History of grinding machines.
In the 1830s, grinding machines using natural abrasive wheels were developed in England, Germany and the United States respectively to accommodate the processing of hardened parts of clocks, bicycles, sewing machines and firearms. These grinders were made by adding grinding heads to ready-made machine tools such as lathes and planers, which were simple in structure, low in rigidity, prone to vibration during grinding, and required a high degree of skill on the part of the operator to grind a precise workpiece. It had a workpiece headstock and tailstock mounted on a reciprocating table, a box-shaped bed to improve machine rigidity, and an internal grinding attachment. 1883, this company made a surface grinder with the grinding head mounted on a column and the table moving reciprocally. around 1900, the development of artificial abrasives and the application of hydraulic transmission gave a great impetus to the development of grinding machines. With the development of modern industry, especially the automobile industry, various types of grinding machines were introduced one after another. For example, at the beginning of the 20th century, has developed the processing of cylinder block planetary internal grinding machine, crankshaft grinding machine, camshaft grinding machine and piston ring grinding machine with electromagnetic suction cups, etc.. Automatic measuring device in 1908 began to be applied to grinding machines. Around 1920, centerless grinders, double-end grinders, roll grinders, guide grinders, honing machines and super-finishing machines were made; in the 1950s, high-precision cylindrical grinders for mirror grinding appeared; at the end of the 1960s, high-speed grinders with a grinding wheel line speed of 60 to 80 m/s and large depth of cut, slow feed grinding surface grinders appeared.
Uses of grinding machines.
Grinding machines can process harder materials, such as hardened steel and carbide; they can also process brittle materials, such as glass and granite. The grinder can make grinding with high precision and very small surface roughness, and can also perform high-efficiency grinding, such as powerful grinding. A grinding machine is a machine tool that uses abrasives to grind the surface of a workpiece. Most grinders use high-speed rotating grinding wheels for grinding processing, and a few use other abrasives such as oil stones, abrasive belts, and free abrasives for processing, such as honing machines, super-finishing machines, belt grinders, grinding machines, and polishing machines.
1. mainly surface grinding machines, for processing flat surfaces.
2. To improve the roughness of the processing surface.
3. Grinding away a few wires to facilitate assembly.
Classification of grinding machines
1. Cylindrical grinder: The base series of the general type, mainly used for grinding cylindrical and conical external surfaces.
2. Internal cylindrical grinder: This is the base series of the general type and is mainly used for grinding cylindrical and conical internal surfaces. In addition, there are grinders for both internal and external grinding.
3. Coordinate grinding machines: Internal grinding machines with precision coordinate positioning devices.
4. Centerless grinder: A grinder in which the workpiece is centerlessly clamped, generally supported between the guide wheel and the bracket, and the workpiece is driven by the guide wheel to rotate, mainly for grinding cylindrical surfaces. It is mainly used for grinding cylindrical surfaces, such as bearing shafts, etc.
5. Surface grinder: A grinder mainly used for grinding the flat surface of workpieces. The hand grinder is suitable for processing smaller size and higher precision workpieces, and can process various shaped workpieces including curved surfaces, flat surfaces, slots, etc. The big water grinder is suitable for processing larger workpieces with low processing accuracy, which is different from the hand-operated grinder.
6. Abrasive belt grinder: A grinder for grinding with a fast-moving abrasive belt.
7. Honing machine: mainly used for processing various cylindrical holes (including light holes, axial or radial interrupted surface holes, through holes, blind holes and multi-step holes), also capable of processing conical holes, elliptical holes, and residual cycloidal holes.
8. Grinder: grinder for grinding workpiece planes or cylindrical internal and external surfaces.
9. Guide grinding machine: Grinding machine mainly used to grind the guide surface of machine tools.
10.Tool grinding machine: Grinding machine used for grinding tools.
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