| 摘要 |
PURPOSE:To cut a molten metal in the part of a desired sprue length and to prevent the generation of inconveniences such as clogging and galling in the sprue part of a die by measuring the cutting temp. with a temp. sensor. CONSTITUTION:The molten metal in a furnace passes through a stoke 4 and is poured into the product cavity 10 of the die 7 when the pressurized gas is supplied into the furnace through a pressurizing gas inlet and outlet port 6 after die clamping. The signal from a control device 21 is transmitted to a valve 20 of an air supply source 19 and a valve 20 is opened when a thermocouple 13 detects the solidifying temp. of the molten metal 2 near the sprue part 12. The pressurizing air is conducted through an air supply hole 17 to a ring groove 14 and is discharged through an air discharge hole 18 on the opposite side; at the same time, part thereof is introduced through a ring groove 14 and air injecting slit 16 having 0.2-0.3mm depth into the cavity of the sprue part. Blows are generated in the part where the air is introduced and the vertical bond connecting said part is weakened. The molten metal in the mid-way of the solidification is cut from the part where the air is injected and is returned by the own weight into the molten metal 2 in the furnace.
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