How roller polishing work

When mass-producing bearing steel balls, roller polishing is often used. During rough throwing, a large number of steel balls, lime, and abrasives are placed in an inclined can-shaped drum. When the drum is rotated, the steel balls and abrasives are randomly rolled and collided in the drum to remove the convex surface and reduce the surface roughness. Purpose, can remove the margin of about 0.01 mm. Steel balls and fur crumbs are loaded into the barrel during fine polishing, and the surface can be dazzled and bright after continuous rotation for several hours. The polishing of the precision wire ruler is performed by immersing the processed surface in a polishing liquid. The polishing liquid is a mixture of fine chromium oxide powder with a particle size of W5 to W0.5 and an emulsion. The polishing wheel is made of uniformly degreased wood or a special fine felt, and its movement track is a uniform and dense network. The polished surface roughness is not greater than Ra0.01 micron. Observe under a microscope with a magnification of 40 times No surface defects.