Process and apparatus for the uphill low pressure casting of metal, particularly light metal

US6321825A · kind A · utility

Assignee

• Georg Fischer Disa A/S · DK

Inventors

• Norbert Damm · Karlsdorf-Neuthard, DE
• Herbert Zulauf · Feuerthalen, CH

Key dates

• Filing date: Apr 29, 1999
• Grant date: Nov 27, 2001
• Expiry date: Apr 29, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22D33/005
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the case of uphill low pressure casting of metals, particularly light metal, a casting mold is connected by its gate, via a riser to a melting container and the melt contained therein is displaced under pressure through the riser into the mold. For increasing the casting capacity while maintaining a high quality of the casting, most of the melt volume necessary for filling the mold is displaced into the latter at the maximum casting speed, then the melting column in the riser is sheared and a residual volume remaining between the shearing point and the gate is displaced into the mold with a negative speed gradient. An apparatus for performing the above process is includes a tubular portion provided between the riser and the gate, the tubular portion forming a residual volume, an opening being formed between the riser and the tubular portion. A controlled displacer is movable at controlled speed between a casting position freeing the opening between the riser and the tubular portion, via an intermediate position closing the opening, into an end position closing the gate