Blow molding die for producing flanged aluminum pipe, flanged aluminum pipe device having the die, and method for producing flanged aluminum pipe

摘要

Even when aluminum is used as a material to be processed when a flange is formed by crushing using a hot blow mold as it is, cracks do not occur on the front surface of the flange to be formed. When a flange forming subcavity SC is provided in a part of a cavity formed by a mold position at the time of blow molding and the blow mold 13 is further closed than the mold position at the time of blow molding, Cavity SC is a blow molding die that forms a flange by crushing an aluminum pipe blow-molded in sub-cavity SC, and the volume of sub-cavity SC at the time of clamping is blown into the sub-cavity SC. By setting it to be smaller than the volume of the aluminum to be formed and crushed, plastic flow is generated at least at the flange tip portion to be formed. [Selection] Figure 3