Middle shaft for electric bicycle and machining process of middle shaft

Abstract

The center shaft for the electric bicycle comprises a center shaft body, the center shaft body is provided with a frame mounting portion, fluted disc fixing portions, prism-shaped structures and frustum structures are arranged on the two sides of the frame mounting portion, each side face of each frustum structure is a slope-shaped face, a slope angle theta is formed between each slope-shaped face and the center axis of the center shaft body, and the fluted disc fixing portions, the prism-shaped structures and the frustum structures are arranged on the center shaft body. The invention further provides a machining process of the center shaft for the electric bicycle, cutting loss is avoided in the machining process, the material utilization rate is increased, light weight of products is achieved, raw materials are saved, the production cost is reduced, the original phosphorus saponification treatment procedure of the surface polluting the environment is omitted, the machining period is shortened, and the machining efficiency is improved. And the production efficiency is improved, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a central axle for electric bicycles and a processing technology thereof. Background technique [0002] Energy saving, consumption reduction, cleanliness and environmental protection have increasingly become the focus of attention of the whole society. Many complex processes are changing to simple and convenient processes. Lightweight technology has gradually become one of the main development technical directions of the electric bicycle industry. Higher requirements are put forward; the central axle is installed at the bottom of the frame to connect the rotating parts of the left and right cranks; the traditional manufacturing process is: raw materials - turning bosses - phosphating saponification - cold extrusion molding - extrusion molding - slotting - Thread rolling - heat treatment - surface treatment. [0003] The existing process has the following shortcomin...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem of poor quality stability of the center shaft due to the cumbersome and complicated process in the manufacturing process of the electric vehicle center shaft in the prior art and the need for repositioning due to continuous sequence transfer, resulting in poor quality stability of the center shaft, low product precision, long processing time, and labor costs. High; and the utilization rate of turning process materials is not high, and there are problems of environmental pollution in the intermediate process

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