Grinding control processing quality

In the grinding of different materials and process conditions, the reasonable selection of grinding wheel can reduce the surface precision of grinding and improve the surface quality of grinding, which can double the grinding efficiency, achieve the effect of low cost processing, and the grinding wheel Long service life, low dressing frequency, high metal removal rate, good grinding force and good cooling effect.

Grinding is generally used as the final step in the machining of workpieces. The task is to ensure that the parts of the product meet the precision and surface quality required on the drawings. Grinding surface roughness is closely related to part accuracy, and certain precision should have corresponding surface roughness. Under normal circumstances, the size should be effectively controlled, the roughness Ra should not exceed one-eighth of the dimensional tolerance. The effect of grinding surface roughness on the performance of the part is: the smaller the surface roughness value, the part The better the wear resistance, corrosion resistance and fatigue resistance. The opposite is true.

Therefore, in the grinding process, care must be taken to reduce the surface roughness. The main process factors affecting the surface roughness of the grinding process have a significant influence on the grain size of the grinding wheel. The finer the grain size of the grinding wheel, the more abrasive grains involved in the grinding, the lower the surface roughness of the grinding. Generally, grinding wheels with a size of 46-80 can be used for grinding. Grinding wheels with a size of 150-240 can be used for fine grinding. Resin graphite grinding wheels with W10-W7 grain size should be used for mirror grinding to obtain better surface roughness of the workpiece. .

In recent years, with the development and application of new technologies, the development of high-precision grinding technology has made the grinding size 0.1-0.3μm, the surface roughness is 0.2-0.05μm, the grinding surface metamorphic layer and residual stress are very small, obviously Improved processing quality.

Form grinding, especially high-precision forming grinding, is often a key issue in life. Form grinding has two problems:

First, high performance cutting disc l, mainly the grinding wheel must have good self-sufficiency and shape retention, and the two are often contradictory.

The second is the grinding wheel dressing technology, which is to obtain the required wheel profile and sharpness efficiently and economically. Therefore, in order to improve the efficiency and precision of grinding, especially for the efficient finishing of difficult-to-machine materials, CBN grinding wheels are used for efficient and powerful grinding, which makes the powerful grinding break the limitation of traditional grinding, and the productivity is doubled. It does not need to be roughed and can be directly ground into finished products.

This not only improves the processing efficiency, but also improves the processing quality. Such as SG abrasives. It is a novel ceramic alumina abrasive which uses pure corundum as a raw material and combines it with water and other media such as magnesium oxide to produce a blocky gel which forms a brittle object after drying. Mill it to the desired particle size, from 1300 ° C to 1400 ° C to temperature

Sintered. Its hardness is much higher than ordinary alumina, and its toughness is good, so it can be operated under higher speed and large load conditions, and the metal removal rate is more than three times higher than ordinary alumina. Its biggest advantage is that the grinding zone has a low temperature, the grinding wheel always has a sharp grinding edge, and the grinding wheel has good shape retention and long time. Cubic boron nitride grinding. It is a hard and wear-resistant abrasive with excellent properties such as high thermal conductivity and chemical resistance. The latest generation of abrasives are characterized by sharp, high strength and can be used for unsupported cutting. These features reduce the grinding forces during grinding and reduce damage to the workpiece.