JPS6240739Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a holder for mounting a rotary cutting tool such as a side milling cutter or a face milling cutter to the main shaft of a machine such as a milling machine.

Conventionally, this type of holder is shown in Figures 1 and 2.
As shown in the figure, a tool holder 2 is fixed to the tip of the machine spindle 1 with a bolt 3.
A rotary cutting tool 4 such as a side milling cutter is fitted into the tip of the tool holder 2, and the cutting tool 4 is prevented from rotating relative to the tool holder 2 by the key 5, and then screwed into the threaded end 6 of the tool holder 2. The cutting tool 4 is attached to the tool holder 2 by the bolt 7 via the washer 8.
There are known configurations in which it is fixed to Note that the reference numeral 9 in FIG. 1 is a cutting edge tip.

However, in the above conventional holder, the cutting tool 4
In order to attach and detach the tool to and from the tool holder 2, the nut 7 and washer 8 have to be pulled out one by one, so the speed of attachment and detachment work is poor, and as a result, the time when the tool is not directly used for cutting operations, that is, the idle time becomes longer. However, there was a problem with the operating rate decreasing.

In addition, a cutting tool that allows the cutter to be attached and detached without removing the bolt was developed in 1982.
11025. In this method, a collar provided with an engaging protrusion is integrated with the bolt in the axial direction and is non-rotatably connected to the arbor, and the cutter is provided with a flange with which the engaging protrusion engages, and the cutter is provided with a flange that engages with the engagement protrusion. A pin and an arc-shaped groove are provided between the flange and the arbor so that the cutter can rotate between a position where the engaging protrusion is removed from the flange and a position where the engaging protrusion engages. Therefore, in this cutting tool, by loosening the bolt, the collar retreats in the axial direction to release the pressure on the cutter, and then the cutter is rotated to the limit position allowed by the pin and the arcuate groove. , the engagement protrusion comes off the flange, allowing the cutter to be removed. However, since the cutter is generally heavy, rotating the cutter when attaching and detaching it not only requires a lot of effort but also poses a problem of lack of speed.

This invention was made to solve the above problem, and the purpose is to provide a rotary cutting tool holder that can quickly and easily attach and detach the rotary cutting tool. By rotating the clamp washer, the clamp washer is moved in the axial direction and rotated by a predetermined angle, and as a result, the rotary cutting tool can be attached and detached without rotating it. A tool holder is fixed to the tip of the machine spindle, a rotary cutting tool is fitted to the outer periphery of the tip of the tool holder, and a clamp bolt is screwed into the center of the tip surface of the tool holder, Further, in a rotary cutting tool holder in which a clamp washer fitted to the bolt is disposed between the head of the bolt and the rotary cutting tool, the rotary cutting tool has a penetrating bolt that extends from the front end surface to the rear end surface of the rotary cutting tool. A through groove is formed in the radial direction from the attachment hole for the tool holder, and the clamp washer has a protrusion that loosely fits in the through groove. A friction member is provided between the bolts and the clamp washer, and a friction member is formed between the bolt and the clamp washer, and provides a frictional resistance against relative rotation between the bolt and the clamp washer. A pin is provided that is integrated in the axial direction, and further restricts the rotation of the clamp washer relative to the tool holder within a range between a position where the protrusion coincides with the through groove of the rotary cutting tool and a position where the protrusion does not coincide with the through groove of the rotary cutting tool. The present invention is characterized in that an arcuate long groove into which the pin is inserted is provided on the tip surface of the tool holder and the clamp washer.

An embodiment of this invention will be described below with reference to FIGS. 3 to 5. FIG. 3 is a sectional view showing an embodiment of this invention, in which the tool holder 10 is located at the tip of the machine main shaft 11. A mounting shaft portion 10a is formed at the tip of the tool holder 10 into which a rotary cutting tool 13 such as a side milling cutter is fitted, and a clamping bolt is provided at the center of the tip surface. 14 is screwed in. The cutting tool 13 fitted into the mounting shaft portion 10a has a plurality of cutting tips 15 on the outer periphery, and the cutting tool 13 has a drive key disposed between them with respect to the tool holder 10. Alternatively, the cutting tool 13 is prevented from rotating by a locking device 16 such as a pin, and the central boss portion of the cutting tool 13 has a plurality of (three locations in the figure) through grooves 13 that penetrate from the front end surface to the rear end surface.
a is formed in the radial direction from the attachment hole 13b for the tool holder 10.

A clamp washer 17 for fixing the cutting tool 13 to the tool holder 10 is fitted into a clamp bolt 14 screwed into the center of the tip surface of the tool holder 10 . This clamp washer 17 is attached to the mounting hole 13 of the cutting tool 13.
A base portion 17a having a diameter slightly smaller than b, and a cutting tool 13
A protrusion 17 formed radially from the base portion 17a to match the through groove 13a in
b, and this washer 17 has a friction ring 1 such as a rubber O-ring disposed on its inner circumferential side.
8 is fitted into the bolt 14 so that a predetermined frictional force is generated between the washer 17 and the bolt 14. Therefore, when no external force is applied, the washer 17 rotates together with the bolt 14, and the frictional force is When the rotation preventing force above acts, only the bolt 14 rotates. Further, a retaining ring 19 is attached to the clamping bolt 14, and the retaining ring 19 prevents the washer 17 from coming off, and also brings the washer 17 into substantially close contact with the head of the bolt 14.

On the other hand, two long and short pins 20 and 21 are protruded from two symmetrical locations on the tip surface of the tool holder 10 with respect to the center thereof, and the washer 17
An arc-shaped long groove 22 that fits the long pin 20 of the two pins 20 and 21, and a small hole 23 that fits the short pin 21 are formed on the end surface of the base portion 17a. That is, the long pin 20 and the long groove 22 are connected to the protrusion 17b and the through groove 13.
Define a position where a matches and a position where both do not match, and only between these positions is the washer 1
7, and therefore, when the protrusion 17b and the through groove 13a are aligned,
When the long pin 20 is located at one end of the long groove 22 and the protrusion 17b and the through groove 13a are relatively shifted and do not match, the long pin 20 is located at the other end of the long groove 22. ing. Further, the short pin 21 and the small hole 23 prevent the washer 17 from rotating until the washer 17 is separated from the cutting tool 13 by a predetermined distance, and the protrusion 17b and the through groove 13a are in a mismatched state. When, short pin 21
and the small hole 23 are adapted to fit together.

Next, the operation of attaching and detaching the cutting tool 13 to the holder configured as described above will be explained. First, the operation for removing the cutting tool 13 will be explained. When the cutting tool 13 is fixed, the protrusion 17b of the washer 17 and the through groove 13a are in a mismatched state as shown in FIG. 17b is in contact with the front end surface of the cutting tool 13, and the short pin 2
1 and the small hole 23 are fitted together, and in this state, when the clamp bolt 14 is rotated in the loosening direction, the short pin 21 and the small hole 23 are fitted, so the washer 17 does not rotate. Since only the bolt 14 rotates and the washer 17 is prevented from coming off by the retaining ring 19, it moves backward together with the bolt 14 and leaves the cutting tool 13. When the short pin 21 comes out of the small hole 23, the rotation preventing force against the washer 17 is removed, so the washer 17 rotates together with the bolt 14 due to the action of the friction ring 18, but the long pin 20 and the long groove 22 are still not fitted. As shown in FIG. 5, the washer 17 rotates to the limit position where the long pin 20 comes into contact with one end of the long groove 22, and the rotation is stopped here, and as a result, the protrusion 17b and the through groove 13a match in the axial direction. Therefore, in this state, the cutting tool 13
If you pull it out, the protrusion 17b will not interfere, so
The cutting tool 13 can be removed from the tool holder 10.

Furthermore, when attaching the cutting tool 13 to the tool holder 10, the operation described above can be reversed. After fitting the cutting tool 13 into the mounting shaft portion 10a of the tool holder 10, When the bolt 14 is tightened, the washer 17 rotates together with the bolt 14 until the projection 17b is mismatched in the axial direction with respect to the through groove 13a as shown in FIG. 4, and then the washer 17 is inserted into the cutting tool. 13 together with the bolt 14, and finally the protrusion 17b presses the front end surface of the cutting tool 13, thereby moving the cutting tool 13 into the tool holder 1.
It can be fixed relative to 0.

Therefore, in the above holder, the cutting tool 13 can be attached to and detached from the tool holder 10 by simply loosening or tightening the clamping bolt 14 without removing it.

In the above embodiment, the long and short pins 20, 2
1 is attached to the tool holder 10, and corresponding long grooves 22 and small holes 23 are formed in the clamp washer 17. However, conversely, each long and short pin is attached to the clamp washer 17 to correspond to these. Of course, even if long grooves and small holes are formed in the tool holder 10, the same effect as described above can be achieved.

As is clear from the above description, according to the rotary cutting tool holder of this invention, a through groove is formed in the rotary cutting tool from the front end surface to the rear end surface thereof in a radial direction from the mounting hole, and A protrusion that loosely fits into the through groove is formed on the clamp washer, and with the through groove and the protrusion aligned, the cutting tool can be inserted into or removed from the tool holder, or inserted into the through groove. By tightening the clamping bolt with the protrusions in a mismatched state, the protrusions are pressed against the front end surface of the cutting tool and the cutting tool is fixed to the tool holder, so the clamping bolt can be especially removed. Cutting tools can be attached and detached by simply loosening or tightening them without having to do so, thus making the task quick and easy, thus reducing idle time and
Operation rate can be improved. Further, since the clamp washer is fitted onto the clamp bolt so that a predetermined frictional force exists between the clamp bolt and the clamp bolt, by rotating the bolt, the clamp washer can be rotated together. Further, since the clamp washer is configured to be rotated between a position where the protrusion matches the through groove and a position where these do not match, by rotating the washer to the rotation limit position, the The protrusion and the through groove can be automatically set to match or match, and therefore the cutting tool can be attached and detached more easily. Furthermore, since the clamp washer is configured to move back and forth together with the clamp bolt, when the bolt is loosened, the washer and the bolt move back and away from the cutting tool, which may occur when the cutting tool is fixed. Due to slight elastic deformation of each component, the washer does not remain in the fixed state,
Therefore, the cutting tool can be more easily removed from the tool holder.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a conventional rotary cutting tool holder, FIG. 2 is a cross-sectional view taken along the line - - in FIG. 1, and FIG. 3 is a cross-sectional view showing an embodiment of this invention.
FIG. 4 is a sectional view showing a state in which the protrusion and the through groove do not match, and FIG. 5 is a sectional view similar to FIG. 4 showing a state in which the protrusion and the through groove match. 10... Tool holder, 11... Machine spindle, 13
... Cutting tool, 13a ... Penetration groove, 13b ... Mounting hole, 14 ... Clamp bolt, 17 ... Clamp washer, 17a ... Base portion, 17b ... Projection, 18 ... Friction ring, 19 ...Retaining ring, 20...
Long pin, 21...Short pin, 22...Long groove, 23...
...small hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A tool holder is fixed to the tip of the machine spindle, a rotary cutting tool is fitted around the outer periphery of the tip of the tool holder, and is clamped at the center of the tip surface of the tool holder. A rotary cutting tool holder into which a bolt is screwed, and a clamp washer fitted to the bolt is disposed between the head of the bolt and the rotary cutting tool, the rotary cutting tool having a front end thereof. A through groove penetrating from the surface to the rear end surface is formed radially from the mounting hole for the tool holder, and the clamp washer has a protrusion that loosely fits into the through groove and has a slightly smaller diameter than the mounting hole. A friction member is provided between these bolts and the clamp washer, and is formed radially from the base portion of the bolt and the clamp washer, and provides a frictional resistance force against relative rotation between the bolt and the clamp washer. A stop member is provided that integrates the bolt and the clamp washer in the axial direction, and furthermore, the rotation of the clamp washer relative to the tool holder is mismatched with the position where the protrusion matches the through groove of the rotary cutting tool. 1. A quick change holder for a rotary cutting tool, characterized in that a pin for regulating the position and a long arc-shaped groove into which the pin is inserted are provided on the distal end surface of the tool holder and the clamp washer.