Patent ID: 6507999
Filing Date: 2003-01-21
Classification: B21J,B21K,F02F,Y10T

Abstract:
A piston production method for producing an internal combustion engine piston, the method comprising:forging a billet from an initial billet comprising an aluminum alloy that comprises silicon, intermetallic particles, and injected hardening particles, the forging is conducted under at least one of super-plasticity and hot deformation conditions; heat treating the forged billet; wherein the forging comprises forging at a temperature in a range from about 0.8 Tmelt to about 0.98 Tmelt the forging also comprising forging at a strain rate in a range from about 5Ã—10âˆ’2sâˆ’1 to about 5Ã—10âˆ’5sâˆ’1, the piston being formed with a configuration that enables other parts to be connected to the piston, and the initial billet comprises at least one of: coarse grain silicon, intermetallic particles, and injected hardening particles having at least one of a lamellar, comprehensive shape, and fine grain silicon, intermetallic particles, and injected hardening particles being globular in shape, and the silicon, intermetallic and injected hardening particle volume content is in a range from about 25% to about 60%, and an average grain size of the silicon, intermetallic, and injected hardening particles is less than about 15 &mgr;m2.