Mechanical polishing process

Mechanical polishing is made with soft micro grits tools for the final finishing parts surface processing technology. In the process of polishing abrasive brush with the role of the workpiece surface with sliding, the plow, and cutting three states, in a state of these three grinding temperature and grinding force is increasing. Due to abrasive is attached on the soft substrate, so under the action of grinding force, grinding grain will be different degree of retraction to soft matrix, tiny scratches on the surface, to generate tiny chip. Abrasive effect on surface of sliding, the plow, the plastic flow in the surface of components, to some extent improved the microscopic roughness of workpiece surface, form a continuous and smooth surface, so that the surface up to the mirror effect. Because the stainless steel small coefficient of thermal conductivity, great toughness, elastic modulus is small, so the stainless steel in grinding the following problems: ( 1) Grinding force, grinding temperature is higher. ( 2) Chip is difficult to cut off, easy abrasive grinding blunt. ( 3) Prone to deformation. ( 4) Chip easy adhesion grinding wheel. ( 5) Machining surface burn. ( 6) Work hardening trend is serious. Using hard polyvinyl formal formation of the elastomer as a new-type polishing abrasive abrasive carrier by pouring the rule of law and the PVA grinding wheels. Because of the characteristic of the bond itself, makes the PVA grinding wheel has its unique characteristics, its main characteristics are: ( 1) High porosity. It is spongy structure, contains rich small porosity, low grinding heat and not easy to burn the workpiece. ( 2) Elastic, polishing ability. ( 3) Not easy to jam. Is suitable for all kinds of metal and nonmetal polished, especially suitable for polishing toughness is difficult to grind material such as stainless steel, copper alloy and parts for modalities, and used to replace glue wheel, cloth wheel, the polishing efficiency can be improved. The grinding wheel speed, workpiece speed and depth of cut has a larger effect on surface polishing. Grinding speed is different, the workpiece surface quality is different also. When grinding stainless steel material, choose high grinding wheel speed, in order to improve the cutting performance of grinding wheel [ 4] High, but the grinding wheel speed, grinding cut more, grinding wheel easy to jam, prone to burn workpiece machining surface. Workpiece speed will change as wheel speed, workpiece speed will increase as the wheel speed rise, when the wheel speed to reduce the workpiece speed is reduced. When cut depth quantity is too small, cannot cut into the workpiece surface grinding grain, efficiency is too low. When large amount of depth of cut, can make the grinding heat increase, also prone to burn. Use W20WA PVA wheel polishing stainless steel can obtain excellent surface quality. When it is used in the grinding and polishing stainless steel, the workpiece speed of 15 m/min, take radial feeding take 0. 015毫米~ 0。 02 mm, take 36 m/s wheel speed polishing effect is best, general won't produce under the condition of the workpiece burn phenomenon.