Tool holding fixture and tool holding device

Abstract

[Problem] To disclose a configuration that allows the tool protrusion length to be changed while maintaining the characteristics of coolant supply to a tool. [Solution] A tool 700 which is inserted into a body inner space (400a, 240a) of a body (400, 240) constituting a tool holding fixture 300 has a tool passage 740 and at least one cutout portion 730. The tool passage 740 has an opening 740b in a tool rear end surface 710B. The cutout portion 730 is formed by a cutout surface 731 on a tool outer peripheral surface 712, and has an opening 730b in the region of the tool rear end surface 710B closer to the tool centerline than the opening 740b. A movable member 500 is moved toward the leading end by coolant supplied from an inflow port 450a to the body inner space. At this time, with a through hole 540 of the movable member 500 facing the tool passage 740 of the tool 700, a movable member leading end surface portion 530A abuts on the region of the tool rear end surface 710B around the opening 740b.

Description

[Technical field]

[0001] The present application discloses a technique for changing the tool projection length while maintaining the characteristics of supplying coolant to the tool in a tool holder and a tool holding device that hold a tool. [Background technology]

[0002] Machine tools for machining metal workpieces use tool holders that hold tools. The tool holders are supported by a support device. When machining a workpiece with a tool, it is necessary to spray a coolant such as oil (sometimes called a "cooling medium") onto the cutting edge of the tool to lubricate the workpiece and tool, cool the workpiece and tool, and remove (clean) chips (sometimes called "swarf") generated during machining. For this reason, tool holders are used that are equipped with a coolant supply mechanism that supplies the coolant. The coolant is supplied from the support device to the tool holder. tool holder are supplied to. A tool holder equipped with a coolant supply mechanism is disclosed, for example, in Patent Document 1 (JP Patent Publication 2001-287135 A). The tool holder disclosed in Patent Document 1 uses a tool having a tool passage that opens on the rear end face of the tool. The tool holder includes a body member having a space inside the body member into which the tool is inserted, and a wall surface on which a coolant supply port is formed is provided on the rear end side of the space inside the body member. The tool is inserted into the space inside the body member until the rear end face of the tool abuts against the wall surface on which the coolant supply port is formed. As a result, coolant supplied from the coolant supply port is sprayed onto the cutting edge of the tool through the tool passage. The tool holder has a tool holding mechanism that holds a tool inserted into the space inside the main body member. The tool holder disclosed in Patent Document 1 has a tool holding mechanism that is configured with a collet that holds the outer peripheral surface of the tool of the tool main body member. Furthermore, Patent Document 2 discloses a tool holder having a tool holding mechanism different from the tool holding mechanism disclosed in Patent Document 1. The tool holding mechanism disclosed in Patent Document 2 is composed of a notch and a rotation-stop member formed in a tool body member. The notch is Tool body member outer surface The anti-rotation member is movably disposed within a radially extending hole formed in the body member of the tool holder. Inside the space inside the main body With the tool inserted into the tool holder, the anti-rotation member is moved radially inward from the inner circumferential surface of the main body member so as to abut against the notched surface of the tool. The anti-rotation member presses against the notched surface of the tool, thereby holding the tool in a state in which rotation is restricted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-287135 A [Patent Document 2] JP 2001-87969 A Summary of the Invention [Problem to be solved by the invention]

[0004] The tool disclosed in Patent Document 1 may be provided with the notch disclosed in Patent Document 2. That is, a tool having a tool passage opening on the rear end face of the tool and a notch opening on the rear end face of the tool may be used. Here, the rear end face of the tool is formation When machining is performed with the cutting tool in contact with the wall surface, the coolant supplied from the coolant supply port does not flow into the cutout portion. However, when machining is performed without the rear end face of the tool abutting against the wall surface on which the coolant supply port is formed, a space is generated between the wall surface on which the coolant supply port is formed and the rear end face of the tool. In this case, the coolant supplied from the coolant supply port flows into the notch through this space. When the coolant flows into the notch, the flow rate of the coolant flowing through the tool passage is reduced, and the desired coolant supply characteristics cannot be obtained. For this reason, in the tool holder disclosed in Patent Document 1, the protruding length of a tool in which the tool passage and the cutout have openings on the rear end face of the tool cannot be changed. The protruding length of a tool is the length by which the blade of the tool protrudes from the tip face of the main body member. Therefore, an object of the present disclosure is to disclose a technique that can change the tool projection length while maintaining the characteristics of coolant supply to the tool. [Means for solving the problem]

[0005] The first disclosure relates to a tool holder for holding a tool having at least one notch and a tool passage. The notch of the tool is formed by a notch surface cut into the outer peripheral surface of the tool, and has an opening in the rear end surface of the tool. The tool passage of the tool has an opening in a region of the rear end surface of the tool that is closer to the center line of the tool than the opening of the notch. The tool holder of the present disclosure comprises a body portion, a tool holding mechanism, and a movable member. The main body has an inner circumferential surface, a tip end surface, a space inside the main body defined by the inner circumferential surface, an inlet, and a first passage connecting the inlet and the space inside the main body. The space inside the main body extends in the axial direction and has an opening at the tip end through which a tool can be inserted. The tool holding mechanism is configured to be able to detachably hold a tool inserted into the space inside the main body. As the tool holding mechanism, a known tool holding mechanism that includes a cutout surface forming the cutout as a component, or a known tool holding mechanism that does not include a cutout surface forming the cutout as a component, can be used. The movable member has a leading end surface, a rear end surface, an outer circumferential surface, and a through hole formed between the leading end surface and the rear end surface of the movable member. The movable member is disposed within the space inside the main body so as to be movable along the inner circumferential surface of the main body with the gap between the outer circumferential surface of the movable member and the inner circumferential surface of the main body sealed. When coolant is supplied from the inlet through the first passage into the space inside the body, the movable member moves toward the tip along the inner circumferential surface of the body, and the tip surface of the movable member abuts against the rear end surface of the tool inserted in the space inside the body with the tool passage of the tool facing the through hole of the movable member. In the present disclosure, when the tool extension length is long, the movable member moves to the tip side and the tip surface of the movable member abuts against the rear end surface of the tool, thereby preventing the coolant from flowing from the through hole of the movable member into the notch of the tool. By using the tool holder of the present disclosure, it is possible to use a tool having a tool passage and a cutout portion that opens onto the rear end face of the tool, and it is possible to change the tool projection length while maintaining the coolant supply characteristics to the tool. In a different embodiment of the first disclosure, the tip end surface of the movable member has a tip end surface portion protruding toward the tip side in a region around the through hole, and the tip end surface portion of the movable member is configured to abut against the rear end surface of the tool. In this embodiment, the tip end surface of the movable member and the rear end surface of the tool can be easily brought into contact with each other in a state in which the tool passage and the through hole of the movable member face each other. In a different embodiment of the first disclosure, the tip surface portion of the movable member is formed of an elastic body. In this embodiment, the tip end surface of the movable member and the rear end surface of the tool can be easily and reliably brought into contact with each other in a state in which the tool passage and the through hole of the movable member face each other. In a different embodiment of the first disclosure, a movement restricting surface that restricts movement of the movable member toward the rear end side within the main body internal space is provided. In this embodiment, the movable member can be restricted from moving rearward beyond a predetermined range. In a different embodiment of the first disclosure, the main body has an outlet formed on a tip surface of the main body, and a second passage that communicates the inlet and the outlet. The main body further includes a switching member that switches the second passage between an open state and a closed state. When the second passage is switched to the open state, the supply of coolant from the inlet to the outlet is permitted. When the second passage is switched to the closed state, the supply of coolant from the inlet to the outlet is prohibited. When a tool having a tool passage and a notch that are open to a rear end face of the tool is used, the second passage is switched to a closed state by the switching member. On the other hand, when a tool is used that has a notch that opens on the rear end surface of the tool but does not have a tool passage that opens on the rear end surface of the tool, the second passage is Open state In this case, the coolant is sprayed onto the cutting edge of the tool from an outlet formed on the tip surface of the main body. In this embodiment, a tool having a tool passage opening on the rear end surface and a tool not having a tool passage opening on the rear end surface can be used. In a different embodiment of the first disclosure, the tool holding mechanism has at least one hole formed in the main body portion and at least one anti-rotation member arranged within the at least one hole and movably along the extension direction of the hole. The hole opens to the inner circumferential surface of the main body and extends along the radial direction. The anti-rotation member is configured to move radially inward along the extension direction of the hole and protrude radially inward from the inner surface of the main body, thereby being able to abut against the cutout surface of a tool inserted into the inner space of the main body. In this embodiment, the tool can be held by utilizing the cutout portion of the tool. The second disclosure relates to a tool holding device including a tool holder for holding a tool and a support device for supporting the tool holder. As the tool holder, any one of the tool holders described above is used. The second disclosure has the same effect as the tool holder of the first disclosure. Effect of the Invention

[0006] By using the tool holder or tool holding device of the present disclosure, the tool overhang length can be changed while maintaining the coolant supply characteristics to the tool. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view showing a tool holding device according to an embodiment. [Diagram 2] 1 is a cross-sectional view showing a tool holder constituting a tool holding device according to an embodiment of the present invention; [Diagram 3] 1A and 1B are diagrams showing a movable member constituting a tool holder according to one embodiment; [Figure 4] FIG. 2 is a cross-sectional view showing a support device constituting the tool holding device of the embodiment. [Diagram 5] 2 is a cross-sectional view of FIG. 1 as seen in the direction of arrow VV. [Figure 6] FIG. 1 illustrates an example of a tool having a tool passage. [Figure 7] 11A and 11B are diagrams illustrating an operation of supplying coolant to a tool having a tool passage. [Figure 8] 11A and 11B are diagrams illustrating an operation of supplying coolant to a tool having a tool passage. [Figure 9] 11A and 11B are diagrams illustrating an operation of supplying coolant to a tool that does not have a tool passage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The following detailed description is intended to teach those skilled in the art the details for implementing the preferred embodiments of the present disclosure. The technical scope of the present invention is not limited by the detailed description, but is defined by the claims. Therefore, the combinations of configurations and methods in the following detailed description are not all essential to implementing the present invention in the broad sense, and the detailed description described together with the reference numbers of the attached drawings is intended to disclose a representative form of the present invention.

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a tool holding device and a tool holder according to the present disclosure will be described with reference to the drawings. In the following, the direction along the center line P of the space inside the main body is referred to as the "axial direction." The side where the tool is inserted into the space inside the main body (the side indicated by the arrow A in each drawing) is referred to as the "tip side" or "one axial side." The side opposite the side where the tool is inserted into the space inside the main body (the side indicated by the arrow B in each drawing) is referred to as the "rear end side" or "other axial side." Of course, the tip side and the rear end side may be in opposite directions. In addition, the direction of a line passing through center line P when viewed from one axial side or the other axial side is referred to as the "radial direction." In addition, the side of center line P along the radial direction is referred to as the "radial inner side," and the side opposite center line P is referred to as the "radial outer side." Moreover, the direction along a circle centered on the center line P when viewed from one axial side or the other axial side is referred to as the "circumferential direction." With regard to the tool, the terms "axial direction", "tip side", "rear end side", "radial direction", "radially inner", "radially outer", and "circumferential direction" refer to the "axial direction", "tip side", "rear end side", "radial direction", "radially inner", "radially outer", and "circumferential direction" when the tool is inserted into the inner space of the main body.

[0010] One embodiment 100 of a tool holding device of the present disclosure will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a tool holding device 100. Fig. 2 is a cross-sectional view of a tool holder 300 that constitutes the tool holding device 100. The tool holder 300 shown in Fig. 2 is one embodiment of the tool holder of the present disclosure. FIG. 3 is a diagram showing a movable member 500 constituting the tool holder 300. As shown in FIG. Figure 3(a) 1 is a cross-sectional view of a movable member 500. Figure 3(b) teeth, Figure 3(a) This is a view from the direction of arrow b. FIG. 4 is a cross-sectional view showing a support device 200 constituting the tool holding device 100. As shown in FIG. FIG. 5 is a cross-sectional view of FIG. 1 as seen in the direction of arrow VV. FIG. 6 is a diagram showing an example of a tool having a tool passage that opens on the rear end surface of the tool.

[0011] First, an example of a tool 700 that can be used with the tool holding device 100 will be described with reference to FIG. The tool 700 has a tool body member 710 extending in the axial direction. A blade 720 is provided on the tip side of the tool body member 710. The tool body member 710 has a tool body member outer peripheral surface 712. In this embodiment, the tool body member outer peripheral surface 712 extends along a circle centered on the tool center line T. The tool center line T is Tool body material This is the center line of 710. The tool body member 710 has a notch 730 extending in the axial direction on the outer circumferential side. In Fig. 6, the notch 730 is provided at two locations facing each other in the circumferential direction. The number and formation positions of the notch 730 can be appropriately selected. The notch 730 is formed by a notch surface 731 cut out from the outer circumferential surface 712 of the tool body member. Figure 6 , the cutout surface 731 extends in a direction perpendicular to a line passing through the tool center line T and in the axial direction. Further, the cutout portion 730 opens to the tool rear end surface 710B. That is, the cutout portion 730 has an opening portion 730b formed in the tool rear end surface 710B. moreover, Tool body material The tool passage 710 has a tool passage 740 for injecting coolant. The tool passage 740 extends in the axial direction. The tool passage 740 opens to the tool rear end face 710B. That is, the tool passage 740 has an opening 740b formed in the tool rear end face 710B. The opening 740b is formed in an area closer to the tool center line T than the opening 730b. Figure 6 In the example shown in FIG. 1, a tool passage 740 is formed in the center of a tool body member 710. The tool passage 740 has an ejection port 740a formed on the tip side of the tool body member 710. The ejection port 740a is formed near a blade 720 so that coolant is ejected in the direction of the blade 720. The outer peripheral surface 712 of the tool body member corresponds to the "outer peripheral surface of the tool" of the present invention.

[0012] The tool holding device 100 of this embodiment is made up of a support device 200 and a tool holder 300.

[0013] The tool holder 300 has a main body, a tool holding mechanism, and a movable member 500 . The main body is composed of a main body member 400 and a cover 240. In this embodiment, the cover 240 is attached to a support member 220 that constitutes the support device 200. For this reason, the cover 240 will be described later together with the support device 200.

[0014] The main body member 400 is formed in a cylindrical shape, and has a main body member front end surface 400A, a main body member rear end surface 400B, a main body member inner circumferential surface 401, and a main body member outer circumferential surface 402. A body member inner space 400a extending in the axial direction is formed by the body member inner peripheral surface 401. The body member inner space 400a has an opening 400C formed in the body member front end surface 400A and an opening 400D formed in the body member rear end surface 400B. The body member inner space 400a is formed so that the tool 700 can be inserted from the front end side (the opening 400C side).

[0015] Body member inner circumferential surface 401 has body member inner circumferential surface portions 401a to 401g. Body member inner circumferential surface portions 401a to 401g have a circular cross section. The main body member inner peripheral surface portions 401a and 401c extend in the axial direction. The inner diameter of the main body member inner peripheral surface portion 401c is set to be larger than the inner diameter of the main body member inner peripheral surface portion 401a. The main body member inner peripheral surface portion 401b extends in the radial direction and forms a step surface connecting the main body member inner peripheral surface portions 401a and 401c. The main body member inner peripheral surface portion 401a forms the main body member inner space portion 400b. Furthermore, the main body member inner peripheral surface portion 401c forms the main body member inner space portion 400c. The main body member inner peripheral surface portion 401b acts as a movement restricting surface that restricts the movement of the movable member 500 toward the tip side, which will be described later. The main body member inner peripheral surface portion 401a is formed so that, in a state in which the tool 700 is inserted into the main body member inner space portion 400b, the tool center line T of the tool 700 extends parallel to the axial direction. Specifically, the inner wall of the main body member inner space 400a (main body member inner space portion 400b) is set so that the tool center line T of the tool 700 extends parallel to the axial direction. The body member inner peripheral surface portions 401d-401g form a recess 401A that is recessed toward the outer diameter side and extends in the circumferential direction. A ring member 600, which will be described later, is disposed in the recess 401A.

[0016] Body member outer circumferential surface 402 has body member outer circumferential surface portions 402a to 402c. Body member outer circumferential surface portions 402a, 402b and body member tip surface 400A form a flange portion 410 extending radially outward. At a predetermined position of the flange portion 410, the tip surface 400A of the main body member and the outer peripheral surface portion of the main body member 402b A through hole 420 is formed in the support member 220, which communicates with the outer circumferential surface portion 402b of the main body member 202. A pin 421 is inserted into the through hole 420. The pin 421 is inserted so as to protrude from the outer circumferential surface portion 402b of the main body member 202. The pin 421 is inserted into a recess 223 of the support member 220, which will be described later. An O-ring 422 is disposed between the wall surface of the through-hole 420 and the pin 421 . A groove 430 extending in the axial direction is formed on the rear end side of the outer circumferential surface portion 402c of the main body member. A pin 225, which will be described later, is inserted into the groove 430.

[0017] Further, a through hole 440 that communicates with the main body member inner peripheral surface portion 401a and the main body member outer peripheral surface portion 402c is formed in a portion of the main body member outer peripheral surface 402 that corresponds to the main body member inner space portion 400b. In this embodiment, the through holes 440 are formed at two positions that face each other in the circumferential direction as shown in FIG. 5. Also, as shown in FIG. 2, the through holes 440 are formed at two positions that are spaced apart in the axial direction. A pin 441 (see FIG. 5) is inserted into the through hole 440. Specifically, a female thread formed on the inner peripheral surface of the through hole 440 and a pin 441The pin 441 is inserted into the through hole 440 by screwing together the male thread formed on the outer periphery of the pin 441 . The pin 441 is disposed so as to abut against the notched surface 731 of the tool 700 inserted into the body member inner space 400a. 441 The number and arrangement positions of the elements can be set appropriately. The pin 441 corresponds to a "rotation prevention member" of the present invention. The cutout surface 731 of the tool 700 and the pin 441 form a "tool holding mechanism" of the present invention.

[0018] Furthermore, the main body member 400 is formed with a passage 450 for supplying a coolant. The passage 450 has an inlet 450a extending in the axial direction and formed in the body member outer circumferential surface 402, a first outlet 450b formed in the body member rear end surface 400B, and a second outlet 450c formed in the body member front end surface 400A. The second outlet 450c is formed so that the coolant can be sprayed onto the blade of a tool inserted in the body member inner space 400a. The passage 450 has a first passage 450A and a second passage 450B. The first passage 450A communicates with the inlet 450a and the first outlet 450b. The first passage 450A supplies the coolant that has flowed into the inlet 450a to the first outlet 450b. 450B The second passage 450B connects the inlet 450a and the second outlet 450c. The second passage 450B supplies the coolant that has flowed into the inlet 450a to the second outlet 450c.

[0019] Also, a switching member that switches the second passage 450B between an open state and a closed state is provided. In this embodiment, the switching member has a hole 461 formed in the main body member 400 and a pin 460 that is inserted into the hole 461. The hole 461 extends in the axial direction and opens to the main body member tip surface 400 A. The hole 461 has an inner circumferential surface formed with a female screw. Furthermore, a male thread is formed on the outer circumferential surface of pin 460, which can be screwed into a female thread formed on the inner wall of hole 461. Pin 460 is inserted into hole 461 with the male thread and the female thread screwed together. This allows pin 460 to move along the extension direction of hole 461. When the pin 460 is rotated in one direction, the pin 460 moves to the rear end side (the left side in FIG. 2), which closes the second passage 450B and inhibits (stops) the supply of coolant from the inlet 450a to the second outlet 450c. On the other hand, when the pin 460 is rotated in the other direction, the pin 460 moves to the tip side (to the right in FIG. 2), which opens the second passage 450B and allows the supply of coolant from the inlet 450a to the second outlet 450c. The second outlet 450c corresponds to the "outlet formed on the tip surface of the main body" of the present invention. The second passage 450B corresponds to the "second passage communicating the inlet and the outlet" of the present invention. The pin 460 corresponds to the "switching member capable of switching the second passage between an open state that allows the supply of coolant from the inlet to the outlet and a closed state that prohibits the supply of coolant from the inlet to the outlet" of the present invention.

[0020] The movable member 500 is disposed within the body member inner space 400a (specifically, the body member inner space portion 400c) so as to be movable along the body member inner circumferential surface 401 (specifically, the body member inner circumferential surface portion 401c). As shown in FIG. 3, the movable member 500 has a movable member tip surface 500A, a movable member rear end surface 500B, an inner circumferential surface of the movable member, an outer circumferential surface of the movable member, and a through hole formed between the movable member tip surface 500A and the movable member rear end surface 500B. In this embodiment, the movable member 500 is composed of a first member 510, a second member 520, and a third member 530. The first member 510 and the second member 520 are made of a metal (e.g., stainless steel), and the third member 530 is made of an elastic body. For example, rubber is used as the elastic body.

[0021] The first member 510 is formed in a cylindrical shape, and has a front end surface 510A, a rear end surface 510B, an inner circumferential surface 511, and an outer circumferential surface 512. The inner circumferential surface 511 has inner circumferential surface portions 511a to 511g. The outer circumferential surface 512 has outer circumferential surface portions 512a to 512c. The inner peripheral surface portions 511a, 511c, 511e, 511g and the outer peripheral surface 512 extend in the circumferential and axial directions and have a circular cross section. The front end surface 510A, the rear end surface 510B, and the inner circumferential surface portions 511b, 511d, and 511f extend in the circumferential and radial directions. Outer peripheral surface portions 512a to 512c form a groove 513 extending in the circumferential direction. An O-ring 514 is disposed in groove 513. As a result, movable member 500 is configured to be movable along main body member inner peripheral surface portion 401c with the gap between outer peripheral surface 512 and main body member inner peripheral surface portion 401c sealed by O-ring 514.

[0022] The second member 520 is formed in a cylindrical shape, and has a front end surface 520A, a rear end surface 520B, an inner circumferential surface 521, and an outer circumferential surface 522. The outer circumferential surface 522 has outer circumferential surface portions 522a to 522c. The inner peripheral surface 521 and the outer peripheral surface portions 522a, 522c extend in the circumferential and axial directions and have a circular cross section. The leading end surface 520A, the rear end surface 520B, and the outer circumferential surface portion 522b extend in the circumferential direction and the radial direction. The second member 520 is inserted into the inner space formed by the inner circumferential surface 511 of the first member 510. At this time, the outer circumferential surface portions 522b and 522c of the second member 520 come into contact with the inner circumferential surface portions 511f and 511g of the first member 510, respectively. 。 This restricts radial and axial movement of the second member 520 relative to the first member 510.

[0023] The third member 530 is formed in a cylindrical shape, and has a front end surface 530A, a rear end surface 530B, an inner circumferential surface 531, and an outer circumferential surface 532. The outer circumferential surface 532 includes outer circumferential surface portions 532a to532e It has. The inner peripheral surface 531 and the outer peripheral surface portions 532a, 532c, 532e extend in the circumferential and axial directions and have a circular cross section. The leading end surface 530A, the rear end surface 530B, and the outer circumferential surface portions 532b, 532d extend in the circumferential and radial directions. The third member 530 is disposed between the first member 510 and the second member 520. At this time, a protrusion formed by inner circumferential surface portions 511b-511d of the first member 510 fits into a recess formed by outer circumferential surface portions 532b-532d of the third member 530. This restricts radial and axial movement of the third member relative to the first member 510. Additionally, the outer circumferential surface portion 522b of the second member 520 abuts against the rear end surface 530B of the third member 530. This restricts the movement of the second member 520 relative to the third member 530 in the axial direction.

[0024] In this embodiment, the first member 510 A movable member tip surface 500A is formed by a tip surface 510A of the first member 520, a tip surface 520A of the second member 520, and a tip surface 530A of the third member 530. The tip surfaces 510A, 520A, and 530A constitute a movable member tip surface portion of the movable member tip surface 500A. A movable member rear end surface 500B is formed by a rear end surface 510B of the first member 510 and a rear end surface 520B of the second member 520. The rear end surfaces 510B and 520B constitute a movable member rear end surface portion of the movable member rear end surface 500B. An inner circumferential surface of the movable member is formed by an inner circumferential surface 521 of the second member 520 . The through hole of the movable member 500 is formed by the through hole 540 of the second member 520 . The outer circumferential surface 512 of the first member 510 defines the outer circumferential surface of the movable member.

[0025] In this embodiment, the movable member 500 is disposed in the inner space of the main body member. 400c In the state in which the movable member 500 is disposed within the main body member inner space 400a, the center line of the through hole 540 of the movable member 500 is configured to substantially coincide with the center line P of the main body member inner space 400a. In addition, the inner diameter of the through hole 540 of the movable member 500 (more specifically, the inner diameter of the opening 540a at the tip end of the through hole 540) is set to be approximately equal to the inner diameter of the tool passage 740 of the tool 700 (more specifically, the opening 740b at the rear end of the tool passage 740). Moreover, movable member tip surface portion 530A of movable member 500 is disposed around through-hole 540 (more specifically, around opening 540a of through-hole 540). Moreover, the movable member tip surface portion 530A protrudes further to the tip side than the movable member tip surface portions 510A and 520A. As a result, when the movable member tip surface 500A of the movable member 500 abuts against the tool rear end surface 710B of the tool 700, the movable member tip surface portion 530A abuts against the periphery of the tool passage 740 (opening 740b) of the tool rear end surface 710B with the through hole 540 (opening 540a) of the movable member 500 facing the tool passage 740 (opening 740b). In other words, no space is generated between the movable member tip surface portion 530A and the tool rear end surface 710B. Therefore, the coolant can be prevented from flowing from the through-hole 540 of the movable member 500 to the tool notch 730 of the tool 700 . Furthermore, the movable member tip surface portion 530A is formed of an elastic body. This allows the movable member tip surface portion 530A and the tool rear end surface 710B to be reliably abutted against each other. In other words, it is possible to reliably prevent a space from being generated between the movable member tip surface portion 530A and the tool rear end surface 710B. In addition, the phrase "a state in which the through hole 540 (opening 540a) of the movable member 500 and the tool passage 740 (opening 740b) are opposed to each other" means "a state in which the through hole 540 (opening 540a) of the movable member 500 and the tool passage 740 (opening 740b) at least partially overlap in the axial direction."

[0026] The ring member 600 has a ring member leading end surface 600A, a ring member rear end surface 600B, and a through hole 600a formed between the ring member leading end surface 600A and the ring member rear end surface 600B. The ring member leading end surface 600A and the ring member rear end surface 600B extend in the circumferential direction and the radial direction. Ring member outer surfaceis formed in a circular shape. Ring member outer surface The shape is not limited to a circle. As shown in FIG. 2, the ring member 600 is disposed in a recess 401A formed on the rear end side of the main body member inner space 400a. A ring member tip surface 600A of the ring member 600 acts as a movement restricting surface that restricts the movement of the movable member 500 towards the rear end side. In addition, the through hole of the ring member 600 600a acts as a coolant inlet for supplying coolant to the body member inner space 400a.

[0027] The support device 200 includes a base 210 and a support portion. The base 210 has a mounting surface 211 to which the support is attached. The base 210 also has a passage 212 formed therein for supplying a coolant.

[0028] The support portion is composed of a support member 220 and a sleeve 230 . The support member 220 is formed in a cylindrical shape, and has a support member front end surface 220A and a support member rear end surface 220B , a support member inner circumferential surface 221, a support member inner space 220a formed by the support member inner circumferential surface 221, and a mounting surface 222. The support member inner circumferential surface 221 has a circular cross section. The support member 220 is attached to the base 210 so that the mounting surface 222 faces the mounting surface 211 . A recess 223 is formed in the supporting member tip surface 220A. In addition, the support member 220 has an outer peripheral surface and Inner surface of support member A through hole 224 is formed between them. A female screw that can be screwed to a male screw formed on the outer periphery of the pin 225 is formed on the inner periphery of the through hole 224. Furthermore, in the support member 220 , a passage 226 is formed at a position opposite to the passage 212 formed in the base 210 .

[0029] The sleeve 230 is formed in a cylindrical shape and has a sleeve front end surface 230A, a sleeve rear end surface 230B, a sleeve inner circumferential surface 231, a sleeve outer circumferential surface 232, and a sleeve inner space 230a formed by the sleeve inner circumferential surface 231. The sleeve inner peripheral surface 231 and the sleeve outer peripheral surface 232 have a circular cross section. The sleeve outer peripheral surface 232 has sleeve outer peripheral surface portions 232a to 232e. The outer diameter of the sleeve outer peripheral surface portion 232c is set to be smaller than the outer diameters of the sleeve outer peripheral surface portions 232a and 232e. The outer diameters of the sleeve outer peripheral surface portions 232b and 232d are set to be smaller than the outer diameter of the sleeve outer peripheral surface portion 232c. As a result, the sleeve inner peripheral surface 231 and the sleeve outer peripheral surface portion 232b and 232d, thin gripping portions 234a and 234b are formed. The sleeve 230 is inserted into and fixed in the support member inner space 220a. At this time, pressurizing chambers 233a and 233b are formed between the support member inner circumferential surface 221 and the sleeve outer circumferential surface portions 232b and 232d. Also, a communication passage 233c communicating with the pressurizing chambers 233a and 233b is formed between the support member inner circumferential surface 221 and the sleeve outer circumferential surface portion 232c. The support member inner space 220a and the sleeve inner space 230a form a support part inner space. 221c ) and the sleeve inner peripheral surface 231 form the support portion inner peripheral surface. Furthermore, the sleeve 230 has a through hole 235 formed at a position opposite to the through hole 224 formed in the support member 220 . Furthermore, the sleeve 230 has a passage 236 formed in a position opposite the passage 226 formed in the support member 220 .

[0030] As shown in FIG. 1, the body member 400 is inserted into the sleeve inner space 230a (support portion inner space). At this time, the main body member 400 is inserted until the main body member outer circumferential surface portion 402b abuts against the support member tip surface 220A. This defines the position of the main body member 400 (tool holder 300) along the axial direction relative to the support member 220 (support portion). Furthermore, pin 421 (see FIG. 2) inserted into through hole 420 of main body member 400 is inserted into recess 223 formed in support member 220. This defines the position of main body member 400 (tool holder 300) in the circumferential direction relative to support member 220 (support portion). Furthermore, pin 225 is moved radially inward and inserted into through hole 224 of support member 220 and through hole 235 of sleeve 230. Furthermore, the tip of pin 225 is inserted into groove 430 of main body member 400. This restricts movement toward the rear end and rotation (position) along the circumferential direction of main body member 400 (tool holder 300) relative to support member 220 (support portion). When the position of the body member 400 relative to the support member 220 in the circumferential direction is determined, the inlet 450 a of the body member 400 is disposed at a position facing the passage 236 of the sleeve 230 . In the embodiment, the pin 421 and the pin 225 are provided, but only one of them may be provided. That is, the pin 421 or the pin 225 may be configured to define the position of the main body member 400 (tool holder 300) in the circumferential direction relative to the support member 220 (support portion).

[0031] In addition, the support member 220 of the main body member 400 for With the circumferential position adjusted, the pressure in the pressurizing chambers 233a and 233b is increased. When the pressure in the pressurizing chambers 233a and 233b is increased, the portions of the sleeve inner circumferential surface 231 that correspond to the gripping portions 234a and 234b are elastically deformed inward, whereby the body member outer circumferential surface 402 of the body member 400 is clamped by the gripping portions 234a and 234b.

[0032] The support member 220 includes a cover 240. butIn this embodiment, the cover 240 is attached to the support member 220 such that a front end surface 240A of the cover 240 abuts against a rear end surface 220B of the support member 220. An O-ring 242 is disposed between the front end surface 240A of the cover 240 and the rear end surface 220B of the support member 220. The cover 240 closes the rear end of the body member inner space 400a of the body member 400 inserted into the sleeve inner space 230a (support portion inner space). That is, the main body inner space is formed by the main body member inner space 400a and the cover inner space 240a. The coolant supplied from the passage 212 of the base 210 is supplied into the main body inner space via the passage 226 of the support member 220, the passage 236 of the sleeve 230, the inlet 450a of the main body member 400, the first passage 450A, and the first outlet 450b. In this embodiment, the main body of the tool holder 300 is constituted by the main body member 400 and the cover 240. The main body member inner space 400a and the cover inner space 240a form a main body inner space of the tool holder 300. The main body member inner peripheral surface 401 and the cover inner peripheral surface 241 form the main body inner peripheral surface of the tool holder 300.

[0033] Next, the operation of this embodiment will be described. First, a case will be described in which a tool 700 shown in FIG. 5 is used, in which a cutout portion 730 having an opening 730b is formed in the tool rear end face 710B, and a tool passage 740 having an opening 740b is formed in the tool rear end face 710B.

[0034] The operation when the tool 700 is inserted into the main body member inner space 400a so that the tool protrusion length is the shortest will be described with reference to Fig. 7. In Fig. 7, the pin 460 is set to a position that switches the second passage 450B to a closed state. That is, the supply of coolant from the inlet 450a to the second outlet 450c is stopped. In Fig. 7, movable member rear end surface 500B (movable member rear end surface portion 510B) of movable member 500 abuts against ring member tip surface 600A of ring member 600. Also, tool rear end surface 710B of tool 700 abuts against movable member tip surface 500A (movable member tip surface portion 530A) of movable member 500. In the state shown in Fig. 7, the tool protrusion length is L1. In the state shown in FIG. 7, the coolant supplied from the passage 212 of the base 210 flows into the space inside the main body through the inlet 450a, the first passage 450A, and the first outlet 450b of the main body member 400. Then, the coolant flows into the tool passage 740 through the through hole 540 of the movable member 500. At this time, the pressure of the coolant is applied to the movable member rear end surface 500B (movable member rear end surface portions 520B and 530B) of the movable member 500, but since the tool 700 does not move to the tip side, the movable member 500 does not move to the tip side either. Therefore, the coolant does not flow from the through hole 540 of the movable member 500 to the notch portion 730 of the tool 700.

[0035] The operation when the tool 700 is inserted into the main body member inner space 400a so that the tool protrusion length becomes L2 which is longer than L1 will be described with reference to FIG. In Fig. 8, the tool rear end surface 710B is disposed at a position further forward than the position shown in Fig. 7. In the state shown in Fig. 8, the tool protrusion length is L2 (>L1). In Fig. 8, similarly to Fig. 7, the pin 460 is set at a position for switching the second passage 450B to the closed state. In the state shown in Fig. 8, the movable member 500 is located in the region between the ring member tip surface 600A of the ring member 600 and the tool rear end surface 710B. Note that Fig. 8 shows a state in which coolant is supplied into the space inside the main body. In this state, when coolant is supplied into the space inside the main body through the inlet 450a, the first passage 450A and the first outlet 450b of the main body member 400, the coolant flows through the through hole 540 of the movable member 500. At the same time, the pressure of the coolant is applied to the movable member rear end surface of the movable member 500 (movable part rear end surface portions 510B and 520B). As a result, the movable member 500 moves toward the tip side. Then, when the movable member tip surface 500A of the movable member 500 comes into contact with the tool rear end surface of the tool 700, the movable member 500 moves toward the tip side. 710B abuts against. At this time, with the through hole 540 (opening 540a) of the movable member 500 and the tool passage 740 (opening 740b) of the tool 700 facing each other, the movable member tip surface 500A (movable member tip surface portion 530A) abuts the area of ​​the tool rear end surface 710B around the tool passage 740 (opening 740b). Therefore, the coolant does not flow from the through hole 540 of the movable member 500 to the notch 730 of the tool 700 . 8, as shown in Fig. 2, the main body member inner space portion 400c formed by the main body member inner circumferential surface portion 401c is divided by the movable member 500. That is, the main body member inner space portion 400c is divided into a first divided inner space portion 400c1 on the tip side of the movable member 500 and a second divided inner space portion 400c2 on the rear side of the movable member 500.

[0036] Next, an operation when a tool 800 without a tool passage is used will be described with reference to FIG. The tool 800 has a notch 830 having an opening 830b formed on the rear end surface 810B of the tool. 、 No tool passage having an opening is formed in the tool rear end surface 810B. When such a tool 800 is used, it is necessary to spray the coolant from the second outlet 450c formed in the body member tip surface 400A of the body member 400. In FIG. 9, the tool 800 is inserted into the main body member inner space 400a so that the tool protrusion length is L3. The operation when using the tool 800 is the same regardless of the tool protrusion length. In FIG. 9, the pin 460 is set to a position that switches the second passage 450B to an open state. That is, the supply of coolant from the inlet 450a to the second outlet 450c is permitted. The coolant supplied to the inlet 450a is supplied into the space inside the main body through the first passage 450A, and flows to the second outlet 450c through the second passage 450B. As the coolant is supplied into the space inside the main body, as described above, the movable member tip surface 500A (movable member wire tip surface 530A) of the movable member 500 is in contact with the tool rear end surface 810B Since the tool 800 does not have a tool passage, the coolant does not flow into the tool passage. 810B 5, the coolant does not flow from the through hole 540 of the movable member 500 to the notch 830 of the tool 800. Therefore, a sufficient amount of coolant is sprayed from the second outlet 450c.

[0037] In the above embodiment, a tool holding mechanism configured by a notch surface forming a notch portion of a tool and a rotation preventing member is used, but other known tool holding mechanisms can be used. For example, a tool holding mechanism formed by a collet that holds the outer peripheral surface of the tool, as disclosed in Patent Document 1, can be used. Also, like the main body member holding mechanism that holds the main body member on the sleeve in the embodiment, a tool holding mechanism that is configured with a pressurizing chamber and an elastically deformable gripping portion can be used. Also, a plurality of tool holding mechanisms may be used, for example, a tool holding mechanism formed by a collet and a tool holding mechanism formed by a cutout surface of a tool and a rotation preventing member may be used. In the embodiment, the movable member 500 is configured by three members (510 to 530), but is not limited to this. For example, the movable member 500 may be configured by one member. Alternatively, the movable member 500 may be configured by a number of members other than three. In the embodiment, the movable member tip surface 500A is formed by the movable member tip surface portion 530A, the movable member tip surface portion 520A arranged at a position on the rear end side radially inward from the movable member tip surface portion 530A, and the movable member tip surface portion 510A arranged at a position on the rear end side radially outward from the movable member tip surface portion 530A, but is not limited thereto. That is, the movable member tip surface 500A only needs to be able to prevent coolant from flowing from the opening 540a of the through hole 540 of the movable member 500 to the notch 730 of the tool 710 when the movable member tip surface 500A and the tool rear end surface 710B are in contact with each other. For example, the movable member tip surface 500A can be formed by one surface. Alternatively, the movable member tip surface 500A can be formed by a plurality of movable member tip surface portions other than three. Furthermore, the arrangement position of the movable member tip surface portion protruding to the tip side can be changed as appropriate.

[0038] The present disclosure is not limited to the configurations described in the embodiments, and various modifications, additions, and deletions are possible. Although the detailed description describes a tool holding device, a tool holder is also disclosed. Although the main body of the tool holder is constituted by the main body member and the cover, an integrally formed member may also be used. Although the ring member is disposed within the space inside the main body member, the ring member may be formed integrally with the main body member, or the ring member may be omitted. Although the distal end surface of the ring member is used as the movement restricting surface that restricts the movement of the movable member toward the rear end side, and the inner peripheral surface portion of the main body member is used as the movement restricting surface that restricts the movement of the movable member toward the distal end side, the movement restricting surfaces are not limited to this. Also, the movement restricting surfaces may be omitted. Although the support device is configured by the base, the support member, and the sleeve, the support device is not limited to this. The anti-rotation member for preventing the rotation of the tool may have various configurations as long as it can be engaged with the notch (including the notch surface) formed in the tool. The number and arrangement of the anti-rotation members may be changed as appropriate. Each of the configurations described in the detailed description may be used alone, or multiple appropriately selected configurations may be used in combination. [Explanation of symbols]

[0039] 100 Tool holding device 200 Support device 210 Foundation 211 Mounting surface Aisle 212 220 Support member 220A Support member tip surface 220B Rear end face of support member 221 Inner surface of support member 221a~221c Inner peripheral surface part of support member 222 Mounting surface 223 Recess 224 Through hole 225 pin 226 aisle 230 Sleeve 230A Sleeve tip surface 230B Sleeve rear end 231 Sleeve inner surface 232 Sleeve outer surface 232a~232e Sleeve inner surface portion 233a, 233b Pressurized chamber 233c Communication path 234a, 234b gripping part 235, 236 Through holes 240 Cover 240A Cover tip surface 240a Space inside the cover 241 Inner surface of cover 300 Tool holder 400 Body material 400A Main body part tip surface 400B Main body rear end surface 400a: Main body member inner space 400b, 400c Main body member inner space portion 401 Inner surface of main body member 401A Recess 401a to 401g: Inner surface of main body member 402 Outer periphery of main body member 402a-402c: Outer circumferential surface portion of main body member 410 Flange 420 Through hole 421 Pin 422 O-ring 430 Groove 440 Through hole 441 Pin 450 Aisle 450A 1st Aisle 450B 2nd aisle 450a inlet 450b First outlet 450c second outlet 460 Pin (switching member) 461 holes 500 Moving parts 500A Movable part tip surface 500B Rear end of movable part 510 First member 510A Tip surface 510B Rear end surface 511 Inner surface 511a~511g Inner peripheral surface part 512 Outer surface 512a~512c Outer surface part 513 Groove 514 O-ring 520 Second member 520A Tip surface 520B Rear end surface 521 Inner surface 522 Outer surface 522a~522c Outer surface part 530 Third member 530A Tip surface 530B Rear end surface 531 Inner surface 532 Outer surface 532a~532e Outer surface part 540 Through hole 540a, 540b opening 600 Ring member 600A Ring member tip surface 600B Ring component rear end surface 600a through hole 700, 800 tools 710, 810 Tool body parts 710B, 810B Tool rear end surface 712, 812 Tool outer surface 720, 820 blade 730 Notch 730b opening 731, 831 Notched surface 740, 840 Tool aisle 740a injection port 740b opening

Claims

1. A tool holder for holding a tool, the tool holder having at least one cutout portion and a tool passage, the cutout portion being formed by a cutout surface cut out of an outer peripheral surface of the tool, the cutout portion having an opening in a rear end surface of the tool, the tool passage having an opening in a region of the rear end surface of the tool that is closer to a center line of the tool than the opening of the cutout portion, The tool holder includes a main body, a tool holding mechanism, and a movable member. the main body has a main body inner circumferential surface, a main body tip surface, a main body inner space formed by the main body inner circumferential surface, an inlet, and a first passage connecting the inlet and the main body inner space, the main body inner space extending in the axial direction and having an opening at a tip side into which the tool can be inserted, The tool holding mechanism is configured to be able to detachably hold the tool inserted into the main body inner space, the movable member has a movable member leading end surface, a movable member rear end surface, a movable member outer circumferential surface, and a through hole formed between the movable member leading end surface and the movable member rear end surface, and is disposed within the main body portion inner space so as to be movable along the main body portion inner circumferential surface with a gap between the movable member outer circumferential surface and the main body portion inner circumferential surface being sealed; a tool holder configured such that, when coolant is supplied from the inlet through the first passage into the space inside the main body, the movable member moves toward the tip side along the inner surface of the main body, and the tip surface of the movable member abuts against the rear end surface of the tool inserted into the space inside the main body with the tool passage of the tool facing the through hole of the movable member.

2. 2. The tool holder of claim 1, the movable member tip surface has a movable member tip surface portion protruding toward the tip side in a region around the through hole, A tool holder characterized in that a tip end surface portion of the movable member is configured to abut against a rear end surface of the tool.

3. A tool holder as claimed in claim 2, A tool holder characterized in that a tip surface portion of the movable member is formed of an elastic material.

4. A tool holder according to any one of claims 1 to 3, A tool holder comprising: a movement restricting surface that restricts movement of the movable member toward the rear end side within the space inside the main body.

5. A tool holder according to any one of claims 1 to 4, The main body has an outlet formed on a tip surface of the main body, and a second passage communicating the inlet and the outlet, Further, a switching member for switching the second passage between an open state and a closed state is provided, A tool holder characterized in that, when the second passage is switched to the open state, the supply of the coolant from the inlet to the outlet is permitted, and when the second passage is switched to the closed state, the supply of the coolant from the inlet to the outlet is prohibited.

6. A tool holder according to any one of claims 1 to 5, a tool holder characterized in that the tool holding mechanism has at least one hole formed in the main body portion, opening onto an inner circumferential surface of the main body portion, and extending along a radial direction; and at least one anti-rotation member disposed within the hole, movable along the extension direction of the hole, and capable of abutting the cutout surface of the tool inserted into the inner space of the main body portion.

7. A tool holding device including a tool holder for holding a tool and a support device for supporting the tool holder, A tool holding device, comprising the tool holder according to any one of claims 1 to 6 as the tool holder.