Tool rest of machine tool

Abstract

Provided is a tool holder for a machine tool in which an actuator driven by the force of various fluids such as hydraulic oil, air, and coolant can be attached to a turret without increasing the size of the turret. End portions (23a, 42a) of a plurality of fluid connection passages (23, 42) capable of supplying fluid are opened on each shank attachment surface (11) of the turret (2). The turret (2) and the tool holder body (3) are provided with fluid supply mechanisms (20, 40) for supplying fluid to the fluid connection passages (23, 42). An actuator, which uses the fluid supplied through the fluid connection passages (23, 42) as a drive source, can be attached to the turret (2).

Description

TECHNICAL FIELD

[0001] The present application relates to a tool holder provided in a machine tool, such as an NC lathe. BACKGROUND

[0002] A general tool holder has a rotary indexing turret capable of mounting a plurality of tools including tool shanks, and is a main structural unit of an NC lathe that indexes and moves the required tool in X-axis and Z-axis directions to perform cutting processing of various shapes of workpieces. In addition, a flow path of one path of a nozzle that sprays cutting fluid toward the tip of the tool is provided on each tool shank mounting surface.

[0003] As such a tool holder, there are a turning-dedicated tool holder and a tool holder that accommodates a rotating (milling) tool.

[0004] Recently, there has been a significant increase in the demand for process concentration and automation due to a shortage of human resources, and a multifunctional tool holder that addresses this issue is being sought.

[0005] For example, Patent Literature 1 discloses the following: for a tool holder provided with a turret that selects a tool to be used by rotary indexing of a tool holder on which a plurality of tools are detachably mounted, a workpiece clamping device that can be attached and detached is provided.

[0006] In such a tool holder provided with a workpiece clamping device, not only is the clamping handle simply opened and closed, but a configuration is added that automatically cleans and the like based on air or coolant, thereby promoting the demand for automation.

[0007] In the tool holder disclosed in Patent Literature 1, a path for supplying a fluid such as air or coolant needs to be added in order to perform cleaning and the like.

[0008] As a tool holder that can add a path for supplying a fluid, Patent Literature 2 discloses a structure in which a turret shaft has through holes in the axial direction that communicate with the outer surface of the turret, and cutting fluid or working oil is supplied from the tool holder main body to the turret side through these through holes.

[0009] In the tool holder disclosed in Patent Literature 2, since wiring and piping for supplying air and the like for cleaning the rollers, a hydraulic cylinder that opens and closes the jaws of the workpiece holding device, and a detector that confirms the operation of the jaws are supplied from the front surface side of the turret to the workpiece holding device, there is a problem that the turret becomes large.

[0010] The tool holder disclosed in Patent Literature 2 is a tool holder for turning (cannot install a rotary tool), and since it cannot be applied to a tool holder for coping with a rotary tool, it is used together with a tool holder for coping with a rotary tool that has existed in the past. That is, in a tool holder having a turret capable of installing a rotary tool (a rotary tool holder), since a rotary drive shaft for a rotary tool is disposed near the center of the tool holder mounting surface, it is difficult to increase the path of the fluid to be supplied, and there has been no tool holder for coping with a rotary tool that can increase the path of the fluid to be supplied.

[0011] Prior Art Documents

[0012] Patent Literature

[0013] Patent Literature 1: Japanese Patent Application Publication No. 2017-205832

[0014] Patent Literature 2: Japanese Patent Application Publication No. 2004-25403 SUMMARY

[0015] The present application has an object to provide a tool holder of a machine tool, which can install an actuator driven by pressure of various fluids such as working oil, air, coolant, etc. in a turret without making the turret large.

[0016] The present application has an object to provide a tool holder of a machine tool, which can install an actuator driven by pressure of various fluids such as working oil, air, coolant, etc. in a turret without making the turret large.

[0017] The present application has an object to provide a tool holder of a machine tool, which can install an actuator driven by pressure of various fluids such as working oil, air, coolant, etc. in a turret without making the turret large.

[0018] 1) A tool holder of a machine tool, comprising: a turret provided with a plurality of tool holder mounting surfaces for mounting a plurality of tool holders on an outer periphery and capable of rotating and indexing to a predetermined position; and a tool holder main body rotatably supporting the turret, the tool holder being characterized in that

[0019] On each tool holder mounting surface of the turret, one end of a plurality of fluid connection passages through which a fluid is supplied is opened, and on the turret and the tool holder main body, a fluid supply mechanism for supplying the fluid to each fluid connection passage is provided,

[0020] An actuator using the fluid supplied through each fluid connection passage as a driving source can be installed in the turret.

[0021] Further, as the actuator, a mechanism having various functions that operates by hydraulic pressure, water pressure, or air pressure, such as a rotation mechanism or a linear advancement mechanism that rotates or linearly advances a tool holder or other components, a mechanical hand mechanism, an ATC mechanism, etc. can be installed.

[0022] 2) The tool holder of the machine tool as recited in 1), characterized in that, as the plurality of tool shanks, at least one rotary tool shank is included, and a rotary tool rotary drive shaft is disposed in the vicinity of the center of the tool shank mounting surface for the rotary tool shank,

[0023] The plurality of fluid connection passages are composed of at least one front surface side fluid connection passage and at least one rear surface side fluid connection passage that are opposite each other across the rotary tool rotary drive shaft,

[0024] The fluid supply mechanism is composed of a front side fluid supply mechanism that supplies fluid to the at least one front surface side fluid connection passage from the front surface side of the turret, and a rear side fluid supply mechanism that supplies fluid to the at least one rear surface side fluid connection passage from the rear surface side of the turret.

[0025] 3) The tool holder of the machine tool as recited in 2), characterized in that the rotary shaft of the turret is hollow,

[0026] The front side fluid supply mechanism has a multi-stage fluid distributor that has a required number of fluid distribution passages, is fixed to the tool holder main body in a manner so as to be positioned on the front side of the turret, fluid introduction pipes that are inserted into the rotary shaft and respectively introduce fluid to each of the fluid distribution passages of the multi-stage fluid distributor, and a fluid communication member that forms fluid communication passages having a turret side end portion and a distributor side end portion, and rotates integrally with the turret, wherein the turret side end portion respectively communicates with each of the front surface side fluid connection passages of the turret, and the distributor side end portion respectively communicates with each of the fluid distribution passages of the multi-stage fluid distributor when the turret is stopped at the indexing position.

[0027] 4) The tool holder of the machine tool as recited in 3), characterized in that each of the fluid distribution passages of the multi-stage fluid distributor is disposed at a position that is different in the circumferential direction in the rotary shaft, and a cylinder that is urged by an elastic member is slidably disposed at the distributor side end portion edge of the fluid communication member at a portion of each of the fluid distribution passages of the multi-stage fluid distributor that is opposite the distributor side end portion of the fluid communication member, and when the turret is stopped at the indexing position, the fluid is respectively supplied to each of the front surface side fluid connection passages via each of the fluid introduction pipes, each of the fluid distribution passages of the multi-stage fluid distributor, each of the cylinders, and each of the fluid communication passages of the fluid communication member.

[0028] 5) The tool post of any one of the above 2) to 4), characterized in that the rear-side fluid supply mechanism is provided with: a cylinder-piston mechanism provided in the tool post main body and capable of advancing / retracting a piston; a required number of piston internal passages formed inside the piston with a front end portion on the turret-near side and a rear end portion on the turret-far side; a fluid introduction pipe that introduces fluid to the rear end portions of the piston internal passages, respectively; and a joint that communicates the rear-surface-side fluid connection passages and the piston internal passages, respectively,

[0029] The joint is composed of a turret-side joint fixed to the turret so as to communicate with the end portions of the rear-surface-side fluid connection passages outside the shank mounting surface, respectively, and a piston-side joint fixed to the piston so as to communicate with the front end portions of the piston internal passages, respectively,

[0030] When the turret is stopped at the indexing position, the piston is advanced and the respective piston-side joints and the respective turret-side joints are connected, and when the turret is rotated, the piston is retracted and the connection of the respective piston-side joints and the respective turret-side joints is released.

[0031] Effects of the Invention

[0032] The tool post of the machine tool according to the above 1) is provided with a plurality of fluid connection passages for supplying fluid (working oil, air, coolant, and the like) on each shank mounting surface, and thus a plurality of actuators having various functions using various fluids as a driving source can be mounted, thereby providing a new function. Here, since each fluid connection passage is opened in the radial direction, devices and components constituting the fluid supply mechanism can be arranged using the rear surface side as well as the front surface side of the turret, thereby preventing the tool post from being large-sized.

[0033] The tool post of the machine tool according to the above 2) can increase the paths of supplied fluid by supplying a plurality of fluids from the front surface side and the rear surface side of the turret to the front surface side and the rear surface side of the shank mounting surface of the turret, respectively, thereby obtaining the effect of the above 1) in the tool post provided with a turret capable of mounting a rotary tool (a rotary tool shank) that has not been able to be mounted in the past. Here, although six fluid paths can be formed by only the front-surface-side fluid connection passages and the front-side fluid supply mechanism, for example, three fluid paths can be formed on the front and rear sides by using the rear-surface-side fluid connection passages and the rear-side fluid supply mechanism together, thereby preventing the tool post from being large-sized.

[0034] The tool post of the machine tool according to the above 3) can obtain the front-side fluid supply mechanism that supplies fluid to the front-surface-side fluid connection passages from the front surface side of the turret without making the tool post large-sized.

[0035] The tool holder of the machine tool according to the above 4) can simplify a sealing mechanism between the multi-stage fluid distributor of the fixed side and the fluid communication member that rotates with respect to the multi-stage fluid distributor, and thus can prevent the tool holder from being upsized.

[0036] The tool holder of the machine tool according to the above 5) can obtain a rear-side fluid supply mechanism that supplies fluid to the fluid connection passage from the rear surface side of the turret without upsizing the tool holder. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a vertical sectional view showing one embodiment of the tool holder of the machine tool of the present application.

[0038] Figure 2 is a horizontal sectional view of one embodiment of the tool holder of the machine tool of the present application, and is a sectional view along the line II-II of Figure 1 .

[0039] Figure 3 is a front view of one embodiment of the tool holder of the machine tool of the present application.

[0040] Figure 4 is an enlarged vertical sectional view showing an important part of Figure 1 .

[0041] Figure 5 is an enlarged vertical sectional view showing an important part of Figure 4 .

[0042] EXPLANATION OF REFERENCE NUMERALS

[0043] 1: tool holder

[0044] 2: turret

[0045] 3: tool holder main body

[0046] 4: rotation shaft

[0047] 10A, 10B: tool shank

[0048] 10A: tool shank for rotary tool

[0049] 11: tool shank mounting surface

[0050] 12: rotary drive shaft for rotary tool

[0051] 20: front-side fluid supply mechanism

[0052] 21, 22, 23: front surface side fluid connection passage

[0053] 24: multi-stage fluid distributor

[0054] 24a, 24b, 24c: fluid distribution passage

[0055] 25a, 25b, 25c: fluid introduction pipe

[0056] 26: flange (fluid communication member)

[0057] 261a, 261b, 261c: turret side end portion

[0058] 262a, 262b, 262c: dispenser side end portion

[0059] 26a, 26b, 26c: flange inner passage (fluid communication passage)

[0060] 27a, 27b, 27c: cylinder

[0061] 28a, 28b, 28c: spring (elastic member)

[0062] 40: rear side fluid supply mechanism

[0063] 41, 42, 43: rear surface side fluid connection passage

[0064] 41a, 42a, 43a: end portion opening on tool shank mounting surface

[0065] 41b, 42b, 43b: end portion outside tool shank mounting surface

[0066] 44: cylinder piston mechanism

[0067] 45: piston

[0068] 45a, 45b, 45c: piston inner passage

[0069] 451a, 451b, 451c: front end portion

[0070] 452a, 452b, 452c: rear end portion

[0071] 46a, 46b, 46c: fluid introduction pipe

[0072] 47a, 47b, 47c: coupler (joint)

[0073] 471a, 471b, 471c: turret side coupler (joint)

[0074] 472a, 472b, 472c: piston side coupler (joint) DETAILED DESCRIPTION

[0075] Hereinafter, referring to Figures 1 to 5 , the tool holder of the embodiment of the machine tool of the present application will be described. Note that, in the present specification, as for front and rear, the left of Figure 1 is set as front, and the right is set as rear.Figure 1 The right of the above is set as the rear.

[0076] The tool holder 1 is provided with: a turret 2 provided with a plurality of tool shank mounting surfaces 11 that mount a plurality of tool shanks 10A, 10B on the outer periphery and that are capable of rotating and indexing to a prescribed position; and a tool holder main body 3 that rotatably supports the turret 2.

[0077] The tool holder 1 is a tool holder that deals with rotary (milling) tools, and a rotary tool rotary drive shaft 12 for rotating the rotary tool shank 10A is disposed in the vicinity of the center of the tool shank mounting surface 11.

[0078] A bevel gear shaft 13 having a bevel gear 13a formed on the base end portion is joined to the front end portion of the rotary tool rotary drive shaft 12, and the bevel gear 13a of the bevel gear shaft 13 engages with a bevel gear 4a provided on the front end portion of the rotary shaft 4.

[0079] The tool holder 1 is capable of mounting a multifunctional actuator that uses fluid as a driving source in order to realize process concentration and automation, and therefore, as shown in FIG. 1, one end portion 21a, 22a, 23a, 41a, 42a, 43a of a plurality of fluid connection passages 21, 22, 23, 41, 42, 43 that supply fluid (various fluids such as working oil, air, and coolant) for driving the actuator is opened on each tool shank mounting surface 11 of the turret 2, and a fluid supply mechanism 20, 40 that supplies fluid to each fluid connection passage 21, 22, 23, 41, 42, 43 is provided on the turret 2 and the tool holder main body 3. Figure 2

[0080] In the present embodiment, the plurality of fluid connection passages 21, 22, 23, 41, 42, 43 are composed of a plurality of (three in the present embodiment, but the number is not limited to this) front surface side fluid connection passages 21, 22, 23 (i.e., a front surface side first connection passage 21, a front surface side second connection passage 22, and a front surface side third connection passage 23) that are opposite each other across the rotary tool rotary drive shaft 12, and a plurality of (three in the present embodiment, but the number is not limited to this, and need not be the same as the front surface side) rear surface side fluid connection passages 41, 42, 43 (i.e., a rear surface side first connection passage 41, a rear surface side second connection passage 42, and a rear surface side third connection passage 43) that are opposite each other across the rotary tool rotary drive shaft 12, and in correspondence with this, a front side fluid supply mechanism 20 that supplies fluid to the three front surface side fluid connection passages 21, 22, 23 from the front surface side of the turret 2 and a rear side fluid supply mechanism 40 that supplies fluid to the three rear surface side fluid connection passages 41, 42, 43 from the rear surface side of the turret 2 are provided. Figure 2 Figure 2

[0081] Furthermore, a tool shank mounting hole 11a is provided at the four corners of the tool shank mounting surface 11.

[0082] ​​​As shown in Figure 1 the front side fluid supply mechanism 20 is provided with: a multi-stage fluid distributor 24 fixed to the tool holder main body 3 in a manner so as to be located at the front side of the turret 2; fluid introduction pipes 25a, 25b, 25c that introduce fluid to the multi-stage fluid distributor 24; and flanges (fluid communication members) 26 that rotate integrally with the turret 2 and that communicate each of the front surface side fluid connection passages 21, 22, 23 of the turret 2 with each of the fluid distribution passages 24a, 24b, 24c of the multi-stage fluid distributor 24.

[0083] The multi-stage fluid distributor 24 is provided in three stages corresponding to the number of the front surface side fluid connection passages 21, 22, 23, and has three fluid distribution passages 24a, 24b, 24c (i.e., a smallest diameter distribution passage 24a, an intermediate diameter distribution passage 24b, and a largest diameter distribution passage 24c).

[0084] Note that the fluid distribution passages 24a, 24b, 24c of the multi-stage fluid distributor 24 are each disposed in a circumferential direction so as to be offset, as shown in Figure 3 , but are depicted in Figure 1 and Figure 4 in the same cross-sectional position for convenience, and with respect to the front surface side fluid connection passages 21, 22, 23 of the turret 2, the front surface side 2nd connection passage 22 that communicates with the intermediate diameter distribution passage 24b is shown below in the drawing, and the front surface side 1st connection passage 21 and the front surface side 3rd connection passage 23 that communicate with the smallest diameter distribution passage 24a and the largest diameter distribution passage 24c are shown overlapping on the drawing.

[0085] As the fluid introduction pipes 25a, 25b, 25c, three fluid introduction pipes 25a, 25b, 25c (i.e., a 1st introduction pipe 25a shown in a two-dot chain line located on the inner side, a 2nd introduction pipe 25b shown in a solid line located on the lower side of the front side, and a 3rd introduction pipe 25c shown in a solid line located on the upper side of the front side) are provided, and the rotation shaft 4 of the tool holder 1 is provided as a hollow shaft in order to accommodate the three fluid introduction pipes 25a, 25b, 25c.

[0086] The front end portions of each of the fluid introduction pipes 25a, 25b, 25c communicate with each of the fluid distribution passages 24a, 24b, 24c of the multi-stage fluid distributor 24.

[0087] The rear end portions of each of the fluid introduction pipes 25a, 25b, 25c are connected to fluid introduction hoses 30a, 30b, 30c via a passage block 29 in which communication passages (not shown) are formed.

[0088] The flange 26 is configured to surround the multi-stage fluid distributor 24 from the front and radially inside and out, and is rotatably fixed to the turret 2 relative to the multi-stage fluid distributor 24. Fluid communication paths 26a, 26b, 26c are formed on the flange 26, connecting the fluid connection passages 21, 22, 23 on the front surface side of the turret 2 with the fluid distribution passages 24a, 24b, 24c of the multi-stage fluid distributor 24.

[0089] The fluid connection passages 21, 22, 23, 41, 42, 43 of the turret 2, the fluid distribution passages 24a, 24b, 24c of the multi-stage fluid distributor 24, and the fluid communication passages 26a, 26b, 26c of the flange 26 can be obtained, for example, by providing cut holes from the surface side on each block body part in a manner that forms L-shaped passages.

[0090] like Figure 4 As shown in detail, the fluid communication paths 26a, 26b, and 26c of the flange 26 are composed of a first fluid communication path 26a, a second fluid communication path 26b, and a third fluid communication path 26c. The first fluid communication path 26a has a turret-side end 261a that communicates with the first connection passage 21 on the front surface side of the turret 2, and a distributor-side end 262a that communicates with the minimum diameter distribution passage 24a of the multi-stage fluid distributor 24 when the turret 2 is stopped in the inverted position. The second fluid communication path 26b has a connection passage 26a that communicates with the first connection passage 21 on the front surface side of the turret 2, and a distributor-side end 262a that communicates with the minimum diameter distribution passage 24a of the multi-stage fluid distributor 24 when the turret 2 is stopped in the inverted position. The turret-side end 261b of the turret 2 is connected to the second connecting passage 22 on the front surface side and the distributor-side end 262b is connected to the intermediate diameter distribution passage 24b of the multi-stage fluid distributor 24 when the turret 2 is stopped in the indexed position. The third fluid connection passage 26c has a turret-side end 261c connected to the third connecting passage 23 on the front surface side of the turret 2 and a distributor-side end 262c connected to the maximum diameter distribution passage 24c of the multi-stage fluid distributor 24 when the turret 2 is stopped in the indexed position.

[0091] like Figure 5 As shown, in the portions of the fluid distribution passages 24a, 24b, 24c of the multi-stage fluid distributor 24 opposite to the distributor-side ends 262a, 262b, 262c of the fluid communication component 26, the cylinders 27a, 27b, 27c, which are stressed by springs (elastic components) 28a, 28b, 28c, are slidably disposed on the edges of the distributor-side ends 262a, 262b, 262c of the flange 26. The flange 26, which is integrated with (e.g., fastened) to the turret 2, rotates relative to the multi-stage fluid distributor 24 and slides closely with each cylinder 27a, 27b, 27c. The cylinders 27a, 27b, 27c are always in contact with the flange 26, and at the rotated position, fluid leakage is prevented by the stress exerted by the springs (elastic components) 28a, 28b, 28c.

[0092] Thus, according to the front fluid supply mechanism 20 of the above embodiment, when the turret 2 stops at the indexed position, the fluid supplied from each fluid inlet hose 30a, 30b, 30c (three paths in the illustrated example) is supplied via the passage block 29, each fluid inlet pipe 25a, 25b, 25c, each fluid distribution passage 24a, 24b, 24c of the multi-stage distributor 24, each cylinder 27a, 27b, 27c, and each fluid connection passage 26a, 26b, 26c of the flange 26 to the fluid connection passage (three paths in the illustrated example) 21, 22, 23 provided on the front surface side of the tool holder mounting surface 11 of the turret 2. The fluid communication paths 26a, 26b, and 26c of the flange 26 are provided on each tool holder mounting surface 11 of the turret 2 in accordance with the number of surfaces. By rotating the turret 2, fluid is supplied to the tool holder mounting surface 11 that communicates with one of the cylindrical tubes 27a, 27b, and 27c.

[0093] It should be noted that during machining, fluid is usually supplied to the tool holder mounting surface 11 that is being indexed. However, by changing the phase of the mounting cylinders 27a, 27b, and 27c, fluid is supplied to the actuator mounted on the tool holder mounting surface 11 that is not being indexed during machining. For example, the actuator can be used for handling, cleaning, and machining assistance.

[0094] like Figure 2 As shown, the rear fluid supply mechanism 40 includes: a cylinder piston mechanism 44 disposed on the tool holder body 3 and capable of moving the piston 45 forward / backward; three piston internal passages 45a, 45b, and 45c (the same number as the rear surface side fluid connection passages 41, 42, and 43) formed inside the piston 45 (a first piston internal passage 45a communicating with the rear surface side first connection passage 41, a second piston internal passage 45b communicating with the rear surface side second connection passage 42, and a third piston internal passage 45c communicating with the rear surface side third connection passage 43); fluid inlet pipes 46a, 46b, and 46c for introducing fluid into each piston internal passage 45a, 45b, and 45c respectively; and connectors (joints) 47a, 47b, and 47c for connecting the rear surface side fluid connection passages 41, 42, and 43 with the piston internal passages 45a, 45b, and 45c.

[0095] The piston internal passages 45a, 45b, and 45c have front ends 451a, 451b, and 451c on the side closer to the turret 2, and rear ends 452a, 452b, and 452c on the side farther from the turret 2. Fluid is introduced into the rear ends 452a, 452b, and 452c of the piston internal passages 45a, 45b, and 45c through the fluid inlet pipes 46a, 46b, and 46c, respectively.

[0096] The connectors 47a, 47b, and 47c are composed of turret-side connectors (joints) 471a, 471b, and 471c and piston-side connectors (joints) 472a, 472b, and 472c. The turret-side connectors (joints) 471a, 471b, and 471c are fixed to the back side of the turret 2 in a manner that communicates with the ends 41b, 42b, and 43b of the fluid connection passages 41, 42, and 43 on the rear surface side outside the tool holder mounting surface 11. The piston-side connectors (joints) 472a, 472b, and 472c are fixed to the piston 45 in a manner that communicates with the front ends 451a, 451b, and 451c of the piston internal passages 45a, 45b, and 45c.

[0097] The piston 45 is housed within a cylinder 48 that is fastened to the tool holder body 3, and moves forward / backward by pressure supplied by hydraulic pressure or the like. The tool holder body 3 is provided with a hydraulic hose 49a for advancing the piston 45 and a hydraulic hose 49b for retracting the piston 45.

[0098] According to the rear fluid supply mechanism 40 of the above embodiment, when the turret 2 stops at the rotation position ( Figure 2 (This state is shown) The piston 45 moves forward and the piston-side connectors 472a, 472b, 472c are connected to the turret-side connectors 471a, 471b, 471c. Thus, the fluid supplied by each fluid inlet pipe 46a, 46b, 46c is supplied via the piston internal passages 45a, 45b, 45c, piston-side connectors 472a, 472b, 472c, and turret-side connectors 471a, 471b, 471c to the rear surface fluid connection passages 41, 42, 43 provided on the rear surface side of the tool holder mounting surface 11 of the turret 2.

[0099] Furthermore, as the turret 2 rotates, the piston 45 retracts and the connection between the piston-side connectors 472a, 472b, and 472c and the turret-side connectors 471a, 471b, and 471c is released, thereby enabling the turret 2 to rotate to the next indexing position.

[0100] According to the tool holder 1 of the above-described embodiment, one end portions 21a, 22a, 23a, 41a, 42a, 43a of the plurality of fluid connection passages 21, 22, 23, 41, 42, 43 through which fluid can be supplied open on each tool shank mounting surface 11 of the turret 2, and a fluid supply mechanism 20, 40 that supplies fluid to each fluid connection passage 21, 22, 23, 41, 42, 43 is provided on the tool holder main body 3, so if, for example, a clamp that can be opened and closed by hydraulic pressure or air pressure is mounted to the tool holder 1, the clamp can grip and remove chips wound around a workpiece, and if a robot that can hold a workpiece is mounted to the tool holder 1, automation of workpiece mounting and demounting is facilitated. Furthermore, if a rotation mechanism is added to the robot, front and back surface processing of the workpiece can be continuously performed. In addition, a vibration prevention function that contacts and presses against the workpiece can be added in order to suppress processing vibration of a thin-walled and elongated workpiece or the like. Furthermore, if a clamping function that can mount and demount a tool and operates by hydraulic pressure or air pressure is added, ATC (automatic tool changer) can be performed in cooperation with a robot or the like.

[0101] The ATC function can be obtained, for example, as follows. The functions required on the tool holder 1 side for ordinary tool ATC require hydraulic pressure supply for tool clamping, hydraulic pressure supply for tool unclamping, air blast supply to the tool mounting surface at the time of tool mounting and demounting, drop position confirmation air supply that detects the tool clamping state, through-type cutting fluid supply, and external-type cutting fluid supply. Fluid for these six paths is supplied from the fluid connection passages 21, 22, 23, 41, 42, 43 on the front surface side and the rear surface side of the tool shank mounting surface 11 of the turret 2 to an automatic tool clamping unit, and tool ATC can be performed.

[0102] Furthermore, tool holders generally have two types, one being a turning-dedicated tool holder whose tool shank mounting surface of the turret has only a tool shank mounting hole and a cutting fluid supply hole, and there is relatively ample space for adding the fluid connection passages 21, 22, 23, 41, 42, 43 of the above-described embodiment, and the degree of freedom for implementation is high. The other being the tool holder 1 shown in the above-described embodiment that accommodates a rotary tool, in which, in addition to the tool shank mounting hole and the cutting fluid supply hole, a rotary tool rotary drive shaft 12 is arranged near the center of the tool shank mounting surface 11, so it is difficult to maintain the size of the conventional turret and add a plurality of fluid connection passages 21, 22, 23, 41, 42, 43 in a limited space, and there are constraints such as reducing the number of fluid connection passages or reducing the passage diameter. The tool holder 1 of the above-described embodiment is characterized in that a plurality of fluids are supplied from the front surface side and the rear surface side of the turret to the front surface side and the rear surface side of the tool shank mounting surface 11 of the turret 2, so a plurality of fluid supplies can be performed in a manner that does not change the size of the conventional turret and avoids interference with the rotary tool rotary drive shaft 12.

[0103] Further, in the above-described embodiment, although the fluid is supplied to the shank mounting surface from all six paths, the number of paths can of course be appropriately increased or decreased depending on the space present in the tool holder, and the like.

Claims

1. A tool holder of a machine tool, provided with a turret provided with a plurality of tool shank mounting surfaces for mounting a plurality of tool shanks on an outer periphery and capable of rotating and indexing to a prescribed position, and a tool holder main body that rotatably supports the turret, characterized in that, on each tool shank mounting surface of the turret, one end portions of a plurality of fluid connection passages through which a fluid is supplied are opened, and on the turret and the tool holder main body, a fluid supply mechanism that supplies the fluid to each fluid connection passage is provided, and an actuator that uses the fluid supplied through each fluid connection passage as a drive source is capable of being mounted to the turret.

2. The tool holder of a machine tool according to claim 1, characterized in that, as the plurality of tool shanks, at least one rotary tool shank is included, a rotary tool shank rotary drive shaft is disposed in the vicinity of the center of the tool shank mounting surface for the rotary tool shank, the plurality of fluid connection passages are composed of at least one front surface side fluid connection passage and at least one rear surface side fluid connection passage that are opposed across the rotary tool shank rotary drive shaft, and the fluid supply mechanism is composed of a front side fluid supply mechanism that supplies the fluid to the at least one front surface side fluid connection passage from the front surface side of the turret, and a rear side fluid supply mechanism that supplies the fluid to the at least one rear surface side fluid connection passage from the rear surface side of the turret.

3. The tool holder of a machine tool according to claim 2, characterized in that, a rotary shaft of the turret is hollow, the front side fluid supply mechanism is provided with a multi-stage fluid distributor that has a required number of fluid distribution passages and is fixed to the tool holder main body in a manner so as to be positioned on the front side of the turret, a fluid introduction pipe that is inserted into the rotary shaft and introduces the fluid to each fluid distribution passage of the multi-stage fluid distributor, and a fluid communication member that forms a fluid communication passage having a turret side end portion and a distributor side end portion and rotates integrally with the turret, wherein the turret side end portion communicates with each front surface side fluid connection passage of the turret, and the distributor side end portion communicates with each fluid distribution passage of the multi-stage fluid distributor when the turret is stopped at an indexing position.

4. The tool holder of a machine tool according to claim 3, characterized in that, each fluid distribution passage of the multi-stage fluid distributor is disposed at a position different in a circumferential direction in the rotary shaft, and a cylinder that is urged by an elastic member is slidably disposed at a distributor side end portion edge of the fluid communication member at a portion of each fluid distribution passage of the multi-stage fluid distributor that is opposed to the distributor side end portion of the fluid communication member, and the fluid is supplied to each front surface side fluid connection passage via each fluid introduction pipe, each fluid distribution passage of the multi-stage fluid distributor, each cylinder, and each fluid communication passage of the fluid communication member when the turret is stopped at the indexing position.

5. The tool holder of a machine tool according to any one of claims 2 to 4, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ ​ The rear-side fluid supply mechanism includes a cylinder-piston mechanism provided to the tool holder main body and capable of advancing / retracting a piston, a required number of piston internal passages formed inside the piston with a front end portion on a side closer to the turret and a rear end portion on a side farther from the turret, a fluid introduction pipe that introduces fluid to the rear end portions of the piston internal passages, respectively, and a joint that communicates the rear-surface-side fluid connection passages and the piston internal passages, respectively, The joint is composed of a turret-side joint fixed to the turret so as to communicate with the end portions of the rear-surface-side fluid connection passages outside the shank mounting surface, respectively, and a piston-side joint fixed to the piston so as to communicate with the front end portions of the piston internal passages, respectively, When the turret is stopped at an indexing position, the piston is advanced and each piston-side joint and each turret-side joint are connected, and when the turret is rotated, the piston is retracted and the connection of each piston-side joint and each turret-side joint is released.

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