Device and method for preparing fine-grained material by directly extruding continuous variable cross section

Abstract

The invention relates to a device and a method for preparing fine-grained material by directly extruding a continuous variable cross section, which relate to a device and a method for preparing fine-grained material. The invention solves the problems of the traditional fine-grained material preparation methods that the procedures are complicated, the process requirements are high, the texture orientation is significant, the defects of folds and material interface superposition are easy to occur in processing and preparation and the preparation methods are difficult to be implemented in production. A primary transition die cavity, a secondary transition die cavity and a core die cavity of the preparation device of the invention are combined to form an axial corrugated extrusion cavity of the continuous variable cross section; the preparation method of the invention comprises the following steps: the preparation device is assembled; an ingot is arranged in a female die, a punch head is put it, a punch head is put in, the die orifice on a core die extrusion end is closed, the punch head descends, the ingot is extruded form a primary transition die orifice and a secondary transition die orifice, the punch head continues to descend, and the ingot is upset and deforms; and the closure is removed, the punch head continues to descend, and the ingot is extruded and formed. The invention requires simple equipment and few production procedures, and is easy to be implemented and popularized in production.

Description

technical field [0001] The invention relates to a device and method for preparing fine-grained materials, in particular to a device and method for directly extruding fine-grained materials with continuously variable cross-sections, and belongs to the technical field of material plastic processing. Background technique [0002] Lightweight structure is one of the main development trends of components. There are two main ways to realize the lightweight structure: one is the structural way, which adopts the variable cross-section components of "replacing the solid with space", which not only reduces the mass but also makes full use of the characteristics of the material itself; the second is the material way, which uses magnesium alloy, aluminum Alloy, titanium alloy and other lightweight metal structural materials. For specific lightweight components in some fields, it is impossible to achieve structural lightweight through structural approaches, and the use of high-performan...

AI Technical Summary

Problems solved by technology

The main methods are as follows: The first is the material preparation method. Fine-grained alloys can be prepared by methods such as modification treatment, rapid solidification, powder metallurgy, and spray deposition. ultimately achieves, therefore, less efficient

The second is the use of plastic processing methods, such as materials prepared by equal channel angular extrusion (ECAP), which have obvious texture tendencies, resulting in anisotropic properties in the axial and radial directions; reciprocating extrusion (CEC) extrusion The upsetting of the sample at a large slenderness ratio will form folds and superimposition of the material interface, especially for materials with poor weldability, which will lead to material deterioration; surface treatment and rolling process requirements of the cumulative rolling method (ARB) Both are high, and there will be defects such as poor welding and inclusions

[0004] Based on the above, the invention patent application with the publication number CN1827829A and the publication date of September 6, 2006 proposes a method and device for preparing fine-grained materials by continuous variable-section circular extrusion. Deformation and upsetting deformation are alternately carried out multiple times to obtain the cumulative strain and refine the material structure. This method requires not only many processes, but also requires high process conditions.

[0005] Although the above material preparation methods can refine the internal structure of the material and improve its mechanical properties to a certain extent, due to the characteristics of its own technology, at present, it is mostly limited to laboratory use, and how to transform to industrial production requires some Common basic issues continue to be explored in depth

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