A commutator processing technology and the mold used therein

Abstract

The invention relates to the technical field of commutators, in particular to a processing technology for a commutator as well as a die used therein. The processing technology for the commutator comprises the following steps: manufacturing a copper shell, and moulding one annular graphite sheet matched with the copper shell, wherein the copper shell comprises a plurality of contacts which are uniformly arranged at intervals along the periphery of the copper shell; connecting the copper shell with the graphite sheet together; placing into an extrusion moulding die and performing extrusion moulding, thus a semi-finished product is obtained, the semi-finished product comprises a commutator upper matrix located at the upper parts of the contacts and a commutator lower matrix located at the lower part of the commutator upper matrix, and the contacts are distributed outward along positions, close to the commutator upper matrix, of the commutator lower matrix; forming a groove used for preventing bakelite of an excircle of the graphite sheet from being cracked in the outer wall of the periphery of the commutator lower matrix; and performing heat treatment on the semi-finished product, andthen performing finish machining, thus the commutator finished product is formed. By virtue of the processing technology provided by the invention, the technical problems that the bakelite of the excircle of the graphite sheet of the commutator can be cracked easily in a heat treatment process and yield is influenced are solved.

Description

technical field [0001] The invention relates to the technical field of commutators, in particular to a commutator processing technology and a mold used therefor. Background technique [0002] The commutator is an important component of the armature of DC motors and AC commutator motors. When the motor rotates, it plays the role of commutation. It is a component on DC motors and AC series motors used as current commutation in order to allow the motor to continue to rotate, commonly known as a commutator. As an indispensable and important basic equipment in industry, transportation, national defense and daily life, the motor's downstream industries include almost all basic industries of the national economy. As one of the core components of the motor, the commutator is also growing with the development of the motor industry. [0003] The commutator in the prior art usually consists of a copper shell at the top, an annular graphite sheet at the bottom of the copper shell, an...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the commutator in the prior art is likely to cause the outer circle bakelite of the annular graphite sheet of the commutator to crack during the heat treatment process, thus affecting the normal use of the commutator and other components , so as to provide a commutator processing technology and a mold used in the heat treatment process that can avoid the cracking of the outer circular bakelite of the annular graphite sheet of the commutator, ensure the quality of the commutator, and improve the yield

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