Apparatus for compacting foundry mold making materials

US4609033A · kind A · utility

Assignee

• BMD Badische Maschinenfabrik Durlach GmbH · DE

Inventors

• Alfons Kobel · Karlsruhe, DE
• Norbert Damm · Karlsdorf-Neuthard, DE
• Werner Geiger · Ebikon, CH
• Gunter Muller · Karlsruhe, DE

Key dates

• Filing date: May 21, 1985
• Grant date: Sep 2, 1986
• Expiry date: May 21, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C15/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a process for compacting foundry mold making material, that is loosely heaped in a closed mold space over a pattern, the surface of the material is acted on by a compressed gas with a pressure of at the most 8 bar. This gas is caused to undergo expansion out of an inlet space through a valve in an opening at a gas flow rate of over 50 kg/sec and with a pressure increase rate of over 300 bar/sec, into the mold space. The maximum pressure in the inlet space or antichamber is 20 bar. An apparatus for use in the method is made up of a pressure vessel, a mold flask placed thereunder having a filling frame and a pattern plate. The opening cross section of the valve is 50 to 150% of the horizontal cross section of the mold flask and is opened in a short time of the order of milliseconds.