Warming forging precision forming manufacture process for steering bearing ring of motorcycle

Abstract

The invention discloses a manufacture process for a blank of a steering bearing ring of a motorcycle. A warm forging precision forming method is adopted and comprises the following steps of cutting and blanking a hot-rolled unannealed GCr15 cylindrical rodlike blank, heating the blank to the temperature of 200DEG C, soaking in a compound water-based graphite lubricant, taking out, heating the blank to the temperature of 750DEG C through medium frequency induction heating, and upsetting the blank in a high speed upsetter, so that the blank in the same specification can be processed into bearing rings in different size specifications; putting the upset blank into a die forging machine for warm forging, spray-coating the compound water-based graphite lubricant into a die cavity of a warm forging die, and preheating at the temperature of 200DEG C; performing spherodizing annealing on a forge piece formed through warm forging, so that the hardness is reduced and preparation for the subsequent finishing is carried out. The formed blank is not required to be cut or is only required to be subjected to a small amount of cutting to meet the requirement of a product, materials are greatly saved, forming procedures are simple, the efficiency is high and the cost is low; a metal flow line of a material is not cut off, and the comprehensive mechanical properties are improved through forging and extrusion.

Description

technical field [0001] The invention relates to a processing and forming process for a motorcycle steering bearing ring, in particular to a manufacturing process suitable for warm forging precision forming of a GCr15 high-carbon steel bearing ring. Background technique [0002] A motorcycle steering bearing ring is an annular part of a radial rolling bearing with one or several raceways. The inner ring is the bearing ring with the raceway on the outer surface, and the outer ring is the bearing ring with the raceway on the inner surface. This kind of parts is widely used in mechanical manufacturing, and the reason why it is widely used is that it has the functions of convenient assembly and disassembly, axial fixing, and axial position adjustment. The inner and outer rings of the bearing are the two main parts of the bearing. Their average weight accounts for about 70% of the bearing weight, and the cost accounts for about 40%. Therefore, bearing ring processing is an impor...

AI Technical Summary

Problems solved by technology

Due to the high heating temperature of the metal, the surface of the forging is seriously decarburized and oxidized, which affects the forming quality of the product. The precision of the obtained product is not high, and the follow-up needs to be finished with a lathe to remove the thicker decarburized oxide layer, resulting in a low material utilization rate.

The positioning of the product is inaccurate during forging, and the scrap rate is high. The flash must be cut off, which affects the mechanical properties of the product

[0004] With the continuous development of the industry, it is necessary to replace the old bearing ring forming method with a new process in order to solve the problems of complex forming of bearing rings, material waste, low efficiency and poor quality in the past.

Due to the complex forming of bearing rings, the old process is inefficient, and the mechanical properties of the material are reduced due to cutting damage to the fibrous structure of the material

However, if it is formed by one-time cold forging, there may be defects such as cracks or even fragmentation of the bearing ring. At the same time, the load requirements on the processing equipment are very large, and the mold damage is very serious.