Production process of 7075 aluminum alloy seamless tube
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A production process and aluminum alloy technology, which is applied in the field of aluminum alloy manufacturing, can solve the problems of difficult process control, large pipe size deviation, and large friction force, and achieve the effects of reducing effective contact area, ensuring quality, and reducing friction force
Active Publication Date: 2021-03-09
CHINA ZHONGWANG
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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.
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Embodiment 1
[0029] A kind of production technology of 7075 aluminum alloy seamless pipe, comprises the following steps:
[0030] A. Ingredients: The aluminum alloy raw materials for preparing aluminum alloy seamless pipes are mixed according to weight percentage, namely: Si: 0.06%, Fe: 0.13%, Cu: 1.57%, Mn: 0.02%, Mg: 2.72%, Cr: 0.19%, Zn: 5.36%, Ti: 0.03%, Zr: 0.007%, single impurity ≤ 0.05%, total ≤ 0.15%, the balance is Al;
[0031] B. Melting and casting: Put the prepared aluminum alloy raw materials in a melting furnace to melt into liquid aluminum alloy at a melting temperature of 720-750°C. During the melting process, turn on electromagnetic stirring and remove slag, and then pour the melted aluminum alloy into Refining in a refining furnace with a refining temperature of 710-750°C, using Cl-Ar mixed gas for refining and slag removal to obtain aluminum alloy solid ingots;
[0032] C. Homogenization: The aluminum alloy ingot is subjected to homogenization heat treatment in a homogeni...
Embodiment 2
[0038] The difference between Example 2 and Example 1 is that in step A, the aluminum alloy raw materials for preparing aluminum alloy seamless pipes are mixed according to weight percentage, namely: Si: 0.06%, Fe: 0.13%, Cu: 1.55%, Mn: 0.02%, Mg: 2.62%, Cr: 0.19%, Zn: 5.36%, Ti: 0.03%, Zr: 0.007%, single impurity ≤ 0.05%, total ≤ 0.15%, the balance is Al.
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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...
Claims
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