The grinding machine is a type of tool that is utilized for grinding work pieces. It basically use an abrasive wheel as the cutting tool. The rough surface of the abrasive wheel shreds off small portions of the work piece as required. It is also known as a grinder.
A grinder is generally used to precisely shape and finish the given materials with low surface roughness and high surface quality. It is primarily a finishing operation that removes relatively small quantities of metal, to deliver highly accurate products. However, certain grinding applications also involve swiftly eliminating high volumes of metal.
It comprises of a bed with a fixed guide to hold the work piece; and a power driven wheel that spins at a predetermined speed. The head of the grinder can be set to move across a fixed work piece; or the work piece can be moved while the head remains in a stationary position. The position of the grind head or table can be fine controlled by using a hand wheel, or a computerized numeric controller.
It generate considerable amounts of heat; hence coolants are used to cool the work piece to avoid overheating, prevent accidents and maintain its tolerance. In some high accuracy grinding machines such as the hydraulic cylindrical grinders and surface grinders; the final processes generate relatively little heat; thus coolants are not needed as the temperature is tolerable.
Grinders are used in engineering, electrical, automobile and many other industries. The various types of these tools are as follows:
A bench grinder is manually operated and normally has two wheels of different grain sizes that are fixed on a floor stand or work bench; to perform roughing and finishing operations. It is mainly used to shape tool bits; and repair or make various tools.
A belt grinder includes a machining process to grind metals and other materials, with the help of coated abrasives. Belt grinding is a versatile process that involves several kinds of applications such as stock removal and finishing.
A jig grinder is used for finishing jigs, dies, and fixtures. It grinds holes and can be used for complicated surface grinding and finishing work. A gear grinder is used to remove the last few inches of material while manufacturing high precision gears.
There are two types of cylindrical grinders, one that has a center and the other is center less. A cylindrical grinding machine may have multiple grinding wheels. Here the work piece is rotated and fed through the wheels to form a cylinder. It is widely utilized to manufacture accurate objects like tubes, rods, bushings, bearings, and other parts.
Grinding is a machining process that takes a very light “cut” using abrasive media—typically an abrasive grinding wheel. Grinding wheels with different grit sizes achieve rougher or finer grinding passes, according to the needs of the application. When precise accuracy and/or surface finish are required, grinding is often used as a finishing process after some other metalworking operation. Grinding is also an effective process for machining workpiece materials that are too hard for milling or turning. Grinders for round parts include cylindrical and centerless grinders. Grinders for flat surfaces are called surface grinders. Form grinders move the work and/or the wheel in various axes to grind surfaces that are precisely contoured. Grinders used to create and sharpen cutting tools are called tool & cutter grinders.