A single-head spline shaft sleeve processing technology

Abstract

The invention provides a machining technology for a single-end spline shaft sleeve. The machining technology comprises the steps of feeding, shot blasting, surface coating, heating, forging, quenching, tempering and warm extrusion forming. The phase change and deformation coupling close forming technology is adopted in the machining technology for the single-end spline shaft sleeve, a manufactured part needs no subsequent machining except for the critical dimension, and the utilization rate of a raw material is increased; compared with a traditional die forging forming technology, structure homogenization, grain refinement and dispersion strengthening are achieved fast, and the problems that due to the fact that deformation is large due to the tempering or normalizing technology in the later forming period of the traditional die forging technology, microcracks are easily generated on a core, or coaxiality cannot be guaranteed are avoided; and in addition, the machining technology is high in technology productivity and short in manufacturing period, energy consumption and manufacturing cost are reduced, and the whole competitiveness of products is improved.

Description

technical field [0001] The invention relates to the technical field of metal machining, in particular to a forging process of a single-head spline shaft sleeve. Background technique [0002] In recent years, with the rapid development of the machinery industry represented by the automobile industry and the increasingly fierce competition in the international market, improving the accuracy and performance of parts, realizing high efficiency in the design process, low cost and low energy consumption in the production process has become an increasing trend in the manufacturing industry. important means of market competitiveness. The common cutting processing technology and traditional forging technology that have been inherited for many years have been difficult to meet the current production requirements. The traditional forging technology is to use the forging machine to exert pressure on the metal billet to cause plastic deformation to obtain forgings with certain mechanica...

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Problems solved by technology

The disadvantage of adopting this existing technology is: in the forging process, it is difficult to accurately control the metal microstructure, there is inhomogeneity in the microstructure after forging, and irregularly distributed coarse grains can be observed in the metallographic structure ( like Figure 4 shown); although the subsequent normalizing process can refine the structure to a certain extent, improve the metal properties, and eliminate the uneven stress distribution in the forging process, the normalizing heating temperature is high and the holding time is long, resulting in high energy consumption. At the same time, the production efficiency is also reduced; and the cold extrusion process is carried out at room temperature, so the deformation resistance is relatively large, and the cold extrusion die is subjected to a complex stress state in the alternating temperature field of cold and heat, and the die loss is serious; in addition , the workpiece has a large amount of deformation during the post-quenching process. Not only is it difficult to guarantee the dimensional accuracy of the workpiece, but it is also prone to microcracks. These microcracks are likely to become a source of stress concentration during the use of the workpiece, leading to macroscopic fractures and reducing the service life of the product.

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