Foundry practice method of heavy-duty car forward shaft

Abstract

The invention relates to a casting and producing method of a front shaft of a heavy-duty car, which belongs to the enginery. The method adopts copper-nickel alloying isothermal quenching magnesium iron which has higher strength and tenacity compared with the traditional copper-molybdenum alloying isothermal quenching magnesium iron, thereby the service life of the front shaft can be improved; a front shaft blank is cast by adopting a sand-coated iron mould process; the spheroidization of the blank is carried out by adopting a tundish-cover crushing method so that the spheroidization is more stably; a process of mechanical processing firstly and isothermal quenching later ensures that the front shaft does not deform; and the isothermal quenching treatment is performed on a salt bath furnace production line with shielding gas atmosphere to produce an austenite plus acicular ferrite matrix, thereby the tenacity of the front shaft is greatly improved. The method achieves the material revolution that forging is substituted by casting and steel is substituted by iron, saves a heavy forging device or the die investment, shortens the production period, and has obvious economic and social benefits.

Description

Technical field: [0001] The invention relates to machinery, in particular to a casting production method of a heavy-duty vehicle front axle, especially a production method of a copper-nickel alloyed austempering ductile iron casting heavy-duty vehicle front axle. Background technique: [0002] As we all know, the traditional automobile front axle is made of high-quality alloy forged steel, which is formed by die forging with large-scale forging equipment. Generally, high-quality alloy forged steel is mostly 40Cr or 42CrMo. The utilization rate of the forging die is low, which increases the cost of the car; secondly, the forging die used in the die forging has a long processing cycle and the selection of steel is expensive; such as the front axle of a heavy-duty vehicle, a set of forging dies costs several million yuan; Forging equipment can only be formed by die forging, and each forging equipment requires an investment of tens of millions of yuan; for trial production of ne...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a casting production method of a heavy-duty automobile front axle, which solves the defects of the current traditional automobile front axle die forging, which cause high investment costs, waste of precious metals, and long production cycles.

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