Manufacturing technology of diamond medium diameter circular saw blade for stone cutting

Diamond impregnated circular saw blades have the characteristics of high sawing efficiency and good quality of finished products, and have been widely used in stone processing. Stone slab processing requires diamond saw blades in two processes. One is to cut the block into large slabs on a large saw machine, using saw blades with a diameter of more than 900mm, 1000mm, 1200mm or 1600mm or even larger. The second is to use the edge cutting machine to cut the polished slabs according to a certain specification, so that the stone becomes the finished product of the tiles or the expected specification. This stage uses a medium diameter saw blade with a diameter of 300-500mm. These two kinds of saw blades have their own characteristics in terms of processing requirements and cutting principles, so there should be corresponding measures in saw blade manufacturing technology.

For diamond saw blades, the most important properties are sharpness and life. Large saw blades and medium-diameter saw blades have different emphasis on the performance of saw blades due to different processing tasks. For medium diameter saw blades, trimming is the processing procedure in the later stage of stone processing, so the cutting requirements are very high. The main requirements are that the slab does not chip at the corners when cutting the edge, and the cutting line is straight. In addition, the cutting efficiency of the medium-diameter saw blade (the area of the saw blade to cut the stone per unit time) is relatively high, which puts forward very high requirements for the sharpness of the medium-diameter saw blade. The large-size saw blade cutting belongs to the rough processing stage in the stone processing process, and the requirements for edge chipping are not high. In other words, the cost of the diamond segment is more important, and there are higher requirements for the life of the segments. The sharpness is affected by diamond, such as the grade of diamond, the concentration of diamond and the proportion of diamond grit distribution, etc., all of which have a greater impact on the sharpness of diamond saw blades. Of course, ordered diamonds can also improve this very well. Therefore, at present, the best use of diamond cutting ability is the order saw blade. Although it is still in the period of continuous exploration, the existing finished products have a lot of improvement in sharpness and life compared with the traditional ordinary diamond medium diameter saw blades.



The essence of the stone cutting process is the grinding process. During the cutting process of the medium diameter saw blade, due to the narrow width of the diamond segment, the speed of the medium diameter saw blade can be increased, which will have a stronger cutting efficiency, even much higher than that of the large saw blade. For example, comparing a large saw blade with a diameter of D1600mm and a medium diameter saw blade with a diameter of D400mm, the cutting efficiency of the D400mm blade is 26% higher than that of the D1600mm blade. However, due to the higher cutting efficiency of the medium diameter saw blade, it also performs poorly in terms of cutting wear and life. The low wear resistance is very obvious. In addition, the reason why the medium diameter saw blade is not wear-resistant is also based on the following reason: this type of saw blade cutting requires a sufficient tolerant cutting rate.

In the process of cutting stone, the medium-diameter saw blade is in a closed state when the diamond particles pass through the cutting area to cut the stone, and it is impossible to complete the cutting in such a state. Under that condition, it is required that the saw blade has enough scrap tolerant space when cutting, and this scrap tolerant space is provided by the exposure height of the diamond particles relative to the exposure height of the metal bond. If there is not enough scrap tolerant space during sawing, the effective cutting force of the saw blade on the stone will be reduced. The friction and wear of stone and scrap on the diamond abrasive grains and their metal bond increase, the cutting force increases and vibration may occur during the cutting process, resulting in the back and forth swing and beating of the saw blade. In such a case, the working conditions of diamond deteriorate rapidly, which will lead to the decline of the processing quality of the stone, and in severe cases, the stone cannot be cut at all. Therefore, the medium diameter saw blade should be opened diamond before leaving the factory.



The diamond concentration of the segment of the medium diameter saw blade is kept at 20-35% is the best. If the concentration exceeds 35%, the segment will become dull obviously, the efficiency will be reduced, the cutting rate will be reduced, and eventually there is a situation where the slab is cut and broken. If the concentration is lower than 20%, then the segment will have insufficient diamond particles, the cutting efficiency will be seriously reduced, or the segment will be consumed very fast. So the purpose of cutting will not be achieved.

All in all, cutting efficiency is very important for medium diameter saw blades. The sharpness and tolerant cutting rate of the segment are very important parameters. Checking the cutting condition of the segment regularly can keep the segment in a high-efficiency cutting state and can also make the cutting of the saw blade smoother and smoother.