Gearbox parking gear manufacturing method

Abstract

The invention discloses a gearbox parking gear manufacturing method. The manufacturing method comprises the steps of feeding, shot blasting, heating, warm forging, hardening and tempering, shot blasting, cold shaping, end face finish turning, internal spline broaching, induction surface quenching and flaw detection, wherein the warm forging machining process further comprises the steps of upsetting, pre-forming, final forming, punching and trimming. According to the gearbox parking gear manufacturing method, a gearbox parking gear is manufactured through the warm forging, the quenching and tempering, the cold shaping and the induction quenching of medium carbon steel, the tooth surfaces of parking teeth do not need to be machined subsequently after the warm forging, and the forging streamline of the tooth surfaces of the parking teeth is not cut off, so that a subsequent product keeps high mechanical strength; a core part of a product is quenched and tempered, the quenched and temperedsorbite structure can keep high strength and high toughness, the cold shaping is carried out after the hardening and tempering to correct thermal deformation of the hardening and tempering, and the surfaces of the parking teeth are subjected to high-frequency quenching, so that low thermal deformation and high surface hardness are kept; and the gearbox parking gear manufacturing method is reasonable in design, the process advantages of net forming forging, hardening and tempering and surface quenching are combined, the material utilization rate is increased, the machining and manufacturing cost is reduced, surface oxidation and thermal deformation of the product are effectively controlled, and the precision and quality of the product meet the use requirements.

Description

technical field [0001] The invention relates to a technology in the field of precision machining of gears, in particular to a method for manufacturing a parking gear of a gearbox by coupling precision plastic forming and heat treatment with high precision. Background technique [0002] The parking gear is a very important safety part in the gearbox, and its precision requirements and parts quality requirements are high; now the processing method of using medium carbon steel to manufacture the parking gear in the industry is generally broaching, and its metal flow line is destroyed , so it may affect the impact resistance and bending strength of subsequent parts, and the input cost of broaching machines and broaching equipment is relatively high. [0003] After searching the prior art, it was found that Chinese Patent Document No. CN 103157759 A discloses a temperature-cooling compound precision forging process for cylindrical gears. The process adopts warm forging, normalizi...

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Problems solved by technology

[0002] The parking gear is a very important safety part in the gearbox, and its precision requirements and parts quality requirements are high; now the processing method of using medium carbon steel to manufacture the parking gear in the industry is generally broaching, and its metal flow line is destroyed , so it may affect the impact resistance and bending strength of subsequent parts, and the input cost of broaching machines and broaching equipment is relatively high

[0003] After searching the prior art, it was found that Chinese Patent Document No. CN 103157759 A discloses a temperature-cooling compound precision forging process for cylindrical gears. The process adopts warm forging, normalizing and cooling finishing, but this process It is only suitable for low carbon steel. The hardness of forgings in the normalized state is low, and subsequent surface hardening and quenching heat treatment must be performed to meet the use requirements of the parts.

However, the disadvantage of surface hardening and quenching heat treatment is that the quenching heat deformation is large, the tooth shape accuracy of the parking gear will be reduced, and the long-term heating during the quenching process will cause the surface oxidation of the parts and affect the quality of the parts

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