JPS6026883Y2 - Cutting tools - Google Patents

Description

[Detailed description of the invention] The invention provides a cutting tool, in particular an insert, which is fixed to a tool holder by means of a clamping device, and the clamping device is screwed into a suitable lever-like body and the tool holder.
This relates to a parting tool consisting of two screws.

The main feature of the invention is that the clamp body is recessed relative to the insert.

This is to prevent chips cut by the insert from coming into direct contact with the clamp body.

In conventional cutting tools of the type mentioned above, the arm-like body of the clamping device is designed to be relatively large and to project somewhat beyond the insert, so that there is a gap between the clamp body or the nose of the clamp body and the seat of the insert. Attach the insert to the

In this case the clamp body acts as a chip breaker.

That is, the cutting waste separated or removed from the workpiece by the insert is guided to the clamp body and crushed by the clamp body.

However, this has proven to be a disadvantage since the cuttings become very hot while being separated from the workpiece.

As a result, when the cutting chips are in direct contact with the clamp body, the clamp body is exposed to thermal stress and can be deformed or destroyed.

The present invention has been made to eliminate the drawbacks of the prior art described above, and is a cutting tool consisting of a tool holder, an insert, and a clamp device that fixes the insert to the tool holder, in which the clamp body is retracted from the insert. The purpose of the present invention is to provide a cutting tool with an improved configuration.

By retracting the clamp body relative to the insert in accordance with the principles of the invention, the risk of the tip coming into direct contact with the clamp body and creating thermal stresses in the clamp body is eliminated or reduced.

Next, embodiments of this invention will be described in detail with reference to the accompanying drawings.

In Figs. 1 to 3, reference numeral 1 indicates a tool holder, to which an insert 2 is removably attached.

To secure the insert 2 to the tool holder,
A clamping device 3 is provided.

This clamp device 3 includes a lever-like main body 4 and a clamp screw 5.
Consisting of

This clamp screw is screwed into a screw hole 6 of the tool holder 1 and passes through a hole 7 of the clamp body.

The hole 7 and therefore the screw 5 are also arranged at a certain distance from the projection 8 on the underside of the clamp body 4.

The face-cutting tool holder 1 forms a narrow tip portion that protrudes from one of two parallel side wall surfaces in the longitudinal direction, and the front surface of this tip portion faces rearward from the top to the bottom. The upper surface behind the upper edge of the front surface is sloped to form a recessed floor part 12 that gradually becomes deeper from the front to the rear. In this case, both sides shall be open, but the part following this shall be formed so that only one side is open. A recess 1 defined by side walls that are continuous with each other.
1 constitutes a clamping device and a supporting part of the insert 2, and the insert 2 is attached to the protrusion at the tip of the holder 1.
The clamp device 3 is attached to the rear of the clamp body 4, and the upper surface of the clamp body 4 is gradually inclined downwardly from the front to the rear, and the lower surface of the nose 20 is aligned with the recessed step 19 of the insert and is tilted upward. Further, the bottom protrusion 24 and the rear lower surface of the main body 4 following this are made parallel to the floor surface of the holder 1, and there is a gap that gradually slopes downward, so that the lower end of the recess 11 has the clamp main body 4 The small protrusion 8 on the lower surface of the rear end is set in the upper position.

When the screw 5 is then tightened, the head 9 of the screw rests on the concave seat 10 of the clamp body 4, and the clamp body 4 acts as a lever without protruding above the clamp body.

By doing so, the clamp body 4 firmly presses the insert 2 against the tool holder.

According to the principle of the invention, said lever-like clamp body 4 is recessed compared to the cutting edge of the insert 2 in order to prevent the cutting chips removed from the workpiece by the insert 2 from coming into contact with the clamp body.

The tool holder 1 in this particular embodiment comprises a recess 11 in which the insert 2 and the clamp body 4 are accommodated.

The bottom surface of this recess extends from a relatively deep point 13 below the top plane 14 of the tool holder 1 (innermost bottom point) to a point 15 located below the top plane 14 at a point considerably shallower than the depth of point 13. It extends diagonally.

This configuration places the insert 2 at a relatively high position relative to the clamp body 4.

The clamp body 4 has two distinct parts, namely a rear base part 16 whose top and bottom surfaces are parallel, and a top surface 18.
and a tip 17 which is somewhat arcuate, the upper surface 18 of the tip 17 converging in the direction of the insert 2.

One of the features of this invention is the recessed step 19 provided in the insert 2 to accommodate (or receive) the nose 20 of the clamp body 4.

In this way, the nose 20 of the main body 4 fits into the recessed step 19 of the insert, the upper surface 18 of the tip 17 converges toward the insert 2 as described above, and the floor 12 of the recess 11 Since it is inclined towards the tip, the upper surface of the clamp body (in this case the arcuate surface 18) which is the uppermost surface with respect to the floor 12 of the recess 11 is connected to the uppermost surface of the insert 2 and the rear wall of the recess 11. It is located below the imaginary plane connecting it to the upper edge 21' (see the upper broken line in FIG. 3).

Close to the rake face 22 of the insert 2 in this embodiment is a shoulder 23 which acts as a chip breaker.

The protrusion 24 provided on the lower surface of the tip of the clamp body 4 is a stopper that cooperates with the nose 20 of the clamp body to stop the insert 2, and the tightening of the insert 2 is performed by moving the body using the small protrusion 8 as a fulcrum. This is a lower surface protrusion that does not come into contact with the bottom surface of the recess 11 so as not to impede rotation.

According to this invention, the clamp body 4 is recessed relative to the insert 2 and the insert itself is provided with a chip breaker shoulder 23 so that chips removed from the workpiece do not come into direct contact with the clamp body. Become.

An already avulsed tip may make temporary contact with the clamp body, but cannot be pressed against and welded to the clamp body.

As described above, the present invention provides that the clamping devices provided for securing the inserts are recessed relative to the inserts, so that they are not exposed to troublesome thermal stresses that could deform and damage them; The present invention has the feature that the insert can be firmly fixed to the tool holder using a simple fixing means to the clamp device.

[Brief explanation of the drawing]

FIG. 1 is a side view of a cutting tool designed according to this invention. FIG. 2 is a plan view of the cutting tool shown in FIG. 1. Fig. 3 is an enlarged cross-sectional view and side view of the cutting tool shown in Fig. 1, Fig. 4 is a perspective view of the insert to be attached, and Fig. 5 is an enlarged configuration perspective view of the tip of the holder. It is. 1... Tool holder, 2... Insert, 3... Clamp device, 4... Clamp body, 5... Clamp screw, 6・・・・・・
・Screw hole, 7... Hole, 8... Small protrusion, 9...
...Screw head, 10...Concave seat, 11...
... recess, 12... floor, 14...
Top plane, 16° 17...Rear base portion of clamp body, tip, 18...Top surface of clamp body, 21...Rear wall of recess.

Claims (1)

[Claims for Utility Model Registration] (a) An insert 2 with a chip breaker shoulder 23 raised on the scooping surface rearward from the cutting edge and a recessed step 19 formed on the rear end thereof; b) A lever-shaped clamp body 4 with a clamp screw penetration hole 7 drilled in the vertical direction in the middle, with a tip portion 17 whose upper surface is an arcuate surface 18 sloping downward toward the tip, and a rear portion following the tip portion 17. There is a protrusion 24 on the lower surface of the tip 17.
(c) The clamp body 4 has a protruding nose 20 at its front part, and a small protrusion 8 formed on the lower surface of the rear end of the rear base part 16; A tool holder 1 having a substantially elongated rectangular parallelepiped shape formed in a narrow part that is common to one side and whose other end face is parallel to the one side, and a step part that is one step lower than the upper surface 14 is formed from the tip to the base; It slopes downward in the rear direction until it reaches the rear wall that stands upright on the floor 12 of the stepped section, and both sides are open at the tip of the mountain, and only one side continues to be open until the base, while the other side is open at the same time. A tool holder 1 is formed with a recess 11 defined by an upright wall, a rear wall, and a bottom, and a screw hole 6 is bored in the middle of the bottom. is installed, the nose 20 of the clamp body is engaged with the recessed step 19 of the insert, the small protrusion 8 on the rear end of the clamp body is engaged with the rear end of the bottom of the tool holder, and the clamp is inserted into the hole 7 of the clamp body. In this cutting tool, the screw 5 is screwed into the screw 6 of the tool holder 1, and the top of the clamp body is positioned below the imaginary plane connecting the cutting blade and the rear wall edge of the tool holder.