The basic process of grinding process

Grinding can be divided into coarse grind, lapping, with fine, randomness, targeted for grinding principle, and grinding equipment, processing quality is reliable, simple to use range. Grinding is on the basis of finishing with grinding tool and abrasive from the workpiece surface to a thin metal layer of a grinding precision machining method. Size tolerance grade can reach IT5 ~ IT3, Ra value can reach 0. 1 to 0. 008μm。 1. Grinding types: (1) wet grind will liquid abrasive coating or continuous filling in the tool surface, make the abrasive ( W14 ~ W5) Between the workpiece and tool sliding and rolling unceasingly, so as to realize the cutting of the workpiece. More wet research applications. (2) dry grind will abrasive ( W3。 5 ~ W0。 5) Uniform pressure is embedded on the tool surface grinding to needs in the tool surface coated with a small amount of lubricant 'target =' _blank '& gt; Lubricant. Dry grind for lapping. (3) half dry grind abrasives used for paste paste, coarse, lapping all can use. 2. Grinding principle: (1) subtle sex: can be carried out on the workpiece zero. 01 ~ 0. 1 mu m cutting. (2) : the randomness of the workpiece and tool random access, high mutual shaping, error reduced gradually, the accuracy was improved at the same time. (3) targeted: artifacts can be detected, targeted change grinding position and grasp the milling time, guarantee the precision of size and shape. 3. Tool materials and abrasive: 1) Tool material: cast iron grinding hardening and not of hardened steel and cast iron parts. Brass: grinding all kinds of soft metal. 2) Abrasive abrasive: (1) : aluminum oxide, silicon carbide, ferric oxide and cerium oxide, etc. (2) grinding fluid: engine oil, kerosene, animal oil and oleic acid, stearic acid, 4. Note: in the plane of the grinding methods, grinding grinding plane generally after fine grinding. Manual grinding plane, abrasives on grinding plate ( Tool) Handheld artifacts, as a straight line reciprocating movement or '8' glyph. Grinding after a certain period of time, the workpiece turned 90 ° ~ 180 °, in case of the workpiece. For local to grind small workpieces surface, such as flat, square hole, slit can be hand-held tool for grinding. Batch larger simple components on the plane in the plane grinding machine grinding. Ground plane grinding groove 1. When grinding abrasive working condition 1) Between workpiece and tool grinding grain rolling, rolling effect; 2) Grinding grain pressure into the tool surface, with showing the workpiece surface grinding grain of cutting-edge score, realize micro machining; 3) The workpiece rolling and trace on the surface of the abrasive score at the same time. 2. Hard brittle materials due to the role of the grinding pressure, grinding part of grits embedded abrasive disk surface, using above the tip of the micro machining workpiece surfaces; Another part of the grits is between workpiece and grinding disc rolling, rolling effect. When pressurized to grits, is in the largest tensile stress on the surface of the hard brittle materials processing parts produce micro cracks. When the freely crisscross of crack extension and generate brittle crack formation of chip, to achieve the objective of the surface to remove. 3. Grinding with the metal surfaces of metal material indenter trendy, only on the surface of the plastic deformation of the pit, and the brittle material crushing and crack will not occur. When grinding, abrasive grinding effect is equivalent to trace the status of cutting and grinding, and the surface will not produce crack.