SU1465176A2 - Cutting bit - Google Patents

Abstract

The invention relates to metal cutting, in particular to jet cutters. The aim of the invention is to expand the technological capabilities of the cutting plate due to its use in the structures of cutting and grooving cutters and making different-height chip-forming elements, which ensures the bending of chips in cross section. On the front surface of the cutting plate, at some distance from the cutting edge, three chip-forming elements are made in the form of grooves with a segmented shape, and the height of the recesses is symmetrically reduced to the side of the cutting plate. During the cutting process, grooves form on the chips, it bends in cross section and decreases in 1 width. This causes the chips to curl into a compact, tight spiral. 6 Il. i (/

Description

one

The invention relates to metal cutting, in particular to cutting: cutters.

The aim of the invention is the expansion of the technological capabilities of the cutting plate due to its use in the structures of cutting and grooving cutters.

The goal is achieved by the fact that the implementation of chip-forming deforming elements with different height-heights ensures that the chip bends in cross section in the form of an arc of a large radius and a width less than the width of the groove cut.

Figure 1 shows the cutting re. Zec; figure 2 - section aa nafig.1 ;. on fig.Z - section bb in fig.1; figure 4 - section bb In Fig .; on

5 is a view of G in figure 1; figure 6 - cross section of the slice (chips.

The cutting cutter is provided with a cutting plate, on the front surface 1 of which, at some distance from the cutting edge 2, chip-forming elements 3, 4 are made in the form of depressions 5, 6 and 7 of segmental shape. Additional sharpening 8 intersects with the front surface through line 9 passing through the recesses. The recesses are made in different heights, the central recess 6 is made in height h, and the lateral 5 and 7 in height h. In this case, the height of the recesses is symmetrically decreasing (h, hj) toward the sides 10 and And of the insert.

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05

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During the cutting process, the converging chips 12 are deformed in the recesses and grooves 13 are formed on it. The formation of the grooves 13 is accompanied by a decrease in the width of the chip and its curvature, which leads to the curling of the chip into a compact tight spiral, which is freely retracted from the slotted groove, not damaging its walls,

The width a of the additional sharpening is chosen depending on the thickness of the cut chips and is approximately equal to it in size. The angle | b for additional sharpening is selected within tO-40, depending on the material being processed. The distance b from the cutting edge to the central groove is chosen by the smallest of all the possibilities of making the reversal and complete restoration of the front surface profile. This is ensured by choosing the distance b by the formula:

four

B b, - tgoi 4- (0.05-0.1),

where h is the allowable wear of the tool

rear edge; o - the back angle of the cutter.

from the depth selectable

but

The length of the greater width of sharpening

Claims (1)

Invention Formula Cutting plate on ed. St. No. 831393, in order to expand technological capabilities by using cutting and grooving cutters in the structures, the chip-forming deforming elements are made different in height with respect to the intersection line of the additional grinding with the front surface, and The deforming elements are symmetrically reduced to the sides of the plastic sheet. Al fae.2 fie.v in-c in-in if) uff.Z ig4 but / Phi.1.6