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What are the reasons for the blockage of the cutting piece?

The tissue cutting piece of the cutting piece reflects the proportional relationship between the abrasive, the binder and the pores. The denser the tissue, the smaller the ratio of the pores, the smaller the distance between the cutting edges, and the aluminum abrasive cutting disc is more likely to be clogged. The dicing sheet containing 53% abrasive grains was twice as high as the average clogging amount of 49.2% abrasive grains, and the dicing sheet containing 45% abrasive grains was less than half the average clogging amount of 49.2% abrasive grains. When grinding difficult-to-machine materials, the cutting piece with the organization number 7-8 should be selected.

The influence of grinding conditions on the cutting speed of the cutting line speed is more complicated. When the cutting piece is increased from 28.8m/s to 33.6m/s, the speed is only increased by 16%, and the blocking amount is increased by three times. Since the increase in the linear velocity of the cutting piece reduces the maximum depth of cut of the abrasive grains, the cutting cross-sectional area decreases, and the number of cuttings and the heat of grinding increase, so that the amount of clogging increases. However, when the line speed of the high quality cutting disc supplier is high to a certain extent (for example, up to 50 m/s or more), the amount of clogging of the cutting piece is greatly reduced. Therefore, it is preferable to select the speed of the cutting piece during the grinding process to avoid the speed of 20 m/s to 50 m/s.

Workpiece speed experiments show that the working speed is doubled and the amount of clogging of the cutting piece is increased by three times. Because the higher the workpiece speed, the larger the abrasive load, the shallower the *********** depth of the abrasive grains, and the smaller the cross-sectional area of ​​the chips. When the grinding thickness is increased, the passivation of the abrasive grains is increased, and the grinding of the workpiece by the cutting piece is increased. The pressure is equivalent to the hardening of the characteristics of the cutting piece, which increases the clogging of the cutting piece. Grinding method In the grinding method, any grinding that increases the contact area between the cutting piece and the workpiece will aggravate the blockage of the cutting piece. This is because the contact area between the cutting piece and the workpiece is large, and the abrasive cutting edge will be scratched multiple times on the same wear mark, so that the grinding layer strengthening on the workpiece is intensified, and the coolant is difficult to enter the grinding zone, and the grinding heat is high and the temperature is high. High, creating conditions for clogging, prone to chemical sticking and embedding plugging. If the end grinding is easier to block than the circumferential grinding, the transverse cutting grinding is more serious than the longitudinal grinding. Radial cut-in radial cutting amount has a ****-like effect on the blockage of the cutting piece. When the radial cutting amount is small, (ap<0.01mm), the clogging phenomenon occurs. As the amount of cutting increases, the average clogging amount also increases. When the cutting amount is large to a certain extent (ap=0.03mm), the clogging amount is again The trend is reduced, and then as the amount of cut continues to increase (up to ap=0.04 mm), the amount of clogging rises sharply.
Different grinding fluids of grinding fluid have a great influence on the grinding effect. At present, the common emulsion contains a large amount of mineral oil and oily additives. After dilution, it is an oil-in-water emulsion white liquid, which has a small specific heat capacity and thermal conductivity, and is in a severe friction process. It is easy to cause adhesive wear and diffusion wear between the China cutting disc for metal and the workpiece, which causes the cutting piece to be clogged, the grinding force to increase, and finally causes the abrasive to break and fall off prematurely, so that the grinding ratio is lowered. Therefore, the selection of an excellent grinding fluid plays an important role in improving the grinding performance.


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