METAL MOLD FOR MOLDING AND METHOD OF USING THE SAME

摘要

A metal mold capable of providing a sufficient compressive stress to a molding member and enabling an increase in service life since a high tensile stress is not applied thereto even if a hard fragile material is used for the molding member and a method of using the metal mold. A pressurization member (2) is fitted onto the molding member (1) so as to surround the periphery of the molding member, a collet chuck (3) is fitted onto the pressurization member so as to surround the periphery of the pressurization member, and a casing (4) is fitted onto the collet chuck so as to surround the periphery of the collet chuck. Outer peripheral slits (2a) and inner peripheral slits (2b) are formed in the pressurization member (2) alternately at equal intervals along the circumferential direction. A male screw part (3a) is formed at the upper end part or the lower end part of the collet chuck (3), and a tapered surface (3b) reduced in diameter toward the male screw part (3a) side is formed on the outer periphery of the collet chuck. A tapered surface (4a) in surface contact with the tapered surface (3b) is formed on the inner periphery of the casing (4). Then, a nut (6) disposed on the upper or lower side of the casing (4) is tightened with the male screw part (3a) to reduce the diameter of the collet chuck (3) so as to act a compressive stress on the molding member (1).