| 摘要 |
PURPOSE:To easily maintain a specified spacing and to decrease cold shut by providing a tightening means to the outside at the inflow port end of a casting mold so that the spacing between the inside circumference at the inflow port end of the mold and the outside circumference in the cylindrical part of a joint ring to be inserted therein is maintained constant over the entire circumference. CONSTITUTION:The tightening means 17 is provided to the outside at the inflow port end of the casting mold 1 and is tightened to force the reduction of the inside surface at the inflow port end of the mold by which the air gap of the specified small spacing (t) is maintained between said surface and the cylindrical part 11 of the joint ring to be inserted therein. A receiving seat for the means 17 is formed on the outside at the inflow port end of the mold 1 having a square section and the mold in said part is constructed to have the thinner wall thickness to permit easy deformation. A partial band 17a is disposed around the receiving seat part and is fixed at the center on both sides by means of fixing means 18 for tightening. The mold is thereby corrected even if the mold is deformed. The specified spacing is thus easily maintained in the spacing between the inside surface of the mold and the cylindrical part of the joint ring, by which the top end of the ring is insulated of heat and the cold shut is decreased. |
