Variable cross-section rotary extrusion mold and using method thereof

Abstract

A variable cross-section rotary extrusion die and its use method, including a punch and a die, the die is provided with a forming cavity; the forming cavity includes an introduction section, and the lower end of the introduction section is connected to a threaded section of a multi-stage rotary extrusion section The upper end of the threaded section of the multi-stage rotary extrusion section is connected to the outlet section; the punch is set in the introduction section; when in use, the punch squeezes the first preformed blank, and when the punch coincides with the introduction section, the extrusion device is closed ; Open the extrusion device again, when the punch comes out from the forming cavity of the die completely, place the second pre-deformed blank in the introduction section of the forming cavity of the die, open the extrusion device, the punch and the introduction When the lower end surfaces of the segments are overlapped, the extrusion device is closed, and the second pre-deformed billet will squeeze the first pre-deformed billet out of the forming cavity of the die, and the first pre-deformed billet passes through the introduction section, the multi-stage rotary extrusion section, and the threaded section in turn. 1. Deformation of the lead-out section to complete the variable cross-section rotary extrusion deformation of the first preformed blank; the invention has the advantages of simple process and high forming efficiency.

Description

technical field [0001] The invention belongs to the technical field of material extrusion, and in particular relates to a rotary extrusion die with variable cross-section and a using method. Background technique [0002] Upsetting is a basic forming method for plastic forming of metal materials. Upsetting can effectively refine the material structure and improve the comprehensive properties of the material. But in the upsetting process of the material, the drum shape is easy to appear. In order to improve the drum shape, the stacked upsetting method can improve the uneven forming of the material to a certain extent, and greatly increase the upsetting ratio (Journal of Nanchang Aeronautical Industry Institute, 2004, (1):34-38; Forging Equipment and Manufacturing Technology, 2008, (6):59-61). [0003] Combining upsetting and extrusion improves the forming efficiency to a greater extent. The invention patent application with the publication number CN1827829A proposes a method ...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention aims to provide a variable cross-section rotary extrusion die and its use method, so as to solve the problems of numerous procedures and low forming efficiency in the current preparation method of fine-grained materials

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