Multi-region heterogeneous material composite structure warm extrusion die and its preparation method

Abstract

The present invention disclosed a warm squeezing mold in the composite structure of multi -region heterogeneous materials. In the direction of the axial direction of the mold, the mold is divided into the unchanged area and the cross -corner transition area. Among themThe area of unchanged areas and the cut -off area reduces the area of the rounded corner transition are all prepared by alloy powder through additive manufacturing technology;The rounded transition area is made of composite material powder prepared with tungsten carbide or chromium carbide and self -fused alloy powder.The multi -regional heterogeneous material composite structure proposed by the present invention can improve the comprehensive performance and service life of the mold, and use the materials reasonably.

Description

technical field [0001] The invention relates to the technical field of extrusion dies, in particular to a multi-region heterogeneous material composite structure warm extrusion die and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry and the increasingly fierce competition in the international market, the manufacturing and forming technology of auto parts with high performance, high precision, low cost, energy saving and consumption reduction has become an inevitable trend in the development of the automobile industry, and it is also the key to improving product competitiveness. best way. Due to the advantages of high production efficiency, high material utilization rate and high dimensional accuracy of formed parts, cold extrusion forming technology is widely used in the production of important automobile shaft parts such as camshafts and gear shafts. Due to the limitation of material deformation resistance a...

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Problems solved by technology

[0004] At present, researchers have proposed many methods on how to improve the life of warm extrusion dies, such as improving the forming process, optimizing the die structure, selecting advanced high-temperature die materials, and performing surface strengthening treatment on the die, etc., although in some conditions It has achieved a certain effect, but there are still shortcomings, which are mainly reflected in: (1) the mold cavity is difficult to optimize the mold cavity size and mold structure due to the limitation of the shape and size of the workpiece; ( 2) Due to the different forces between the blank and the surface of the mold in different areas of the mold, the wear of different positions of the mold is uneven, and the wear of local areas is serious, and the optimized area of ​​​​the mold cavity shape and size cannot be maintained for a long time during the wear process, resulting in optimization failure; (3 ) Large-volume high-temperature materials are used, which can not make rational use of materials and cause waste of mold materials, and it is difficult to exert the performance of materials

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