INJECTION-MOLDING CYLINDRICAL ROTARY COMPONENT

摘要

PROBLEM TO BE SOLVED: To provide an injection-molding cylindrical rotary component which has high rotational precision to be obtained by securing specific shape precision. SOLUTION: The injection-molding cylindrical rotary component is characterized by being made of polyacetal resin (I) having a melt flow rate defined by ASTM D1238 of≥25 g/10 min. The component satisfies <5μm/mm per component height in the parallelism of each cylindricity of the outer periphery and a shaft hole, 20% or more in the fitting ratio to the shaft hole and <10μm/mm per component height in the cylindricity of the outer periphery. COPYRIGHT: (C)2009,JPO&INPIT