Method for producing upper gear tooth of steering arm shaft of automotive power steering gear

Abstract

The invention relates to a steering arm shaft of an automobile power steering gear, in particular to a manufacturing method for a gear on the steering arm shaft of the automobile power steering gear. A forging die is included; the method includes the following steps: metal blank is heated to 1,150DEG C to 1,200 DEG C and is put into a blank forming die of the forging die, and the volume of the blank is reasonably distributed by forging to obtain a forging bar of the steering arm shaft; the forging bar of the steering arm shaft is taken out and reheated to 850 DEG C and 900 DEG C; the heated forging bar of the steering arm shaft is taken out and put in the die impression of the forging die for molding and forging to obtain a molded steering arm shaft with gear teeth on the shaft body; after forging, the gear teeth are reserved with cutting amount for machining; a normalizing mode is adopted for the heat treatment of the molded steering arm shaft; cutting is carried out to the cutting amount reserved on the gear teeth, and superficial treatment is carried out after cutting. The manufacturing method of the invention can reduce cutting amount, shorten cutting time, improve the strength of the gear and lower manufacturing cost.

Description

technical field [0001] The invention relates to a steering arm shaft of an automobile power steering gear, in particular to a manufacturing method of gear teeth on the steering arm shaft of an automobile power steering gear. Background technique [0002] With the rapid development of the automobile industry in recent years, the technical level of the automobile steering gear, which is one of the important safety parts of automobiles, has been greatly improved. In the automobile steering industry, the recirculating ball steering gear was promoted in the 1970s, and the recirculating ball variable transmission ratio steering gear was developed and promoted in the 1980s, which played a great role in improving the portability of automobile steering; in the 1990s, driving Drivers' requirements for the steering performance of automobiles have been further improved, requiring lighter steering and more sensitive handling. [0003] The steering arm shaft is one of the important parts...

AI Technical Summary

Problems solved by technology

[0004] First, because no gear teeth are forged on the shaft body of the steering arm shaft 11 during forging, not only the amount of cutting is large during machining, but the processing time is long; moreover, most of the metal streamline layer 13 is cut off, resulting in the resulting gear teeth 12 low intensity

[0005] Second, after forging, the steering arm shaft is often heat treated by quenching. This method not only has high cost, but also reduces the machining performance of the product, resulting in low machining efficiency.

[0006] Third, although the surface hardness of the steering arm shaft obtained by forging is high, its hardness will gradually decrease from the surface of the shaft to the center of the shaft. Due to the large cutting allowance and uneven hardness distribution of the metal, when cutting , it is easy to cause sticking to the knife, which not only affects the cutting efficiency, but also reduces the cutting quality

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