Factors affecting the life of diamond abrasive tools

First, sawing parameters

(1) Saw blade line speed: In actual work, the linear speed of the diamond abrasive tools is limited by equipment conditions, saw blade quality and sawing properties. Starting from the optimum saw blade life and sawing efficiency, the linear speed of the saw blade should be selected according to the nature of the different stones. When sawing granite, the linear speed of the saw blade can be selected from 25m to 35m / s. For granites with high quartz content and difficult to saw, the lower limit of the blade line speed is suitable. In the production of granite tiles, the diamond abrasive powder are used with smaller diameters and line speeds of up to 35 m / s.

(2) Sawing depth: The sawing depth is an important parameter related to diamond wear, effective sawing, saw blade force and the nature of the sawed stone. In general, when the linear speed of the diamond abrasive tools is high, a smaller depth of cut should be selected. According to current technology, the depth of diamond abrasive tools can be selected from 1 mm to 10 mm. When cutting a granite block with a large-diameter saw blade, the sawing depth can be controlled between 1mm and 2mm, and the feed rate should be reduced. When the linear speed of the diamond abrasive tools is large, a larger cutting depth should be selected. However, when the performance of the saw and the tool strength are within the allowable range, the cutting concentration should be used as much as possible to improve the cutting efficiency.

(3) Feed rate: The feed rate is the feed rate of the saw stone. Its size affects the sawing rate, the force on the saw blade, and the heat dissipation in the sawing area. The value should be chosen according to the nature of the stone being sawed. In general, sawing softer stones (such as marble) can increase the feed rate appropriately. If the feed rate is too low, it is more conducive to improve the sawing speed. Fine-grained, relatively uniform granite sawing can properly increase the feed rate. If the feed rate is too low, the diamond abrasive tools is easily flattened. However, when cutting granite with a coarse grain structure and uneven hardness, the feed rate should be reduced, otherwise the vibration of the diamond abrasive tools will cause the diamond to break and reduce the sawing rate.

2 diamond abrasive (001)

Second, other influencing factors

(1) Diamond particle size: The commonly used diamond particle size is in the range of 30/35 to 60/80. The harder the rock, the finer the grain size should be chosen. Because the diamond is finer and sharper under the same pressure conditions, it is very useful for cutting hard rock. In addition, generally large diameter saw blades require higher sawing efficiency and should have a coarser grain size, such as 30 / 40, 40 / 50; otherwise, a smaller particle size should be chosen. The sawing efficiency of small-diameter saw blades is low, and the rock sawing sections are required to be smooth, which is suitable for selecting finer particle sizes such as 50 / 60, 60 / 80.

(2) Tool head concentration: The so-called diamond concentration refers to the density of the diamond distributed in the working layer carcass (ie the weight of the diamond contained in the unit area). The Code states that the concentration of 4.4 carats of diamonds per cubic centimeter of working car is 100%, while the concentration of 3.3 carats of diamonds is 75%. The volume concentration indicates the volume of diamond in the agglomerate, and specifies that when diamond accounts for 1/4 of the total volume, the concentration of diamond is 100%. An increase in diamond concentration is expected to extend the life of the saw blade because increasing the diamond concentration reduces the average cutting force per diamond. However, increasing the depth will inevitably increase the cost of the saw blade and is therefore the most economical.

(3) Hardness of drill bit bonding: Generally, the higher the hardness of the bond, the stronger the wear resistance. Therefore, when sawing high-erosion rock, the hardness of the adhesive should be high; when sawing soft rock, the hardness of the adhesive should be low; when sawing hard rock, the hardness of the adhesive should be moderate . .

(4) Force effect, temperature effect and wear: diamond abrasive tools will withstand alternating loads during cutting of stone, such as centrifugal force, sawing force and sawing heat. The wear of the diamond abrasive tools is caused by force and temperature effects.

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