Powder metallurgy start chainwheel and gear

Abstract

The invention discloses a powder metallurgy start chainwheel and gear. The chainwheel and gear are pressed and formed at a time by the powder metallurgy process, and comprise the following raw materials in percentage by weight: 95.5-98% of iron, 0.3-1.2% of carbon, 0.7-2% of copper, 0.1-0.5% of manganese sulfide and 0.3-1.2% of zinc stearate. In the invention, the traditional manufacturing process is replaced by the powder metallurgy technology so as to save cost for the traditional enterprises. The powder metallurgy has high degree of mechanization, saves materials, lowers cost, reduces manpower and material resources and improves efficiency and tooth profile accuracy.

Description

technical field [0001] The invention relates to a powder metallurgy structural part, in particular to a powder metallurgy starting sprocket and a gear. Background technique [0002] The existing starting sprocket and gear are originally made of S45C steel, and then the tooth profile of the sprocket is milled, and the splines in the inner hole are processed by wire drawing. This method wastes material, manpower and material resources, has low efficiency, poor precision and high cost. [0003] For example: the blanking weight of the steel part is 1.47kg, and the finished product is only 0.23kg, which means 1.24kg is wasted. The unit price of materials is ￥6 / kg, and this alone is a waste of ￥7.44 / kg. [0004] Manual milling can only mill about 50 pieces per day, and about 300 pieces of wire-drawn splines. The efficiency is low, and it cannot meet the mass production of customers at all, and because it is manual operation, it leads to poor precision, high scrap rate, and wast...

AI Technical Summary

Problems solved by technology

The efficiency is low, and it cannot meet the mass production of customers at all, and because it is manual operation, it leads to poor precision, high scrap rate, and waste, etc.

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