- Mar 27, 2018 -
Basin sink waste polishing refers to the use of mechanical, chemical or electrochemical effects, so that the surface roughness of the workpiece is reduced to obtain a bright, flat surface processing method. Polishing tools and abrasive particles or other polishing media are used to modify the surface of the workpiece.
Basin sink waste polishing does not improve the dimensional accuracy or geometric accuracy of the workpiece, but it is intended to give a smooth surface or a mirror finish, and sometimes to eliminate gloss (extinction). The polishing wheel is usually used as a polishing tool. The polishing wheel is generally made of multi-layered canvas, felt or leather, and the two sides are clamped by a metal circular plate, and the rim is coated with a polishing agent which is uniformly mixed with micro-powdered abrasive and grease.
During basin sink waste polishing, the high-speed rotating polishing wheel (peripheral speed of 20m/s or more) is pressed against the workpiece, which causes the abrasive to produce rolling and micro-cutting on the surface of the workpiece, thereby obtaining a bright processing surface. The surface roughness is generally up to Ra0.63. ~0.01 μm; When non-greasy matting finish is used, the glossy surface can be matted to improve appearance. When large quantities of bearing steel balls are produced, drum polishing methods are often used.
A large number of steel balls, limes, and abrasives are placed in a tilted can-shaped drum during rough casting. When the drum is rotated, the steel balls and abrasives are randomly rolling and colliding in the cylinder to achieve the removal of the surface convexity and the reduction of the surface roughness. For the purpose, the margin of about 0.01 mm can be removed.
When the fine polishing of basin sink waste is performed, the steel balls and the fur pieces are put into the wooden barrel, and the bright and shiny surface can be obtained by continuously rotating for several hours. The polishing of the precision line ruler is performed by immersing the processing surface in a polishing liquid which is formed by mixing chromia powder having a particle size of W5-W0.5 and an emulsion. The polishing wheel is made of degreased wood or special fine felt. The trajectory of the polishing wheel is a uniform and dense mesh. The surface roughness after polishing is no more than Ra0.01 micron, observed under a microscope with a magnification of 40 times. Not any surface defects. There are also electrolytic polishing methods.