| 摘要 |
PURPOSE:To surely obtain a casting product having the desired shape so as not to deform an expendable pattern dy fixing the expendable pattern to a base plate and pouring molten metal after embedding the pattern into molding sand together with the base plate. CONSTITUTION:Suitable quantity of the molding sand 3 is charged into lower part in a casting vessel 2 and the expendable pattern 1 fixed with the desired position is laid on the base plate 9. The molding sand 3 is packed in the vessel 2 to completely embed the expendable pattern 1. Successively, the molten metal 5 is poured into inner part of the expendable pattern 1 through a sprue to replace the expendable pattern 1 with the molten metal 5. When the molten metal 5 cools, the desired casting product is obtd. By this method, the deformation of the expendable pattern 1 with the molding sand 3 can be prevented. This method is suitable to casting of a cylinder block, etc., in engine. |
