Working machinery

Abstract

To provide a machine tool which can reduce reservoir of impurity in a cutting fluid tank of a machine tool body.SOLUTION: An NC lathe includes: a lathe body 4; a main shaft section which is provided on one side of the lathe body 4; a tool holding section which is provided on the other side of the lathe body 4; a cutting fluid supply pump 50 for supplying cutting fluid; a cutting fluid recovery and storage structure which recovers cutting fluid supplied to the lathe machine body 4. The cutting fluid recovery and storage structure has a cutting fluid tank 42 provided at a bottom of the lathe body 4. A cutting fluid supply pump 50 is arranged on one end side of the cutting fluid tank 42 and a cutting fluid feed pump 54 is arranged on the other end side of the cutting fluid tank 42. A part of the cutting fluid recovered in the cutting fluid tank 42 flows into the cutting fluid feed pump 50, a remainder of the cutting fluid flows into the cutting fluid feed pump 54, and cutting fluid in the cutting fluid tank 42 fluently flows into the cutting fluid supply pump 50 or the cutting fluid feed pump 54.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a machine tool equipped with a cutting fluid recovery reservoir structure for recovering and storing cutting fluid. [Background technology]

[0002] NC lathes are one example of machine tools that are widely used for machining workpieces (see, for example, Patent Document 1). These NC lathes include a lathe body, a spindle unit provided on one side of the lathe body, and a tool holder unit provided on the other side. A spindle is rotatably supported by the spindle unit, and a spindle chuck that holds a workpiece is attached to the spindle. A machining tool such as a cutting tool is attached to the tool holder, and the machining tool acts on the workpiece held by the spindle chuck to machine the workpiece.

[0003] In such NC lathes, cutting fluid is used to reduce the heat generated during machining of the workpiece. This cutting fluid is supplied to a jet nozzle by the action of a cutting fluid supply pump, and is then sprayed from this nozzle onto the workpiece being machined and the tip of the machining tool (cutting edge).

[0004] The lathe body is provided with a cutting fluid recovery reservoir structure for recovering the cutting fluid sprayed from the spray nozzle. A conventional cutting fluid recovery mechanism has a configuration, for example, as shown in FIG. 6. In FIG. 6, in this conventional example, two drainage ports 104 and 106 are provided on a lathe body 102. Cutting fluid supplied to the machining area of ​​the lathe body 102 flows down to a cutting fluid tank 108, for example, mainly through the first drainage port 104, while cutting fluid splashed on the lathe body 102 flows down to the cutting fluid tank 108 mainly through the second drainage port 106. The cutting fluid that flows down to the cutting fluid tank 108 flows toward a cutting fluid supply pump 110 and is supplied from the cutting fluid supply pump 110 to a spray nozzle (not shown) in the machining area of ​​the lathe body. This circulation of the cutting fluid cools the lathe body 102, thereby suppressing its temperature rise. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-330414 Summary of the Invention [Problem to be solved by the invention]

[0006] Such conventional NC lathes have the following problem to be solved. Explaining with reference to Figure 6, cutting fluid from first drain port 104 flows toward cutting fluid supply pump 110 as shown by arrow 112 and is collected, and cutting fluid from second drain port 106 flows toward cutting fluid supply pump 110 as shown by arrow 114 and is supplied again from this cutting fluid supply pump 110. However, because there is a space 116 on the way from second drain port 106 to cutting fluid supply pump 110, a portion of the flow of cutting fluid toward cutting fluid supply pump 110 slows down and stagnates in this space 116, which may cause impurities contained in the cutting fluid (e.g., small chips, dust, etc.) to settle and accumulate. When these impurities accumulate in the cutting fluid tank 108 (particularly in the space 116), they need to be removed. However, in order to remove the accumulated impurities, some components of the lathe body 102 must be removed to expose the top surface of the cutting fluid tank 108, which creates a problem in that the removal process is cumbersome.

[0007] An object of the present invention is to provide a machine tool that can reduce the accumulation of impurities in the cutting fluid tank of the machine tool body. [Means for solving the problem]

[0008] The machine tool according to claim 1 of the present invention comprises a machine tool body, a spindle unit provided on one side of the machine tool body, and a tool holder provided on the other side of the machine tool body opposite to the spindle unit; For workpieces in the machining area a cutting fluid supply pump for supplying cutting fluid; a cutting fluid supply pump for supplying cutting fluid to a cooling portion of the machine tool body; and and a cutting fluid recovery reservoir structure for recovering the cutting fluid supplied to the cutting fluid recovery reservoir structure, The cutting fluid recovery reservoir structure has a cutting fluid tank provided at the bottom of the machine tool body, and a cutting fluid recovery space for guiding the cutting fluid supplied to the machine tool body to the cutting fluid tank, and one end side of the cutting fluid tank the side on which the tool holding portion is disposed The cutting fluid supply pump is disposed at the other end of the cutting fluid tank. The side on which the main shaft portion is disposed to The aforementioned A cutting fluid supply pump is installed. And, A part of the cutting fluid collected in the cutting fluid tank flows to the cutting fluid supply pump, Therefore the machine tool body The workpiece in the processing area The remainder of the cutting fluid flows to the cutting fluid feed pump, By the machine tool body is delivered to the cooling area It is characterized by:

[0009] A machine tool according to claim 2 of the present invention comprises a machine tool body, a spindle unit provided on one side of the machine tool body, and a tool holder provided on the other side of the machine tool body opposite to the spindle unit; For the workpiece in the machining area and the cooling area of ​​the machine tool body a cutting fluid supply pump for supplying cutting fluid; a cutting fluid recovery pump for supplying the cutting fluid to a cutting fluid recovery tank for removing oil components in the cutting fluid; The aforementioned Machine tool body and a cutting fluid recovery reservoir structure for recovering the cutting fluid supplied to the cutting fluid recovery reservoir structure, The cutting fluid recovery reservoir structure has a cutting fluid tank provided at the bottom of the machine tool body, and a cutting fluid recovery space for guiding the cutting fluid supplied to the machine tool body to the cutting fluid tank, and one end side of the cutting fluid tank the side on which the tool holding portion is disposed The cutting fluid supply pump is disposed at the other end of the cutting fluid tank. The side on which the main shaft portion is disposed A cutting fluid recovery pump is installed in And, A part of the cutting fluid collected in the cutting fluid tank flows to the cutting fluid supply pump, The workpiece in the machining area and the cooling portion of the machine tool body are cooled by The remaining part of the cutting fluid flows to the cutting fluid recovery pump, and the cutting fluid recovery pump recovers the cutting fluid. It is delivered to the cutting fluid recovery tank It is characterized by:

[0010] In addition, in the machine tool according to claim 3 of the present invention, An auxiliary reservoir tank is attached to the bottom of the machine tool body, protruding into a space below the spindle, and the auxiliary reservoir tank constitutes a part of the cutting fluid tank, and the cutting fluid feed pump is provided in the auxiliary reservoir tank. It is characterized by:

[0011] Furthermore, in the machine tool according to claim 4 of the present invention, an auxiliary reservoir tank is attached to the bottom of the machine tool body so as to protrude into a space below the spindle portion, and the auxiliary reservoir tank constitutes a part of the cutting fluid tank, and the auxiliary reservoir tank to the above A cutting fluid recovery pump is provided. [Effects of the Invention]

[0012] According to the machine tool of the present invention, one end side of the cutting fluid tank of the machine tool body (on the side where the tool holder is located) A supply pump is provided, and the other end (The side where the main shaft is located) Since a cutting fluid supply pump is provided in the cutting fluid recovery space, part of the cutting fluid that flows down to the cutting fluid tank is cutting fluid tank The coolant flows toward the coolant supply pump at one end of the This cutting fluid Machine tool body by supply pump Workpiece in the machining area supplied to cutting fluid tank The remaining cutting fluid that has flowed down is transported to the machine tool body by the cutting fluid feed pump. Cooling area Because it will be sent to cutting fluid tank The cutting fluid that flows down into the tank can be circulated through the machine tool body without stagnating, and as a result, the accumulation of impurities in the cutting fluid tank can be prevented.

[0013] According to the machine tool of the present invention, one end side of the cutting fluid tank of the machine tool body is (on the side where the tool holder is located) A supply pump is provided, and the other end (The side where the main shaft is located) Cutting fluid Recovery pump Since a part of the cutting fluid that flows down into the cutting fluid tank through the cutting fluid recovery space is cutting fluid tank The coolant flows toward the coolant supply pump at one end of the This cutting fluid By supply pump Workpieces in the machining area of ​​the machine tool body and their cooling areas supplied to cutting fluid tank The remaining part of the cutting fluid that flows down to the cutting fluid Recovery pump By Cutting fluid recovery tank After being fed to the cutting fluid tank be returned So, cutting fluid tankThe cutting fluid that flows down into the tank can be circulated without stagnating, and as a result, even with this configuration, it is possible to prevent impurities from accumulating in the cutting fluid tank.

[0015] Furthermore, Claims of the invention 3 and 4 According to the machine tool described in the above, an auxiliary reservoir tank is attached to the bottom of the machine tool body, protruding into the space below the main spindle, and this auxiliary reservoir tank forms part of the cutting fluid tank, so that the space below the main spindle can be effectively used as a location for installing the auxiliary reservoir tank. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a plan view showing a simplified embodiment of an NC lathe as an example of a machine tool according to the present invention; [Figure 2] FIG. 2 is a simplified cross-sectional view showing a portion of the NC lathe shown in FIG. 1. [Figure 3] FIG. 3 is a simplified cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a simplified cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 10 is a simplified cross-sectional view showing a modified form of the cutting fluid tank of the lathe body. [Figure 6] FIG. 5 is a cross-sectional view corresponding to FIG. 4, showing a simplified conventional lathe body. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, with reference to the accompanying drawings, an embodiment of an NC lathe will be described as an example of a machine tool according to the present invention. In Figures 1 and 2, the illustrated NC lathe 2 has a lathe body 4 as a machine tool body that is installed, for example, on the floor of a factory, and a spindle section 6 is provided on one side of this lathe body 4 (left side in Figures 1 and 2), and a tool attachment section 8 is provided on the other side (right side in Figures 1 and 2).

[0018] The spindle unit 6 includes a spindle housing 10, within which a spindle (not shown) is rotatably supported. A spindle chuck means 12 is attached to the spindle so as to rotate integrally therewith, and a workpiece (not shown) to be machined is removably held by the spindle chuck means 12. The spindle unit 6 is provided with an opening / closing cylinder mechanism (shown) for opening and closing the spindle chuck means 12, and in this embodiment, a cover housing 15 of the opening / closing cylinder mechanism protrudes outward (to the left in FIGS. 1 and 2) from the lathe body 4. The spindle unit 6 is provided with a spindle motor 14 (see FIG. 3), and the driving force from the spindle motor 14 is transmitted to the spindle (not shown) via a driving force transmission means such as a drive belt (not shown). Therefore, when the spindle motor 14 is rotated in a predetermined direction, the rotational force is transmitted to the spindle via the driving force transmission means (not shown), and the spindle chuck means 12 (and the workpiece held therein) rotates in the predetermined direction integrally with the spindle.

[0019] The tool holder 8 is composed of a turret device 16 disposed opposite the spindle unit 6, and this turret device 16 is supported so as to be movable in the lateral direction of the lathe body 4 (the Z-axis direction parallel to the axis of the spindle, that is, the left-right direction in FIGS. 1 and 2). That is, the lathe body 4 is provided with a first slide mechanism 18, and this first slide mechanism 18 has a pair of first support rails 20 extending in the lateral direction, and the pair of first support rails 20 is attached to the lathe body 4. The first slide mechanism 18 further has a first movable table 22, and this first movable table 22 is supported by the pair of first support rails 20 so as to be movable in the Z-axis direction.

[0020] The first slide mechanism 18 further includes a first drive motor 24 and a ball screw mechanism (not shown) rotated thereby, and although not shown, a ball screw shaft of the ball screw mechanism is rotatably supported by the lathe body 4, and a block-shaped member that screws onto the ball screw shaft is attached to the first moving table. With this configuration, when the first drive motor 24 rotates in a predetermined direction (or the direction opposite to the predetermined direction), the first moving table 22 is moved in the direction indicated by arrow 26 (or 28) via the ball screw mechanism.

[0021] Although not shown, a second slide mechanism is provided on the first moving table 22. This second slide mechanism has the same configuration as the above-described first slide mechanism, and includes a pair of second support rails extending in the front-to-rear direction, and the pair of second support rails is attached to the first moving table 22. The second slide mechanism further includes a second moving table, which is supported by the pair of second support rails so as to be movable in the X-axis direction.

[0022] This second slide mechanism further includes a second drive motor and a ball screw mechanism (not shown) rotated thereby, and although not shown, the ball screw shaft of this ball screw structure is rotatably supported on the first moving table, a block-shaped member that screws onto this ball screw shaft is attached to the second moving table, and turret device 16 is attached to this second moving table. Because of this configuration, when the second drive motor is rotated in a predetermined direction (or the direction opposite to the predetermined direction), the second moving table (turret device 16) is moved in the direction indicated by arrow 30 (or 32) via the ball screw mechanism.

[0023] The turret device 16 is equipped with a turret 34 having tool mounting portions arranged at intervals around the periphery, and by positioning this turret 34 at a predetermined angular position, a machining tool (not shown) attached to it can be selected, and a workpiece (not shown) held by the spindle chuck means 12 can be subjected to, for example, cutting processing in a machining area 36 using the selected machining tool (e.g., a cutting tool).

[0024] In this NC lathe 2, cutting fluid is supplied when a workpiece is machined in the machining area 36, ​​and the supplied cutting fluid is collected. Referring mainly to FIGS. 2 to 4, thisIn this embodiment, a cutting fluid tank 42 for storing cutting fluid is provided at the bottom of the lathe body 4, and this cutting fluid tank 42 occupies most of the bottom of the lathe body 4. An auxiliary reservoir tank 44 is provided on one side (the spindle unit 6 side) of the lathe body 4, and this auxiliary reservoir tank 44 is connected to the cutting fluid tank 42 and forms part of this cutting fluid tank 42. Partition walls 46, 48 are provided on the bottom surface of this cutting fluid tank 42, and these partition walls 46, 48 can be provided at appropriate locations within the cutting fluid tank 42.

[0025] In this NC lathe 2, a cutting fluid supply pump 50 is disposed in the cutting fluid tank 42 at the end of the tank 42 that faces the tool mounting unit 8 (specifically, at the rear right end of the lathe body 4), and a cutting fluid delivery pump 54 is disposed at the end of the tank 42 that faces the spindle unit 6 (specifically, at the outer front end of the auxiliary reservoir tank 44). Although not shown, cutting fluid from the cutting fluid supply pump 50 is supplied to, for example, a spray nozzle disposed in the machining zone 36 and sprayed from this nozzle toward the workpiece being machined. By supplying cutting fluid in this manner, it is possible to suppress a rise in the temperature of the workpiece during machining. In addition, the cutting fluid from the cutting fluid delivery pump 54 is circulated, for example, through parts of the lathe body 4 that need to be cooled and then returned to the cutting fluid tank 44. By circulating the cutting fluid in this manner, it is possible to suppress a rise in the temperature of the lathe body 4.

[0026] In the NC lathe 2 of this embodiment, a first drain port 56 is provided below the machining area 36 of the lathe body 4, and a second drain port 58 is provided below the rear center of the lathe body. Also, a cutting fluid recovery space 60 (see FIG. 3) is provided for recovering cutting fluid ejected from an ejection nozzle (not shown), and the first and second drain ports 56 are provided at the bottom of this cutting fluid recovery space 60. This cutting fluid recovery space 60, together with the cutting fluid tank 42, constitutes a cutting fluid recovery and reservoir structure.

[0027] A rectangularly enclosed inclined recovery wall 62 is provided below the machining zone 36, and cutting fluid sprayed toward the workpiece in the machining zone 36 is recovered along this inclined recovery wall 62 into the cutting fluid recovery space 60. Furthermore, cutting fluid that has scattered around flows along an inclined wall (not shown) and is recovered into the cutting fluid recovery space 60. The cutting fluid recovered in the cutting fluid recovery space 60 then flows into the cutting fluid tank 42 through the first and second drainage ports 56, 58, and in this way, the cutting fluid supplied to the lathe body 4 is returned to the cutting fluid tank 42 through the cutting fluid recovery space 60 and the first and second drainage ports 56, 58.

[0028] The cutting fluid tank 42 contains cutting fluid and functions as a reservoir. When the cutting fluid supply pump 50 is operated, the cutting fluid in the cutting fluid tank 42 is supplied to, for example, the machining zone 36 of the lathe body 4. During this supply, the cutting fluid returned through the first and second drainage ports 56, 58 flows as shown by the solid arrow 72 due to the partition walls 46, 48 provided in the cutting fluid tank 42. When the cutting fluid feed pump 54 is operated, the cutting fluid in the cutting fluid tank 42 is supplied to, for example, the cooling portion of the lathe body 4. During this supply, the cutting fluid returned through the first and second drainage ports 56, 58 flows as shown by the dashed arrow 74.

[0029] In this way, the cutting fluid in the cutting fluid tank 42, mainly on the tool holder 8 side, flows to the cutting fluid supply pump 50 and is supplied to, for example, the machining zone 36 and recovered, and the cutting fluid in the cutting fluid tank 42, mainly on the spindle 8 side, flows to the cutting fluid feed pump 54 and is supplied to, for example, a cooling portion of the lathe body 4 and recovered. Therefore, as can be seen from Figure 4, the cutting fluid in the cutting fluid tank 42 flows to the cutting fluid supply pump 50 side and is circulated, or flows to the cutting fluid feed pump 54 side and is circulated, which prevents the cutting fluid from stagnating in the cutting fluid tank 42 and prevents impurities from precipitating and accumulating in the cutting fluid tank 42.

[0030] 1, 2, and 4, the auxiliary reservoir tank 44 is disposed in the space below the spindle unit 10 (in this embodiment, the cover housing 15 of the open / close cylinder mechanism), and this wasted space below can be effectively utilized as an installation location for the auxiliary reservoir tank 44. Furthermore, by disposing the auxiliary reservoir tank 44 in such a location and providing a cutting fluid feed pump 54 in this auxiliary reservoir tank 44, a portion of the cutting fluid in the cutting fluid tank 42 flows and is supplied to the cutting fluid supply pump 50 on the tool holder 8 side, and the remainder of the cutting fluid flows and is supplied to the cutting fluid feed pump 54 on the spindle unit 6 side, thereby allowing the cutting fluid in the cutting fluid tank 42 to circulate smoothly throughout the lathe body 4.

[0031] An NC lathe as a machine tool may be configured as shown in Fig. 5. In this modified embodiment, a cutting fluid recovery pump 82 is provided in place of the cutting fluid supply pump. Also, partition walls 84, 86, and 88 are provided on the bottom surface of cutting fluid tank 42A of lathe main body 4A, and such partition walls can be provided in appropriate locations.

[0032] Furthermore, in relation to this cutting fluid recovery pump 82, although not shown, a cutting fluid recovery tank is provided, and an oil component recovery tank for recovering, for example, oil components in the cutting fluid is also provided. In such an NC lathe, when the cutting fluid supply pump 50 is operated, the cutting fluid in the cutting fluid tank 42A is supplied to, for example, the machining area 36 of the lathe body 4, and is also supplied to the cooling area of ​​the lathe body 4A. During this supply, the cutting fluid returned through the first and second drain ports 56, 58 is returned to the cutting fluid tank 42A. 42A The partition walls 84 and 86 are provided inside the tank, so that the fluid flows as shown by the solid arrow 92. When the cutting fluid recovery pump 82 is activated, the cutting fluid tank 42A The cutting fluid in the drain port 56 is supplied to a cutting fluid recovery tank (not shown), and during this supply, the cutting fluid returned through the first and second drain ports 56, 58 flows as shown by the dashed arrow 94 due to the presence of the partition walls 86 and 88.

[0033] When this cutting fluid is fed to a cutting fluid recovery tank (not shown), the oil component is removed, for example, by removing the supernatant in the cutting fluid recovery tank, and the cutting fluid from which the oil component has been removed is cutting fluid tank The oil component that is returned to 42A and removed is recovered in an oil component recovery tank (not shown).

[0034] In this variant, the cutting fluid reservoir 42A The cutting fluid mainly on the tool holder 8 side flows to the cutting fluid supply pump 50 and is supplied to, for example, the lathe body 4A (including the machining area) and collected. 42A The cutting fluid mainly on the spindle 8 side flows to the cutting fluid recovery pump 82 and then to a cutting fluid recovery tank (not shown) where oil components are removed and then returned to the cutting fluid tank 42A. Therefore, even with this configuration, stagnation of the cutting fluid in the cutting fluid tank 42A can be avoided, and the settling and accumulation of impurities in the cutting fluid tank 42 can be suppressed.

[0035] The above describes one embodiment of an NC lathe as an example of a machine tool according to the present invention, but the present invention is not limited to this embodiment, and various modifications and alterations are possible without departing from the scope of the present invention.

[0036] For example, in the above-described embodiment, the lathe is applied to a configuration in which the spindle unit 6 is attached to the lathe body 4 and the turret device 16 moves in the Z-axis direction and the X-axis direction relative to the spindle unit 6. However, the present invention is not limited to this configuration and can be similarly applied to a configuration in which the spindle unit 6 moves in the Z-axis direction and the turret device 16 moves in the X-axis direction, for example.

[0037] Furthermore, for example, in the above-described embodiment, the invention is described as being applied to a device using a turret device 16 as the tool holding portion 8, but is not limited to this, and can be similarly applied to a device using a comb-tooth type tool mounting member as the tool mounting portion 8. [Explanation of symbols]

[0038] 2 NC lathes 4,4A,102 Lathe body 6 Main shaft part 8 Tool mounting part 12 Spindle chuck means 16 Turret device 36 Processing area 42,42A,108 Cutting fluid tank 50,110 Cutting fluid supply pump 54 Cutting fluid supply pump 56,104 First drain outlet 58,106 Second drain port 60 Cutting fluid recovery space 82 Cutting fluid recovery pump

Claims

1. A machine tool comprising: a machine tool body; a spindle unit provided on one side of the machine tool body; a tool holder provided on the other side of the machine tool body opposite the spindle unit; a cutting fluid supply pump for supplying cutting fluid to a workpiece in a machining area; a cutting fluid delivery pump for delivering cutting fluid to a cooling portion of the machine tool body; and a cutting fluid recovery reservoir structure for recovering cutting fluid supplied to the machine tool body, The cutting fluid recovery reservoir structure has a cutting fluid tank provided at the bottom of the machine tool body, and a cutting fluid recovery space for guiding the cutting fluid supplied to the machine tool body to the cutting fluid tank, the cutting fluid supply pump is disposed at one end of the cutting fluid tank on the side where the tool holding portion is disposed, and the cutting fluid delivery pump is disposed at the other end of the cutting fluid tank on the side where the spindle portion is disposed, A machine tool characterized in that a portion of the cutting fluid recovered in the cutting fluid tank flows to the cutting fluid supply pump and is supplied to the workpiece in the machining area of ​​the machine tool body by the cutting fluid supply pump, and the remainder of the cutting fluid flows to the cutting fluid delivery pump and is delivered to the cooling portion of the machine tool body by the cutting fluid delivery pump.

2. A machine tool comprising: a machine tool body; a spindle unit provided on one side of the machine tool body; a tool holder provided on the other side of the machine tool body opposite the spindle unit; a cutting fluid supply pump for supplying cutting fluid to a workpiece in a machining area and to a cooling portion of the machine tool body; a cutting fluid recovery pump for feeding cutting fluid to a cutting fluid recovery tank that removes oil components in the cutting fluid; and a cutting fluid recovery reservoir structure for recovering cutting fluid supplied to the machine tool body, The cutting fluid recovery reservoir structure has a cutting fluid tank provided at the bottom of the machine tool body, and a cutting fluid recovery space for guiding the cutting fluid supplied to the machine tool body to the cutting fluid tank, the cutting fluid supply pump is disposed at one end of the cutting fluid tank on the side where the tool holding portion is disposed, and the cutting fluid recovery pump is disposed at the other end of the cutting fluid tank on the side where the spindle portion is disposed, A machine tool characterized in that a portion of the cutting fluid recovered in the cutting fluid tank flows to the cutting fluid supply pump, which supplies it to the workpiece in the machining area and the cooling portion of the machine tool body, and the remainder of the cutting fluid flows to the cutting fluid recovery pump, which supplies it to the cutting fluid recovery tank.

3. A machine tool as described in Claim 1, characterized in that an auxiliary reservoir tank is attached to the bottom of the machine tool body and protrudes into the space below the main spindle portion, the auxiliary reservoir tank forms part of the cutting fluid tank, and the cutting fluid supply pump is provided in the auxiliary reservoir tank.

4. 3. The machine tool according to claim 2, wherein an auxiliary reservoir tank is attached to the bottom of the machine tool body and protrudes into a space below the main spindle, the auxiliary reservoir tank forming part of the cutting fluid tank, and the cutting fluid recovery pump is provided in the auxiliary reservoir tank.

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