Upsetting forming method of ultra-large height-diameter ratio metal blank

Abstract

The invention provides an upsetting forming method of an ultra-large height-diameter ratio metal blank. The method comprises the following steps that (1), according to the initial blank size, the mold interior upsetting blank diameter increasing rate and the free upsetting blank height-diameter ratio, the mold interior upsetting pass is determined to plan the upsetting technological process; (2), according to the target size of an upsetting forming part, the free upsetting blank height-diameter ratio and the mold interior upsetting blank diameter increasing rate, the upsetting ratios of all upsetting passes are determined; (3), an annular mold with the demolding slope is adopted for mold interior upsetting, the main working size can be determined by means of the method that the upsetting blank sizes of all the passes are calculated according to the upsetting ratios of all the passes; and (4), upsetting forming is conducted, specifically, upsetting of all the passes is sequentially conducted through a press machine and a mold according to the planned upsetting process, and finally the needed upsetting forming part is obtained. According to the upsetting forming method of the ultra-large height-diameter ratio metal blank, the phenomenon of upsetting instability of the ultra-large height-diameter ratio blank can be effectively avoided, upsetting bending of the blank is avoided, upsetting deformation uniformity can be adjusted and controlled, and the upsetting capacity is lowered, so that the effects of upsetting quality improving, upsetting energy consumption reducing and device upsetting size range enlarging are achieved.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to an upsetting forming method of a super-large aspect ratio metal blank. Background technique [0002] As the most basic plastic forming step, upsetting plays a key role in the main plastic forming processes such as forging, extrusion and rolling. Impact. With the rapid development of high-end major equipment in the fields of machinery, energy, and aerospace, the performance requirements for large forgings are getting higher and higher. In order to achieve high-performance manufacturing of large forgings, it is usually necessary to eliminate the original defects of the blank as much as possible and improve the internal structure through large plastic deformation. State, improve comprehensive mechanical properties. In order to achieve the above purpose, a large upsetting ratio is usually required to support it, and in order to obtain a large upsetting ratio,...

AI Technical Summary

Problems solved by technology

However, the maximum height-to-diameter ratio of upsetting blanks in practical applications can only reach about 3.3

In the case of upsetting blanks with larger height-to-diameter ratios, in order to prevent upsetting instability, only large-diameter blanks can be used. On the one hand, the upsetting ratio is sacrificed. more difficult to control and relatively worse

In addition, for forgings of some special materials for aerospace, due to the limitation of the size of the billet itself, it is impossible to choose a billet with a larger diameter, and when it is necessary to perform upsetting with a large height-to-diameter ratio, it brings bottleneck constraints to the forming of forgings

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