Production process of 7075 aluminum alloy seamless tube

Abstract

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a production process of a 7075 aluminum alloy seamless tube. The process comprises the following steps of proportioning aluminum alloy raw materials in percentage by weight of less than or equal to 0.20% of Si, less than or equal to 0.30% of Fe, 1.5-1.7% of Cu, less than or equal to 0.20% of Mn, 2.5-2.75%of Mg, 0.18-0.23% of Cr, 5.2-5.7% of Zn, less than or equal to 0.12% of Ti, less than or equal to 0.02% of Zr, less than or equal to 0.05% of single impurities, less than or equal to 0.15% of the summation and the balance Al, enabling the aluminum alloy raw materials to be matched with a formula through the procedures of casting, homogenization, concentricity adjustment, extrusion, saw cutting andheat treatment, and successfully extruding the 7075 alloy seamless tube with the performance meeting the requirement.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a production process of a 7075 aluminum alloy seamless pipe. Background technique [0002] Seamless pipe is a main variety of extruded products, and the extrusion production method was originally developed from the extrusion of lead pipes. There are various extrusion methods for seamless pipes, which can be divided into double-action extrusion machines and single-action extrusion machines according to the structure of the extrusion machine. At present, in the field of seamless pipes, single-action follower needles are mostly used for extrusion. Although this method has small friction and extrusion force acting on the perforating needle, it also has disadvantages that cannot be ignored. For example, hollow pipes must be used. Extrusion of ingots and circular piercing needles, the piercing needles have a certain taper along the length direction, and the size dev...

AI Technical Summary

Problems solved by technology

At present, in the field of seamless pipes, single-action follower needles are mostly used for extrusion. Although this method has small friction and extrusion force acting on the perforating needle, it also has disadvantages that cannot be ignored. For example, hollow pipes must be used. Extrusion of ingots and circular piercing needles, the piercing needles have a certain taper along the length direction, and the size deviation of the front and rear ends of the extruded pipe is large, etc.

It is difficult to control the process in the preparation process, but the double-action fixed needle extrusion can overcome the shortcomings of the follower needle, and the seamless pipe products of different specifications only need to replace the needle tip, which reduces the cost of tools, but the fixed needle also has its inherent advantages. Disadvantages, the friction force in the metal flow is large, and needle breakage accidents are prone to occur, thus limiting the use length of the billet to a certain extent

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