| 摘要 |
PURPOSE:To improve the yield of a material by providing induction heating coils to the runner parts connecting a central sprue and a casting mold and heating the runners so as to prevent a molten metal from solidification in the stage of casting thereby eliminating the defective product to be resulted from solidification of the molten metal in the runners and making the runners smaller. CONSTITUTION:A molten metal B is poured through a central sprue 4B and runners X into casting molds 1B. Induction heating coils Z are embedded in the runners X and the runners X are heated to the temp. equal to the temp. of the molten metal to prevent the molten metal from being cooled in the runners X. The manufacture of a defective product by the solidification of the molten metal B in the runners X is eliminated by such mechanism. Since the runners X can be made small, the yield of the material is improved, the need for exerting pressure to the metal B is eliminated and the cost is reduced. |
