METHOD AND DEVICE FOR MANUFACTURING SEPARABLE PERMANENT METAL MOULDS Russian patent published in 1995 - IPC

FIELD: foundry engineering. SUBSTANCE: pattern, members for formation of technological hollows, centering pins are put into a flask filled up with moulding mixture. The second flask is set up and the first part of the mould is cast in a metal semi-mould formed by metal walls of the first flask and moulding mixture surface. The moulding mixture is removed, surface of the joint of cast part of the mould is coated with heat-insulating separating layer. Centering bushings are set up on poured pins and the second part of the mould is cast in a metal mould, which is formed by the walls of the second flask and the joint surface of the first cast semi-mould. Device for manufacturing permanent metal moulds has semi-moulds side walls of which are made up as metal plates articulated with each other in the form of closed polygon. Polygons are set up one on another and clamped between the foot boards with the help of tightening pins with fixing units on their ends. Besides device has mechanism for lifting the foots and mechanism for turning semi-mould around horizontal axis. EFFECT: improved quality. 4 cl, 19 dwg