ROTATION GRIND SIZING PIN FOR WORKING BEARING SURFACE OF OIL IMPREGNATED METAL POWDER SINTERED BEARING

摘要

PURPOSE:To lower the occurrence of fan noise caused by bearings by providing a sizing pin with cross sectional diameter of 0.5 to 5mm, with a sizing surface having surface roughness of 0.1 to 1.0S, and providing cut-outs in the longer direction along the circumference of a sizing surface with equal intervals at places more than two. CONSTITUTION:A rotation grind sizing pin 1 for working the bearing surface of a oil impregnated metal powder sintered bearing is made of carbide tungsten group sintered hard alloys. In this case, the sizing pin is made to be 0.5 to 5mm in cross sectional diameter, and to be 0.1 to 1.0S in surface roughness in a sizing surface 1a. And cut-outs 1b in the longer direction are provided along the circumference of the sizing surface 1a with equal intervals at places more than two. When the bearing surface is worked by the sizing pin 1 as mentioned herein above, the occurrence of fan noise caused by the bearing surface can thereby be prevented.