The effect of the cutting wheel itself on the blockage
1 abrasive variety The degree of clogging of different grinding wheels varies greatly. From the point of view of reducing the degree of blockage and improving the grinding effect, different abrasive materials should be used for different workpiece data. If the selected abrasive does not meet the grinding performance of the workpiece data, it is likely to cause severe blockage and thus cannot be processed normally. If the iron-carbon alloy is ground with corundum abrasive, carbon forms a thin oxide film in air and oxygen, which prevents chemical affinity between the workpiece and the abrasive, but if the titanium alloy is ground, the blockage is more serious. Some grinding wheels on factory grinders cannot be used for a long time, and in practice, efficiency and precision are lost. China supply 7" cut off disc
2 abrasive grain size The size of the abrasive particles has an effect on the cutting wheel. Generally, China supply 7" cut off disc the fine particle size is more likely to cause infarction than the coarse particle size. Due to the small pore volume and cross-sectional area of the fine-hole grinding wheel, the number of cutting edges of the fine-grain grinding wheel increases, the number of chips increases, and the grinding temperature also increases. In the range where the number of cutting times is small, the fine grinding wheel is easy. Infarction. As the number of trimming increases, the coarse grinding wheel has a larger depth of cut than the fine grinding wheel, the abrasive cutting edge wears a large amount, the grinding temperature increases, and the chip melts in the pores. After a certain number of times, the infarct amount of the coarse grinding wheel exceeds the infarct amount of the fine grinding wheel. When semi-finishing and fine grinding, the cutting amount is small, the temperature is low, the infarction is light, and the fine grinding wheel is selected; the rough grinding has a large cutting amount, the temperature is high, the indentation is in the gap, the grinding debris and the sintered material are many, and the coarse grinding wheel is selected.
3. The hardness of the grinding wheel The hardness of the grinding wheel refers to the level of difficulty of the abrasive particles, which is ensured by the strength of the adhesive. The higher the strength of the adhesive, the greater the hardness of the grinding wheel, the more blunt the abrasive particles, the more severe the sliding and extrusion of the workpiece before the abrasive particles fall, and the grinding debris is more easily mechanically filled into the gap of the grinding wheel. At the same time, it also produces more frictional heat to provide sintering for the infarct. Therefore, the hardness of the grinding wheel has a greater influence on the amount of infarction, and the harder the grinding wheel, the larger the infarct amount. Under normal conditions, the hardness of the grinding wheel is G-H. In some difficult materials, the hardness of D-o is also used.
4 grinding wheel organization The grinding wheel structure reflects the proportional relationship between the abrasive, the binder and the pores. The denser the grinding wheel, the greater the number of abrasive grains, the smaller the spacing between the cutting edges, and the more difficult the infarction of the grinding wheel. The grinding wheel with 45% abrasive is half of the uniform impregnation with 49.2% abrasive particles; the grinding wheel with 53% abrasive is twice the size of the embedded grinding workpiece, and the grinding wheel contains 49.2% abrasive. When grinding difficult materials, the grinding wheels with the number 7 to 9 should be selected. The atmospheric hole grinding wheel has a good effect on the atmospheric hole grinding wheel.
