Device and process for making thin-walled wax models for lost-wax casting

US4539168A · kind A · utility

Assignee

• BBC Brown, Boveri & Company Ltd. · CH

Inventors

• Manfred Brugger · Winnenden, DE
• Peter Vogt · Wien, AT

Key dates

• Filing date: Sep 22, 1982
• Grant date: Sep 3, 1985
• Expiry date: Sep 22, 2002

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C33/44
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In order to remove a thin-walled wax model adhering to the walls of a first core piece and a second core piece, after solidifying, from a multi-part device for making thin-walled wax models, without damaging the wax model, after the external pressure is released, a mold-opening moment is generated simultaneously and abruptly in axially opposite directions by spring-loaded push-off bolts or directly by leaf springs in the upper parting faces and lower parting faces of the device. As a result, both the lower closing plate and the upper closing plate are separated from the annular casing and the wax model is separated from the core pieces, by a maximum of 3 mm, axially in opposite directions because the adhesion of the wax model to the walls of the core arrangements is overcome simultaneously and abruptly. Subsequently the two core arrangements and the casing are transported away from one another in an axial direction relative to one another, so that the wax model is freed.