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[ Polishing
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 Polishing also consist of Grinding which is the first operation done by us for the smoothen surface. Grinding & Polishing are two abrasive processes for shaping and smoothing hard materials such as metal. Polishing uses extremely fine abrasive substances, such as putty powder, and emery dust, to rub or burnish an extremely smooth and brilliant finish on the surface of a material. The polishing materials are coated on the surface of cloth, felt, or leather wheels. One special type of polishing wheel is made of soft rubber with the abrasive grains molded into it.
Other two special finishing operations are also used in metalworking which are honing and lapping. Honing improves the accuracy and finish of automobile cylinder bores, hydraulic cylinders, and similar parts. Lapping is done by rubbing a surface with an abrasive lubricated with oil, grease etc. This operation is usually performed with a tool called a lap that matches the contour of the surface being finished. The lap is spread with a thin layer of the abrasive, and the two parts are then rubbed together with irregular strokes.
Grinding is actually a cutting operation in which each grit that comes in contact with the material cuts out a minute chip. Grinding wheels usually consist of emery cloth or leather coating used on the wheel. Grinding can be coarse or fine, depending on the size of the grit used in the grinding wheel & the requirement of the product. Metal and glass can be ground to a mirror finish.
Grinding machines are machine tools equipped with precision grinding wheels and suitable means for holding, positioning, rotating, or traversing the work-piece so that it can be ground to the desired size, shape, and finish. The grinding wheel is mounted on a motor-driven spindle. Grinding machines are usually classified according to the shape of the work-piece being ground (i.e. Axle, Chainwheel & Crank Shaft), the manner in which it is held or supported, and the structure of the machine. |
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