RU1808480C - Cutting tool - Google Patents

Abstract

It is used in metalworking, namely in a cutting tool. SUMMARY OF THE INVENTION: The holder comprises a socket for a cutting insert. The surface of the nest and cutting insert is made in the form of spherical segments. The fasteners are made in the form of two two-shouldered levers of a L-shaped form. A cruciform groove is made on the surface of the spherical segment of the cutting insert. The groove wall and screws are designed to interact with the shoulders of the two-arm levers. The second shoulders of the levers are placed in the grooves of the holder. 6 ill.

Description

The invention relates to metalworking, in particular to a metal cutting tool.

The purpose of the invention is to improve the quality of the treated surface.

In FIG. 1 shows the proposed cutting tool in the intermediate position of the two-arm levers during assembly, axonometric; in FIG. 2 - a cutting insert; in FIG. 3 is a view A in FIG. 1 when securing a cutting insert with a positive rake angle + y, in FIG. 4 is a section BB in FIG. 1 when securing a cutting insert with a positive rake angle + y, in FIG. 5 is a view A in FIG. 1 when fixing the cutting insert with a negative rake angle - y; in FIG. 6 is a section BB in FIG. 1 when fixing the cutting insert with a negative rake angle -y.

The cutting tool consists of a holder 1, two shoulders levers L-shaped 2, cutting, plate 3 and push

screws 4 located in the threaded holes of the holder. The two-arm lever 2 is L-shaped and placed in the groove 5 of the holder, with the top of the lever resting on a rod 6 mounted in a through hole made in the holder 1.

The cutting insert 3 is made in the form of a spherical segment.

The base of the spherical segment is the front surface 7 of the insert, and the convex surface of the ball is the rear surface 8. The intersection line of the base of the spherical segment 7 and the convex surface of the ball 8 is the cutting edge 9 made in the form of a circle. The cutting insert comprises a cruciform groove 10, the normal to which is the axis of the cutting insert. The cutting insert is mounted in the seat 11, the concave surface of which is identical to the convex surface 8 of the ball segment.

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When assembling the cutting tool, the levers 2 are inserted into the grooves 5 of the holder 1 so that the shoulder of the lever 2 fits into the neck of the screw 4 (not shown). After that, the rod 6 is inserted into the through hole of the holder. Then, using the screws 4, the arms of the levers 2, the interaction with the cutting insert 3 are combined with the axis of the socket 11 (Fig. 1). After that, the cross-shaped groove 10 of the cutting insert 3 is combined with the arms of the levers 2 and the cutting insert 3 is lowered down to the stop of its surface 8 in the concave surface of the socket 11.

The clamping of the cutting insert 3 is carried out by tightening the pressure screws 4, the successive movement of the arms of the levers 2, by sequentially tightening the pressure screws 4, allows you to set the cutting plate 3 in the holder 1 with a different angle of inclination of the cutting edge I and the rake angle y (positive + y, zero at 0, negative at y (Fig. 4, 6). The size of the rear angle a. depends on the size of the front angle y and the radius of the spherical segment.

After blunting the cutting edge 9, the insert is reinstalled or regrind along the front surface 7.

The implementation of the invention allows to significantly expand technological possibilities .8 .. 9

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the capabilities of the cutting tool due to the versatility of the cutting insert, which allows it to be used in a wide range of cutting conditions when machining various grades of steel and alloys - a machine with a different rake angle, with left and right feeds.

In addition, such a design of the cutting insert upon failure of the entire cutting edge provides its regrinding along the front surface,

Claims (1)

SUMMARY OF THE INVENTION A cutting tool comprising a holder with a socket for a cutting insert and fasteners with screws, the socket in the holder and the surface of the cutting insert designed to interact with it, are made in the form of spherical segments, characterized in that, in order to improve the quality of processing by improving accuracy adjusting the cutting angles, fasteners are made in the form of two two-shouldered levers of the L-shaped form, and a cross-shaped groove is made on the surface of the spherical segment of the cutting insert, with that the wall of said groove and screws are designed to interact with the shoulders of two-armed levers, a second arm which are placed in grooves formed in the tool holder. 6 FIG. / FIG 3 6-6