Wedge transverse rolling die capable of achieving forming of hollow blank without mandrel and rolling method

Abstract

The invention belongs to the technical field of metal plastic forming and particularly provides a wedge transverse rolling die capable of achieving forming of a hollow blank without a mandrel. The wedge transverse rolling die is provided with a body part and a forming part protruding out of the outer surface of the body part, wherein the forming part comprises a wedge sharp point, a wedging section and a widening section, the widening section comprises a first widening section body and a second widening section body, and the widening angle of the first widening section body is larger than that of the second widening section body. Due to the fact that the wedge transverse rolling die is used for the hollow blank without the mandrel, the ovality is slightly enlarged by emptying the top face of the die while the friction force and the torque which are borne by the rolled part at the corresponding position are reduced, so that torsion plastic deformation in the rolling process is reduced, and it is ensured that the rolled part is not twisted off. Due to the fact that the ovality and the oversize of the inner diameter of the wedging position in the rolling process without the mandrel are well improved, the dimension of the rolled blank is accurate, the inner wall is almost equal in inner diameter, and quality is high.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular provides a cross-wedge rolling die and a rolling method for realizing precise forming of a mandrel-free hollow blank. Background technique [0002] With the development of automobile lightweight, thin-walled and hollow parts are one of the ways to realize automobile lightweight, and the forming process of hollow shaft parts has also received extensive attention. [0003] In the existing hollow cross wedge rolling process, when the inner hole size of the target product is large, most of them adopt the rolling method with mandrel. The target product has a small inner hole and is rolled without a mandrel. When rolling without mandrel, there is a certain degree of ellipticity in the rolled piece, especially near the center of symmetry. The elliptical rolled piece is in contact with the top surface of the wedge of the mold, resulting in large torsional plastic deformat...

AI Technical Summary

Problems solved by technology

This means that the target product quality is poor when the hollow billet is rolled without mandrel, the machining allowance is large, and the scrap rate is high

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