SU1593770A1 - Tool for hardening gear wheels - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to a tool for the electromechanical processing of gears, and can be used to strengthen the working profile of bevel gears. The purpose of the invention is to improve the quality of the hardening of the toothed profile by providing the possibility of guaranteed contact and a given force in the engagement of the tool with any part of the processed profile. The tool contains two or more working profiles, segment-wise located on its conical surface, current source and electrical contact devices. The tool has an intermediate tooth, which is the first tooth of one section and the last for the next section. Hardening is carried out sequentially. The first to work can enter any profile tool. The cycles are repeated until the entire width of the hardened gear is processed. This allows for improved contact strength and durability. 2 Il.

Description

The invention relates to the processing of metals by pressure and can be used to harden the working profile of bevel gears by surface plastic deformation.

The purpose of the invention is to improve the quality of processing by increasing the current density along the entire tooth length of the wheel being machined and increasing the specific pressures.

Figure 1 shows the tool; figure 2 - processing scheme.

The tool contains a conical wheel 1. which has toothed sections 2-4. On each section profile there are reinforcing teeth 5-15, which ensure the strengthening process, as well as intermediate teeth 16, which ensure the continuity of the treatment process, one part of which is the first tooth of one section and the other part the last tooth of the other section. The sections themselves are located on a spiral.

The number of strengthening teeth should correspond to the number of teeth of the strengthening gear, but there may be more. In this case, part of the hardened teeth is processed twice. The length of the tooth in each section is maximally half the length of the tooth 16.

The hardening of the gear profile is carried out sequentially, and any tool profile can enter the work first. In the contact zone, a predetermined force is created, and electric current is supplied to the tool 1 from the current source 17 through the electrical contact devices 18 and 19 and the part 20. After disengaging one profile, it enters into operation.

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following. The cycles are repeated until the entire width of the hardened gear is processed. Due to the fact that the width of the hardened rim during sequential processing is significantly reduced, the proposed scheme provides a guaranteed contact of the tool with the entire part profile, which allows to ensure the specified specific pressure and density uniform hardening of the processed, profile.

The application of the proposed tool allows to significantly improve the quality of the machined wheels, including their bending and contact strength, as well as the durability of the work.

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An inventive tool for hardening gear wheels, comprising a conical wheel with a gear profile in the form of sections and a crown of single-pair gearing, a current source and electrical contact devices, characterized in that in order to improve the quality of processing by increasing the current density along the entire tooth length of the machined wheel and increasing specific pressures, the sections are arranged in a spiral, with an intermediate tooth between the adjacent sections, one part of which is the first tooth of one section, and the other part Th - last tooth of the other sections, the tooth length in each section is at most half the length of the intermediate tooth.

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Fig, 1

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Claims (1)

Claim A tool for hardening gears, comprising a bevel with a gear profile in the form of sections and a single-pair engagement rim, a current source and electrical contact devices, characterized in that, in order to improve the quality of processing by increasing the current density along the entire tooth length of the machined wheel and increasing specific pressures, sections are arranged in a spiral, with an intermediate tooth located between adjacent sections, one part of which is the first tooth of one section, and the other part is the last tooth goy sections, the tooth length in each section is at most half the length of the intermediate tooth. C 5 ... 15 figure 1 Editor A. Shandor Compiled by S. Chukaev Tehred M. Morgenthal Corrector A. Obruchar Order 2792 Circulation 460 'Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.