| 摘要 |
PURPOSE:To prevent generation of fin in casting, by inserting a plate through a leg part between a model mounting molding board provided with a model having the leg part of prescribed length, and a mold frame, and molding the casting sand, and after that, pattern-drawing the molding board. CONSTITUTION:A model 2 and a gate stick 4 are fixed to a model mounting molding board 1, and after that, a guide pin 3 and the gate stick 4 are made to pass through the fit-through port of a plate 6, the plate 6 is superposed on the board 1 so as to be idly fitted into a leg part 2a of the model 2, and also a mold frame 7 is superposed. A parting agent is applied onto the plate 6 and the model 2, and after that, the casting frame 7 is filled with casting sand 8, and the parts A, B, C and D of the model 2 are surrounded by the casting sand 8. After molding, pattern drawing is executed by depressing the board 1. In this way, since the pattern drawing is executed by use of the plate 6, a drawing incline can be set to about >=1.0, and since the casting sand 8 is pushed up in a state that it has been depressed by the plate 6, and is separated from the board 1, a casting fin is not generated, and it is unnecessary to provide a circular arc part on the model 2. |
