Commutation film production method

Abstract

The invention discloses a commutator segment manufacturing method which is characterized by comprising the following steps of a. a copper wire pulling process; b. a fixed-length shearing process; c. a first cold heading process, wherein a section head is subjected to pre heading flattening, meanwhile, hanging grooves are headed below the tops of the left side and the right side of a segment body, and the shapes and the positions of the hanging grooves are the same as those of segment grooves; d. a second cold hading process, wherein the hanging grooves are used as locating reference, the section head is subjected to heading flattening again, step forming is carried out, and meanwhile section body forming size is slightly larger than practical size; and e. a third cold heading process, the hanging grooves are used as locating reference, a workpiece is squeezed into a die cavity from top to bottom and goes out from a discharging opening in the front side of the bottom of the die cavity, so that the tops of the hanging grooves penetrate through the segment body upwards, segment groove forming is carried out, and meanwhile a shaping opening is formed in the inner wall of the die cavity to carry out shaping on the segment body and a step, so that the practical sizes of the segment body and the step are achieved. According to the commutator segment formed through the method, the commutator segment is flat and does not warp, forming accuracy is high, and the quality of a manufactured commutator is improved.

Description

technical field [0001] The invention relates to a method for manufacturing a commutator segment. Background technique [0002] Commutators are divided into three types: hook-type commutator, slot-type commutator and end-face commutator. The commutator segment of the traditional slot-type commutator is usually composed of a plate body and a step on the top of the plate body. There is an L-shape between the body and the steps. The production of the above-mentioned slot-type commutator segments uses a stamping process, but it will produce a lot of scraps, the utilization rate of copper materials is low, and the production cost is also high. The quality of the type commutator; there is an upsetting process, but because of the need for upper demoulding, the mold cavity must be designed to have a certain taper, which leads to the inclination of the left and right sides of the commutator after cold heading (that is, the upper Thick and thin, which is also a kind of warping and un...

AI Technical Summary

Problems solved by technology

The production of the above-mentioned slot-type commutator segments uses a stamping process, but it will produce a lot of scraps, the utilization rate of copper materials is low, and the production cost is also high. The quality of the type commutator; there is an upsetting process, but because of the need for upper demoulding, the mold cavity must be designed to have a certain taper, which leads to the inclination of the left and right sides of the commutator after cold heading (that is, the upper Thick and thin, which is also a kind of warping and unevenness). In addition, when demoulding, the steps will first leave the mold cavity. Due to the stress, the overhanging end of the steps will bow, causing the back of the sheet (that is, the inner surface of the sheet) ) produce bending, which will seriously affect the quality of the manufactured groove commutator

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