A kind of upsetting extrusion forming method of bimetal material drug-type cover

Abstract

The invention provides a preparation method for a double-metal-material shaped charge liner. The method is characterized in that the upsetting-extruding compound forming process is involved, wherein upsetting-extruding is achieved in the way that under the action of the three-direction pressure stress and the deformation rate of 5-10mm / s, extrusion deformation is carried out for 3-10 times, and the deformation amount for each time is 3-40%. According to the method, the technical problems that a component obtained by a conventional preparation method is poor in surface quality, large in internal grain size difference and not uniform in stress distribution are overcome, the tissue uniformity and wall thickness consistency are well controlled, and the method has the advantages of being high in production efficiency, good in process stability, easy to realize industrial production and the like.

Description

technical field [0001] The invention belongs to the metal plastic forming technology, in particular to the field of precision forming of a bimetal drug-type cover. Background technique [0002] Tantalum has high density, high dynamic ductility and excellent penetration performance, which can significantly improve the penetration ability and anti-interference ability at high explosion heights. One of the ideal materials. The high cost of tantalum materials is a restrictive link in the application of drug-type covers. In order to reduce material costs and improve the after-effect of penetration and damage of drug-type covers, in recent years, tantalum-zirconium bimetals with after-effects of ignition and damage after penetration have been developed. Material. [0003] According to relevant literature, domestic and foreign manufacturing technologies for tantalum and tantalum alloy drug covers mainly include bar turning, sheet metal stamping, spinning, and swing rolling formin...

AI Technical Summary

Problems solved by technology

[0004] The specific deficiencies and shortcomings of these technologies: First, bar turning processing, tantalum is easy to stick to the knife, forming extrusion defects, and the surface is rough, and the processing is very difficult, the material utilization rate is low, and the processing cycle is long, which can only guarantee the shape of the parts The structure cannot improve the internal structure and performance; the second is that the anisotropy of the stamping forming texture of the sheet metal is large, and the internal structure of the mixed crystal is serious, which cannot improve the anisotropy of the sheet rolling. The shape is uncertain, the symmetry is poor, and the size is unstable; the third is that the surface of the spinning formed part is rough, and the dimensional accuracy is difficult to guarantee. At the same time, the grain structure is distorted, the stress distribution along the circumferential direction of the drug cover is uneven, and the deformation along the direction of the generatrix is ​​different. Large, uneven grain size, and complex finishing process; Fourth, pendulum milling can only obtain a certain shape and structure blank, and the dimensional accuracy and surface quality cannot meet the final use requirements of the product, and subsequent cutting processing is required to meet the dimensional accuracy requirements

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