A preparation method of fine-grained and weak-textured blank for medicine-shaped mask

Abstract

The invention provides a method for preparing a billet for a medicine-shaped cover, which sequentially performs multi-directional reciprocating and ultra-low temperature large-deformation extrusion; the multi-directional reciprocating upsetting extrusion is sequentially performed on three faces of the six-sided billet with the same apex Reciprocating upsetting extrusion, single extrusion ratio ≥ 1.5, complete 2 to 4 cycles of multi-directional reciprocating upsetting extrusion; the ultra-low temperature and large deformation extrusion is to subject the billet to cryogenic treatment for 60 to 150 minutes, and extrude the working part of the extrusion die The inner cone angle is 90°~140°, and the extrusion rate is 10~20mm / s. The invention can realize fine-grained and weak texture structure, and improve the isotropy, high yield ratio and high ductility of the liner.

Description

technical field [0001] The invention relates to the technical field of metal plastic forming, in particular to a preparation method of a fine-grained weak-textured blank for a medicine-type cover. Background technique [0002] Foreign countries have done a lot of in-depth research on the relationship between the material, structure (grain size, morphology, distribution, grain orientation, etc.), geometric size accuracy and damage efficiency. The results show that the grain size and uniformity, texture (grain orientation) and other internal structure parameters have obvious effects on the penetration ability under the same conditions as the structure parameters of the capsule and the assembly of the charge. The grain size and its distribution Regularity (texture strength) is a key factor affecting the intrinsic quality of the damage efficacy. [0003] At present, the metal materials used to manufacture the shaped charge warhead drug cover mainly include: single metal materia...

AI Technical Summary

Problems solved by technology

A large number of experimental studies have shown that the drug-type cover made of hot-rolled or directly extruded copper rods or plates has an average grain size of 20 μm to 60 μm, a texture strength of 20 to 40, and poor coordination of tissue deformation, which leads to premature fracture of the jet and formation of The penetrating body with uneven deformation seriously affects the damage efficiency of the liner cover. The damage capability against the new generation of reactive armor, ceramic armor, and composite armor is seriously insufficient. The development of fine-grained and weak-textured liner cover has become a high-performance warhead. top priority

[0004] Existing large plastic deformation technologies include extrusion or multi-directional forging, reversing rolling, and equal channel extrusion, etc., which have the following disadvantages: First, the uniformity of grain size is poor, and there are uneven deformation shears in weak deformation areas or severe deformation areas. The slit strip and the central undeformed area form a mixed crystal structure after recrystallization; second, the width and length direction of the rolled plate are large, forming a strong texture structure; third, the yield of the equal-channel extrusion material is low and the performance is consistent Fourth, the process of preparing fine-grained materials is long and complex

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