Decomposable passage-way forming core
AssigneeSaab-Scania Aktiebolag, Sodertalje
InventorHans Sigvard Wahlqvist
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method for forming a canal when moulding a metal block, said canal being defined by a core inserted into the mould. The method involves using a core comprising a tube of powdered or granulated refractory material held together by an organic binding agent, and a rod located within the tube, coating the core with a blacking agent prior to moulding, carrying out the moulding operation and simultaneously combusting the binding agent and leading off gases through the core, and finally removing the rod and clearing away the remnants of the tube in the canal formed. The invention also provides a core suitable for use in said method.
Claims9
A decomposable, passage-way forming core for use in a mold during the molding of molten material comprising:
- a separate preformed tube of powdered or granulated refractory material held together by an organic binding agent which is thermally decomposable at a temperature below the melting point of the molten material being molded and which gives off little gas when thermally decomposed;
- and an elongated reinforcing member disposed within the bore of said tube in contact therewith so as to support said tube during the molding operation and be removable from said tube upon completion of the molding operation, said elongated reinforcing member forming with the bore of the tube at least one longitudinally extending vent.
Dependencies are inferred from the claim text.