Manufacturing process for die-cast light-metal wheels of passenger cars

US4995917A · kind A · utility

Assignee

• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Amer Dagustany · Munich, DE
• Jochen Spriestersbach · Bornheim, DE
• Bernd-Rainer Gunther · Garching bei München, DE
• Gerhard Knall · Munich, DE

Key dates

• Filing date: Mar 27, 1989
• Grant date: Feb 26, 1991
• Expiry date: Mar 27, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C21/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A manufacturing process for die-cast light-metal parts, particularly die-cast light-metal wheels for passenger cars using gravity die-casting process using an almost eutectic refined GK-ALSill/Sr-kf alloy having 0.05 to 0.1% parts by weight of magnesium and without any additional significant hardenable constituents. The die-cast wheel is subject to quenching from a temperature of 350.degree. C. to 475.degree. C. immediately after its removal from the die in water of no more than 50.degree. C., and as a result, a considerable increase of the bending fatigue strength in central areas, and of the impact resistance in the edge areas of the wheel is achieved.