Introduction to the grinding of parts

There are three main types of machine tools used in grinding: surface grinders, internal and external cylindrical grinders, and tool abrasives. During finishing grinding, grinding deformation and grinding cracks must be strictly controlled. Even very small cracks will be revealed in the subsequent processing and use. Therefore, the feed of the fine grinding should be small, not large, the coolant should be sufficient, and the parts with the dimension tolerance within 0.01mm should be ground as much as possible. From the calculation, it can be seen that when the temperature difference of 300mm steel is 3℃, the material will have a change of about 10.8μm, 10.8u003d1.233 (deformation amount per 100mm 1.2μm/℃), each finishing process needs to fully consider the influence of this factor .

It is very important to choose an appropriate grinding wheel during fine grinding. For the high vanadium and high molybdenum condition of the mold steel, the GD single crystal corundum grinding wheel is more suitable. When processing cemented carbide and high quenching hardness materials, it is preferred Organic bond diamond grinding wheels, organic bond grinding wheels have good self-grinding properties, and the roughness of the ground workpieces can reach Rau003d0.2μm. In recent years, with the application of new materials, CBN grinding wheels, also known as cubic boron nitride The wheel shows a very good processing effect. It is better than other types of grinding wheels for finishing on CNC form grinding, coordinate grinder, and CNC internal and external cylindrical grinders. During the grinding process, attention should be paid to dressing the grinding wheel in time to keep the grinding wheel sharp. When the grinding wheel is passivated, it will rub and squeeze on the surface of the workpiece, causing burns on the surface of the workpiece and reducing its strength. (Guide: Introduction to stamping process)

Most of the processing of plate parts is processed by surface grinders. In the processing, a long and thin sheet part is often encountered, and the processing of such parts is difficult. Because the workpiece is deformed under the action of magnetic adsorption during processing, and it clings to the surface of the worktable. When the workpiece is taken off, the workpiece will return to deformation. The thickness measurement is consistent, but the parallelism cannot meet the requirements. The solution Magnetic isolation grinding method can be used. Contour blocks are used to pad under the workpiece during grinding. Blocks on four sides are used to resist the death. During processing, small feeds and multiple smooth knives can be used. After one side is processed, the contour blocks can be directly absorbed and processed. , This can improve the grinding effect and meet the requirements of parallelism.

Shaft parts have a revolving surface, and internal and external cylindrical grinders and tool grinders are widely used for processing. During the processing, the headstock and the top are equivalent to the bus bar. If there is a runout problem, the processed workpiece will also have this problem, which will affect the quality of the parts. Therefore, the headstock and top inspection work must be done before processing. When grinding the inner hole, the coolant should be poured to the grinding contact position to facilitate the smooth discharge of the grinding. For processing thin-walled shaft parts, it is best to use a clamping technology table, and the clamping force should not be too large, otherwise it is easy to produce inner triangular deformation on the circumference of the workpiece.

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