Press die for preparing agglomerate ultra-fine crystal material

Abstract

The invention relates to an upsetting press die for preparation of bulk ultrafine crystalline materials, which belongs to the materials processing field. The invention comprises an extruding punch, an upper die and a lower die, wherein, the upper die is provided with a vertical square throughhole; the extruding punch is connected to a power plant for free access to the vertical square throughhole and is formed into a mould top chamber together with the upper die after entering into the upper die; the mould top chamber is a vertical square larger in height and length and smaller in width; the lower die is provided with a square or cylinder groove; the upper die and the lower die constitute a square or cylinder mould bottom chamber together. By the artful design of the mould top chamber and the mould bottom chamber, materials can return to the original shape after upsetting press deformation each time. The invention has the advantages of simple structure and strong grain refining capacity, and can prepare bulk ultrafine crystalline materials with even tissue and an average grain size ranging from 100 nm to 1 um.

Description

technical field [0001] The invention relates to a mold in the technical field of material processing, in particular to an upsetting mold for preparing bulk ultrafine-grained materials. Background technique [0002] In recent years, the large plastic deformation technology (Severe Plastic Deformation, SPD), which directly prepares bulk ultrafine-grained materials by using a large strain method, has developed rapidly. However, the uniformity of the structure of the bulk material and the controllability of the process have always been the main problems of the large plastic deformation technology. [0003] After searching the literature of the prior art, it was found that the Chinese invention patent application number 01104059.9, the name of the invention: reciprocating extrusion molding method and its processing device, the patent uses the left extrusion cylinder and the right extrusion cylinder to form an extrusion container, and the left A two-way extrusion die is set betwe...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is that it integrates extrusion and upsetting deformation, so the amount of deformation per pass should not be too large

Secondly, since both extrusion and upsetting inevitably result in unequal central strain and edge strain, it is difficult to prepare ultra-fine-grained materials with uniform structure without sufficient strain.

Images