Molding process for straight bevel gear

Abstract

The invention relates to a processing technique for a straight bevel gear and aims to provide a molding process for a straight bevel gear in order to improve the forging processing precision and processing efficiency of the bevel gear. The molding process comprises the following steps: (1) tooth die modeling includes rough forging tooth die modeling and finishing tooth die modeling; the pitch circle chordal tooth thickness of the rough forging tooth die is slightly smaller than that of the finishing tooth die, and the tooth whole depth of the rough forging tooth die is larger than the tooth whole depth of the finishing tooth die; the single tooth profile volume of a 0.992 rough forging tooth equals to the product of the single tooth profile volume of the finishing tooth die and 1.008; (2) the warm forging plastic forming is carried out; (3) hot forging edge cutting is carried out; (4) rough forged pieces are subjected to normalization, surface grit blasting and phosphorous saponification; (5) cold accurate alignment plastic forming is carried out. The processing technique for the straight bevel gear has the advantages that the quantity of raw materials is saved, the technological requirements on blank processing are lowered; the production cycle is reduced, and the cost is reduced; the product quality is stable, the product precision is high, the mechanical performance is good, the tonnage of required equipment is small, and the cost is low.

Description

technical field

[0001] The invention relates to a processing technology of a straight bevel gear. Background technique

[0002] Straight bevel gears are mainly used in automotive rear axle gearboxes, hydraulic transmission diesel locomotives, fan shafts, axle gearboxes, planer workbenches and feed mechanisms. Its complex shape requires high material, dimensional accuracy, surface quality and mechanical properties. In order to improve material utilization, mechanical properties and production efficiency, forging is basically used in China to produce gear forgings, and then machining gear parts.

[0003] At present, domestic processing methods are mainly divided into two types: cold forging and hot forging. The cold forging method is to anneal and soften the billet first, then turn the surface oxide scale off, and then carry out phosphorus saponification surface treatment on the billet, use a hydraulic press to forge the billet into a gear forging with a forging die, and its...

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