second tank portion 670 in the first direction 510. The bottom surface 121 is disposed on the overhanging portion 690, and a third inclined portion 614 is further defined that inclines downward so as to shift closer to the corner portion 680 in the second direction 520. The tank body 120 further has a side surface 122 that rises from the bottom surface 121 and forms a first storage space 126 together with the bottom surface 121. The side surface 122 includes a first side surface portion 122i that rises from the third inclined portion 614, and a second side surface portion 122j that rises from the second inclined portion 612, extends in the second direction 520, and is connected to the first side surface portion 122i. In a top view, the first side surface portion 122i inclines so as to approach the corner portion 680 in the second direction 520 as it approaches the second side surface portion 122j in the first direction 510.

[0152] According to such a configuration, the coolant staying in the overhanging portion 690 moves to the first side surface portion 122i due to the inclination of the third inclined portion 614. In this case, since the first side surface portion 122i inclines so as to approach the corner portion 680 in the second direction 520 as it approaches the second side surface portion 122j in the first direction 510 in a top view, the coolant can be moved toward the second side surface portion 122j while following the first side surface portion 122i. Thereby, the coolant from the overhanging portion 690 can be merged into the coolant flow toward the corner portion 680 in the second tank portion 670.

[0153] Further, in the tank body 120, a coolant flow is formed in which the coolant from the machine tool body 210 flowing into the first tank portion 660 enters the second tank portion 670 through the corner portion 680 and moves from the lower position to the upper position of the second inclined portion 612 in the second tank portion 670.

[0154] According to such a configuration, during normal operation of the machine tool 200, the second inclined portion 612 is in a form that opposes the coolant flow in the tank body 120. On the other hand, when extracting the coolant from the tank body 120, the second inclined portion 612 can smoothly collect the coolant staying in the second tank portion 670 to the corner portion 680.

[0155] The machine tool 200 in the present embodiment includes a machine tool main body 210 that performs machining of a workpiece, and a first tank 110 as a coolant tank, and includes a coolant processing device 100 for processing the coolant used for workpiece machining in the machine tool main body 210.

[0156] According to such a configuration, it is possible to realize a machine tool 200 that can easily perform the operation of extracting the coolant from the tank body 120.

[0157] Note that the second tank 160 has an L shape when viewed from above (see FIGS. 2 and 7). In such a configuration, a slope structure similar to the bottom surface 121 of the first tank 110 may be provided on the bottom surface 171 of the second tank 160. In this case, by removing the lid 180J (see FIG. 2) disposed directly above the corner portion of the second tank 160 and inserting the suction portion of a manual pump or a small electric pump into the second tank 160, the coolant collected in the corner portion of the second tank 160 can be easily extracted.

[0158] The disclosed embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and it is intended that all modifications within the meaning and scope equivalent to the scope of the claims be included.

Explanation of Reference Numerals

[0159] 21 coolant return mechanism, 22 drain pipe, 31 gutter, 41 foreign object capture device, 42 foreign object separation section, 43 foreign object recovery section, 44 coolant outflow section, 45 coolant inflow section, 46 partition wall, 51 first pump, 52 second pump, 53 third pump, 61, 61A, 61B, 61C first nozzle, 61a, 62a coolant discharge port, 62, 62A, 62B, 62C, 62D second nozzle, 63 third nozzle, 100 coolant treatment device, 110 first tank, 111, 241 wheels, 120, 170 tank body, 121, 171 bottom surface, 122, 172 side surface, 122i first side face portion, 122j second side face portion, 122k third side face portion, 126 first storage space, 130, 130J, 180, 180J lid, 131, 173, 212 opening, 160 second tank, 161 notch portion, 176 second storage space, 190 coolant temperature adjustment device, 200 machine tool, 210 machine tool body, 211 cover body, 213 door, 220 machining area, 230 chip conveyor, 231 cover portion, 232 coolant discharge port, 233 chip receiving port, 234 chip discharge port, 236 conveying device, 251 base coolant nozzle, 252 machine body coolant circulation device, 253 cutting edge coolant nozzle, 254 through spindle coolant device, 310 first tank region, 310p corner region, 320 second tank region, 330 third tank region, 360, 370, 380 positions, 410 first pipe, 420 second pipe, 510, 560 first direction, 520, 570 second direction, 530, 580 third direction, 611 first inclined portion, 611p, 612p, 614p distal end, 611q, 612q, 614q proximal end, 612 second inclined portion, 613 horizontal portion, 614 protruding portion, 660, 710 first tank portion, 670, 720 second tank portion, 680 corner portion, 690 protruding portion, 721 first region, 722 second region, 730 pumping portion, 740 inflow portion, 750 flow forming portion, FL floor surface.

Claims

1. A coolant flowing from a machining area flows in a first direction, and a first tank portion extending in the first direction; A second tank portion into which the coolant flowing in the first direction into the first tank portion flows, and which extends in a second direction intersecting the first direction, (i) A first region having a pumping portion that pumps the coolant flowing from the first tank portion in the second direction and directs the coolant toward a foreign matter processing device for processing foreign matter contained in the coolant; (ii) (a) An inflow portion for the coolant pumped by the pumping portion and having been processed for foreign matter by the foreign matter processing device to return to the second tank portion; (b) A flow forming portion that forms a coolant flow in a third direction intersecting the second direction with respect to the coolant flowing in the second direction in the first region to form a boundary with respect to the first region; A second region; And the second tank portion, a coolant tank.

2. A machine tool main body for machining a workpiece; A machine tool comprising the coolant tank according to claim 1.

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