JPS6325883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quick change tool in which a cutting head can be attached to and removed from one end of a holder body, and is particularly suitable for medium to large-sized tool holders.

Conventionally, this type of quick change tool has been disclosed, for example, in Japanese Patent Application Laid-Open No. 55-54104. This quick change tool forms a circular bulge head at one end of the towing shaft,
A central groove into which the bulging head is inserted is formed on the cutting head side. And this quick change tool is certainly excellent in terms of quick replacement.

However, this quick change tool requires machining precision in forming the bulging head and the central groove, and is not necessarily satisfactory in terms of mounting strength and rigidity due to the configuration of the central groove.

For this reason, there is a demand for the development of a quick change tool of this type that has an improved quick change mechanism that increases the mounting strength and rigidity of the cutting head.

The present invention has been made in view of the above-mentioned points, and has a bar shape, and one end thereof is provided with a notch step provided with a key block, and the vertical wall portion of the notch step is opened in the axial direction. a holder body with a receiving hole drilled therein, a traction shaft that is located in the receiving hole of the holder body and whose locking head and neck protrude toward the notch step side, and a locking head. and a cutting head which is disposed within a notch step with a protruding neck portion and which is pulled and fixed by the traction shaft.

Hereinafter, one embodiment of the quick change tool of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a rod-shaped holder body having a rectangular cross section. A notch step 3 is formed at one end of the holder main body 1, and a notch step 3 is formed in the axial direction perpendicular to the notch step 3. A receiving hole 2 is bored to open the wall portion 3a.

A traction shaft 5 with a locking head 4 protruding toward the cutout step 3 is fitted into the receiving hole 2, and the traction shaft 5 has, for example,
It is towed by a nut 7 screwed into a threaded portion 6 at its rear end. In this case, the locking head 4 of the traction shaft 5 has a flange shape, and a cut surface 8 is formed in the axial direction, and this cut surface 8 is a third
As clearly shown in the figure, it makes surface contact with the upper surface 9a of the key block 9 protruding from the cutout step 3. As a result, the traction shaft 5 is slidable in the axial direction and is prevented from rotating.

Note that the key block 9 is fixed onto the cutout step 3 by a set screw 10 in the illustrated case.

In the cutout step portion 3 configured in this way,
A cutting head 13 to which a cutting tip 11 and a pad 12 are attached by suitable means is arranged.

This cutting head 13 is clearly shown in FIG.
3b, rear vertical surface 13a and intermediate vertical surface 1
7 are formed respectively. And this lower surface 13
b and the rear vertical surface 13a are provided with a bag groove 14 and a U for receiving the locking head 4 and neck portion 5a.
The openings 15 are arranged one after the other. In this case, the blind groove 14 is connected to the locking head 4 with respect to the U-shaped opening 15.
It is formed as an enlarged hole to accommodate the

Therefore, the cutting head 13 is configured such that the U-shaped opening 15 is positioned by both guide side surfaces 9b of the key block 9 and protrudes from the tip end surface 16 with respect to the holder body 1.

In the quick change tool of the present invention constructed in this way, the traction shaft 5 is towed by the rotation of the nut 7, and is attached and detached by the locking head 4 located in the bag groove 14 of the cutting head 13. action is taken.
In this case, the cut surface 8 of the locking head 4 of the traction shaft 5 comes into sliding contact with the upper surface 9a of the key block 9. Further, the U-shaped opening 15 of the cutting head 13 is positioned by both guide side surfaces 9b of the key block 9. Since the vertical surface 17 of the cutting head 13 is pressed against the tip end surface 16 of the holder main body 1, accuracy can be easily maintained and the cutting head 13 is assembled with high rigidity. This corresponds to the step surface 3b of the cutout step 3 and the vertical wall portion 3.
a. This is because the tip end surface 16 of the holder body 1 and both guide side surfaces 9b of the key block 9 are configured to receive cutting resistance.

Note that the U-shaped opening 15 of the cutting head 13 opens at the rear vertical surface 13a and the lower surface 13b;
Since it is configured to be hidden during cutting, there is no risk of chips entering.

As explained above, the present invention provides a cutting head 1.
3 is attached and detached by the traction shaft 5, and in particular, the rotation of the traction shaft 5 and the positioning of the cutting head 13 are rationally performed by the key block 9. It also has increased rigidity. This configuration can also be easily processed.

Therefore, the quick change tool of the present invention has the advantage that it can be used in large-sized and medium-sized turning lathes, large-sized boring machines, etc., and can improve the operating rate thereof.

[Brief explanation of drawings]

FIG. 1 is a front view with main parts cut away showing an embodiment of the quick change tool of the present invention, and FIG.
Similarly, FIG. 3 is a plan view with main parts cut away, FIG. 3 is a perspective view showing the structure of the shank body, and FIG. 4 is a perspective view showing the cutting head. 1... Holder body, 2... Acceptance hole, 3... Notch step, 4... Locking head, 5... Traction shaft, 7... Nut,
8... Cutting surface, 9... Key block, 11... Cutting blade tip, 13... Cutting head, 14... Cap groove, 15... U-shaped opening, 16... Tip surface, 17... Vertical surface.

Claims (1)

[Claims] 1. Has a rod shape, and has a key block 9 at one end.
A holder main body 1 is provided with a cutout step 3 having a cutout step 3, and a receiving hole 2 is bored in the axial direction of the cutout step 3 so as to open a vertical wall portion 3a of the cutout step 3.
and a traction shaft 5 which is located in the receiving hole 2 of this holder body 1 and whose locking head 4 and neck portion 5a protrude toward the notch step 3 side; In the quick change tool, the tool includes a cutting head 13 disposed in the protruding cutout step 3 and pulled and fixed by the traction shaft 5, wherein the traction shaft 5 has a flange-shaped engagement An axial cutting surface 8 is formed on the stop head 4, and this cutting surface 8
The cutting head 13 is slidable in the axial direction and is prevented from rotating by coming into surface contact with the upper surface 9a of the key block 9 provided protrudingly on the step surface 3a of the cutout step 3. , step surface 3 of cutout step 3
b. A lower surface 13b, a rear vertical surface 13a and an intermediate vertical surface 17 are formed to fit the vertical wall portion 3a and the tip surface 16, and the lower surface 13b and the rear vertical surface 13a
is provided with a cap groove 14 and a U-shaped opening 15 for receiving the locking head 4 and neck portion 5a, respectively, and the U-shaped opening 15 is positioned by both guide side surfaces 9b of the key block 9. A quick change tool characterized by being made to