| 摘要 |
PURPOSE:To provide a mold which is so made as to enable castings free from defects such as blow holes to be obtained by fitting a pin having a through-hole into the core provided with a recess and removing the gases produced from the core part. CONSTITUTION:A pin 4 having a through-hole 5 at the center is mounted to a metal mold 1, and a recess fitting to said pin 4 is provided to a core 3. When molten metal is poured into this mold, the gases produced from the sand core 3 are exhausted to the outside of the mold by the pin 4 having the through-hole 5, and there is no more back pressure, whereby the casting free from defects such as blow holes is obtained. |
