JPH0886Y2 - Throw-away tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention mainly relates to a throw-away type bite for scraping off the bead portion of a steel pipe or the like.

[Conventional technology]

Generally, in a throw-away type bite in which a throw-away tip is attached to the tip of the bite body, when the throw-away tip is attached to the bite body, a so-called clamp-on method, in which the throw-away tip is pressed by a clamp piece, or A so-called screw-on method in which a clamp screw is inserted into a mounting hole of a throw-away tip and fixed to a tool body is widely used (see Japanese Utility Model Laid-Open No. 60-127803).

[Problems to be solved by the device]

However, in the above-mentioned conventional clamp-on type cutting tool, since the clamp piece projects from the rake face of the throw-away tip, there is a problem that chips generated during cutting are disturbed by the clamp piece and cannot be discharged smoothly. is there.

Moreover, if the above-mentioned conventional screw-on method is adopted,
In addition to the head of the clamp screw becoming an obstacle when discharging chips,
In particular, in the cutting tool that scrapes off the bead that occurs during welding of steel pipes, etc., the tip of the throw-away tip (cutting edge) is sharply pointed, and therefore the tip of the tool body is also sharp, so the tool itself There is a risk that the clamp screw, which is screwed into, will be less engaged, and cannot be fully fixed.

The present invention has been made in view of the above circumstances, and an object thereof is to smoothly discharge chips even when a viscous portion using heat such as a bead portion generated when welding a steel pipe or the like is scraped off. Another object is to provide a throw-away type bite capable of firmly attaching the throw-away tip to the tool body.

[Means for solving the problem]

In order to achieve this purpose, the throw-away type bite according to the present invention is a throw-away type insert in which a rectangular flat plate-shaped insert with a cutting edge composed of a rake face and a front face is attached to the tip of the tool body. In the away type bite, the throw-away tip is seated on the tip mounting seat of the tool body and one side surface, the lower surface and the rear surface are in contact with each wall surface, and the other side surface is screwed to the tool body. It is pressed and fixed by the wedge member, and the screw is tilted by a predetermined angle to the tip side with respect to the direction orthogonal to the rake face of the throw-away tip, and is screwed onto the upper surface of the wedge member. It is characterized in that it is pressed in the plane direction.

[Action]

According to the above configuration, the wedge member attached from the rake face side of the throw-away tip can firmly clamp the both sides of the throw-away tip by sandwiching it between the abutting wall surface and the wedge member being inclined. Since the screw-in screw pulls the tip away from the tip end side toward the base end side, the throw-away tip is pressed and fixed in the side surface direction and the base end direction, so that the tip is more securely held.

The rear surface of the chip is pressed against the wall surface of the chip mounting seat or the wall surface of the spacer.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

1 to 6 show an embodiment of the present invention, in which the reference numeral 1 is a tool body. The tool body 1 has a pair of side surfaces 1b and 1c that intersect each other at right angles to the lower surface 1a and are formed in parallel with each other.
In the meantime, an upper surface 1d that is inclined downward toward one side surface 1b is formed, and a tip inclined surface 1e that is inclined upward toward the tip is formed at the tip of this upper surface 1d, and the tip inclined The front surface 1g, which is continuous with the surface 1e via the chamfered portion 1f, is the first front surface portion on the side surface 1b side that intersects the lower surface 1a at an obtuse angle.
1h, a second front surface portion 1i on the side surface 1c side that intersects the lower surface 1a at an obtuse angle smaller than the angle formed by the first front surface portion 1h and the lower surface 1a, and a connecting surface that connects these front surface portions 1h, 1i On the other hand, the base end portion is a shank portion 1k. Then, from the tip inclined surface 1e of the tool body 1 to the first front surface portion 1h
A tip mounting seat 10 is formed over the upper part of the upper surface, and a wedge mounting recess 11 is formed laterally in communication with the chip mounting seat 10 and a spacer mounting recess 12 is formed on the base end side.

The throw-away tip (hereinafter referred to as a tip) 2 attached to the tip mounting seat 10 is formed in a rectangular flat plate shape and is a rake surface, and the top surface 2a and the tip mounting seat 10
And a lower surface 2b placed on the bottom surface 10a of the same are formed in parallel with each other. Then, between the upper surface 2a and the lower surface 2b, a front surface 2c that intersects the upper surface 2a at an acute angle, a pair of side surfaces 2d, 2e that intersects the upper surface 2a at a right angle, and a rear surface 2f that intersects the lower surface 2b at an acute angle.
Are formed, and an edge portion formed by the upper surface 2a and the front surface 2c and an edge portion formed by the lower surface 2b and the rear surface 2f are cutting edges 3, respectively. The side surface 2d of the chip 2 is in contact with the side wall surface 10b of the chip mounting seat 10.

The wedge 4 mounted in the wedge mounting recess 11 has an upper portion of one side surface 4a thereof abutting the side surface 2e of the chip 2, and the other side surface 4b of the wedge 4 mounting side wall surface of the wedge mounting recess 11. A screw hole 4e is formed from the upper surface 4c to the lower surface 4d, which is in contact with 11a and is inclined at an angle α with respect to the direction orthogonal to the upper surface 4c in FIG. And this screw hole
4e and the screw hole 11b formed in the wedge mounting recess 11
Then, the clamp screw 5 is screwed in with its axis line 1 parallel to the second front face 1i of the tool body 1, whereby the wedge 4 is fixed to the tool body 1.

Spacer 6 to be mounted in the spacer mounting recess 12
The front surface 6a is in contact with the rear surface 2f of the chip 2, and the pair of side surfaces 6b, 6c, the lower surface 6d, and the rear surface 6e are respectively the pair of side wall surfaces 12a of the spacer mounting recess 12. ,
12b, the bottom surface 12c, and the rear wall surface 12d are arranged to face each other, and penetrate from the upper surface 6f to the lower surface 6d, and the upper surface.
A through hole 6g is formed from 6f to the lower surface 6d. Then, the through hole 6g and the spacer mounting recess
The spacer 6 is fixed to the tool body 1 by attaching the mounting bolt 7 to the screw hole 12e formed in the screw 12.

In the throw-away tool constructed as described above, the tip 2, the wedge 4 and the spacer 6 are installed in the tip mounting seat 10, the wedge mounting recess 11 and the spacer mounting recess 12 of the tool body 1, respectively. Then, the clamp screw 5 holds the wedge 4, and the mounting bolt 7 holds the spacer 6.
To the tool body 1. As a result, the rear surface 2f of the chip 2 is pressed by the upper part of the front surface 6a of the spacer 6, and the side surface 2e of the chip 2 is pressed by the upper part of the side surface 4a of the wedge 4, so that the chip 2 is firmly attached to the tool body 1. . In this case, the clamp screw 5 for attaching the wedge 4 to the tool body 1 is pulled in the proximal direction of the tool body 1 by screwing the axis l of the second front surface portion of the tool body 1 into the tool body 1. Accordingly, the tip 2 is also pressed in the base end direction of the tool body 1.

Further, when the bead 20 formed in the longitudinal direction of the steel pipe P is scraped off by the throw-away tip 2 having the above structure, the steel pipe P is fed in the direction of the arrow as shown in FIG. As a result, the bead 20 is smoothly scraped off by the cutting blade 3 of the chip 2, and the chips 21 are spirally discharged along the upper surface 2a of the chip 2. In this case, since there are no obstacles on the upper surface (rake surface) 2a of the chip 2, the chips 21 smoothly flow and extremely excellent workability can be obtained.

It should be noted that, in the above-described embodiment, the structure in which the rear surface 2f of the tip 2 is received by the spacer 6 has been described, but it may be received directly by the tool body 1 without using the spacer 6. Further, as shown in FIG. 7, a tip 30 having one cutting edge 3 may be used.

[Effect of device]

As described above, according to the throw-away type cutting tool according to the present invention, the throw-away tip is seated on the tip mounting seat of the tool main body and one side surface, the lower surface and the rear surface thereof are respectively in contact with the respective wall surfaces. , The other side surface is pressed and fixed by a wedge member screwed to the tool body, and the screw is inclined at a predetermined angle to the tip side with respect to the direction orthogonal to the rake face of the throw-away tip, and the upper surface of the wedge member Since the throw-away tip is pressed in the rear surface direction by being screwed in, the throw-away tip can be pushed in the lateral direction and the base end (rear surface) direction only by pressing and fixing the throw-away tip from the other side by the wedge member. It can be pressed firmly against and to be firmly clamped. Moreover, when attaching and detaching the throw-away tip and the wedge member, it is easy to work from the rake face side of the throw-away tip, and since there are no obstacles such as clamp members on the rake face of the insert, the chips are smooth when cutting. Can be discharged to.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention.
1 is a plan view, FIG. 2 is a side view, FIG. 3 is a front view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 is a line VV in FIG. 6 is a sectional view showing the cutting state, and FIG. 7 is a sectional view showing another embodiment of the present invention. 1 ... Tool body, 2 ... Indexable insert (tip), 2a ... Top surface, 2b ... Bottom surface, 2c ... Front surface, 2d, 2e ...
… Side, 2f …… Rear, 3 …… Cutting edge, 4 …… Wedge, 6…
… Spacer, 10 …… Chip mounting seat, 10b …… Side wall surface, 30
...... Chip.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroaki Hayashizaki Inventor Hiroaki Hayashizaki 1-27-20 Nishi-Shinagawa, Shinagawa-ku, Tokyo Mitsubishi Metals Co., Ltd. Tokyo Works (56) Bibliography 60-97205 Kai 56-67902 (JP, U) Actual public 55-53284 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A throw-away type bite, in which a throw-away tip in the form of a quadrangular plate having a cutting face composed of a rake face and a front face is attached to the tip of a tool body, wherein the throw-away tip is It is seated on the tip mounting seat of the tool body and one side surface, the lower surface and the rear surface are in contact with each wall surface, and the other side surface is pressed and fixed by a wedge member screwed to the tool body. The throw-away tip is pressed in the rear surface direction by being screwed onto the upper surface of the wedge member at a predetermined angle to the tip side with respect to the direction orthogonal to the rake face of the throw-away tip, and the screw is screwed into the upper surface of the wedge member. Throw away type bite characterized by that.