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Molding process for straight bevel gear

A straight-toothed bevel gear and forming process technology, which is applied in the field of straight-toothed bevel gear processing technology, can solve the problems of scale, low gear precision, and poor surface quality, and achieve shortened production cycle, high precision, and small equipment tonnage Effect

Inactive Publication Date: 2015-05-06
SICHUAN ZHONGYOU MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the scale is serious, the surface quality is poor, and the gear precision is low. It is not suitable for forging gears with high precision requirements.

Method used

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  • Molding process for straight bevel gear
  • Molding process for straight bevel gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The forming process of straight bevel gear, the raw material is 20CrMnTiH round steel, according to the following steps:

[0026] 1). Tooth mold modeling: including rough forging tooth mold and finishing tooth mold modeling, the indexing circular chord tooth thickness of the rough forging tooth mold is slightly smaller than the finishing tooth mold, and the overall tooth height of the rough forging tooth mold is greater than the fine The overall height of teeth of the whole tooth mold; 0.992 single tooth shape volume of rough forging tooth mold = single tooth shape volume of finishing tooth mold × 1.008.

[0027] The tooth shape of the rough forging tooth die obtained in this step is thinner and taller than the tooth shape of the finishing tooth die. The reason is: during fine calibration, the tooth top of the rough forging will first contact the tooth top of the finishing tooth mold. , the principle is similar to pier rough extrusion. Because during the subsequent no...

Embodiment 2

[0037] The forming process of straight bevel gear, the raw material is 20CrMnTiH round steel, according to the following steps:

[0038] 1). Tooth mold modeling: including rough forging tooth mold and finishing tooth mold modeling, the indexing circular chord tooth thickness of the rough forging tooth mold is slightly smaller than the finishing tooth mold, and the overall tooth height of the rough forging tooth mold is greater than the fine Overall tooth height of the whole tooth mold; 0.992 single tooth shape volume of rough forging tooth mold = single tooth shape volume of finishing tooth mold × 1.008;

[0039] 2). Warm forging plastic forming: a. Saw material: CNC sawing machine intercepts metal bar to obtain solid cylindrical material; b. Billet making: use centerless grinder to remove black skin on the surface of solid cylinder, and use double-sided chamfering machine to chamfer; c. Heating: Put the bar into an intermediate frequency heating furnace and heat it to 820-830...

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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...

Claims

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Application Information

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IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 冯文茂钟广伟王东张婧
Owner SICHUAN ZHONGYOU MACHINERY
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