Cutting coal and rock mining machinery knives, such as "flat cutter tooth (flat pick)", "conical cutter tooth (conical pick)" "Radial cutting teeth (radial pick)", "reduce to reduce teeth (tangential pick)", and so on.
The put on mechanism of the literature or nature as mechanical put on with thermal fatigue put on and abrasive put on. It is not difficult to see, is fairly harsh choose the overall performance specifications of surfacing welding layer, the initial itself to put on, that is to say, in the procedure of coal mining, cutting teeth welding layer in between the coal seam and continuing friction movement occurs, choose the surfacing layer should withstand seam lengthy put on. In this case, the surfacing layer hardness, put on resistance, the greater the much better Second, cutting teeth should be regarded as in the procedure of cutting coal and rock inevitable influence loading, if the hardness of surfacing layer is as well higher, metal toughness is poorer, surfacing welding layer metal are prone to cracking or fracture. Consequently, the greater the hardness of surfacing layer is not necessarily much better, but ought to be complete consideration, make its have great anti-put on overall performance. Anti-put on overall performance, refers to the higher put on-resisting overall performance premise circumstances, suitable to decrease the hardness and put on resistance, with its moderate put on resistance enhanced complete harm resistance hardfacing layer. The very best complete harm resistance and hardness of surfacing welding layer, there is a matching partnership in between the partnership of quantitative figure out, welding layer for cutting teeth welding material properties of the significant improvements have a good function.
Choose the use of surfacing welding layer overall performance influence aspect is much more, on the entire there are 3 primary elements: 1 is the influence of load force.
In the procedure of coal mining, which improve the impact of get in touch with force in between coal and rock in the surfacing layer and elements, such as growing the shearer traction speed, cutting resistance of improve, cutter tooth put on phenomenon will improve
Second, the influence of geometric parameters and arrangement of. Affordable cutting gear geometry parameters and a great match with the coal rock physical properties of cutter tooth arrangement, can decrease the cutting tooth cutting resistance and axial force, so as to slow the abrasion of cutting teeth
three it is surfacing layer and the influence of coal rock material properties. Coal difficult of quantity and soft and the extremely of waste rock, apparent put on effects on cutting tooth much less. Coal little soft, little waste rock of coal rock, cutter tooth cutting resistance is put on, shearer traction resistance is price, the smaller sized put on of price On the other hand, the bigger overall performance of elements.
In the surfacing layer initial influence elements above, the elements and the second is that external trigger, the third point is the internal function, external each by internal ultimately. That is to say, aspect the influence of load force and the influence of geometric parameters and arrangement of, Right here to reflect to the surfacing layer and the influence of material properties on coal. Material properties is the core had been. chosen, the coal and rock material properties traits current in advance (i.e., by coal rock alter is the pick objective), can choose the material properties is alter surfacing layer. And evaluation the type of the surfacing layer properties, in the final total depends on the material composition, microstructure and properties of surfacing, and strict implementation of technologies a important set of welding components.
In the utilizing position of cemented carbide business, sorts six star carbide various production of two extremely of great shape of alloy tooth, has the influence put on significantly resistance and enhancing resistance, item price the service life of the consumer.
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