Analysis on the service life of diamond saw blade

- Dec 20, 2019-

Analysis on the service life of diamond saw blade


Diamond saw blade is an indispensable tool for stone mining and processing. There are many factors that determine its efficiency and service life. Generally speaking, it mainly includes the following parameters.


Diamond saw blade is an indispensable tool for stone mining and processing. There are many factors that determine its efficiency and service life. Generally speaking, it mainly includes the following parameters.


I. sawing parameters


(1) saw blade linear speed: in actual work, the linear speed of diamond circular saw blade is limited by the equipment conditions, saw blade quality and the nature of the stone to be cut. In terms of the best service life and cutting efficiency of the saw blade, the linear speed of the saw blade should be selected according to the nature of different stones. When sawing granite, the linear speed of saw blade can be selected in the range of 25m-35m / s. For granite with high quartz content and difficult to cut, the lower limit of the linear speed of saw blade is appropriate. In the production of granite tiles, the diameter of diamond circular saw blade is small, and the linear speed can reach 35m / s.


(2) sawing depth: the sawing depth is an important parameter related to diamond wear, effective sawing, stress on the saw blade and the nature of the stone to be sawed. Generally speaking, when the linear speed of the diamond saw blade is high, a small cutting depth should be selected. From the current technology, the depth of cutting diamond can be selected between 1mm and 10 mm. Generally, when a large diameter saw blade is used to cut granite, the cutting depth can be controlled between 1mm and 2mm, and at the same time, the cutting speed should be reduced. When the linear velocity of diamond circular saw blade is large, a large cutting depth should be selected. However, when the performance of the saw and the strength of the cutting tool are within the allowable range, the cutting concentration should be as large as possible to improve the cutting efficiency. When the machining surface is required, small depth cutting shall be adopted.


(3) feed speed: the feed speed is the feed speed of the stone being sawed. Its size affects the sawing rate, the force on the saw blade and the heat dissipation in the sawing area. Its value should be selected according to the nature of the stone to be sawed. Generally speaking, the cutting speed of soft stone, such as marble, can be increased properly. If the cutting speed is too low, it is more conducive to improve the cutting rate. If the cutting speed is too low, the diamond edge is easy to be polished. However, when sawing the granite with coarse grain structure and uneven hardness, the cutting speed should be reduced, otherwise the vibration of the saw blade will lead to diamond fragmentation and reduce the cutting rate. The cutting speed of sawing granite is generally selected in the range of 9m-12m / min.


II. Other influencing factors


(1) diamond granularity: the commonly used diamond granularity is in the range of 30 / 35-60 / 80. The harder the rock is, the finer the grain size should be selected. Because under the same pressure, the finer and sharper the diamond is, the better it is to cut into the hard rock. In addition, generally large-diameter saw blade requires high sawing efficiency, so it is better to select coarse grain size, such as 30 / 40, 40 / 50; small-diameter saw blade has low sawing efficiency, and requires smooth rock sawing section, so it is better to select fine grain size, such as 50 / 60, 60 / 80.


(2) cutter head concentration: the so-called diamond concentration refers to the density of diamond distributed in the working layer matrix (that is, the weight of diamond contained in unit area). According to the specification, the concentration of 4.4 carat diamond per cubic centimeter of working matrix is 100%, and that of 3.3 carat diamond is 75%. The volume concentration represents the volume of diamond in the agglomerate, and it is specified that the concentration is 100% when the volume of diamond accounts for 1 / 4 of the total volume. Increasing diamond concentration can prolong the life of saw blade, because increasing diamond concentration can reduce the average cutting force of each diamond. However, increasing the depth will inevitably increase the cost of the saw blade, so there is a most economical concentration, and the concentration increases with the increase of the cutting rate.


(3) hardness of the cutter head binder: Generally speaking, the higher the hardness of the binder, the stronger its wear resistance. Therefore, when sawing the rocks with high abrasiveness, the hardness of the bond should be high; when sawing the soft rocks, the hardness of the bond should be low; when sawing the rocks with high abrasiveness and hard, the hardness of the bond should be moderate.


(4) force effect, temperature effect and grinding damage: in the process of cutting stone, diamond saw blade will be affected by centrifugal force, sawing force, sawing heat and other alternating loads.


Due to the effect of force and temperature, the diamond circular saw blade is damaged.