JPS608170B2 - tool fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tool fastening device for detachably attaching a tool to the main shaft of a machine tool.

Generally, in this type of tool fastening device, it is desired that the tool be easily attached to and detached from the main shaft of the machine in a short time.

Figures 1 and 2 are conventional examples of tool fastening devices that take this point into consideration.
The tool body 2 is fastened to the main shaft 1 by inserting four bolts 4 into the flange 3 of the tool and tightening the bolts 4 in the direction of the main shaft 1. has been done. Moreover, in this case, the bolt insertion hole 5 formed in the flange portion 3 has a keyhole-shaped large diameter portion 5a into which the head of the bolt 4 is inserted and a small diameter portion 5b into which the threaded portion of the bolt 4 is inserted. It is composed of lotus. Therefore, in this conventional device, when attaching and detaching the tool body 2 from the spindle 1, the bolts 4 are loosened to some extent even if they are not completely removed, and the tool body 2 is rotated by a predetermined angle 8. 2 can be attached and detached relatively easily by pulling it out in the direction of the ball. The same applies to the attachment operation. Note that the tool body 2 is formed with a protrusion 7 that fits into the fitting recess 6 of the main spindle 1, and by fitting this protrusion 7 into the fitting recess 6, the tool main body 2 is fitted into the main spindle 1. It is designed so that it can be installed in a specified position,
Further, a cutting blade tip 8 is detachably attached to the tip of the tool body 2 by means such as a screw.

By the way, in this type of tool fastening device, four bolts 4 are used each time the tool body 2 is replaced.
The tool body 2 must be removed by loosening each bolt 4, and then another tool body must be attached by tightening the bolts 4... The disadvantage of being troublesome cannot be overcome.

Moreover, on the other hand, there are multiple (four) bolts 4 each independent of each other.
Since the tightening is performed by..., it is almost impossible to equalize the tightening force of each bolt 4..., and therefore the mounting contact surface pressure of the tool body 2 is constant. However, there are problems such as a negative effect on mounting accuracy. Furthermore, the mounting strength is not sufficient. This invention was made in view of the above circumstances, and its purpose is to enable the tool body to be quickly and reliably attached and detached by a simple operation of rotating the vertical ring. It is an object of the present invention to provide a tool fastening device that can improve the mounting accuracy of a tool body and can also obtain a large tightening force based on the slope principle.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 5.

An adapter body 11 is attached to the tip of the main shaft IQ of the machine tool with a bolt 12. This adapter body 11 is for detachably attaching a tool body 14 having a cutting edge tip 13. Therefore, a through hole 15 is formed in the center of the adapter body 11 and runs in the marlin direction, and a sliding member 16 that slides in the marlin direction is built into the through hole 15. has been done.
This sliding member 16 is for connecting the tool body 14, and an engagement recess 17 is formed on the tool body 14 side.
8 are joined together. Here, the engagement recess 17 and the engagement protrusion 18 of the tool body 14 that engages the engagement recess 17.
I will explain about.

First, regarding the competition protrusion 18 on the tool body 14 side, this iron joint protrusion 18 is provided to protrude from the center of the positioning shaft 14a that is protruded from the tool body 14 on the adapter body 11 side. There is. The shape of the iron joint protrusion 18 is such that the neck 18a and the head 18b are T-shaped, and the head 18b has a flange 18c extending outward from the neck 18a. Next, regarding the engagement recess 17 on the sliding member 16 side, this engagement recess 17 is
Notch portion 19 formed along the axial direction of Numakin member 16
and a locking groove 20 having a substantially U-shaped cross section and extending through the notch 19 and extending along the circumferential direction.
Therefore, the relationship between the engagement recess 17 and the iron fitting protrusion 18 configured as described above is as follows. That is, the flange 18c of the iron fitting protrusion 18 is inserted into the notch 19 of the engagement recess 17, and then the tool body 14 is rotated by a predetermined angle of 0.
When the flange 18c is inserted into the locking base 20 of the engagement recess 17, the flange 18c remains locked in the locking groove 20 even if the steel projection 18 is simply pulled in the axial direction. , the tool body 14 will not be pulled out. By the way, the amount of rotation of the tool body 14 is determined by the arc length (8 in terms of angle) of the arc-shaped groove 21 formed on the support surface 14b of the tool body 14 that abuts the support surface 11a of the adapter body 11. It will be decided.

In this case, a positioning pin 22 protruding from the rear surface 11a of the adapter body 11 is inserted into the arcuate groove 21, and the stopper action of this positioning pin 22 causes the amount of rotation of the tool body 14. 8 will be regulated. Next, a tightening mechanism for moving the sliding member 16 along the axial direction and tightening the tool body i4 to the adapter body 11 will be described.

A cam ring (tightening ring) 23 is rotatably attached to the outer circumferential surface of the sliding member 16, and one side of the cam ring 23 (the end surface on the main shaft 10 side) has a ring as shown in FIG. A plurality of protrusions 25 having sloped surfaces 24 are formed symmetrically with respect to the marlin. and,
Between the inclined surface 24 and the flange portion 16a of the sliding member 16, a steel ball 26 corresponds to the inclined surface 24,
Moreover, the position is regulated by a position regulating ring 27 so as not to move in the circumferential direction. Further, a turning bar 28 is attached to the cam ring 23 so as to protrude in the ridge direction. One end portion (outer periphery side weave portion) of the turning bar 28 penetrates through the adapter main body 11 and projects to the outside. Further, the protruding portion of the turning rod 28 is attached to a fastening ring member 29 rotatably attached to the outer peripheral portion of the adapter body 11. Then, when the ring part 29 is rotated, the rotating part 29 is rotated.
8 rotates to rotate the cam ring 23. Further, a coil spring 30 for pushing out the sliding member 16 toward the tool body 14 is provided at the rear end of the sliding member 16 (texture on the main shaft 10 side), and the sliding member 16 is rotated. A rotation locking pin 31 is also provided to prevent movement. Further, a reference shaft 33 is attached to the end of the adapter body 11 on the main shaft 10 side by a screw 34, and is positioned by fitting into the joint portion 32 of the main shaft 10. Next, a case will be described in which the tool body 14 is attached to the adapter body 11 of the tool fastening device configured as described above.

First, in order to connect the tool body 14 to the adapter body 11, the flange 18c of the iron coupling protrusion 18 is made to correspond to the notch 19 of the engagement recess 17, and the flange 18c is aligned along the axis of the main shaft 10.
After that, the tool body 14 is rotated by a predetermined angle eight times in the direction of arrow A.

Then, the collar portion 18c is inserted into the locking groove 20 of the engagement recess 17, so that the tool body 14 will not be pulled out. In this case, when pushing the competitive protrusion 18 into the engagement recess 17, the positioning shaft 14 of the tool body 14
a into the through hole 15 of the adapter body 11, and at the same time insert the positioning pin 22 of the adapter body 11 into the arcuate groove 21 of the tool body 14. As a result, the tool body 14
is positioned at a predetermined position on the adapter body 11. Next, to tighten the tool body 14 to the adapter body 11,
The ring member 29 may be rotated in a predetermined direction (direction of arrow B in FIG. 5). That is, when the ring member 29 is rolled in this way, the cam ring 23 is rotated in both directions via the rotation rod 28, and thereby the protrusion 25 formed on one side of the cam ring 23 is rotated. Each inclined surface 24 moves in the direction of arrow B and presses the steel balls 26 against the flange portion 16a of the sliding member 16 according to the "slope principle". Then, the sliding member 16 is pressed against the main shaft 10 against the coil springs 3. As a result, the engagement recess 17
The tool body 14 is fastened to the adapter body 11 by the locking groove 20 locking the flange 18c of the joining protrusion 18 and drawing it toward the main shaft 10. In this case, cam ring 2
Since the protruding portions 25 having the inclined surfaces 24 are formed on the cam ring 3, a large attaching force can be obtained with a slight rotational force of the cam ring 23. Furthermore, when removing the tool body 14 from the adapter body 11, the operation described above may be reversed.

In this case, in particular, when the cam ring 23 is rotated in the direction opposite to the direction of arrow B, the sliding member 16 is pushed out toward the tool body 14 by the restoring force of the coil spring 30, so that the tool body 14 can be removed smoothly and quickly. be able to. In the above embodiment, the inclined surface 24 of the cam ring 23 presses the sliding member 16 via the steel balls 26, but the present invention is not limited to this, and for example, instead of the steel balls 26, the present invention can be applied. flange portion 1 of the sliding member 16.
There is no problem even if it is provided in 6a.

However, in the case of the steel ball 26, since it acts as a roller, the cam ring 23 can be rotated more smoothly. Furthermore, in the above embodiment, the tool body 14 is provided with the mating protrusion 18, and the adapter body 11 side is provided with the engagement recess 1.
7, but the present invention is not limited to this. For example, the tool body 14 may be provided with an engagement recess, and the sliding member 16 of the adapter body 11 may be provided with a saddle mating protrusion 18. It may be something. In this case, the tool body can be made lighter than that of the above-mentioned embodiments, making it easier to handle the tool body. As described above, the present invention provides a tool fastening device for removably fastening a tool body having a cutting tip attached to the tip of a main shaft of a machine through an adapter body, in which a tool is inserted into the adapter body in the axial direction. A sliding member that slides is provided in the center of either the sliding member or the tool body, and a hook-fitting protrusion having a flange is provided in the center of the other, and the flange is located in the center of the other tool body. An engaging recess consisting of a notch suitable for insertion into the notch and a locking groove extending circumferentially through the notch is provided, and furthermore, the sliding member is pressed against the outer periphery of the sliding portion toward the main shaft side. A rotating ring with multiple inclined surfaces is rotatably attached, and a rotating rod that penetrates the adapter body and protrudes to the outside is provided on this additional ring. By simply moving the tool and rotating the tightening ring, the tool body can be installed and removed easily and quickly.Also, by simply rotating the cotton-tight ring, it is possible to attach and remove the tool body at the same time. Since it can be moved, the tool body can be tightened with even force,
As a result, the tool body can be attached to the adapter body with high accuracy, and since the tightening ring has an inclined surface, a large vertical clamping force can be obtained with a small rotational force of the tightening ring. There is no need to provide a flange on the main body, making it lightweight and easy to handle.Furthermore, the tool body can be attached to the main shaft of the machine via the adapter body, making it suitable for all kinds of machines. This has the effect of making it possible to install.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a conventional tool fastening device, FIG. 2 is a cross-sectional view taken along line n-ro, FIG. 3 is a partially cutaway front view of a tool fastening device according to the present invention, and FIG. The figure is W-W in Figure 3.
A sectional view taken along the line, FIG. 5 is an explanatory diagram showing the relationship between a fastening ring (cam ring) and a steel ball. 10... Main shaft, 11... Adapter body, 13... Cutting blade tip, 14... Tool body, 15... Through hole, 16... ... Sliding member, 17 ... Engagement recess, 18 ... Steel joint protrusion, 19 ... Notch, 20 ... Locking groove ,
23...Cam ring (tightening ring), 24...
... Sloped surface, 28 ... Turning bar. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a tool fastening device that removably fastens a tool body to which a cutting blade tip is attached to the tip of a main shaft of a machine via an adapter body, a sliding member that slides in the axial direction of the adapter body is provided. A fitting protrusion having a flange is provided at the center of either the sliding member or the tool body, and a notch through which the flange is inserted in the axial direction is provided at the center of the other, and this notch is provided with a notch in the center of the other. A fastener is provided with an engaging recess formed of a locking groove that communicates and runs in the circumferential direction, and further has a plurality of inclined surfaces running in the circumferential direction on the outer periphery of the sliding member for pressing the sliding member toward the main shaft. a rotatable ring which is rotatably attached to the clamping ring, one end of which protrudes to the outside through the adapter main body, and which rotates the clamping ring by moving itself in the circumferential direction; A tool fastening device characterized by being provided with a rod.