| 摘要 |
PURPOSE:To uniform molten metal supplying quantity into a cavity without any remaining molten metal and to improve the productivity without defective casting by supplying the prescribed molten quantity into an injecting sleeve by pushing of a molten supplying plunger according to height from the standard face of the molten metal in a holding furnace. CONSTITUTION:In case of supplying the prescribed molten quantity Vc into the injecting sleeve 36, the height (h) from the standard face Z-Z of the molten surface (b) in the molten holding furnace 34 is detected by a molten surface sensor 82. Further, in case of using K for a coefficient relating to a sectional area of molten passage 46a for molten supplying pipe 46 and an inclined angle of the molten passage, W for sum of a stroke of molten supplying plunger 38 which the molten metal starts to move in the pipe 46 and a stroke of the plunger 38 which the molten metal is required to dislocate from the standard face Z-Z to an inlet 36a of sleeve 36 in the pipe 46, and E for a sectional area of the plunger 38, the prescribed stroke R is calculated in the control part 32 by the calculating expression as shown in the fignre and the prescribed molten metal Vc is supplied into the injecting sleeve 36. At the time of the next pushing by a pressurizing plunger 44, the molten metal is always supplied at constant quantity without any remaining metal in the cavity and so the defective casting is eliminated and the productivity is improved.
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