JP2001310206A - Tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust projecting quantity of a head end of a tool 4 speedily in a state of maintaining a whirl-stop function of a blade even when the projecting quantity of the blade is increased by continuously engaging an engagement part 29 of a whirl-stop member with an engagement part of a root part 4a of the tool by retreating the built-in whirl-stop member 6c together by quick insertion and extraction of the tool 4 in the case of adjusting the projecting quantity of the head end of the tool 4 against a main body 1 of a tool holder. SOLUTION: A whirl stop-means arranged at a deeper position than an insertion hole on the tool holder is constituted of the whirl stop member stored free to advance and retreat in the shaft center direction against a hole to store the whirl-stop member and impossible to move in the revolving direction, the engagement part provided on the whirl-stop member and a spring material to energize the whirl-stop member in one direction so as to connect it to a corresponding hooking part provided on the tool root part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder used for attaching various tools such as a drill to a main shaft of a machine tool.

[0002]

2. Description of the Related Art FIG. 4A shows an example of a tool holder which has been widely known (see, for example, Japanese Utility Model Laid-Open No. 2-19412). In FIG. 4A,
Reference numeral 1 denotes a main body of the tool holder, which is formed of a highly rigid metal material in a hollow cylindrical shape. Reference numeral 2 denotes a connecting portion provided at one end of the main body 1, which is a portion for connecting to a main shaft of a machine tool. Reference numeral 3 denotes an insertion hole provided in the main shaft member 1a of the main body 1,
It is for inserting a base part 4a of a tool 4 which is an arbitrary tool such as a drill, and has an opening 3a on the other end face of the main body as shown in the figure. Reference numeral 5 denotes a fastener attached to the other end of the main body 1. Reference numeral 6 denotes a receiving member provided in the insertion hole 3.
As the fastener 5, a well-known collet chuck is shown as an example. That is, reference numeral 11 denotes a collet whose outer peripheral surface is formed in a tapered shape having a small diameter at the base and a large diameter at the tip, and formed in the insertion hole 3 in a tapered shape corresponding to the vicinity of the opening end thereof. It is inserted into the insertion hole 12. The inner peripheral surface 13 of the collet 11 is a tool tightening surface. As is well known, the collet 11 has a slit 14 from its front end and a slit from its rear end.
15 are formed to facilitate diameter reduction. Fastener 5
An engaging member 17 that engages with the collet 11 and a sphere
It comprises a rotating ring 19 which is relatively rotatable via 18 and is connected so as to be integrated in the axial direction. The rotating ring 19 is the main body 1
When the screw is rotated and advanced in the direction of arrow 16, the collet 11 sinks via the engaging member 17 and fastens the base 4 a of the tool.

[0003] Next, reference numeral 20 denotes a base material of the receiving member 6, which is also referred to as a preset screw.
Is screwed into a female screw 3a formed on the inner peripheral surface of the insertion hole 3. Reference numeral 21 denotes an operation unit provided at the axial center of the substrate 20, which is formed in a hexagonal hole. The shape of the operation unit 21 may be another shape corresponding to the operation tool 26 described later. Reference numeral 22 denotes an elastic body, which is formed in an annular shape using a rubber material as an example. The elastic body 22 may be made of metal such as a disc spring. Reference numeral 23 denotes a plate made of a hard material, for example, a metal (a hard resin is also acceptable), and the elastic body 22 is attached (for example, fixed with an adhesive) to a concave portion formed on one surface thereof. 3
Reference numerals 0 and 31 denote a well-known flange and a chuck groove formed therein.

A method of using the tool holder having the above configuration will be described. First, the base 4a of the tool 4 is inserted into the insertion hole 3 through the collet 11 until the rear end 4b of the tool 4 comes into contact with the contact plate 23 of the receiving member 6. Next, as shown in FIG. 4 (A), an arbitrary turning operation tool 26 inserted into the main body 1 is inserted into the operation portion 21 and the base material 20 is turned by turning the base material 20 in the axial direction of the insertion hole 3. The tool 4 is moved and the tool 4 is moved in and out so that the cutting edge 4c comes to a predetermined position. Next, the rotating ring 19 of the fastener 5 is turned to rotate the collet 11.
To the deep portion of the collet insertion hole 12. Then collet 11
Is reduced in diameter, and the base portion 4a of the tool 4 is fastened by the inner peripheral surface 13. When the collet 11 is further advanced to the deep part of the collet insertion hole 12 after the inner peripheral surface 13 is pressed against the base part 4a, the base part 4a of the tool 4 also sinks toward the deep part of the insertion hole 3 integrally with the collet 11. Embed

[0005] Even if there is such sinking, the sinking is allowed by the compression of the elastic body 22. Therefore, the base 4a is prevented from bending between the collet 11 and the receiving member 6. When the elastic body 22 is compressed due to the sinking of the base part 4a, the force for compressing the elastic body 22 is dispersed throughout the elastic body 22 by the contact plate 23. Therefore, the elastic body 22 is hardly damaged. In addition, the gap G between the base material 20 and the contact plate 23 in FIG.
It is preferable to set the gap between the substrate 20 and the plate 23 after the compression as small as possible. When the tool 4 is attached to the tool holder as described above, the connecting portion 2 of the tool holder is connected to the main shaft of the machine tool in a known manner. This achieves the mounting of the tool on the machine tool.

FIG. 4B shows that the receiving member 6 of FIG. 4A has a tool driver 28 having a concave groove as an engaging portion, and the tool driver 28 forms the contact plate 23. This is an example. In FIG. 4B,
The cross-sectional shape of the insertion hole 3 in the main body 1 is formed as a regular hexagon by forming a groove 3b as an example of a non-circular shape. The outer shape of the tool driver 28 is formed in a non-circular shape, that is, a regular hexagon corresponding to the cross-sectional shape of the insertion hole.
Therefore, the tool driver 28 can freely advance and retreat in the axial direction of the insertion hole 3 with respect to the main body 1, and is in a state of being immobile because relative rotation with respect to the main body 1 is prevented. Reference numeral 29 denotes a fitting groove formed in the tool driver 28.
This is for fitting a protruding piece-shaped engaging portion (4d in FIG. 1) provided at the rear end of the device.

[0007] In the above-mentioned configuration, in the case of processing a workpiece, the turning power of the main body 1 is transmitted from a tool driver 28 which rotates integrally with the main body 1 to an engaging portion (fitting) fitted into a fitting groove 29. FIG.
4d) is also transmitted to the tool 4. Therefore, even in a situation where a slip may occur between the collet 11 and the base part 4a (for example, when the cutting resistance of the workpiece by the tool is large), the turning power of the main body 1 is not reduced by the engagement of the tool driver 28. It is reliably transmitted to the base part 4a via the mating groove and the engaging part. In FIG. B, portions that are functionally considered to be the same as or equivalent to those in FIG. 4A are denoted by the same reference numerals as in the previous diagram, and redundant description is omitted.

[0008]

In this conventional tool holder, when adjusting the insertion and exit dimensions of the tool 4 with respect to the insertion opening 3 of the main body 1, the base member 20 of the receiving member 6 is turned to adjust the contact plate 23.
By moving back and forth, the tool base 4a can be moved back and forth to achieve its purpose. In addition, if the pitch of the external thread 20a of the base member 20 in the receiving member 6 is small, there is an advantage that the amount of advance and retreat of the contact plate 23 can be finely adjusted. However, on the other hand, when it is desired to change the inflow and outflow dimensions of the tool 4 significantly and quickly, the base material 20 in the receiving device must be turned several times, and there is a problem that time is wasted in adjusting the forward / backward movement. Was.
It is also conceivable to eliminate the base member 20 and the abutment plate 23 (or the tool driver 28) in the receiving member 6, but if this is done, the base portion 4a of the tool cannot be received or detented, and the fastener 5 alone is uneasy and reliable. The problem which lacks in nature arises. Further, when adjusting the in-and-out dimension of the tool 4, for example, even if an attempt is made to use a well-known preset gauge (see FIG.
There was also a problem that it was difficult to use because 6 could not be inserted.

[0009] The tool holder of the present application is provided to solve the above-mentioned problems of the prior art. An object of the present application is to adjust the amount of protrusion of the tip of the tool 4 with respect to the main body 1 so that the detent member 6c is moved forward and backward together by inserting and removing the tool 4, and the detent member is inserted into the engagement portion of the base part 4a of the tool. An object of the present invention is to provide a tool holder capable of keeping the engagement of the engagement portion 29 of FIG. 6c continuously and completely stopping the rotation of the blade regardless of whether the protrusion amount of the blade is large or small. . Another purpose is to use the tool 4
When adjusting the amount of protrusion of the tip of the blade, even if it is desired to change the amount of protrusion of the blade significantly and instantaneously, the detent member is always interlocked with the operation of inserting and removing the blade edge, and the operation of inserting and removing the tool 4 can be performed in a short time. An object of the present invention is to provide a tool holder that can be used. Another object is to adjust the amount of protrusion of the tip of the tool 4 with respect to the main body 1 by suddenly or slightly loosening the set screw so that a large or small amount of the blade edge can be projected from the main body 1. It is intended to provide a holder. Another purpose is to adjust the in-out dimension of the cutting edge and then tighten it with the fastener 5 to restrict the movement in the axial direction. An object of the present invention is to provide a tool holder that prevents a tool from moving forward and backward using a rotation preventing member.
Other objects and advantages will be more readily apparent from the drawings and the following description associated therewith.

[00010]

The tool holder according to the present invention has a connecting portion to a machine tool at one end and an insertion hole for inserting a base portion of a tool having an opening at an end surface at the other end. In the tool holder, the opening is provided with a fastener for fastening and fixing the base of the tool inserted into the insertion hole, wherein the base of the tool is located deeper than the insertion hole. A detent means is disposed, and the detent means is constituted by a detent member storage hole communicating with the insertion hole, and is capable of moving back and forth in the axial direction with respect to the hole and immovable in the rotational direction. The engagement portion between the rotation preventing member accommodated in the state and the tool base provided on the tool base side of the rotation preventing member is joined to the corresponding engaging portion provided on the tool base. And a spring material for urging the detent member in one direction The is intended.

[00011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. In the tool holder shown in FIGS. 1, 2 and 3, the functions, properties, features, and the like of the components, members and the like denoted by the same reference numerals as those of the tool holder shown in FIG.
Except for the new members, configurations, combinations, and the like, of the present invention described below, they can be understood to be the same as those described above, and thus redundant description will be omitted below.

The illustrated tool holder has a connecting portion 2 for a machine tool at one end, and an insertion hole 3 for inserting a base portion of a tool having an opening 3a at an end surface as shown in the drawing. is there. The opening 3a is provided with a well-known optional fastener 5 for fastening and fixing the base 4a of the tool inserted into the insertion hole. At a position deeper than the insertion hole 3, a detent means 6 'for the base part 4a of the tool is arranged. The structure of the detent means 6 'is the same as that of the insertion hole 3
And a detent member 6c which is movable in the axial direction with respect to the hole 6a and is immovable in the rotational direction. This hole 6
The relationship between a and the detent member 6c is that the inner periphery of the hole 6a is formed in a non-circular shape, for example, a hexagon as shown, while the outer shape 6b of the detent member 6c is formed in a corresponding hexagon. Thus, the above function is exerted.

The engagement portion 29 of the rotation preventing member 6c with the tool base provided on the tool base side is formed in a concave (convex) shape, and is provided on the tool base 4a. By joining to the convex (concave) engaging portion 4d, it is integrated into one body in the rotational direction. Further, a hole 7a for accommodating a spring is provided inside the main shaft member 1a, and a spring seat 7c and a spring abutment located at the rear end of the detent member 6c for urging the detent member 6c in one direction. A spring material 7b in the form of a wound spring is provided between the spring member 7b and the spring member 7f. 10a and 10b
Indicates a female screw hole and a push screw which can be moved forward and backward with respect to the hole. The forward and backward movement of the rotation preventing member 6c can be restrained by rotating the push screw 10b to advance the screw. Therefore, when the push screw 10b is pushed forward from the outer periphery of the main body toward the detent member 6c, the movement of the tool 4 in the reciprocating direction is added to the fixing by the fastener 5, and the detent member 6 is moved.
The fixing force is also increased by fixing c with the set screw 10b. Reference numeral 9 indicates the presence of a well-known through hole for allowing a coolant to flow through the center of the tool body.

Next, a part of the peripheral wall of the detent member 6c shown in FIG. 3 is provided with an elongated groove 30 extending in the axial direction. The depth of the long groove 30 is formed so that the base side 30a of the tool becomes deep and the side 30b of the spring material 7b becomes shallow. On the other hand, a female screw hole 31a is provided from the outer wall of the main body 1a toward the long groove 30. The female screw hole 31a is provided with an adjusting screw 31 which can freely advance and retreat toward the long groove. The amount of movement (in the direction of the arrow 16a) of the detent member 6c urged in one direction by the force of the member 7b toward the tool base portion can be determined. The shape of the peripheral wall of the detent member 6c shown in FIG. 3 is formed in a perfect circle, and the periphery of the inside of the hole is also formed in a corresponding perfect circle. It may rotate freely. In order to prevent this and to provide a non-round function, a groove 32 is formed in FIG. 3 so that the tip of the push screw 10b faces the groove 32 to prevent the rotation of the detent member 6c. Further, in FIG. 3, portions that are considered to have the same or equivalent configuration and functions as those of the above-described respective drawings in function are denoted by the same reference numerals as those in the above-described respective drawings, and redundant description is omitted.

A method of using the configuration shown in FIG. 1 will be described. First, in the preparatory step, the connecting portion 2 is generally set to a stationary position with respect to a well-known preset gauge or an arbitrary jig with the connecting portion 2 facing downward. Next, the turning ring 19 of the fastener 5 is turned to loosen the collet 11, and the opening 3a is opened. Next, the work of adjusting the insertion and removal of the tool 4 is performed. First, insert the base of the tool into the hole 3 and turn it around to turn it.
Is engaged with the engaging portion 4d of the tool. Next, the tool is pushed in by a predetermined amount. In this case, the spring 7b
Has a sufficient urging force to lift the detent member 6c and the tool 4, so that the force is slightly increased.

When the ingress and egress dimensions from the main body 1 to the tool tip 4c are determined using the above-mentioned preset gauge or the dimension measurement function of an arbitrary jig (such as a ruler), the turning ring 19 of the fastener 5 is turned. Tighten the base of the tool. When adjusting the in-and-out dimension of the tool, the detent member 6c is configured to be able to advance and retreat, so that the detent member 6c compresses or shrinks the spring even if the tool is quickly pushed in or the tool is quickly raised. It has the feature of responding to rapid advance and retreat by being lifted by the urging force. Finally, the push screw 10b is turned to restrain the rotation preventing member 6c from moving back and forth.

Next, when adjusting the tool 4 in and out of the tool holder shown in FIG. 3, the push screw 31 is retracted, and the push screw 10b is also retracted slightly so as not to fall out of the long groove 32. . Next, the insertion and removal dimensions of the tool 4 are adjusted in the same manner as in the case of the tool holder shown in FIG. In this case, when the set screw 31 is retreated little by little in the state shown in FIG. 3A, the long groove 30 is inclined, so that the detent member 6c is
Push up. Fine tuning is very convenient. When the adjustment of the in / out dimension of the tool 4 is determined, the turning ring 19 of the fastener 5 is turned to fasten and fix the base of the tool. Further, the push screw 10b is turned to restrain the rotation preventing member 6c from moving forward and backward.

[0018]

As described above, according to the present invention, when the amount of protrusion of the tip of the tool 4 with respect to the main body 1 is adjusted, the detent member 6c is moved forward and backward together by taking the tool 4 in and out, so that the base 4a of the tool can be adjusted. Even when the engaging portion 29 of the rotation preventing member can be kept engaged with the engaging portion 4d, and the amount of protrusion of the cutting edge is to be greatly and instantaneously changed, the rotation preventing member 6c is always used for the operation of inserting and removing the cutting edge. Are interlocked, and there is an effect that the operation of moving the blade edge 4 can be performed in a short time.

After adjusting the in-and-out dimension of the cutting edge, the base of the tool is tightened with the fastener 5 to restrict the movement in the axial direction. In the present invention, however, the tool is freely movable in the reciprocating direction. By restricting the rotation preventing member 6c with a push screw, the tool can be prevented from moving forward and backward.

Further, when adjusting the amount of protrusion of the tip of the tool 4 with respect to the main body 1, a large amount of cutting edges can be obtained from the main body 1 by loosening the set screw 31 shown in FIG.
Alternatively, there is an effect that a small amount can be projected.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view.

FIG. 2 is a sectional view taken along line A-A 'in FIG.

3A is a longitudinal sectional view of a main part, and FIG. 3B is a sectional view taken along line BB ′.

4A is a longitudinal sectional view showing a conventional example, and FIG. 4B is an exploded perspective view showing a conventional detent member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Connection part, 3 ... Insertion hole, 4 ...
..Tools, 5 ... fasteners, 6 '... detent means, 7
b ... Spring member

Claims (3)

[Claims] An end is provided with a connecting portion to a machine tool, and the other end is provided with an insertion hole for inserting a base portion of a tool having an opening at an end face, and the opening is inserted into the insertion hole. In a tool holder provided with a fastener for tightening and fixing a base portion of the tool, a detent means for a base portion of the tool is disposed at a position deeper than the insertion hole, and the detent is provided. The configuration of the means includes a rotation-stopping member housing hole communicating with the insertion hole, a rotation-stopping member that is movable back and forth in the axial direction with respect to the hole and is immovable in the rotation direction, In order to urge the detent member in one direction so that the engaging portion of the stop member with the tool base provided on the tool base side is joined to the corresponding engaging portion provided on the tool base. A tool holder comprising: a spring material; 2. A part of the peripheral wall of the detent member is provided with a long groove extending in the axial direction, and the long groove is formed so that the base side of the tool is deeper, while the outer groove of the main body is formed. By providing an adjusting screw that is movable back and forth toward the long groove, the amount of movement of the detent member urged in one direction to the tool base side can be determined by the advancing and retracting operation of the adjusting screw. The tool holder according to claim 1, wherein: 3. A push screw is provided so as to be able to move forward and backward from the outer periphery of the main body toward the detent member. In addition to the movement of the tool in the advance and retreat direction by the above-mentioned fastener, the detent member is fixed by the push screw. The tool holder according to claim 1 or 2, wherein the fixing force is increased also by (1).