JPS6221369Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting tool such as a boring cutter, and in particular, allows the tool holder to be quickly attached and detached from the attachment body, and also to be attached reliably.

Conventionally, as this type of cutting tool, a so-called quick change type cutting tool has been proposed in which a tool holder can be attached and detached while the mounting body remains attached to the machine tool. This is aimed at shortening the time for changing tools, and for example,
This is disclosed in Publication No. 30-5740 and the like.

However, what was disclosed in this bulletin is
It has drawbacks such as a complicated mechanism and weak tightening force, and there is a demand for the development of an improved version.

The present invention was developed in view of the above points, and the central boss portion of a tool holder equipped with a cutting tip is fitted into the receiving hole of the mounting body, and the mounting body and the tool holder are
The present invention provides a cutting tool that can be rationally attached and detached by means of a traction member, a pressing wedge, and a clamping ring.

An embodiment of the cutting tool of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a mounting body that is attached to a machine tool (not shown), and a receiving hole 2 and a housing hole 3 are respectively provided in series in the direction of its central axis.

A central boss portion 6 of a tool holder 5 equipped with an appropriate cutting tip 4 is fitted into the receiving hole 2, and both the receiving hole 3 and the traction member in the receiving hole 2 are fitted into the receiving hole 2. It is mechanically fixed by the axial movement of 7.

That is, this traction member 7 has a flange portion 7a and a protrusion portion 10 formed on its shaft portion, and this flange portion 7a is located within the accommodation hole 3, and the protrusion portion 10 at one end thereof protrudes from the receiving hole 2. It is inserted into the internal circular hole 9 from the square groove 8 of the tool holder 5. Inside this internal circular hole 9, a protruding portion 10 of the traction member 7 performs a locking action at a position offset from the square groove 8.

Further, a tightening ring 12 is provided on the outer periphery of the tool holder 5 and extends to the shaft portion 11 of the mounting body 1.
The rotation of the clamping ring 12 causes an axial movement of the traction member 7 via at least one pair of pressure wedges 14 .

That is, this tightening ring 12 has at least one pair of inner circumferential cam surfaces 13 formed on the inner circumference on the mounting main body 1 side, and for this inner circumferential cam surface 13,
Insertion hole 1a drilled in the outer periphery of the mounting body 1
The pressure wedges 14 which extend radially in and out are arranged in contact with each other. In this case, it is preferable that a spring 15 is wound around the pressing wedge 14 as shown in the figure for functional reasons, and for the traction member 7,
The inclined surfaces 16 and 17 are in contact with each other.

Further, a spring 19 is interposed between the inclined surfaces 16, 17 and the centering plug 18, so that the centering plug 18 can be smoothly moved back and forth in the axial direction.

In the illustrated case, the tightening ring 12 can be attached to and detached from the tool holder 5 in the axial direction by interposing a key 20 and a key groove 21 therebetween.

In the cutting tool of the present invention constructed in this way, by rotating the tool holder 5 or the tightening ring 12, the inner cam surface 13 is moved into the pressing wedge 14.
The tool holder 5 is mechanically fixed by the protruding part 10 of the traction member 7 in order to act on the traction member 7 via the traction member 7 .

Further, the tool holder 5 can be easily removed if the protruding portion 10 is not engaged with the internal circular hole 9, allowing it to pass through the square groove 8. . In attaching the tool holder 5, it is necessary to match the tightening direction to the principal force of the cutting resistance of the cutting tip 4.

As explained above, the present invention allows the tool holder to be easily and quickly attached and detached from the mounting body by using the traction member, which reduces the operation time for changing tools and increases the mounting rigidity of the tool holder. It has the advantage of being able to

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the cutting tool of the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1. 1...Mounting body, 2...Accepting hole, 3...Accommodating hole, 5...Tool holder, 6...Central boss section,
7... Traction member, 8... Square groove, 9... Internal circular hole, 10... Protruding portion, 12... Tightening ring,
13... Inner cam surface, 14... Pressing wedge.

Claims (1)

[Claims for Utility Model Registration] A central boss portion 6 of a tool holder 5 equipped with a cutting tip 4 is fitted into the receiving hole 2 of the mounting body 1, and the mounting body 1 and the tool holder 5 are fitted together. However, in a cutting tool that can be attached and detached by a traction member 7, a pressing wedge 14, and a tightening ring 12, the attachment body 1 has a receiving hole on one end thereof into which the central boss portion 6 is fitted. A receiving hole 3 in which the traction member 7 is located is provided at the other end so as to communicate with the receiving hole 2, and at least one pair of receiving holes 3 into which the pressing wedge 14 is inserted is provided on the outer peripheral side thereof. An insertion hole 1a is provided so as to communicate with the accommodation hole 3, and the tool holder 5 has a central boss portion 6 protruding from its end, and the central boss portion 6 has a central boss portion 6 at an open end thereof. An internal circular hole 9 with a square groove 8 is bored therein, and the traction member 7 is formed with a flange portion 7a having a protruding portion 10 and an inclined surface 16 at both ends of its shaft portion; Part 7a
is located within the receiving hole 3 and the receiving hole 2
A protruding portion 10 protruding from the central boss portion 6 is inserted into the inner circular hole 9 from the square groove 8 of the central boss portion 6, and elastic force is applied to enable movement in the axial direction. The pressing wedge 14 is inserted into the insertion hole 1a of the mounting body 1.
The tightening ring 12 is movable within the traction ring 12, and its inclined surface 17 is brought into contact with the inclined surface 16 of the traction member 7, thereby enabling the axial movement of the traction member 7. At least one pair of inner circumferential cam surfaces 13 are formed on the inner circumferential portion of the mounting body 1 located on the shaft portion 11 side, and the pressing wedge 14 is brought into contact with the inner circumferential cam surfaces 13. Characteristic cutting tools.