Warm precise forging forming method for hollow gear shaft blank

Abstract

The invention provides a warm precise forging forming method for a hollow gear shaft blank. The method is characterized by including the steps of 1) according to the shape and the size of a forge piece, optimizing the shape of a forging blank by simulation software and calculating the size of the forging blank by combining a volume invariant principle; 2) designing a forging die and a mandrel according to the size of the forging blank; 3) blanking, preliminary extrusion-upsetting and subjecting the blank to warm precise forging. The warm precise forging forming method for the hollow gear shaft blank has the advantages that the hollow gear shaft blank produced by the warm precise forging forming method enables a hollow gear shaft to be high in strength and precision, good in forming effect, compact and uniform in internal structure, good in surface quality and continuous and reasonable in forge piece streamline, so that general mechanical performances of the hollow gear shaft are improved; the method is high in material utilization ratio and efficiency, low in production cost, reliable in technology, stable in quality and the like.

Description

technical field [0001] The patent of the present invention relates to a warm precision forging forming process for a hollow gear shaft blank, in particular to a warm precision forging forming method for a hollow gear shaft blank made of 27MnCr5 alloy steel. [0002] technical background [0003] 27MnCr5 is a German Mn-Cr series gear steel. It has good strength, toughness, wear resistance, impact, bending and contact stress, good processing performance, small deformation and high precision. It is mainly used in Audi, Jetta, Santana And Fukang car gears, Iveco minibuses and some imported heavy-duty truck gears. [0004] As an extremely important mechanical part that supports rotating parts and rotates with them to transmit motion, torque or bending moment, the gear shaft is widely used in many industries such as automobiles and construction machinery. High requirements, and its quality directly affects the performance of related products. Gear shaft precision forging is ...

AI Technical Summary

Problems solved by technology

Warm precision forged gear shaft is superior to hot forged gear shaft in performance. It not only has a compact structure, but also has small thermal deformation in subsequent processing, and at the same time, the tooth surface roughness is low, and the tooth shape accuracy is high. Its performance is close to that of cold precision forged gear shaft. , but it overcomes the problems of large deformation resistance, poor filling effect, high requirements for mold equipment, high temperature oxidation and surface quality of hot precision forging in the cold precision forging forming process.

At present, there is no report on the precision forging process of the hollow gear shaft. The present invention will provide a warm precision forging forming process of the hollow gear shaft blank, which is economical, practical, high in efficiency, and has good forging performance, and is suitable for mass production of warm precision forging. craft

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