| 摘要 |
PURPOSE:To improve the joining of a molten metal to he end of a hollow member and to facilitate a knock-out operation in insert casting of the hollow member by connecting and fitting the hollow member into the cavity of casting molds by means of a supporting member thereby eliminating the contact of the aperture of the hollow member with the casting molds. CONSTITUTION:The hollow member 4 is supported in the casting 10 of the casting molds 7, 8 is supported by the sand core supporting member 13 in a manner as not to contact with the molds 7, 8. The molten metal is cast into the cavity 10. Since the member 4 does not contact with the molds 7, 8, the overcooling part in the aperture at the end of the member 4 is prevented and the joining with the molten metal is improved. The quality of the end part is thus made better than in the case in which the conventional hollow member 4 is supported in direct contact with the molds 7, 8. The defects such as the seizure of the member 4 to the molds 7, 8 during the knock-out are eliminated and the knock-out operation is made extremely easy. |
