Wear and fracture behavior of cemented carbide column nails for high-pressure roller mills
The good or bad performance of cemented carbide column nail directly affects the service life and productivity of high-pressure roller mill,but there is a lack of research on the inter-correspondence between the mechanical properties of the column top and the performance in use,which leads to the lack of cemented carbide design standards in the process of use.In this paper,the ideal column nail for crushing high hard quartzite was obtained by studying the influence law of performance characteristics such as hardness,bending strength and fracture toughness of column nail on the wear resistance and fracture resistance of column top.The results show that the main factor affecting the fracture number of column nail is fracture toughness rather than bending strength,and as the fracture toughness increases from 16.21 MPa∙m1/2 to 21.57 MPa∙m1/2,the resistance to fatigue fracture improves,and the fractures number percentage decreases from 3.77%to 0.The wear of the column nail is mainly abrasive grain wear,and as the hardness increases from HRA 86.2 to HRA 88.3,the wear resistance improves and the wear rate decreases from 7.92 μm/h to 2.33 μm/h.For the ore crushing with quartz content as high as 64.23%and uniaxial compressive strength of 159 MPa,the wear and fracture of the column nail could be effectively suppressed when the hardness of the column nail reaches HRA 87.8 and the fracture toughness reaches 19.55 MPa∙m1/2.
万方数据
维普
