Cutting tissue
The cutting piece structure reflects the proportional relationship between the abrasive, the binder and the pores. The denser the cutting piece is, the more the number of abrasive grains is worked, the distance between the cutting edges becomes smaller, and the 6 inch es cutting disc is more likely to be clogged. The dicing sheet containing 45% abrasive was half as much as the average clogging volume containing 49.2% abrasive grains; the dicing sheet containing 53% abrasive was twice as high as the cleavage amount of the cutting piece containing 49.2% abrasive. When cutting difficult-to-machine materials, the cutting piece with the organization number 7 to 9 should be selected, and the cutting piece of the atmospheric hole has a better effect on the air hole cutting piece.
Effect of cutting conditions
♥1 cutting line speed
The increase in the linear speed of the cutting piece reduces the maximum depth of cut of the abrasive grains, reduces the cross-sectional area of ​​the chip, and increases the number of cuttings and the heat of cutting. Both of these factors increase the amount of blockage, but when the line speed of the cutting piece reaches a certain level ( If it is more than 50m/s, the clogging amount of the cutting piece will be greatly reduced. When cutting stainless steel and superalloy in production, the 50m/s cutting speed is 30% to 100% less than the 30m/s cutting piece. Therefore, when cutting a hard-to-grind material, either a speed of less than 20 m/s or a speed of more than 50 m/s is used, and the cutting speed between them is disadvantageous for the clogging of the cutting piece. For each kind of workpiece material, each has a certain critical cutting piece speed value with a small amount of clogging.
42 workpiece speed
The effect of the speed of the workpiece on the degree of clogging of the cutting piece is closely related to other factors in the cutting conditions. The line speed of the workpiece is doubled and the amount of blockage of the cutting piece is increased by three times. This is because the higher the workpiece speed, the shallower the penetration depth of the abrasive grains, and the smaller the cross-sectional area of ​​the chips, which is equivalent to the hardening of the characteristics of the cutting piece, so that the cutting piece is likely to be clogged.
3 cutting method
The cut-in cut is more severe than the longitudinal cut. When cutting into the cutting, the contact area between the cutting piece and the workpiece is large, and the cutting edge of the abrasive grain is rubbed several times on the same wear scar, and the cutting liquid enters the cutting area, and the heat is high during cutting, which is easy to cause blockage. The longitudinal grinding contact with the workpiece material is the side edge of the cutting piece. When the wear surface is increased to a certain extent, the abrasive grains are broken and broken under the action of the cutting force to achieve self-sharpness. Most abrasive particles work in a sharp state, making the cutting force and cutting heat relatively low. At the same time, a considerable portion of the cutting force and the heat affected zone can be discharged out of the workpiece in the direction of the longitudinal grinding, thereby reducing the possibility of chemical adhesion.
4 radial cutting amount
The effect of the radial cutting amount on the blockage of the cutting piece is a hump trend. 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 increases to a certain extent (ap=0.03mm), the clogging amount is increased. It showed a decreasing trend, and then as the amount of cut continued to increase (up to ap=0.04 mm), the amount of clogging increased sharply. Controlling the last radial plunging when cutting difficult materials is critical to improving the surface quality and accuracy of the workpiece.
5 cutting temperature
When cutting, any factor that increases the cutting heat and causes the cutting temperature to rise will aggravate the blockage of the cutting piece. The blockage form is mainly a bond type blockage, and of course, a diffusion type blockage.
6 cutting piece dressing speed
The trimming speed of the cutting piece has a significant influence on the clogging. When the cutting speed of the cutting piece is low, the working surface of the cutting piece is flat, the number of effective grinding tools per unit area is increased, the cross-sectional area of ​​the cutting chip is reduced, and the number of cutting is increased, so that clogging is likely to occur. When the cutting speed of the cutting piece is 髙, the working surface of the cutting piece becomes thick, the number of effective abrasive grains is reduced, and a concave portion appears on the surface of the cutting piece to act as a pore, and the chip is easily washed away, and the sintered material is easily peeled off.
7 cutting fluid
Different cutting fluids have a great influence on the cutting 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. Its specific heat capacity and thermal conductivity are small, which is easy to cause during severe friction. Adhesive wear and diffusive wear between the cutting piece and the workpiece, thehigh quality cutting disc supplier is clogged, the cutting force is increased, and finally the abrasive grains are broken and peeled off prematurely, so that the cutting ratio is lowered. The use of excellent cutting fluids plays an important role in improving cutting performance.
Conclusion
Blocking of the cutting piece is a common phenomenon in the cutting process. No matter how reasonable the processing conditions are, it is impossible to completely prevent the blockage, but the degree is different. The type of cutting piece and the processing conditions have a great influence on the clogging of the cutting piece, but the most important one is the physical and mechanical properties of the material to be processed and the presence or absence of cutting liquid.