Extrusion method of metal composite board

Abstract

The invention discloses an extrusion method of a metal composite board. The extrusion method of metal composite board comprises the following steps: firstly, laminating and fixing homogeneous or heterogeneous metal blocks together; secondly, adding the raw material into an extruding barrel for extruding, and extruding the homogeneous or heterogeneous metal blocks from an extruding mould port simultaneously in the extruding process to obtain an extruded composite board, wherein in the extruding process, macroscopic sliding between the metal blocks on the two sides of each contact interface between the metal blocks does not exist, and extruding flow velocity difference of the same metal block between a position near the contact interface and a position far away from the contact interface exists. According to the extrusion method of the metal composite board, relatively large shear stress is introduced into the same metal block, so that grains can be significantly refined and the texture can be significantly weakened; according to the extrusion method of the metal composite board, only an extruding composite way is required to be changed and the extruding barrel is not required to be redesigned, so that the extrusion method of the metal composite board has relatively high production and research values.

Description

technical field [0001] The invention belongs to the field of metals and alloys, and relates to a metal forming method, in particular to a method for synchronous extrusion processing to produce metal composite plates. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good thermal conductivity and damping performance, excellent electromagnetic shielding performance and machining performance, and has a wide range of application values ​​in various fields such as aerospace, automobiles, electrical appliances, and communications. Since the crystal structure of magnesium alloy is hexagonal close-packed and lacks an independent slip system, processing is difficult. So far, most magnesium alloy products are mainly produced by casting, but casting products have shortcomings such as coarse structure and many defects, which lead to unsatisfactory mechanical properties, which greatly restricts the wide application of magne...

AI Technical Summary

Problems solved by technology

Although these two methods both add magnesium and aluminum to the extruder simultaneously for extrusion, their purpose is mainly to form an aluminum alloy protective layer on the surface of the magnesium alloy, thereby improving its corrosion resistance, and in these two methods, the magnesium alloy is completely Covered by aluminum alloy, the lateral flow of the magnesium alloy extruded sheet is limited by the clad aluminum during extrusion, which easily produces uneven lateral distribution, which eventually leads to uneven lateral structure and properties of the entire composite material, and serious anisotropy , can not meet the requirements of use well; in addition, during the extrusion process of this method, the magnesium alloy is not in contact with the extrusion cylinder as a whole, and it is in a state of symmetrical stress along the thickness direction (the deformation process of the magnesium alloy is the same as that of the ordinary magnesium alloy when extruded symmetrically. similar, cannot improve the basal texture of magnesium alloys)

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