JP7024963B2 - Tool holding device - Google Patents

Description

The present invention relates to a tool holding device for holding a tool, and more particularly to a technique capable of stabilizing a tool mounting height and mounting phase.

As a tool holding device for holding a tool having a circular outer peripheral surface of the tool (specifically, a tool shank portion), a tool holding device using a side lock mechanism is described in, for example, Patent Document 1 (actual opening flat 5-674040). It is disclosed in the Gazette. The side lock mechanism forms a contact portion such as a flat surface or a hole on the outer peripheral surface of the tool, and holds the tool in a state where the tool is inserted into the space inside the tool holding portion (referred to as "tool holding space") of the tool holding portion. The tool is held in the space inside the tool holding portion by pressing the contact portion of the tool with the lock bolt inserted into the screw hole formed in the portion.

Jitsukaihei No. 5-674040 Japanese Unexamined Patent Publication No. 5-50361

In the tool holding device using the side lock mechanism disclosed in Patent Document 1, the holding position of the tool varies depending on the difference between the inner diameter of the inner space of the tool holding portion and the outer diameter of the tool. That is, the mounting height of the tool varies, and the rotation phase of the cutting edge of the tool (referred to as "rotation phase of the tool") is not stable.
In this case, every time the tool is replaced, it is necessary to measure the rotation phase of the tool and make a correction by using, for example, a measuring device as disclosed in Patent Document 2. However, in order to measure the rotation phase of a tool using such a measuring device, an expensive measuring device is required and it is troublesome.
As a method of preventing variations in the mounting height of the tool in the space inside the tool holding portion, it is conceivable to use a holding mechanism having centering properties. For example, by using hydraulic pressure or the like to elastically deform the inner peripheral surface of the tool holding portion that forms the inner space of the tool holding portion in the direction of the center line and bring it into contact with the outer peripheral surface of the tool, the tool is brought into contact with the inner space of the tool holding portion. Hold in the center.
However, when such a holding mechanism having centering property is used, there is a possibility that variation in the rotation direction of the tool (variation in mounting phase) may occur.
The present invention has been devised in view of such a point, and an object of the present invention is to provide a tool holding device capable of stabilizing the mounting height and mounting phase of a tool.

The tool holding device of the present invention includes a tool and a tool holding portion. The tool extends along the axial direction, is provided with a blade on the front end side, and is provided with a tool rear end surface and a tool shank portion on the rear end side. The tool holding portion has an inner peripheral surface of the tool holding portion that forms an inner space of the tool holding portion extending along the axial direction into which the tool shank portion can be inserted. The tool is held in a state where the tool shank portion is inserted into the space inside the tool holding portion. The present invention can be suitably used when the outer peripheral surface of the tool shank portion and the inner peripheral surface of the tool holding portion of the tool shank portion are formed in a circular shape when viewed in a cross section perpendicular to the axial direction.
In the present invention, the tool shank portion is provided with a notch portion that is open on the rear end surface of the tool and the outer peripheral surface of the tool shank portion. The notch portion is formed by the notch surface. The "notch portion" means, for example, a shape obtained by cutting out an outer peripheral portion of a rod-shaped member having a cross section having a predetermined shape (for example, a circle). The notched surface has a first surface that extends in a direction parallel to the axial direction (including "substantially parallel") and in a direction intersecting the axial direction. As the direction intersecting the axial direction, a direction perpendicular to the axial direction (including "substantially right angle") is preferably used. The notch is preferably configured such that both sides along the direction intersecting the axial direction open to the outer peripheral surface of the tool shank, but only one side along the direction intersecting the axial direction is the tool shank. It can also be configured so as to open to the outer peripheral surface of the portion and not to open to the outer peripheral surface of the tool shank portion on the other side.
Further, it is provided with a holding mechanism for holding the tool shank portion in the center of the inner space of the tool holding portion by bringing at least a part of the inner peripheral surface of the tool holding portion into contact with the outer peripheral surface of the tool shank portion. "At least a part of the inner peripheral surface of the tool holding portion" means a portion of the inner peripheral surface of the tool holding portion along the circumferential direction, and may be a continuous portion along the circumferential direction or along the circumferential direction. It may be a separated portion. As a holding mechanism for holding the tool shank portion in the center of the inner space of the tool holding portion by contacting at least a part of the inner peripheral surface of the tool holding portion with the outer peripheral surface of the tool shank portion, holding mechanisms having various known configurations are available. Can be used. For example, a holding mechanism can be used in which a thin-walled grip portion is formed along the circumferential direction in a part of the portion forming the inner space of the tool holding portion, and the grip portion is elastically deformed by hydraulic pressure or the like.
By using such a holding mechanism, the centripetal property is enhanced, and it is possible to prevent variations in the mounting height of the tool shank portion held in the space inside the tool holding portion.
Further, it is provided with a first rotation restricting member that regulates the rotation of the tool shank portion. The first rotation restricting member has a rotation restricting surface. The rotation control surface is formed so that the rotation of the tool shank portion can be regulated by abutting the first surface of the notch portion of the tool shank portion. Preferably, the rotation control surface is formed so as to extend at least in a direction intersecting the axial direction. As the first rotation restricting member, for example, a positioning pin having a circular cross section is used. In this case, the outer peripheral surface of the positioning pin is used as the rotation restricting surface.
Then, the first surface of the tool shank portion inserted into the inner space of the tool holding portion extends in the vicinity of the rotation regulating surface of the first rotation regulating member in the extending direction of the first surface intersecting the axial direction. However, it is configured so that it can be arranged along the extending direction of the rotation regulation surface.
In the present invention, the rotation of the tool shank portion in the space inside the tool holding portion is regulated by the first surface of the notch portion of the tool shank portion coming into contact with the rotation regulating surface of the first rotation regulating member. That is, the narrower the distance between the first surface and the rotation restricting surface, the more the variation in the rotation phase of the tool shank portion is suppressed. Therefore, the description "near the rotation restricting surface" indicates "a position as close as possible to the rotation restricting surface within the range in which the tool shank portion can be inserted into the space inside the tool holding portion". The arrangement position of the rotation restricting surface and the length along the extending direction are set so that the rotation of the tool shank portion can be regulated. For example, the length of the rotation restricting surface along the extending direction is set to a length that can restrict the rotation of the tool shank portion on one side and the rotation on the other side around the center line.
Further, it is provided with a second rotation regulating member that regulates the rotation of the tool shank portion. The second rotation restricting member has a contact surface and is arranged on one side of the first rotation restricting member along the extending direction of the rotation restricting surface.
Then, in the second rotation restricting member, the extending direction in which the first surface of the tool shank portion inserted into the inner space of the tool holding portion intersects the axial direction of the first surface in the vicinity of the rotation restricting surface. However, the contact surface is configured to be able to contact the first surface in a state where the contact surface is arranged along the extending direction of the rotation restricting surface. The timing at which the contact surface is brought into contact with the first surface of the tool shank portion can be appropriately set. For example, the contact surface may be configured to come into contact with the first surface when the tool shank portion is inserted into the inner space of the tool holding portion, or the tool shank portion may be inserted into the inner space of the tool holding portion. After that, the contact surface may be configured to come into contact with the first surface.
In the present invention, the mounting height of the tool is increased by using a holding mechanism that holds the tool shank portion in the center of the inner space of the tool holding portion by bringing the inner peripheral surface of the tool holding portion into contact with the outer peripheral surface of the tool shank portion. Can be stabilized. Further, by arranging the first surface of the notch portion of the tool shank portion inserted in the inner space of the tool holding portion in the vicinity of the rotation regulating surface of the first rotation regulating member, the rotation of the tool shank portion can be prevented. It can be regulated and the mounting phase of the tool can be stabilized. Further, when the contact surface of the second rotation restricting member is brought into contact with the first surface of the tool shank portion and pressed, the tool shank portion rotates and the first surface of the tool shank portion is subjected to the first rotation restriction. It abuts on the rotation control surface of the member. That is, the rotation phase of the tool shank portion (tool) is uniformly defined regardless of the type of tool. Therefore, it is possible to perform processing with high accuracy with a simple configuration.
In another aspect of the present invention, the tool holding portion is composed of a main body portion and a sleeve. The main body portion has an inner peripheral surface of the main body portion that forms an inner space of the main body portion. Further, the sleeve has an outer peripheral surface of the sleeve and an inner peripheral surface of the sleeve forming the inner space of the sleeve, and is arranged in a part of the inner space of the main body portion. The inner peripheral surface of the tool holding portion is formed by the inner peripheral surface of the main body portion and the inner peripheral surface of the sleeve. That is, the space inside the tool holding portion is formed by the space inside the main portion and the space inside the sleeve.
In this embodiment, the tool holding portion can be easily configured.
In another aspect of the invention, the notched surface has a second surface of the first surface formed between the distal end and the outer peripheral surface of the tool. The second surface extends in a direction intersecting the extending direction of the first surface. The extending direction of the second surface is set so that the cross-sectional area of the notch portion in the direction intersecting the axial direction becomes smaller from the end portion on the distal end side to the distal end side of the first surface. .. As the direction intersecting the extending direction of the first surface, a direction perpendicular to the extending direction of the first surface or a direction inclined with respect to the direction perpendicular to the extending direction of the first surface can be selected. Is.
In this embodiment, the second surface can be used as a positioning member or a stopper for the tool shank portion when the tool shank portion is inserted into the space inside the tool holding portion.
In another aspect of the invention, the notched surface has a third surface of the first surface formed between the rear end side end and the tool rear end surface. The third surface extends in a direction intersecting the extending direction of the first surface. The extending direction of the third surface is set so that the cross-sectional area of the notch in the direction intersecting the axial direction increases from the end on the rear end side of the first surface toward the rear end surface of the tool. Will be done. The third surface acts as a guide member when the first surface is arranged in the vicinity of the rotation restricting surface.
In this embodiment, the work of arranging the first surface of the tool shank portion in the vicinity of the rotation restricting surface of the first rotation restricting member can be easily performed.

In the tool holding device of the present invention, the mounting height and mounting phase of the tool can be stabilized.

It is sectional drawing of one Embodiment of the tool holding device of this invention. It is a figure which saw the tool used in the tool holding device of one Embodiment from the direction shown by the arrow II in FIG. It is a figure which saw the tool used in the tool holding device of one Embodiment from the direction shown by the arrow III in FIG. It is a figure explaining the outline of the tool holding device of one Embodiment. It is a figure which looked at the state which the tool shank part was inserted into the space inside the tool holding part, as seen in the IV-IV line cross section of FIG. The state in which the first cutout surface of the tool shank inserted into the inner space of the main body (inner space of the main body) is in contact with the outer peripheral surface of the positioning pin is shown in the IV-IV cross section of FIG. be.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present specification, the extending direction (X direction shown in FIG. 1, extending direction of the center line P) of the tool holding portion (main body portion 200, sleeve 300) is referred to as "axial direction", and the tool holding portion. The side where the tool shank portion of the tool 600 is inserted into the inner space (main body inner space 220, sleeve inner space 320) (X1 direction shown in FIG. 1) is called the "tip side", and the tool shank of the tool 600 is called the "tip side". The side opposite to the side where the portion is inserted (X2 direction shown in FIG. 1) is referred to as "rear end side". Further, in the cross section perpendicular to the axial direction (FIG. 3), the direction along the arc centered on the center line P is referred to as "circumferential direction", and the direction of the line passing through the center line P is referred to as "diameter direction".

A first embodiment 100 of the tool holding device of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of the tool holding device 100 of the first embodiment along the axial direction. This embodiment is preferably used as a tool holding device in a turret that holds a plurality of tools and selects the tools by turning.
The tool holding device 100 of the first embodiment includes a main body 200, a sleeve 300, a positioning pin 400, a ball plunger 500, and a tool 600. Although only the tool shank portion of the tool 600 is shown in FIG. 1, the tool 600 is provided with a blade on the tip side (left side in FIG. 1).

The main body 200 has an inner peripheral surface 210 of the main body. The main body inner peripheral surface 210 has a first main body inner peripheral surface portion 211 to a fifth main body portion inner peripheral surface portion 215. Further, the tip surface 200a of the main body portion is provided on the tip side (left side in FIG. 1) along the axial direction. The first main body inner peripheral surface portion 211 and the second main body inner peripheral surface portion 212 form a space in which the flange 350 of the sleeve 300 is arranged, which will be described later. The third main body inner peripheral surface portion 213 forms a first pressure space 240, a second pressure space 260, and a fluid passage 250 together with the sleeve outer peripheral surface 330, which will be described later. The fourth main body inner peripheral surface portion 214 is a stepped surface and forms a space for arranging the sleeve 300. The fifth main body inner peripheral surface portion 215 forms a tool holding portion inner space together with the sleeve inner space 320.
The inner peripheral surface 210 of the main body forms an inner space 220 of the main body into which the sleeve 300 is inserted. The inner peripheral surface 210 of the main body has a circular shape with the center line P as the center point when viewed in a cross section perpendicular to the axial direction.

The sleeve 300 has a sleeve inner peripheral surface 310 and a sleeve outer peripheral surface 330. Further, the sleeve front end surface 300a is provided on the front end side along the axial direction, and the sleeve rear end surface 300b is provided on the rear end side.
The sleeve inner peripheral surface 310 forms the sleeve inner space 320. The inner peripheral surface 310 of the sleeve has a circular shape with the center line P as the center point when viewed in a cross section perpendicular to the axial direction. In the present embodiment, the tool shank portion of the tool 600 is inserted into the sleeve inner space 320. That is, in the present embodiment, the sleeve inner space 320 is used as a tool insertion space.
The main body portion 200 and the sleeve 300 constitute the "tool holding portion" of the present invention, and the main body portion inner peripheral surface 210 and the sleeve inner peripheral surface 310 form the "tool holding portion inner peripheral surface" of the present invention. The space 220 and the sleeve inner space 320 constitute the "main body inner space" of the present invention.

The outer peripheral surface 330 of the sleeve has a circular shape with the center line P as the center point when viewed in a cross section perpendicular to the axial direction. The sleeve outer peripheral surface 330 has a first sleeve outer peripheral surface portion 331 to a fifth sleeve outer peripheral surface portion 335.
The first sleeve outer peripheral surface portion 331 constitutes the flange 350 together with the sleeve tip surface 330a.
The second sleeve outer peripheral surface portion 332 and the fourth sleeve outer peripheral surface portion 334 are recessed in a stepped shape toward the center line P side from the third sleeve outer peripheral surface portion 333 and the fifth sleeve outer peripheral surface portion 335. It is formed. A first pressure space 240 is formed between the second sleeve outer peripheral surface portion 332 and the main body inner peripheral surface 210, and a second pressure space 240 is formed between the fourth sleeve outer peripheral surface portion 334 and the main body inner peripheral surface 210. A pressure space 260 is formed, and a fluid passage 250 is formed between the third sleeve outer peripheral surface portion 333 and the main body inner peripheral surface 210. The first pressure space 240 and the second pressure space 260 are connected via a fluid passage 250. Further, a thin first grip portion 341 is formed between the second sleeve outer peripheral surface portion 332 and the sleeve inner peripheral surface 310, and between the fourth sleeve outer peripheral surface portion 334 and the sleeve inner peripheral surface 310. A thin-walled second grip portion 342 is formed on the surface.
In the present embodiment, the outer diameter of the flange 350 is formed to be slightly smaller than the inner diameter of the inner peripheral surface portion 211 of the first main body portion, and the outer diameter of the outer peripheral surface portion 335 of the fifth sleeve portion is the inner circumference of the third main body portion. It is formed to be slightly smaller than the inner diameter of the surface portion 213. Then, after the sleeve 300 is inserted into the inner space 220 of the main body, the outer peripheral surface of the flange 350 and the fifth sleeve outer peripheral surface portion 335 are brazed to the inner peripheral surface 210 of the main body. As a result, a highly airtight first pressure space 240, a second pressure space 260, and a fluid passage 250 are formed.

The main body 200 is formed with a fluid passage 270 for injecting a pressure medium into the second pressure space 260. In this embodiment, a liquid such as oil is used as the pressurizing medium. A pressure adjusting device for adjusting the pressure in the first pressure space 240 and the second pressure space 260 is provided.
When the pressure in the first pressure space 240 and the second pressure space 260 rises, the first grip portion 341 and the second grip portion 342 (that is, the first grip portion of the sleeve inner peripheral surface 310). The portion corresponding to the 341 and the second grip portion 342) is elastically deformed toward the center line P, and the inner diameters of the first grip portion 341 and the second grip portion 342 are reduced (reduced in diameter). As a result, the tool shank portion of the tool 600 inserted in the sleeve inner space 320 is gripped by the first grip portion 341 and the second grip portion 342. That is, the tool shank portion of the tool 600 is held (pinched) in the center of the sleeve inner space 320 (tool holding portion inner space).
When the pressure in the first pressure space 240 and the second pressure space 260 decreases, the first grip portion 341 and the second grip portion 342 return to the shape before elastic deformation, and the first grip portion The grip of the tool shank portion by the 341 and the second grip portion 342 is released.

Next, the tool shank portion of the tool 600 (hereinafter, simply referred to as “tool shank portion”) will be described with reference to FIGS. 2, 3, and 4. FIG. 2 is a view of the tool shank portion as viewed from the direction indicated by arrow II in FIG. 1, and FIG. 3 is a view of the tool shank portion as viewed from the direction indicated by arrow III in FIG. It is a figure. Further, FIG. 4 is a diagram illustrating an operation of regulating the rotation phase of the tool shank portion.

The tool shank portion has a notch portion 640 that is open to the tool rear end surface 600b and the tool shank portion outer peripheral surface 630.
A tapered surface (chamfer) 631 is formed on the outer peripheral surface 630 of the tool shank portion at the end portion (between the tool rear end surface 600b) on the tool rear end surface 600b side. In the present embodiment, the difference between the outer diameter of the outer peripheral surface of the tool shank portion 630 and the inner diameter of the inner peripheral surface 310 of the sleeve is set as small as possible within the range in which the tool shank portion can be inserted into the sleeve inner space 320. Therefore, it is difficult to insert the tool shank portion, particularly the tool rear end surface 600b, from the opening of the sleeve inner space 320. By forming the tapered surface 631 on the tool rear end surface 600b side of the tool shank portion outer peripheral surface 630, the work of inserting the tool shank portion (tool rear end surface 600b) into the opening of the sleeve inner space 320 becomes easy.

The notch portion 640 is formed by the notch surface. The notch surface is the tool rear end surface 600b side from the first notch surface 641, the second notch surface 642 arranged on the tip side of the first notch surface 641, and the first notch surface 641. It has a third notched surface 643 arranged on the rear end side).
The first notched surface 641 corresponds to the "first surface" of the present invention, the second notched surface 642 corresponds to the "second surface" of the present invention, and the third notched surface corresponds to the third notched surface. 643 corresponds to the "third aspect" of the present invention.

The first notched surface 641 extends in a direction parallel to the axial direction (including "substantially parallel") and in a direction intersecting the axial direction. In the present embodiment, the first notched surface 641 extends in a direction parallel to the axial direction and a direction perpendicular to the axial direction (including "substantially right angle").
As an embodiment of the notch 640 that opens in the outer peripheral surface of the tool shank portion 630, the notch portion 640 is open in the outer peripheral surface of the tool shank portion 630 on both sides in the direction intersecting the axial direction (direction intersecting the axial direction). A mode in which only one side of the direction intersecting the axial direction is open to the outer peripheral surface of the tool shank portion 630 can be used. In the present embodiment, the notch portion 640 is configured to open to the outer peripheral surface of the tool shank portion 630 on both sides in the direction perpendicular to the axial direction.
The first notched surface 641 is formed by the first side 641a to the fourth side 641d. The first side 641a and the second side 641b extend in a direction perpendicular to the axial direction. The third side 641c and the fourth side 641d are formed on the outer peripheral surface of the tool shank portion 630 and extend in a direction parallel to the axial direction.
Further, as a mode for forming the first cutout surface 641 extending in a direction perpendicular to the axial direction, a mode extending in various directions perpendicular to the axial direction can be used. In the present embodiment, a line indicating the shortest distance between the center line P and the first side 641a or the second side 641b extending in the direction perpendicular to the axial direction forming the first cutout surface 641. However, the aspect in which the extending direction of the first cutout surface 641 is set so as to pass through the center of the first side 641a or the second side 641b is used.
As an embodiment of the notch 640 that opens to the outer peripheral surface of the tool shank portion 630, when only one side in the direction intersecting the axial direction is open to the outer peripheral surface of the tool shank portion 630 is used. , The line indicating the shortest distance between the first side 641a or the second side 641b forming the first cutout surface 641 and the center line P is orthogonal to the first side 641a or the second side 641b. As such, the extending direction of the first cutout surface 641 is set.

The second notch surface 642 arranged on the distal end side of the first notch surface 641 extends in a direction intersecting the extending direction of the first notch surface 641. In the present embodiment, the second notched surface 642 extends in the same direction as the extending direction perpendicular to the axial direction of the first notched surface 641, and the first notched surface 641. , It extends along a direction that is inclined with respect to the extending direction parallel to the axial direction. That is, the cross-sectional area of the notch portion 640 in the direction perpendicular to the axial direction is reduced from the tip end portion (first side 641a) of the first notch surface 641 toward the tip end side. It is postponed. The extending direction of the second cutout surface 642 can be set in various directions including a direction perpendicular to the extending direction of the first cutout surface 641.
The second cutout surface 642 is configured to be able to come into contact with the positioning pin 400, which will be described later, when the tool shank portion is inserted into the tool holding portion inner space (sleeve inner space 320, main body inner space 220). Therefore, it can be used as a stopper for restricting the insertion of the tool shank portion.

The third notch surface 643 arranged on the rear end side of the first notch surface 641 is formed on a tapered surface. In the present embodiment, the third notched surface 643 extends in the same direction as the extending direction perpendicular to the axial direction of the first notched surface 641, and the first notched surface 641. , It extends along a direction that is inclined with respect to the extending direction parallel to the axial direction. That is, the cross-sectional area of the notch portion 640 in the direction orthogonal to the axial direction is large from the rear end side end portion (second side 641b) of the first notch surface 641 toward the tool rear end surface 600b. It is extended to become. The extending direction of the third cutout surface 643 can be appropriately set.
In the present embodiment, the difference between the outer diameter of the outer peripheral surface of the tool shank portion 630 and the inner diameter of the inner peripheral surface of the tool holding portion (sleeve inner peripheral surface 310), and the tool shank portion is the space inside the tool holding portion (sleeve inner space 320, The distance between the first notch surface 641 of the notch portion 640 and the positioning pin outer peripheral surface 410 of the positioning pin 400 described later in the state of being inserted into the inner space 220) of the main body portion makes the tool shank portion a tool. It is set as small as possible within the range that can be inserted into the holding portion inner space (sleeve inner space 320). Therefore, the first notch surface 641 of the notch portion 640 of the tool shank inserted in the tool holding portion inner space (sleeve inner space 320) is arranged in the vicinity of the positioning pin outer peripheral surface 410 of the positioning pin 400. The work is difficult. A tapered third notch surface 643 is formed on the rear end side (insertion side of the tool shank portion) from the first notch surface 641 of the notch portion 640, whereby the positioning pin 400 is further positioned. Since the pin outer peripheral surface 410 has a circular shape, the first notched surface 641 can be easily arranged in the vicinity of the positioning pin outer peripheral surface 410.

The positioning pin 400 extends in the longitudinal direction and is formed as a long member having a positioning pin outer peripheral surface 410 having a circular cross section.
Then, the first cutout surface 641 of the cutout portion 640 of the tool shank portion inserted into the tool holding portion inner space (main body portion inner space 220) is located in the vicinity of the positioning pin outer peripheral surface 410 of the positioning pin 400. The extending direction of the first cutout surface 641 perpendicular to the axial direction is configured to be dispositionable along the extending direction of the outer peripheral surface 410 of the positioning pin. In the present embodiment, the positioning pin 400 is arranged so that the outer peripheral surface 410 of the positioning pin extends in a direction perpendicular to the axial direction.
Since the rotation phase of the tool shank portion changes depending on the distance between the first cutout surface 641 of the tool shank portion and the outer peripheral surface 410 of the positioning pin, the tool shank portion inserted into the space inside the tool holding portion. The first notch surface 641 of the notch portion 640 is configured to be arranged at a position as close as possible to the positioning pin outer peripheral surface 410.
The positioning pin 400 is configured to be able to regulate the rotation of one side and the rotation of the other side around the center line P of the tool shank portion. That is, both when the tool shank portion is rotated to one side around the center line P and when it is rotated to the other side, the first cutout surface 641 is configured to abut on the outer peripheral surface 410 of the positioning pin. For example, the arrangement position and length of the positioning pin outer peripheral surface 410 are appropriately set.
The positioning pin 400 corresponds to the "first rotation restricting member" of the present invention, and the positioning pin outer peripheral surface 410 corresponds to the "rotation restricting surface" of the present invention.

A gap is generated between the first notched surface 641 of the tool shank portion and the outer peripheral surface 410 of the positioning pin. The ball plunger 500 is provided to prevent variations in the rotational phase of the tool shank portion due to a gap between the first notched surface 641 and the outer peripheral surface 410 of the positioning pin.
The ball plunger 500 has a spring 510 and a ball 520 elastically supported by the spring 510. The amount of protrusion of the ball 510 can be adjusted.
The ball plunger 500 is arranged on one side of the positioning pin 400 along the extending direction of the outer peripheral surface 410 of the positioning pin. In the present embodiment, the first cutout surface 641 is arranged on the third side 641c side. Further, the first notched surface 641 of the tool shank inserted into the inner space of the tool holding portion is in the vicinity of the outer peripheral surface 410 of the positioning pin, and the extending direction of the first notched surface 641 perpendicular to the axial direction. However, in a state where the ball 520 is arranged along the extending direction of the outer peripheral surface 410 of the positioning pin, the ball 520 abuts on the first notched surface 641 and is arranged so that the tool shank portion can be pressed. The contact point of the ball 520 with the first cutout surface 641 is set to a place where the pressing force of the ball 520 acts as a rotational force around the center line P of the tool shank portion.
When the tool shank portion is rotated around the center line P by the pressing force of the ball 520, the fourth side 641d of the first cutout surface 641 comes into contact with the outer peripheral surface 410 of the positioning pin. As a result, the tool shank portion is fixed at a position where the first notched surface 641 abuts on the outer peripheral surface 410 of the positioning pin. That is, the rotation phase of the tool shank portion is uniformly defined.
The ball plunger 500 corresponds to the "second rotation restricting member" of the present invention, and the outer peripheral surface of the ball 520 corresponds to the "contact surface" of the present invention.

Next, the operation of the tool holding device of the present invention will be described with reference to FIGS. 4 to 6. FIG. 5 is a diagram showing a state in which the tool shank portion is inserted into the space inside the tool holding portion, and FIG. 6 is a diagram showing a first cutout surface 641 of the tool shank portion inserted into the space inside the tool holding portion. It is a figure which shows the state which came into contact with the outer peripheral surface 410 of a positioning pin.
First, as shown in FIG. 4A, the tool rear end surface 600b of the tool shank portion is positioned at the opening of the tool holding portion inner space (sleeve inner space 320).
Next, as shown in FIG. 4B, the tool shank portion is inserted into the tool holding portion inner space (sleeve inner space 320).
Then, as shown in FIGS. 4C and 5, the first notch surface 641 of the notch portion 640 of the tool shank portion is located in the vicinity of the positioning pin outer peripheral surface 410 of the positioning pin 400. The extending direction (the extending direction of the first side 641a and the second side 641b) perpendicular to the axial direction of the notch surface 641 of 1 is along the extending direction (longitudinal direction) of the outer peripheral surface 410 of the positioning pin. Arrange the tool shank so that it is arranged.
The center line of the tool shank portion so that the extending direction of the first cutout surface 641 perpendicular to the axial direction is arranged along the extending direction (longitudinal direction) of the outer peripheral surface 410 of the positioning pin. It is necessary to adjust the position around P. The position of the tool shank portion around the center line P may be adjusted by the operator when the tool rear end surface 600b is inserted into the opening of the tool holding portion inner space or in the tool holding portion inner space. Alternatively, a rotation position adjusting member may be provided so as to be automatically adjusted.
In the state shown in FIGS. 4 (c) and 5, a minute gap is generated between the first notched surface 641 and the outer peripheral surface of the positioning pin 410. If the gap between the first notched surface 641 and the outer peripheral surface of the positioning pin 410 is small and the variation in the rotational phase of the tool shank due to this gap is small, machining can be performed in this state. ..

On the other hand, when the gap between the first cutout surface 641 and the outer peripheral surface of the positioning pin 410 is large and the rotation phase of the tool shank portion fluctuates greatly due to this gap, the ball plunger 500 is used.
In FIG. 5, the ball 520 of the ball plunger 500 is in the standby position.
Then, as shown in FIG. 6, in a state where the tool shank portion is inserted into the space inside the tool holding portion, the ball 520 of the ball plunger 500 is extruded (moved to the operating position), and the outer peripheral surface of the ball 520 is pushed out. Is in contact with the first notched surface 641. As a result, the portion of the first cutout surface 641 on the third side 641c side is pressed in the direction indicated by the arrow, and the tool shank portion is indicated by the arrow around the center line P. Rotate in the direction. As the tool shank portion rotates, the fourth side 641d of the first notched surface 641 comes into contact with the outer peripheral surface 410 of the positioning pin. Since the ball 520 is elastically supported by the spring 510, the contact state between the fourth side 641d of the first notched surface 641 and the outer peripheral surface 410 of the positioning pin is maintained.
In this way, by bringing the first cutout surface 641 into contact with the outer peripheral surface 410 of the positioning pin, the rotation phase of the tool shank portion can always be set to be constant regardless of the type of cutting edge. Therefore, it is possible to reliably prevent a decrease in machining accuracy due to variations in the mounting phase of the tool.

In the above-described embodiment, with the ball 520 of the ball plunger 500 placed in the standby position, the cutout portion 640 of the tool shank portion is inserted into the space inside the tool holding portion (FIG. 5), and then the ball plunger 500 is provided. The ball 520 is moved to the operating position to bring the ball 520 into contact with the first cutout surface 641 of the cutout portion 640 (FIG. 6).
However, the timing at which the ball 520 of the ball plunger 500 is brought into contact with the first notched surface 641 can be appropriately changed.
In another embodiment, with the ball 520 of the ball plunger 500 arranged at the operating position shown in FIG. 6, the notch portion 640 of the tool shank portion is inserted into the space inside the tool holding portion. When the notch portion 640 of the tool shank portion is inserted into the space inside the tool holding portion, the ball 520 of the ball plunger 500 is guided by the third notch surface 643 formed as a tapered surface and is first. It is arranged at the position of the cutout surface 641 of. As a result, the portion of the first cutout surface 641 on the third side 641c side is pressed by the ball 520, and the tool shank portion rotates around the center line P. Then, as described above, the tool shank portion rotates around the center line P, so that the fourth side 641d of the first cutout surface 641 comes into contact with the positioning pin outer peripheral surface 410. As described above, it is preferable that the insertion operation of the tool shank portion is regulated by a stopper having an appropriate configuration.
In the present embodiment, only the operation of inserting the tool shank portion into the space inside the tool holding portion reliably prevents the variation in the rotation phase of the tool shank portion, that is, the decrease in machining accuracy due to the variation in the mounting phase of the tool. be able to.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
The cutout portion of the tool shank portion may be opened to the rear end surface of the tool, and as a mode of opening to the outer peripheral surface of the tool shank portion, the outer peripheral surface of the tool shank portion is opened on both sides in the direction parallel to the axial direction and the direction intersecting the axial direction. It is possible to use a mode of opening to the outer peripheral surface of the tool shank portion only on one side in a direction parallel to the axial direction and a direction intersecting the axial direction.
The first cutout surface (first surface) constituting the notch portion of the tool shank portion is a first side or a first side extending in a direction perpendicular to the axial direction forming the first notch surface. A line indicating the shortest distance between the two sides and the center line is formed to pass through the center of the first side or the second side, but simply intersects the direction parallel to the axial direction and the axial direction. It can also be formed to extend in the direction.
The second notch surface (second surface) constituting the notch portion of the tool shank portion is a direction perpendicular to the extending direction of the first notch surface (first surface) or the first cut. It extends in a direction intersecting the extending direction of the first notched surface (first surface), including a direction inclined with respect to a direction perpendicular to the extending direction of the notched surface (first surface). Just do it.
At least one of the second cutout surface (second surface) and the third notch surface (third surface) constituting the notch portion of the tool shank portion can be omitted.
The tapered surface on the rear end surface side of the tool on the outer peripheral surface of the tool can be omitted.
As the first rotation regulating member for preventing the variation of the rotation phase of the tool shank portion (tool), the outer peripheral surface of the positioning pin to which the first cutout surface (first surface) of the tool shank portion can come into contact is provided. Although the positioning pin provided is used, as the first rotation regulating member, it is sufficient that the variation in the rotation phase of the tool shank portion can be prevented, and rotation regulating members having various configurations having various shapes of rotation regulating surfaces are used. be able to.
A ball that is elastically supported as a second rotation regulating member for preventing variation in the rotation phase of the tool shank portion (tool) and can come into contact with the first notched surface (first surface) of the tool shank portion. However, as the second rotation restricting member, it is sufficient that a rotational force can be applied to the tool shank portion, and rotation restricting members having various configurations can be used.
Although the first rotation regulating member and the second rotation regulating member are provided, the second rotation regulating member may be omitted and only the first rotation regulating member may be provided.
Each configuration described in the embodiment can be used alone or in combination of a plurality of configurations selected as appropriate.

100 Tool holder 200 Main body 200a Main body tip surface 210 Main body inner peripheral surface 211 First main body inner peripheral surface portion 212 Second main body inner peripheral surface portion 213 Third main body inner peripheral surface portion 214 Fourth main body inner peripheral Surface portion 215 Fifth main body inner peripheral surface portion 220 Main body inner space 240 First pressurized space 250 Fluid passage 260 Second pressurized space 270 Fluid passage 300 Sleeve 300a Sleeve tip surface 300b Sleeve rear end surface 310 Sleeve inner circumference Surface 330 Sleeve outer peripheral surface 331 First sleeve outer peripheral surface portion 332 Second sleeve outer peripheral surface portion 333 Third sleeve outer peripheral surface portion 334 Fourth sleeve outer peripheral surface portion 335 Fifth sleeve outer peripheral surface portion 341 First grip portion 342 Second grip portion 350 Flange 400 Positioning pin (first rotation restricting member)
410 Positioning pin outer peripheral surface (rotation control surface)
500 ball plunger (second rotation control member)
510 Spring 520 Ball 600 Tool 600b Tool rear end surface 630 Tool shank outer peripheral surface 631 Chamfering (tapered surface)
640 Notch 641 First notch surface (second surface)
642 Second notch surface (first surface)
643 Third notched surface (third surface)
643a First side 643b Second side 643c Third side 643d Fourth side

Claims (4)

A tool that extends along the axial direction, has a blade on the tip side, and has a tool shank portion having a tool rear end surface and a tool shank portion outer peripheral surface on the rear end side, and the tool shank portion are inserted. A tool holding portion having an inner peripheral surface of the tool holding portion forming a possible inner space of the tool holding portion extending along the axial direction is provided, and the tool shank portion inserted into the inner space of the tool holding portion is held. It is a tool holding device
The tool shank portion is open to the rear end surface of the tool and the outer peripheral surface of the tool shank portion, and has a notch portion formed by the notch surface, and the notch surface is parallel to the axial direction. It has a first surface that extends in a direction and in a direction intersecting the axial direction.
A holding mechanism that holds the tool shank in the center of the inner space of the tool holding portion by bringing at least a part of the inner peripheral surface of the tool holding portion into contact with the outer peripheral surface of the tool shank portion.
A first rotation regulating member and a second rotation regulating member that regulate the rotation of the tool shank portion are provided.
The first rotation regulating member has a rotation regulating surface and has a rotation regulating surface.
The first surface of the tool shank inserted into the space inside the tool holding portion intersects the axial direction of the first surface in the vicinity of the rotation restricting surface of the first rotation restricting member. The extending direction is configured to be arrangable so as to be arranged along the extending direction of the rotation restricting surface.
The second rotation restricting member has a contact surface, and is arranged on one side of the rotation restricting surface along the extending direction with respect to the first rotation restricting member.
In the second rotation restricting member, the first surface of the tool shank inserted into the space inside the tool holding portion is located in the vicinity of the rotation restricting surface of the first rotation restricting member. In a state where the extending direction of the surface intersecting the axial direction is arranged along the extending direction of the rotation restricting surface, the contact surface is configured to be able to contact the first surface. A tool holding device characterized by being The tool holding device according to claim 1 .
The tool holding portion is composed of a main body portion and a sleeve.
The main body portion has an inner peripheral surface of the main body portion that forms an inner space of the main body portion.
The sleeve has an outer peripheral surface of the sleeve and an inner peripheral surface of the sleeve forming the inner space of the sleeve, and is arranged in a part of the inner space of the main body portion.
The tool holding device is characterized in that the inner peripheral surface of the tool holding portion is formed by the inner peripheral surface of the main body portion and the inner peripheral surface of the sleeve. The tool holding device according to claim 1 or 2 .
The notched surface has a second surface formed between an end portion on the tip end side of the first surface and the outer peripheral surface of the tool, and the second surface is the first surface. A tool holding device characterized in that it extends in a direction intersecting the extending direction of the surface. The tool holding device according to any one of claims 1 to 3 .
The notched surface has a third surface of the first surface formed between the rear end side end surface and the tool rear end surface, and the third surface is the notched portion. The cross-sectional area of the first surface extends in a direction intersecting the extending direction of the first surface so as to increase from the end portion on the rear end side of the first surface toward the rear end surface of the tool. A tool holding device characterized by being present.

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