The grinding quality of the CNC internal grinding machine also depends to a large extent on the grinding wheel. Grinding wheel plays a key role in the grinding quality of CNC grinding machine. We often use electroplated grinding wheel, resin grinding wheel, ceramic grinding wheel, CBN grinding wheel, etc. So what kind of grinding wheel should we choose is the most suitable for us?
1.Selection of grinding wheel shape of CNC grinding machine
There are two types of grinding wheels commonly used in CNC grinding machines: cylindrical and cup-shaped grinding wheels. The cylindrical grinding wheel mainly grinds through holes, and the cup-type grinding wheel mainly grinds the outside of the inner hole, and can also grind the end face of the stepped hole.
2.Selection of grinding wheel diameter of CNC grinding machine
In order to achieve the ideal grinding speed in the grinding process of CNC grinding machine, it is generally best to use a grinding wheel close to the aperture, but when the diameter of the grinding wheel increases, the contact arc between the grinding wheel and the workpiece also increases, resulting in increased grinding heat. , making chip evacuation and cooling more difficult. In order to achieve better results, generally the diameter of the grinding wheel and the diameter of the workpiece to be ground have an appropriate ratio, usually between 0.5-0.9.
3.Choice of wheel width
The CNC grinding machine adopts a wider grinding wheel, which is beneficial to reduce the surface roughness value of the workpiece and improve the production efficiency, and can reduce the wear of the grinding wheel. However, the grinding wheel should not be too wide, which will increase the grinding force and cause the bending deformation of the long axis of the grinding wheel. The width of the grinding wheel can be selected according to the length of the workpiece within the allowable range of the rigidity of the grinding wheel connecting the long axis and the power of the machine tool.
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4.Choice of abrasive, particle size, hardness and bond
The selection of the characteristic abrasive, particle size, hardness and bonding agent of the grinding wheel of the CNC internal grinding machine can be selected according to the material and machining accuracy of the workpiece. Generally, the grinding wheel structure used by the CNC internal grinding machine should be 1-2 looser than that of the external grinding wheel.
