A method for controlling the ultra-fine crystallization gradient of a deep tapered copper medicine mask

A control method and a technology for a drug-type cover, which are applied to explosive charges, offensive equipment, weapon accessories, etc., can solve the problems of large anisotropy of rolled sheets, complicated processes, and low yield of nanocrystalline materials.

Active Publication Date: 2020-10-23
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing large plastic deformation technology is mainly based on conventional extrusion or forging, reverse rolling, and equal channel extrusion. This process has the following disadvantages: First, the grain size is not uniform, and there are mixed deformations in the weak deformation area or severe deformation area. Second, the anisotropy of the rolled plate is large; third, the yield of nanocrystalline materials by equal channel extrusion is low, and the performance consistency is poor; fourth, the process of preparing nanocrystals is long and complicated through a single process; fifth, The inner surface of the drug-shaped mask forms the main body of the effective jet, accounting for about 20% of the total weight, and the cost of preparing the overall nanocrystalline drug-shaped mask is expensive

Method used

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  • A method for controlling the ultra-fine crystallization gradient of a deep tapered copper medicine mask
  • A method for controlling the ultra-fine crystallization gradient of a deep tapered copper medicine mask
  • A method for controlling the ultra-fine crystallization gradient of a deep tapered copper medicine mask

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Experimental program
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Effect test

Embodiment 1

[0039] (1) Preparation of the blank: Taking the variable-wall thickness medicine cover with a double cone structure as an example, the medicine cover has a diameter of 165mm, height 178mm, inner cone depth 142mm, and wall thickness 2.4~3.2mm. The small cone angle at the top is 36°, the large cone angle is 64°, the transition arc between the large cone angle and the small cone angle is R220mm; according to the theory of plastic processing and the principle of nearly uniform plastic deformation, 0.3mm is left on the outer surface of the medicine cover The process allowance of φ25mm is designed on the top of the medicine type cover; the forming process is simulated, analyzed and optimized by UG and DEFORM software, and the volume of the blank is calculated. The extruded T2 copper rod of φ90mm is selected as Raw material, cut and turn the outer surface to make a blank with a diameter of 88mm and a height of 55mm; the impurity element content of the T2 red copper bar is shown in Tabl...

Embodiment 2

[0055] (1) Preparation of the blank: Take the medicine-type cover of equal wall thickness with a single cone structure as an example. The diameter of the medicine-type cover is φ156mm, height 162mm, inner cone depth 148mm, maximum wall thickness 3.2mm, and inner cone angle 60 °According to the theory of plastic working and forming and the principle of nearly uniform plastic deformation, a machining allowance of 0.4mm is left on the outer surface of the multi-pass extrusion molding cover forming part, and a φ20mm forming process boss is designed on the top of the molding cover forming part ;Using UG and DEFORM software to simulate the forming process, and calculate the volume of the blank, choose φ60mm drawn T2 copper rod as the raw material, cut and turn the outer surface to make a blank with a diameter of 58mm and a height of 80mm. The blanks are kept at 400±1℃ for 2 hours in the VQG-2500 intelligent temperature-controlled vacuum heat treatment furnace, and the vacuum degree is...

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Abstract

The invention provides a method for controlling the ultra-fine crystallization gradient of a deep conical copper medicine-shaped mask structure, which includes extrusion forming, recrystallization heat treatment, and high-frequency impact steps. The extrusion forming adopts multi-pass extrusion; The high-frequency impact knocking speed is 15000-40000 times / min, the knocking force is 1200-2000N, and the number of times is 1-3 times. The control technology of the invention realizes the forming and surface quality control of the deep-tapered liner; improves the plasticity of the material and obtains a fine-grained structure; and forms an ultra-fine-grained gradient structure distributed along the thickness direction on the inner surface of the lined liner. The ultra-fine grain gradient structure distributed along the thickness direction of the liner is obtained by this method, and the structure is evenly distributed along the generatrix direction, which provides a new preparation method for the development of high-performance deep tapered copper liner.

Description

Technical field [0001] The invention relates to the technical field of metal plastic forming, in particular to a method for controlling the ultra-fine crystallization gradient of a deep-tapered copper powder cover structure. Background technique [0002] A typical shaped charge jet has a high head velocity (≥8500m / s) and a low tail velocity (about 3000m / s). This velocity gradient enables the jet to be stretched very long under certain explosive height conditions. (Achieve 20-100 times the caliber length of the drug type mask), with high penetration ability. The penetration ability of the jet is proportional to the length of the continuous jet, but due to the internal defects of the metal and the expansion of the jet, the jet will eventually break into segments of jujube-shaped particles in the axial direction, which limits the length of the continuous jet and the penetration Through the transmission of energy, and the mutual disturbance between the fractured particles, its penet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08C22F1/02
CPCC22F1/02C22F1/08F42B1/032F42B1/036
Inventor 陈强舒大禹赵强赵祖德车路长吴洋胡传凯李辉
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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