Automobile power steering pump powder metallurgy inner and outer rotor formula and preparation technology

Abstract

The invention discloses an automobile power steering pump powder metallurgy inner and outer rotor formula and preparation technology. The formula comprises the following components, by weight percentage, 92-95% of atomized iron powder, 0.6-1.2% of colloidal graphite, 1-5% of electrolytic copper, 0.5-3% of nickel powder, 0.5-3% of molybdenum powder, 0.1-0.6% of manganese sulfide, 0.1-0.6% of sulfur, 0.3-0.7% of micronized waxes, and 5-30ml / 100kg of spindle oil. The preparation technology comprises the following steps of ingredient preparing, powder mixing, compression molding, sintering and alloying, shaping and correcting, machining, steam treating and the like. Utilization ratio of materials is improved effectively, the surface roughness reaches 0.8-1.6Mum, the service life, accuracy class, safety performance of the power steering pump are improved effectively, and production cost is reduced.

Description

technical field [0001] The invention relates to a new formula of inner and outer rotors of an automobile power steering pump and a manufacturing process. Background technique [0002] The inner and outer rotors of the current automobile power steering pump are made of steel (45# steel, 40Cr, etc.) through machining. First of all, the composition of the steel is relatively fixed, the wear resistance is poor, and it is relatively easy to wear, and the head gap becomes larger, which leads to the direction of being unable to hit, which seriously affects driving safety. And it will also lead to a short service life. Secondly, the material utilization rate is low, and only about 60% of the raw materials are left after processing; third, the processing efficiency is low, only about 100 pieces per shift; fourth, the machining surface roughness is large, generally only reaching 3.2 μm; fifth , The processing size accuracy is low, the error is 0.03-0.05mm; Sixth, there are many proc...

AI Technical Summary

Problems solved by technology

First of all, the composition of the steel is relatively fixed, the wear resistance is poor, and it is relatively easy to wear, and the head gap becomes larger, which will cause the direction to be hit hard, which seriously affects driving safety.

It also leads to a short service life

Secondly, the material utilization rate is low, and only about 60% of the raw materials are left after processing; third, the processing efficiency is low, only about 100 pieces per shift; fourth, the machining surface roughness is large, generally only reaching 3.2 μm; fifth , the processing size accuracy is low, the error is 0.03-0.05mm; sixth, there are many processes, many equipments are used, and the quality stability is poor