Process for mixing foundry molding materials

US4818112A · kind A · utility

Assignee

• BMD Badische Maschinenfabrik Durlach GmbH · DE

Inventors

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

Key dates

• Filing date: Aug 22, 1986
• Grant date: Apr 4, 1989
• Expiry date: Aug 22, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C5/0409
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a process for mixing wet molding materials, particularly wet molding sands used for foundry purposes, the dry components of the molding materials are premixed in a container and, following the premixing of the moist components of the molding materials, are added and then homogenized with the dry components by further mixing. To reduce the mixing time, improve the mixing result and prevent contamination of mixer parts above free surface level of the dry components, the moist components are added under an overpressure to the premixed dry components below the surface level of the premixed dry components.