6063 aluminum alloy profile extrusion grain control process

Abstract

The invention belongs to the technical field of aluminum alloy extrusion, and relates to a 6063 aluminum alloy profile extrusion grain control process. The aluminum alloy raw materials are composed of0.50% to 0.55% of Si, less than or equal to 0.15% of Fe, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Mn, 0.45% to 0.50% of Mg, less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.05% of Ti, less than or equal to 0.05% of other single impurity, less than or equal to 0.15% of total impurity, and the balance Al, and the Si content is more than the Mg content, so that excess silicon is controlled between 0.25% to 0.30%. according to the 6063 aluminum alloy profile extrusion grain control process, an aluminum alloy ingot prepared by the process is subject to artificial aging after extrusion, online water-cooling quenching and stretch straightening, through the strict control of various process parameters, extruded products can meet the high precision standard of the extrusion tolerance GB / T14846, the yield strength is more than and equal to 210Mpa, the tensile strength is more than and equal to 230MPa, the elongation is morethan and equal to 10%, the elongation is far higher than the national standard, and especially, the average grain size which is less than and equal to 100mum is far better than the domestic average level of 200mum.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy extrusion, and relates to a 6063 aluminum alloy extrusion grain control process. Background technique [0002] With the rapid development of automobile manufacturing technology, aluminum alloys are more and more used in automobile structural parts due to their light weight, moderate strength, high energy absorption and many other advantages. More performance requirements are put forward for the traditional 6063 alloy. In particular, the demand for grain size is developing towards a finer and more uniform direction. At present, in the domestic aluminum extrusion industry, the 6063 aluminum alloy is limited by its own chemical composition, which determines that its grain size is basically around 200 μm, which is difficult to achieve. The requirements of foreign customers below 100 μm have seriously restricted the export of high-end aluminum profiles in my country. A kind of thin-walled 6063 pi...

AI Technical Summary

Problems solved by technology

[0003] In view of this, in order to solve the problem that the existing 6063 aluminum alloy processing technology cannot meet the requirement of alloy average grain size ≤ 100 μm, the present invention provides a 6063 aluminum alloy profile extrusion grain control process