RU1814979C - Cutting tip - Google Patents

Abstract

Usage: in tools for metalworking, in particular in cutting inserts of prefabricated cutters. The cutting insert contains convex and concave curved cutting edges along which chip breaking grooves are made, a supporting surface with a fixing element, side faces with rear angles. The concave cutting edge is opposite to the convex, moreover, they are located in the same plane and are made with the same radius of curvature. A closed groove is made between the edges to secure the plate. 11 ill.

Description

FIELD OF THE INVENTION This invention relates to metal processing tools, in particular to pre-cutter cutting inserts.

The aim of the invention is to expand the technological capabilities of the plate,

 Figure 1 shows a side view of the plate; figure 2 is the same, a top view; in Fig.Z - view of. arrow A in figure 1; figure 4 is a view along arrow B in figure 1; Figure 5 is a section bb in figure 2; figure 6, figure 7 - plate with a different shape of the supporting surface; on Fig - installation of the plate when processing a convex surface; figure 9 is the same, a top view; on Fig. - installation of the plate when processing a concave surface; in FIG. 11 is the same, top view.

The cutting insert has a sickle-shaped profile with two cutting edges 1, 2. A convex cutting edge 1 is outlined by RHap. A concave cutting edge 2 is delineated by RBH. moreover, RHap RBH. The plate has side edges 3 with rear corners. On the front surface of the plate along the cutting

chip-breaking grooves 5 are located between the edges, between which there is a closed V-shaped groove 6 for securing the plates with a grip on the tool body. To fix the plate from displacement in the transverse direction, the supporting surface of the plate 4 can be made flat with a groove 7, or flat with a protrusion 8 or V-shaped (Fig. 7). The ends of the plate 9 are flat perpendicular to the supporting surface.

The plate is mounted in the toolholders as follows. When processing a convex profile, the plate is based on the supporting surface 4, by the abutting ends 9 and secured by tacking the right wall of the V-shaped groove 6. When machining a convex profile, the plate is based on the supporting surface 4, keyway and back surface 3 and is attached by the tack to the left wall grooves 6. The grip screw presses the plate vertically against the holder and horizontally against the abutment surface.

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The concave surface is machined by the cutting edge 1 (Fig. 2) of the insert, and the convex surface is machined by the cutting edge 2. In both cases, with a radial feed of the cutter. The interaction of the cutting edges with the workpiece and fixing the plate in the groove of the holder shown in Fig.8-11. Namely, Figs. 8, 9 show a part of a convex shape 9 and a cutter consisting of a holder 10, a cutting insert 11, a stick 12. of a screw 13.

In Fig. 10, 1 T shows a holder 10, a cutting insert 11, a gripper 12, a screw 13, a concave shape part 14.

Using a cutting insert of the claimed design will allow:

treat concave surfaces of sizes exceeding the radius of the cutting edge of the insert;

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treat the convex-concave surfaces of the mating parts without replacing the cutting insert.

Claims (1)

SUMMARY OF THE INVENTION A cutting insert comprising a convex curvilinear cutting edge on the outside and lateral faces with rear angles, on the front surface of which chip breakers and a groove are provided for securing, and a locking element is made on the supporting surface, without being cut. the fact that, in order to expand technological capabilities, the cutting edge is concave on the opposite convex cutting edge, and the cutting edges are concave and convex in the same plane and are made with the same radius of curvature, and the groove is closed and located between the chipbreakers. 1 h C (pu $ .t ff (pit. 5. 8iJaA fffgj rig.7