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

A cross-wedge rolling and hollow billet technology, which is applied in the field of cross-wedge rolling dies and rolling, can solve the problems of high scrap rate, poor quality of target products, large machining allowance, etc., achieve accurate billet size, and improve the large inner hole , Reduce the effect of torsional plastic deformation

Inactive Publication Date: 2015-04-22
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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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

Method used

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

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0025] The invention provides a cross wedge rolling die for realizing precise forming of a mandrel-fre...

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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...

Claims

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Application Information

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IPC IPC(8): B21H1/22B21B1/08B21B27/02
Inventor 刘晋平纪宏超苏平胡正寰王宝雨郑振华杨翠萍
Owner UNIV OF SCI & TECH BEIJING
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