METHOD OF MANUFACTURING JOINT BOOT

摘要

A method of accurately manufacturing a joint boot having a large diameter side mounting part in which outer and inner peripheral surfaces are different in shape from each other. A cylindrical parison (15) formed of a first portion (12) forming the product shape of the large diameter side mounting part (2), a second portion (13) forming the product shape of a small diameter side mounting part (4), and a third portion (14) connecting these both portions (12) and (13 ) to each other is injection-molded by using a molding material. After the parison is cooled, only the third portion (14) among the first portion, the second portion, and the third portion is heated, from the radial outer side, to a set temperature by a heater (B), and then the third portion is covered by an outer mold (51), a gas is jetted to the inner peripheral surface of the third portion, and the third portion is pressed against the outer mold to blow-mold a bellows part (5).