Process of and apparatus for casting metals without sprues

US5447188A · kind A · utility

Assignee

• Bachmann Giesserei und Formenbau GmbH & Co. KG · DE

Inventors

• Peter Srostlik · Maintal, DE
• Alfred Walter · Essen, DE

Key dates

• Filing date: Sep 17, 1993
• Grant date: Sep 5, 1995
• Expiry date: Sep 17, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22D18/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Liquid metal is supplied from the bottom to the top into a casting mold by way of a casting runner and a filling hole arranged at the lowest point of a casting mold. Direct further use of the casting by avoiding formation of a sprue that must be subsequently processed is possible due to the fact that after totally filling the casting mold and only partial solidification of the metal therein, the casting pressure is decreased or turned off, so that liquid metal flows back out of the casting mold only through a return flow channel having a cross section significantly smaller than the cross section of the casting runner. A ram having a face corresponding in size and shape to the outer contour of the casting in the region of the filling hole is pushed at least over the last segment of the casting runner, thus displacing liquid metal present in the last segment into the casting mold sufficiently far in the direction of the mold interior until the fact of the ram aligns with the inner contour of the casting mold.