| 摘要 |
A method of forming a generally L-shaped extrusion (2) from a body of aluminum alloy, the extrusion having good flatness and straightness without the use of a straightening step. The method comprises the steps of providing a body of a precipitation hardenable aluminum alloy and providing an extrusion press having a die for extruding a hollow-shaped tube (10) having a generally rectangular-shaped cross section. The body is extruded to provide the rectangular-shaped tube (10) which is then precipitation hardened to increase its strength. After precipitation hardening, the tube is machined in the longitudinal direction to separate it into two L-shaped members having good flatness and straightness. |
