There are three main types of machine tools used for grinding: surface grinding machines, inner and outer cylindrical grinding machines, and tool grinding tools.
During precision machining and grinding, it is necessary to strictly control the occurrence of grinding deformation and grinding cracks. Even very small cracks will be exposed in subsequent processing and use. Therefore, the feed for precision grinding should be small and not large, the coolant should be sufficient, and parts with a dimensional tolerance of less than 0.01mm should be ground at a constant temperature as much as possible. According to calculations, for a 300mm long steel piece, when the temperature difference is 3 ℃, the material has 10.8 μ M [10.8=1.2 x 3 x 3 (1.2 deformation per 100mm) μ The variation of around m/℃ requires full consideration of the influence of this factor in all precision machining processes.
Choosing the appropriate grinding wheel is crucial for precision grinding. Choosing GD single crystal corundum grinding wheel is more suitable for the high vanadium and high molybdenum situation of mold steel; When processing hard alloys and materials with high quenching hardness, priority should be given to using diamond grinding wheels with organic binders. The organic binder grinding wheel has good self grinding efficiency and the roughness of the ground workpiece can reach Ra=0.2 μ M.
In recent years, with the application of new materials, CBN grinding wheels, also known as cubic boron nitride grinding wheels, have shown very good processing effects. They are used for precision machining on CNC forming mills, coordinate grinders, and CNC inner and outer circular grinders, with better results than other types of grinding wheels. During grinding, it is important to promptly adjust the grinding wheel and maintain its sharpness. When the grinding wheel becomes dull, it may slide and squeeze on the surface of the workpiece, causing surface burns and a decrease in strength.
The majority of plate parts are processed using a flat grinder. In processing, it is common to encounter a long and thin thin thin plate part, which is difficult to process. Because during processing, under the adsorption of magnetic force, the workpiece undergoes deformation and adheres closely to the surface of the workbench. When the workpiece is removed, it will undergo recovery deformation again. The thickness measurement is consistent, but the parallelism does not meet the requirements. The solution is to use the magnetic isolation grinding method, which means that during grinding, an equal height block is placed under the workpiece, and all four blocking blocks are used to resist it. When processing, small feed and multiple light knives are used. After processing one side, there is no need to place an equal height block and it can be directly adsorbed for processing. This can improve the grinding effect and meet the parallelism requirements.
Axis parts have a rotating surface and are widely processed using internal and external cylindrical grinders and tool grinders. During the machining process, the head frame and tip are equivalent to busbars. If there is a jumping problem, the processed workpiece will also have this problem, which affects the quality of the parts. Therefore, it is necessary to do a good job of testing the head frame and tip before machining. When grinding the inner hole, the coolant should be fully poured into the grinding contact position to facilitate the smooth discharge of the grinding. When processing thin-walled shaft parts, it is best to use a clamping process table, and the clamping force should not be too large, otherwise it is easy to produce "inner triangle" deformation on the circumference of the workpiece.

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Post time: 2024-04-23 15:36:56