Feed head-free cross wedge rolling and forming method for axial parts

Abstract

The invention discloses a feed head-free cross wedge rolling and forming method for axial parts, which is characterized by comprising the following steps: during the rolling, two ends of a blank are respectively rolled into the shape of an arc frustum with a large inward end and a small outward end, the entire length of the blank is unchanged at the same time, and the blank two ends of which are in the arc frustum shape, is continuously rolled in a die from the central section to the two ends of the blank by adopting a conventional cross wedge rolling method to obtain the feed head-free axialparts which meet requirements. The feed head-free cross wedge rolling and forming method has the advantages that two ends of the blank are respectively rolled into the shape of the arc frustum with the large inward end and the small outward end during the rolling, which can ensure the consistency of the fluxion of surface metal and central metal of a rolled piece in the subsequent rolling process, and avoids the indentation at the ends of the rolled piece and the feed head generation of the rolled piece; the material utilization rate is improved, and the production cost is reduced; and the surface quality of the rolled axial parts is favorable, and the material utilization rate can be enhanced by more than 95% by adopting the forming method.

Description

technical field [0001] The invention relates to a plastic forming technology of shaft parts, in particular to a method for forming shaft parts by cross wedge rolling without head. Background technique [0002] Cross wedge rolling is a new process for one-time forming of shaft parts. It has the advantages of high efficiency and material saving, and has been widely used at home and abroad. However, with the continuous promotion and application of cross wedge rolling technology, the requirements for cross wedge rolling technology are getting higher and higher. How to further improve the utilization rate of materials is a key factor to promote the promotion of cross wedge rolling technology. Although the material utilization rate of the cross-wedge rolling process is much higher than that of the forging and cutting processes, since the cross-wedge rolling process is a deformation process of metal radial compression and axial extension, the surface layer of the rolling end size ...

AI Technical Summary

Problems solved by technology

Although the material utilization rate of the cross-wedge rolling process is much higher than that of the forging and cutting processes, since the cross-wedge rolling process is a deformation process in which the metal is radially pressed and axially extended, the surface layer when rolling the end size The axial flow of metal is faster than that of the metal in the core, which causes a larger concave center at the end of the rolled piece, resulting in the formation of material heads in the rolled-formed parts, which need to be removed by cutting, which reduces the utilization of materials to a certain extent rate, the current material utilization rate of cross wedge rolling is generally below 85%

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