MOLD FOR INJECTION MOLDING BLADE FOR HELICAL COMPRESSOR, MANUFACTURE OF INSERT IN THE MOLD, MANUFACTURE OF BLADE FOR HELICAL COMPRESSOR AND BLADE FOR HELICAL COMPRESSOR

摘要

PROBLEM TO BE SOLVED: To effectively mold a blade without fracture relatively easily even by using a material having scarcely deforming characteristics. ;SOLUTION: The mold 10 for injection molding comprises a fixed side mold 11, a movable side mold 12 movable to the fixed side mold and associated with the fixed side mold, and an insert 13 interposed between the movable side mold and the fixed side mold. In this case, the insert has a predetermined lateral size, and has a hollow material 14 having a spiral cutout part 16 of an irregular pitch along an axial direction through an inner periphery and an outer periphery, and a bar 15 detachably inserted into a hollow part 14a of the hollow material to close an inner peripheral surface opening end of the cutout on the periphery to alter to a spiral groove.;COPYRIGHT: (C)2000,JPO