Strong plastic deformation extrusion molding device and method for magnesium alloy band rib barrel-type part

Abstract

The invention provides a strong plastic deformation extrusion method and a molding device for magnesium alloy band rib barrel-type part, belonging to the technical field of plastic processing. A columnar billet is subjected to channel-changing corner extrusion for the first time to extend to a circumferential direction to form a circular rib and then subjected to the channel-changing corner extrusion for the second time to enter an up-down mold cavity to form a thin-walled cylinder provided with four longitudinal ribs. When a material is subjected to corner extrusion for multiple times, crystalline grains are constantly refined to generate strong plastic deformation to cooperate with the mold cavity to realize extrusion molding once and obtain the high-strength magnesium alloy band rib barrel-type part. The length of a diameter fixing band of an extrusion mold is shrunk so as to reduce friction between a formed part and a mold to decrease forming force. A longitudinal pull rod and a transverse shaft pin for special purpose are designed and cooperate with a mold structure, and after part molding is completed, the return stroke of a workbench on an extruder is utilized to disassemblethe mold and take out the formed part. A magnesium alloy barrel-type part, which has high strength, can be molded once, a circular rib and longitudinal bars therein can be used as support structures,and the designed part taking structure can be used for effectively solving the problem that a barrel-type extrusion part is difficult to take out.

Description

technical field [0001] The invention relates to the technical field of metal plastic processing technology and forming, in particular to a method for extrusion forming of high-performance rib cylinder parts made of magnesium alloy materials. Background technique [0002] Cylindrical parts are typical structural parts in aerospace, transportation and other fields. With the continuous progress of the aerospace industry, how to achieve high performance and light weight of aerospace cylindrical parts has become an urgent problem to be solved. The thin-walled ribbed structure can effectively improve the strength and rigidity of the cylindrical part, and effectively reduce the mass of the part. For such parts, there are currently cutting, casting, welding and spinning forming methods. Using cutting to form ribbed cylindrical parts will destroy the metal streamline, greatly reduce the mechanical properties and performance, and the machining allowance is large, which not only waste...

AI Technical Summary

Problems solved by technology

However, the existing strong plastic deformation technology is mainly to obtain better internal structure and properties of the blank metal. In the subsequent hot forming process, due to high temperature and other reasons, the structure and properties of the blank will change to a certain extent, so that Fine grain strengthening effect weakened

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