| The shearing machine is a common product in metallurgical industry. With the continuous development of the market demand, the working performance of the shearing machine is becoming stricter and stricter. And due to the market competition, higher shearing quality and rate, longer service life and some other performance are also required in the design cycle of the shearing machine.With the development of the computer technology and computational mechanics, especially the development of the finite element analysis theory (FEA), the design and research of shearing machine by using modern design method is becoming an appropriate way. As a research object, the hydraulic pendulum shearing machine is studied in this paper, in order to solve the problem why does the poor quality come out during the shearing processing. And in a further research, the solution focusing on compensation of shearing gap and dynamic response problem will be figured out. The main researches are as follows:1、Based on the displacement and stress testing principle and method, a displacement test on the shearing blades and a dynamic stress test on the rack throat had been conducted with the appropriate experimental method and devices. And the displacement distributions of the main components of shearing machine and stress distributions in the frame throat had been mastered in the shearing processing.2、The applicability analysis of Nosalia empirical formula and the correction of the calculating of pendulum shearing machine were analyzed in this paper, in order to make the formula meet the needs more. And an experimental testing on the shear force was conducted as well as the FEA theory on the shearing processing, to verify the feasibility of the FEA theory to solve the problem. And the maximum shearing force was also obtained by the analysis of shearing processing model, building by the FEA techniques, to lay the foundation for the further static analysis and compensation for shearing gap of pendulum shearing.3、The finite element model of Pendulum shearing machine were established by using the finite element analysis software ANSYS Workbench,and the testing process of pendulum shearing machine were numerically simulated, getting the displacement and the static stress distribution of the measuring point. Combined with the result of experimental testing, the feasibility of the FEA method to solve the problem was verified.4、After Analyzing the shearing clearance compensation effect, by taking the parameter of blade displacement, the objective function was worked out. And the parameters of tool box and the work table were taken as design variables. And the structural optimization was finished by the limit of overall stress. It was found that, to some extent, the optimization has reached the compensation effect. 5、The dynamic response of Pendulum shearing machine was analyzed by using transient dynamic analysis method. And two different transient dynamic performance were analyzed under two kinds of dynamic loads-sudden load and moved load. In these two working conditions, deformed displacement values on crucial nodes of Pendulum shearing machine were calculated, and the corresponding nodal deformed displacement graphs were plotted, and the dynamically compensation effect of shearing gap was certificated. And at last, come to the conclusion that the maximum stress of the frame throat can meet strength requirements under dynamic load. |
PDF Full Text Request