Mould for multi-blank equal-channel angular welding extruded molded pipe

Abstract

The invention relates to a mould for a multi-blank equal-channel angular welding extruded molded pipe. An end face of one end of a convex mould is connected with one end face of a liner of an extruding cylinder; the end face of the other end of the convex mould is connected with one end face of a concave mould; during a connecting process, an outlet of each metal flowing channel in the liner of the extruding cylinder is butt-jointed with an inlet of each metal flowing channel on the end face of the matching end of the convex mould; a sized rod at the center of the end face of the matching end of the convex mould and the concave mould is embedded into a welding chamber at the center of the concave mould; and a clearance between the sized rod and the concave mould is as thick as the wall of the formed pipe. According to a method of changing a split-flow mould into the multi-blank entering welding chamber, the blanks are independent from each other, are subjected to equal-channel angular deformation before alloy enters the welding chamber and are welded and extruded after the alloy enters the welding chamber; the alloy split-flow process is efficiently avoided; and the extrusion force is concentrated on equal-channel angular refined grains and welding process, the welding quality is better and the grain size of the products is smaller, so that the better extruded products are obtained.

Description

Technical field [0001] The invention relates to the field of thermal processing, in particular to a forming die for obtaining fine-crystalline magnesium alloy pipes through multi-blank equal-channel corner welding and extrusion forming. technical background [0002] Light-weight alloy pipes such as fine-grained magnesium alloy and aluminum alloy have the advantages of light weight, high specific strength and high specific rigidity. It is very attractive in fields such as aviation, aerospace, bicycles, and portable signal towers. However, most of the traditional processes for making this kind of lightweight alloy pipes use split extrusion, which requires a large extrusion force, and it is often difficult to accurately control the extrusion process parameters, causing the pipe to crack. This is all related to the large squeezing force that is consumed in both the shunting process and the welding process. Moreover, the alloy pipe extruded by the traditional split extrusion method ...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the deformation process has auxiliary materials (such as sleeve and mandrel) to participate in the deformation, after extrusion, the sleeve deformed together with the product is peeled off, and the mandrel deformed together with the product is taken out, which not only increases Subsequent processing of the product also increases energy consumption due to the participation of auxiliary materials in deformation

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