Stainless steel surface polishing principle
Stainless steel surface treatment, surface polishing is very common, mainly using chemical, mechanical, electrochemical effects, so that the roughness of the stainless steel surface is reduced, making the stainless steel polished and smoother, is a common processing of stainless steel surface treatment method.
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Stainless steel polishing uses a flexible polishing tool and abrasive particles or other polishing media to modify the surface of the workpiece. Polishing does not improve the dimensional accuracy or geometric accuracy of the workpiece, but rather for the purpose of obtaining a smooth surface or specular gloss, and sometimes for eliminating gloss (extinction). A polishing wheel is usually used as a polishing tool. The polishing wheel is generally formed by stacking a plurality of layers of canvas, felt or leather, and the two sides are clamped by a metal circular plate, and the rim is coated with a polishing agent uniformly mixed with fine powder abrasive and grease.
When polishing stainless steel, the high-speed rotating polishing wheel (circumferential speed of 20 m / sec or more) is pressed against the workpiece, causing the abrasive to roll and micro-cut on the surface of the workpiece, thereby obtaining a bright processed surface, and the surface roughness is generally up to Ra 0.63 ~ 0.01 microns; when a non-greasy matting polish is used, the shiny surface can be matted to improve the appearance.
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When mass producing bearing steel balls, the method of barrel polishing is often used. In the rough polishing, a large number of steel balls, lime and abrasive are placed in the inclined can-shaped drum. When the drum rotates, the steel ball and the abrasive are randomly rolled and collided in the cylinder to remove the surface convex surface and reduce the surface roughness. The purpose is to remove the margin of about 0.01 mm.
Among them, steel balls and fur fragments are placed in the barrel during fine polishing, and the surface is rotated for several hours to obtain a dazzling surface. The polishing of the precision ruler is carried out by immersing the processed surface in a polishing liquid, and the polishing liquid is prepared by mixing chrome oxide fine powder having a particle size of W5 to W0.5 and an emulsion. The polishing wheel is made of finely degreased wood or special fine felt. The movement track is uniform and dense mesh. The surface roughness after polishing is not more than Ra 0.01 μm. Observed under a microscope with 40 times magnification. Not any surface defects. In addition, there are methods such as electrolytic polishing.