Injection mold for swash plate type compressor hemispherical shoe

摘要

PROBLEM TO BE SOLVED: To provide an injection molding die for obtaining a hemispherical shoe which does not cause seizure even in a dry lubrication state having no lubrication oil at the start of operation, suppresses deterioration of lubrication characteristics caused by frictional heat generation and deterioration of a strength at the time of manufacture, and is excellent in durability.SOLUTION: An injection molding die 14 which is used for manufacture of a hemispherical shoe for a swash plate type compressor has a substrate that is made of a rigid material and has a hollow portion in a central axis portion, and a resin layer that is formed on the surface of a flat surface portion sliding with a swash plate in the periphery of the substrate and the surface of a spherical surface portion sliding with a piston. The injection molding die 14 includes a movable side mold plate 15 and a fixed side mold plate 16. The movable side mold plate 15 has a concave spherical surface 15a for forming the spherical surface portion and has a core pin 18 fitted into the hollow portion of the hemispherical shoe substrate arranged on a central axis of a cavity 22. The fixed side mold plate 16 has a concave flat surface 16a for forming the flat surface portion and has a gate 21 arranged coaxially with the core pin 18.SELECTED DRAWING: Figure 3