SU942913A1 - Built-up hobber - Google Patents

Description

one

The invention relates to metalworking, namely to metal-cutting tools for cutting cylindrical gears.

Known to metal; A common tool is a screw-driver, consisting of a body and non-reversible diamond-shaped plates, installed under a negative rake angle and. having different profile angles of cl.

The disadvantages of this design are small values of the back angles in the sections of the profile of the teeth having smaller profile angles, which negatively affects the durability of the cutter.

The purpose of the invention is to increase tool life.

This goal is achieved by the fact that in a worm-hole team cutter consisting of cutting elements installed in the housing grooves at negative front corners, the cutting elements are flush alternating at different negative angles, with elements set at a large negative angle having a smaller profile angle.

As a result of the positioning of the cutting elements with a smaller profile angle at a large negative rake angle, almost the same values of the side rear corners can be achieved at all sections of the profile.

This circumstance is one of the main conditions for uniform wear of the tool during its operation.

In order to improve the quality of machining, the cutting elements are made in such a way that sections of cutting elements with large profile angles overlap in height in the axial plane straight sections of cutting elements with smaller profile angles.

FIG. 1 shows the cutter, a general view; in fig. 2 is a view A in FIG. in fig. 3 enlarged tooth profile

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(node I nz Fig. 1; Fig. 4 - view B in Fig. 2.

The milling cutter includes a housing 1 and cutting elements 2 and 3.5 alternating in the circumferential direction

The cutting elements 2, having a smaller profile angle) - | 7d., Are located in the housing 1 under a large negative rake angle y, and the cutting elements 3 with a larger profile angle Srp (located in the housing at a lower negative angle Vq,

In order to ensure the quality production of the product, the cutting elements 3 with a large profile angle is PL 1 so that their vertex cutting edges with respect to the line B, on which the interface points of two adjacent profiles are, go over each other at a distance H equal to 0.5-0.8 mm.

The total height of the working section of the profile of a worm cutter is determined by the size H, which is calculated by 5 using known formulas.

Using the proposed technical solution, it is possible to obtain optimal lateral angles along all cutting edges, the profile angles of which are different, which results in a smaller width of the chamfer of the cutting edges, and hence less forces on the rear surface. Specified %%:%:% d; ;%:::; ; :

four

These factors lead to an increase in the durability of cutting elements of carbide, worm mills with a new geometry by a factor of three.

Claims (2)

1. Worm prefab, in the longitudinal grooves of the casing of which, under negative front corners, cutting elements are fixed, having straight working sections with different profile angles, about which, in order to increase tool life, the cutting elements are arranged with alternation at different negative angles, and the elements installed at a large negative angle have a smaller profile angle. 2. The milling cutter according to claim 1, so that in order to improve the quality of processing, the cutting elements are made so that their sections with large profile angles overlap in height in the axial plane the straight sections of the cutting elements with smaller profile angles. Sources of information taken into account in the examination 1. Krinzberg I. 3. et al. Gear milling with carbide mills. Metal-cutting and measuring instruments, No. 9,. FIG. It