Cold Heading Technology of Groove Commutator Segment

Abstract

The invention discloses a groove type commutator bar cold heading technology. A commutator bar workpiece is composed of a bar body and a bonding wire step, wherein vertical grooves are arranged on left and right of the bar body, and is characterized in that the forming process comprises the following steps of: 1, a primary cold heading process, wherein the head portion of the section bar is primarily headed to be flat; 2, a secondary cold heading process, wherein the head portion of the section bar is secondarily headed to be flat, and positioning grooves are headed out on the left and right sides of the bar body; 3, a third cold heading process, including taking the positioning grooves as positioning references, heading the head portion of the section bar to be flat for the third time, forming bonding wire steps, forming the bar body, and extending top heights of the positioning grooves upwards; 4, a fourth cold heading process, wherein the positioning grooves are taken as positioning references, the workpiece is extruded into a mold cavity from the top down and exits from the discharge hole at the bottom of the mold cavity, the top portions of the positioning grooves upwards penetrate through the top portion of the bar body, vertical grooves are formed, and meanwhile the mold cavity is provided with a shaping hole for shaping the bar body and the bonding wire steps. The groove type commutator bar formed by the cold heading technology is level and free of warping in bar body, high in shaping precision, and improved in quality.

Description

technical field [0001] The invention relates to the technical field of commutator manufacture, in particular to a cold heading process for a commutator segment of a grooved commutator. Background technique [0002] Commutators are divided into three types: hook-type commutator, slot-type commutator and end-face commutator. For traditional slot-type commutators, the commutator segment is usually composed of a piece body and a welding line step on the top of the piece body. , L-shape between the chip body and the welding wire step. 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 th...

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 welding wire step will first leave the mold cavity. Due to the stress, the overhanging end of the welding wire step will bow down, causing the back of the sheet The inner surface of the body) is bent, which will seriously affect the quality of the slot commutator produced

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