| 摘要 |
PURPOSE:To automate melting and casting strokes and to produce a casting having good quality with good efficiency in a device for casting a small-sized casting under a nonoxidative atmosphere by controlling the same in accordance with the storage of the current and time value for heating and heat insulating in casting conditions. CONSTITUTION:Heating current IH is impressed by a circuit 5 on an induction coil 7 to melt the metal M in a crucible 6. The current IH is controlled to a target value IHf as the output of a resistor 10 for detecting said current and the signal set in a circuit 11 are compared in a circuit 12 and a circuit 15 is operated by a circuit 13. The time tf when the metal M attains the m.p. thereof is measured visually and said time is stored as a set value tf, for the melting time with respect to casting conditions such as the kind, melting amt., atmosphere, etc. of the metal in the circuit 16M of a computer 16. The holding time tc after the thorough melting of the metal until casting is set in a circuit 17 and when said time is set, a photocoupler 14 is conducted, and the current IHC enough to maintain the metal M at around the m.p. during this time is detected by the manual operation of the circuit 11. The melting state of the metal M is visually observed and is stored as the set value IHC for heat insulation in a circuit 16M. The control is accomplished by the output of the computer 16 after the end of the actual measurement. |
