The Mechanical Analysis Of The Failure Of The Bolt In The Feed Roller Of BD1 Mill Under The Strong Impact Loading And Optimization

Steel rolling production workshop, used to transport the vertical conveying roller called roller rolling. Rolling the roller the blank is sent to shear or sent to the mill, and in the line of the various operations are widely used. In large BD1 billet machine, roller general is very close to the roller, because when the workpiece into the roller of a rolling mill is more reliable and safe. Due to the burning process in the furnace and other factors, the front end of the bending occurs in varying degrees. When the front end of the workpiece upward bending of the time, generally will not impact roller, but when the workpiece is bent downward, will shock of the roller, both ends of the fixed frame and bearing seat bolt fracture cycles to failure is far less than the expected design. At the same time, rolling in BD1 mill points multiple pass rolling, so that the front and rear of the frame and in a strong impact of the harsh working environment. The working personnel of a rail beam plant can improve the fracture failure of the bolt by turning the roller and the larger the nominal diameter, but the effect is not very obvious. The frame and the rail beam rolling mill production line as the research object. Analysis rack and the fracture failure of the bolts of the factors, and reasonable optimization of the frame and, effectively buffering piece of impact force. At the same time, when the bolt breaks, it can realize the rapid replacement and reduce the time of interruption.The main contents of this paper are as follows: in order to study the reason of bolt fracture and its effective improvement:1.Establish the geometric model of the roll of the rack, and the appropriate modification of the model, ignoring some of the characteristics of the impact of the calculation results, the simplified model.2.The model is introduced into the finite element analysis software, and the model is introduced into the finite element analysis software by using the good interface between the 3D software and the finite element analysis software.3.Through the analysis of the impact of the results of the analysis of the equivalent effect of cloud image and other ways to find the process of collision in the stress concentration of the part, and the yield limit of the material to check. As a reference, and should be optimized after the comparison work, identification of the effect of optimization.4.Calculation of bolts in the workpiece impact force. Analysis under various conditions of rolling collision impact force on the life of the bolt. Find out the reason of affecting the bolt life, and optimize the structure of the frame to improve the actual life of the bolt.The research results show: rolled on the roller collision forces cannot get effective buffer is lead to the main cause of the fracture failure of the bolts. The impact of the calculation and analysis indicate that, by adding a damping gasket can be obviously buffer strip, extend equipment life. In addition, reduce the workpiece bite speed also can prolong the equipment life, but this way reduces the production efficiency of enterprises.