JPH0839325A - Throwaway type cutting tool - Google Patents

Abstract

PURPOSE:To facilitate the throwing of a throwaway tip in a tool such as a face cutter, and allow the fine and precise regulation. CONSTITUTION:A regulating screw 5 is installed between a tool body 2 and a tip 3 fixed to the tool body 2 by a wedge 4 into the state where the fastening direction is substantially laid along the radial direction of the tool body 2, so that a contact part 22b formed on the regulating screw 5 pushes the tip 3 in the front direction according to the fastening to throw it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type cutting tool such as a face milling machine which is a cutting tool having a plurality of throw-away tips attached to the outer periphery of the tip of a disk-shaped tool body.

[0002]

2. Description of the Related Art The above face milling cutter is generally used as a cutting tool for flattening a work material, and has a throwaway tip protruding from the tip end surface of the tool body on the outer periphery of the tip end of the substantially disk-shaped tool body. (Hereinafter referred to as a chip) is attached. Then, the tool main body rotates at a high speed around its axis and moves relatively to the work material in a substantially radial direction, so that the tip cuts the work material and forms a desired flat surface on the work material.

A plurality of chips are usually attached to the outer periphery of the tip of the tool body at equal intervals. The method of attachment is to insert the tips into a chip mounting seat formed on the tool body and the tool body. A general method is to hold it by sandwiching it with a wedge attached to the. Since the tip of the tip projects by a predetermined length from the tool body, cutting can be performed, and the projecting is called "shaking". The swing out is required to be constant in all the chips attached to the tool body. For this reason, between the front side of the insert and the tool body, screw the adjustment screw into the tool body, and make sure that the tip always contacts the head of the tool body. Measures such as adjustment are taken.

[0004]

According to the above-mentioned swing adjusting means, in order to rotate the adjusting screw, the tool is inserted into the narrow gap formed between the tool body and the tip to adjust the head of the adjusting screw. The operation to rotate the part was required, and it was a very difficult task. Further, the amount of tip ejection is the same as the amount of tightening of the adjusting screw into the tool body. Therefore, if the pitch of the adjusting screw is made smaller, fine adjustment can be made according to it, but there is a limit to making the pitch smaller, and it is impossible to make further fine adjustment.

The present invention has been made in view of the above circumstances, and makes it possible to easily adjust the chip ejection.
The purpose is to provide a throw-away type cutting tool that enables extremely delicate and precise adjustment.

[0006]

The present invention has been made in order to achieve the above-mentioned object, and a throw-away tip projecting from the tip end surface of the tool body is provided on the outer periphery of the tip end of the disk-shaped tool body. In a throw-away type cutting tool that is attached so as to be movable in the axial direction of the main body and fixed by a wedge at a desired position, an adjustment screw is provided between the tool body and the tip end side of the throw-away tip. The throw screw is mounted so that it can be retracted from the outer peripheral surface in a substantially radial direction, and the adjusting screw is provided with a contact portion for a throw-away tip having a peripheral surface coaxial with the adjusting screw. A throw-away type cutting tool in which an abutted surface on the opposite tip side of the away tip is formed obliquely with respect to the axial direction of the adjusting screw.

The tool body may further include a fitting portion for slidingly fitting the adjusting screw at a plurality of spaced positions.

[0008]

According to the present invention, the tip of the adjusting screw is projected from the tip of the tool body while the abutting portion of the adjusting screw slidingly contacts the abutted surface of the tip by tightening or pulling out the adjusting screw.
Deflection of the tip according to the tightening amount is delicate and precise. By forming a fitting part in the tool body where the adjusting screws slidably fit in a plurality of spaced positions, the swinging of the adjusting screw is restricted by the fitting part, and forces other than tightening or withdrawing operations can be applied to the tip. Does not reach.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a face mill (throw-away type cutting tool) 1 as one embodiment. FIG. 2 is an enlarged view of part P of FIG. The milling cutter 1 mainly includes a disc-shaped tool body 2, a tip 3, a wedge 4 and an adjusting screw 5 attached to the tool body 2. During the explanation,
Regarding the directions such as the axial direction and the radial direction, the tool body 2
It is defined here as the one for.

As shown in FIG. 3 and FIG. 4, a plurality of chip pockets 10 that form an arcuate inner surface are circumferentially equidistantly provided on the outer peripheral portion on the tip side (lower side in FIG. 1) of the tool body 2. Has been formed. On the side opposite to the tool rotating direction of the tip pocket 10, that is, on the rear side, a tip mounting seat 11 is provided.
Are formed. The tip mounting seat 11 is composed of a main wall surface 11a extending in a substantially radial direction that is directed rearward in the tool rotation direction, a back wall surface 11b on the radial rear side, and a rear wall surface 11c on the rear side of the tool front surface. . This tip mounting seat 1
A wedge mounting groove 12 that communicates with the chip mounting seat 11 is formed further rearwardly of 1.

The tip 3 is a substantially square plate-like body made of a hard material such as cemented carbide, and its cross section is trapezoidal. When viewed in cross section, one surface on the lower bottom side is the chip mounting seat. 1
No. 1 main wall surface 11a, and the opposite surfaces to the inner wall surface 11b and the rear wall surface 11c are closely contacted to the inner wall surface 11b and the rear wall surface 11c, respectively. It is supposed to be held in.

The wedge 4 is fixed to the tool body 2 by a clamp screw 14 which is screwed into a central screw hole 4a and tightened into a screw hole 13 formed in the tool body 2, and the tip 3 is
It is sandwiched between the wedge 4 and the chip mounting seat 11 and fixedly held. The clamp screw 14 has a right-hand thread on the tip side,
The base end side is a so-called double screw having a left screw, the right screw is screwed into the tool body 2, and the left screw is screwed into the wedge 4.
The tip 3 is attached obliquely with respect to the axial direction so that one corner cutting edge portion 3a is shaken out from the tool body 2 by a predetermined amount.

Now, the swinging out is performed by the adjusting screw 5 arranged between the tip end side of the tip 3 and the tool body 2. The adjusting screw 5 is, as shown in FIG.
A head portion 22 is integrally formed with a screw portion 21 corresponding to a screw hole 20 extending in a substantially radial direction, and an intermediate body portion 23 is formed in the middle of both. An end peripheral surface 22a having a uniform diameter is formed on the end side of the head portion 22, and a taper peripheral surface between the end peripheral surface 22a and the intermediate body portion 23 is gradually reduced in diameter toward the intermediate body portion 23 side. The contact portion 22b having the is formed. The head portion 22 and the intermediate body portion 23 having the end peripheral surface 22a and the contact portion 22b are all coaxial with the screw portion 21.

A counterbore 24 communicating with the screw hole 20 and having a diameter slightly larger than that of the head 22 is formed on the outer peripheral surface of the tool main body 2. Between the counterbore 24 and the screw hole 20, a screw is formed. Hole 2
First and second fitting portions 25 and 26 are formed from the 0 side. The counterbore 24 and the first and second fitting portions 25 and 26 are all coaxial with the screw hole 20 and have an inner circumference that gradually decreases in diameter toward the screw hole 20. The spot facing 24 and the second fitting portion 26 are provided in the chip pocket 10 and the wedge mounting groove 1.
Both are in communication with 2.

Now, the first fitting portion 25 is the intermediate body portion 2.
3, and the second fitting portion 26 has the same diameter as the end peripheral surface 22a of the head portion 22. Then, when the adjusting screw 5 is tightened into the screw hole 20, the adjusting screw 5 has the first fitting portion 25, the intermediate body portion 23, and the second fitting portion 2.
The end peripheral surface 22a of the head portion 22 is slidably fitted into 6 and tightened. At this time, the head 22
The contact portion 22b of the above-mentioned slide-contacts the surface (contacted surface) 3b on the side opposite to the tip end of the chip 3 and pushes the chip 3 in the front direction to move it. That is, the drawing is performed. Here, the contacted surface 3b is formed obliquely with respect to the axial direction of the adjusting screw 5, and as shown in FIG. 2, an angle θ exceeding 0 degree is set between them.

The method of swinging out the chips 3 in the milling cutter 1 will be described. First, the front side is up (that is, FIG. 1).
Clamp screw 1 for fixing wedge 4 in the opposite direction)
From the state where 4 is loosened, tighten the adjusting screw 5 as described above. Then, the contacting portion 22b of the adjusting screw 5 is tightened while slidingly contacting the contacted surface 3b of the chip 3, so that the chip 3 is pushed in the front direction, and depending on the amount of tightening the adjusting screw 5, Drawing to the side is made.

According to such a method of swinging out the tip 3 with the adjusting screw 5, since the rotating operation of the adjusting screw 5 is the same as the normal screw rotating operation and there is no difficulty at all, the swinging work can be easily performed. You can Further, the tip 3 is oscillated by being displaced in a direction substantially orthogonal to the moving direction of the adjusting screw 5, and the oscillating amount thereof is proportional to the tightening amount of the adjusting screw 5, but is not the same but small. Therefore, it is possible to make extremely delicate adjustments when performing the drawing. Then, by making the pitch of the adjusting screw 5 smaller or by setting the angle θ smaller, more delicate and precise adjustment can be performed.

Further, the first and second fitting portions 2 of the tool body 2
5, 26, the intermediate body portion 23 of the adjusting screw 5 and the end peripheral surface 22a.
By fitting and, the swinging of the adjusting screw 5 is restricted, and no force other than the tightening operation is transmitted to the tip 3. For this reason, precise swinging can always be performed stably.

[0019]

As described above, according to the throw-away type cutting tool of the present invention, the throw-away tip projecting from the tip end face of the tool body is provided on the outer periphery of the tip end of the disc-like tool body. In a throw-away type cutting tool that is attached so as to be movable in the axial direction of the tool and fixed by a wedge at a desired position, an adjusting screw is provided between the tool body and the tip end side of the throw-away tip. Mounted on the adjusting screw so as to be retractable in a substantially radial direction, and the adjusting screw is provided with a contact portion for a throw-away tip having a peripheral surface coaxial with the adjusting screw, and the contact portion is in contact with the throw-away tip. The abutted surface on the opposite tip side of the tip is formed obliquely with respect to the axial direction of the adjustment screw, so the tip ejection according to the tightening amount of the adjustment screw is subtle. One can be precisely performed. Also,
If the tool body is formed with a fitting portion in which the adjusting screws are slidably fitted at a plurality of spaced positions, the swinging of the adjusting screw is restricted, and the force other than the tightening or pulling operation is not transmitted to the tip. Precise shaking can always be performed stably.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a front milling cutter that is an embodiment of the present invention.

FIG. 2 is an enlarged view of part P of FIG.

FIG. 3 is a view taken in the direction of the arrow Q in FIG.

FIG. 4 is a view taken in the direction of the arrow R in FIG.

[Explanation of symbols] 1 Face milling machine (throw-away type cutting tool) 2 Tool body 3 Throw-away tip 3b Tip contact surface 4 Wedge 5 Screw 11 Tip mounting seat 12 Wedge mounting groove 22b Abutment portion 25 First fitting Mating part 26 Second mating part

Claims (2)

[Claims] 1. A throw-away tip projecting from the tip surface of the tool body is provided on the outer peripheral portion of the tip of the disk-shaped tool body.
In a throwaway type cutting tool that is attached so as to be movable in the axial direction of the tool body and fixed by a wedge at a desired position, between the anti-tip side of the throwaway tip and the tool body, an adjusting screw, While being mounted so as to be able to project and retract from the outer peripheral surface of the tool body along a substantially radial direction, the adjusting screw is provided with a contact portion for a throw-away tip having a peripheral surface coaxial with the adjusting screw, The throw-away cutting tool, wherein the abutted surface on the side opposite to the tip of the throw-away tip with which the abutment portion abuts is formed obliquely with respect to the axial direction of the adjusting screw. 2. A throw-away type cutting tool, wherein the tool body is formed with fitting portions into which the adjusting screws are slidably fitted at a plurality of spaced apart positions.