Several matters needing attention when extruding 6082 aluminum alloy profiles
(1), aluminum alloy cast rod heating method
Aluminum alloy cast rod heating uses power frequency induction heating, the characteristics of this thermal mode:
a, heating time is short, can reach 500 °C in 3 minutes;
b, the extrusion temperature control is accurate, the error does not exceed ± 3 ° C.
If it is slowly heated by a resistance furnace, it will cause the Mg2Si phase to precipitate, which will affect the strengthening effect.
(2), aluminum extrusion
The following factors were changed and the 6082 alloy aluminum extrusion process was rationally formulated.
1, 6082 alloy deformation resistance is large, so the temperature of the cast rod should be upper limit (480-500 ° C);
2. The temperature of the aluminum extrusion die should also be high;
3, in order to prevent shrinkage or bubbles, oxide scale, impurities involved, the pressure should be kept longer;
4, in order to make the alloy main strengthening phase Mg2Si completely solid solution, the quenching temperature must be above 500 ° C, the extrusion extrusion temperature of this profile should be controlled at 500-530 ° C;
5, 6082 aluminum alloy quenching sensitivity is high. The alloy contains Mn, which promotes the formation of intrametallic intermetallic compounds and has an adverse effect on quenching performance. It is required to have high quenching cooling strength and fast cooling speed, and the temperature must be rapidly lowered to below 50 ° C by water quenching;
6, after the 6082 aluminum alloy profile sawing, the frame should be protected at a certain interval, and should not be discharged too dense.
