Cutting coal and rock mining machinery knives, including "flat cutter tooth (flat pick)", "conical cutter tooth (conical pick)"; "Radial cutting teeth (radial pick)", "cut to cut teeth (tangential pick)", etc.
The wear mechanism of the literature or nature as mechanical wear with thermal fatigue wear and abrasive wear. It is not hard to see, is quite harsh pick the performance requirements of surfacing welding layer, the first itself to wear, that is to say, in the process of coal mining, cutting teeth welding layer between the coal seam and continuing friction movement happens, pick the surfacing layer must withstand seam long wear. In this case, the surfacing layer hardness, wear resistance, the higher the better; Second, cutting teeth must be considered in the process of cutting coal and rock inevitable impact loading, if the hardness of surfacing layer is too high, metal toughness is poorer, surfacing welding layer metal are prone to cracking or fracture. Therefore, the higher the hardness of surfacing layer is not necessarily better, but should be comprehensive consideration, make its have good anti-wear performance. Anti-wear performance, refers to the high wear-resisting performance premise conditions, appropriate to reduce the hardness and wear resistance, with its moderate wear resistance improved comprehensive damage resistance hardfacing layer. The best comprehensive damage resistance and hardness of surfacing welding layer, there is a matching relationship between the relationship of quantitative determine, welding layer for cutting teeth welding material properties of the major improvements have a positive role.
Pick the use of surfacing welding layer performance influence factor is more, on the whole there are three main factors: one is the influence of load force.
In the process of coal mining, which increase the effect of contact force between coal and rock in the surfacing layer and factors, such as increasing the shearer traction speed, cutting resistance of increase, cutter tooth wear phenomenon will increase;
Second, the influence of geometric parameters and arrangement of. Reasonable cutting gear geometry parameters and a good match with the coal rock physical properties of cutter tooth arrangement, can reduce the cutting tooth cutting resistance and axial force, so as to slow the abrasion of cutting teeth;
3 it is surfacing layer and the influence of coal rock material properties. Coal quality of hard and soft and the amount of waste rock, very obvious effects on cutting tooth wear. Coal quality soft, less waste rock of coal rock, cutter tooth cutting resistance is small, shearer traction resistance is small, the wear rate of smaller; On the other hand, the wear rate of larger.
In the surfacing layer performance influence factors above, the first and the second is that external factors, the third point is the internal factors, external cause by internal work. That is to say, both the influence of load force and the influence of geometric parameters and arrangement of, eventually to reflect to the surfacing layer and the influence of material properties on coal. Material properties is the core factor. Here, the coal and rock material properties were selected in advance (i.e., by coal rock characteristics is the existing objective), can change the material properties is pick surfacing layer. And pick the change of the surfacing layer properties, in the final analysis depends on the material composition, microstructure and properties of surfacing, and strict implementation of form a complete set of welding technology.
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