Preparation method of fine-grain weak-texture tissue blank for shaped charge liner

Abstract

The invention provides a preparation method of a blank for a shaped charge liner. The preparation method comprises the following steps: sequentially carrying out multidirectional reciprocating upset-extrusion and ultralow-temperature large-deformation extrusion; the multi-direction reciprocating upsetting-extruding is to sequentially carry out reciprocating upsetting-extruding on three surfaces with the same vertex of the hexahedral square billet, the single extrusion ratio is greater than or equal to 1.5, and 2-4 passes of circulating multi-direction reciprocating upsetting-extruding are completed; according to the ultralow-temperature large-deformation extrusion, the blank is subjected to subzero treatment for 60-150 min, the inner cone angle of the extrusion working part of the forward extrusion die is 90-140 degrees, and the extrusion rate is 10-20 mm/s. According to the invention, a fine-grain and weak-texture structure can be realized, and the isotropy, the high yield ratio and the high ductility of the shaped charge liner are improved.

Description

technical field [0001] The invention relates to the technical field of metal plastic forming, in particular to a method for preparing a fine-grain and weak-texture blank for a drug-type cover. Background technique [0002] A large number of in-depth studies have been done abroad on the relationship between drug-type mask materials, structures (grain size, morphology, distribution, grain orientation, etc.), geometric dimension accuracy and damage efficiency. The results show that under the same condition of drug-type cap structure parameters and charge assembly, the grain size and uniformity, texture (grain orientation) and other intrinsic organizational parameters have a significant impact on the penetration ability, among which the grain size and its distribution Regularity (texture strength) is a key factor affecting the intrinsic quality of damage efficacy. [0003] At present, the metal materials used to manufacture the drug-shaped cover of the shaped charge warhead mai...

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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