JPH0318085Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a cutting tool holding device that allows cutting tools to be easily and quickly replaced in a cutting machine.

Prior Art A fixed cutting tool and a rotary cutting tool in a conventional cutting machine were attached to a holder 1 with a tightening screw 2, as shown in FIG. Therefore, when replacing the tool, the tightening screw 2 must be slightly loosened, the cutting tool 4 removed, replaced with a new cutting tool, and retightened, which takes time.

Purpose of the invention This invention is a cutting tool holding device that does not require the operation of tightening parts such as bolts and nuts, and does not require the attachment or detachment of any parts other than the cutting tool body, and allows the cutting tool to be replaced easily and quickly. For the purpose of providing.

Structure of the device In order to achieve the above object, this device inserts a piston-shaped clamp rod from the opposite side into the inner hole of the cylindrical holder body into which the mounting part of the cutting tool is fitted. The clamp part is equipped with a mechanism that engages the mounting part of the cutting tool at a certain relative rotational position between the cutting tool and the holder body, and the clamp rod is provided with a mechanism that engages the mounting part of the cutting tool at a certain relative rotational position. This is a cutting tool holding device that tightens the cutting tool and allows the cutting tool to be extracted by the fluid pressure of the fluid chamber formed between the clamp part and the back cover.

Embodiments This invention will be described below based on drawings showing embodiments. FIG. 2 is a longitudinal sectional view of the cutting tool holding device according to this invention, which holds a cutting tool. 11
is a cylindrical holder main body having a thick side wall, and a back cover 12 is attached to one end with a mounting bolt 13. A piston-shaped clamp rod 14 has a clamp portion 15 and a rod portion 16.
The clamp part 15 is slidably inserted into the inner hole of the holder main body 11, and the rod part 16 extends rearward.
is inserted through a through hole provided in the back cover 12, and its free end 16a protrudes to the outside. An elastic body 17 (disc spring in the figure) is inserted through the free end 16a and tightened by the adjustment nut 1 via a washer 18. 20 is a sealing material, and the clamp part 15
A fluid chamber 21 is formed between the rear end and the inner surface of the back cover 12. The fluid chamber 21 communicates with an external fluid source (not shown) through a communication hole 22 provided at the rear side wall of the holder body 11. A detent pin 23 is embedded in the intermediate portion of the side wall of the holder main body 11, and its tip protrudes from the inner surface of the side wall and engages with a longitudinal groove 15a provided on the outer peripheral surface of the clamp portion 15. Further, a positioning pin 24 is embedded on the end surface of the holder main body 11 on the opening side.

A cutting tool 31 is provided with a cutting tip 32 at its tip. Reference numeral 31a denotes a collar portion, and a round bar-shaped mounting portion 33 is provided behind the collar portion. The mounting portion 33 is fitted into the inner hole of the holder main body 11, and the collar portion 31a is joined to the front end of the holder main body 11. Mounting part 33
An engagement rod 34 with a smaller diameter protrudes from the tip of the engagement hole 25 provided in the end surface of the clamp portion 15.
inserted into. Along the circumference of the entrance portion of the engagement hole 25, a flange portion 25a and a notch groove 25b are provided. As shown in FIG. 3, the distal end of the engagement rod 34 is provided with petals 34a on a portion of the circumference (in two symmetrical directions in the figure). Cutting tool 31
is completely inserted into the engagement hole 25 when the axial direction of the petal 34a coincides with the direction of the notch groove 25b.
Next, when the cutting tool 31 is rotated by a certain angle around the axis, the petal 34a engages with the flange portion 25a, and the cutting tool 31 becomes in a state where it cannot be removed. On the rear end surface of the flange 31a of the cutting tool 31, as shown in FIG.
The direction of the flange corresponds to the flange 25a, and the other end is the petal 34a.
The direction is set to match the notch groove 25b. The relationship between the above-mentioned engagement hole 25 and engagement rod 34 is reversed, and the engagement hole 25 is provided on the cutting tool side.
An engagement rod 34 may be provided on the rod side.

When mounting a cutting tool on the cutting tool holding device configured as described above, align the disengaged end of the positioning groove 31b of the cutting tool 31 with the positioning pin 24 of the holder main body 11, and then attach the mounting portion 33. Insert into the inner hole of the holder main body 11. Clamp rod 1
4 is in the retracted position due to the reaction force of the elastic body 17, so when fluid pressure is applied to the fluid chamber 21 and the clamp rod 14 is advanced, the petal 3 of the cutting tool 31
4a passes through the cutout groove 25b of the clamp portion 15 and is completely inserted into the engagement hole 25. Next, the cutting tool 31 is rotated around the axis, and when the positioning pin 24 comes into contact with the engaging end of the positioning groove 31b,
When the fluid pressure is released, the clamp rod 14 is pulled back by the reaction force of the elastic body 17, and the petal 34a of the cutting tool 31 is pulled against the flange 25a of the engagement hole 25.
The cutting tool 31 is held tightly by the holder main body 11.

When removing the cutting tool 31, first pressurize the fluid chamber 21 to loosen the clamping force of the clamp part 15, and then rotate the cutting tool 31 so that the disengaged end of the positioning groove 31b is aligned with the positioning pin. 24, the cutting tool 31 is pulled out.

Effects of the invention As explained above, this invention is a cutting tool holding device that fits and fixes a cutting tool in a cylindrical holding tool body. By Rodd,
By making it possible to engage and disengage the cutting tool,
There is no need to operate tightening parts such as bolts and nuts, and there is no need to attach or detach any parts other than the cutting tool itself, making it possible to easily and quickly replace the cutting tool. There is an effect that the connecting force of the rod can be easily adjusted by using an adjustment nut provided outside the holder main body.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional cutting tool holding device holding a cutting tool, Fig. 2 is a longitudinal cross-sectional view of an embodiment of this invention holding a cutting tool, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 2. Figure 4 is the same as Figure 2 -
FIG. 11... Holder body, 14... Clamp rod, 17... Elastic body, 21... Fluid chamber, 23...
Stopping pin, 24... Positioning pin, 25...
Engagement hole, 31... Cutting tool, 31b... Positioning groove, 34... Engagement rod.

Claims (1)

[Scope of utility model registration request] A cylindrical holder main body having a thick side wall, a back cover that closes one end of the holder main body, a rod part inserted through a through hole of the back cover, and a clamp part sliding into the inner hole of the holder main body. A cutting tool having a piston-shaped clamp rod that can be inserted into the holder body, and a round bar-shaped mounting portion of the cutting tool fitted from the other end of the holder main body is engaged and fixed by the clamp rod. The holding device is provided with an engagement mechanism at an end of the clamp portion of the clamp rod that corresponds to an engagement mechanism provided at the end of the mounting portion of the cutting tool;
These engagement mechanisms are configured to engage at a certain relative position around the axis and disengage at other relative positions, and a locking pin is provided on the inner surface of the side wall of the holder main body. an arcuate shape provided on the joint surface of the flange of the cutting tool, which engages with a vertical groove provided on the outer peripheral surface of the clamp portion of the clamp rod, and also includes a positioning pin on the opening side end surface; One end engages with a positioning groove corresponding to the engagement position of the engagement mechanism and the other end similarly corresponds to the disengagement position, and the free end of the rod portion of the clamp rod has an elastic member between it and the back cover. A communication hole is provided in the rear part of the side wall of the holder body to communicate the fluid chamber formed between the end surface of the clamp part and the inner surface of the back cover with an external fluid source. A cutting tool holding device characterized by: