Problems in precision forging technology of spiral bevel gears

The driven spiral bevel gear mechanical transmission system plays the role of adjusting speed and transmitting power. It has the characteristics of high quality and large demand. For the driven spiral bevel gear, the traditional machining method refers to mechanical cutting. This method has many disadvantages, such as low machining efficiency and low material utilization. The spiral bevel gear processed by precision forging has many advantages, such as small grain size, good mechanical properties and high material utilization rate. However, it still faces the problems of machining accuracy and die life, which limits the wide application of this process to a certain extent. With the continuous development of industrial technology at home and abroad, higher requirements are put forward for the cost, efficiency and quality of spiral bevel gear processing technology, which promotes the development of precision forging technology towards high precision, high efficiency and automation.

Unreasonable precision forging process flow, process parameters or preform shape are easy to cause problems such as difficult material flow, large forming force and reduced die life. In this paper, the precision forging process of driven spiral bevel gear of automobile rear axle is studied. The numerical simulation method is used to simulate the metal flow filling process, study the distribution and evolution of material stress and strain, the change of forming load with die stroke, the law of uneven elastic deformation of die tooth profile, etc, Through preform design and process optimization, the comprehensive objectives of improving preform forming quality, reducing forming defects, improving stress distribution and reducing forming force are achieved. This has important theoretical and practical significance for improving the technical level of precision forging of spiral bevel gears and promoting the independent innovation ability and market competitiveness of China’s high-performance auto parts industry.

spacer