Method and apparatus for compacting foundry mold making material about a foundry mold pattern

US4915159A · kind A · utility

Assignee

• BMD Badische Maschinenfabrik Durlach GmbH · DE

Inventors

• Norbert Damm · Karlsdorf-Neuthard, DE
• Ernst Schmitt · Cologne, DE
• Thomas Parr · Karlsruhe, DE

Key dates

• Filing date: Jun 10, 1988
• Grant date: Apr 10, 1990
• Expiry date: Jun 10, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C15/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

To permit close matching of compaction pressure being applied to foundry mold making material, such as foundry sand, to the shape of a mold pattern (2) in a pattern box (3, 4), individual fluid pressure is applied to a plurality of press plungers (7) located on a pressure plate which is moved towards the sand in the mold box at a high rate of speed, the press plungers being biassed by fluid pressure to have a maximum difference (.DELTA.H) in stroke of penetration depth of at least 30% of the height (H) of the mold box; individual valves (14) can apply compressed air to individual cylinders under control, for example, of a microprocessor; the valves can be located in a matrix arrangement (FIG. 3). The method and apparatus can be used in combination with explosion or pressure impulse compaction and fluidizing of the foundry sand.