Based On The Joint Simulation Under The Straightening Machine Of Hydraulic Pressure Servo System Dynamic Characteristic Research

Straightening is the last process for shape control in the plate production. It isimportant for the plate quality. With the productions quality requirementsenhancing, the leveler performance is put forward higher requirements. The fullhydraulic leveler is replacing the mechanical press leveler with its advantages:strong straightening force, high precision control, fast response, taking rollbending structure, better flatness control effect and improving the automation ofthe production process. The third-generation leveler used in my country isdesigned by foreign companies, for example SMS and so on. However, the coretechnology is blockaded for us. The home-made full hydraulic leveler breaksthrough the abroad technology blockade by Taiyuan University of Science andTechnology and Taiyuan Heavy Machinery Group Co., Ltd. The hydraulic servosystem has been used in the full hydraulic leveler and the equipment has beenused widely.This paper takes the hydraulic servo system of full hydraulic leveler as theresearch object. After studying the operating feature, it built a new simulationmodel which may get smaller error by comparing with the experiment data. Thenew simulation model will provide a good simulation platform to shortendevelopment time and optimize the device parameters.During the leveling process, the leveling force is different due to effect ofvarious defects, so the four servo cylinder may take various loads. The servosystem of the leveler is a nonlinear complex system with the features: variableload, large flow and big load because of the nonlinear characteristic of thehydraulic system. According to the complex status, it may not reflect the statusof the equipment accurately that the traditional model uses only one simulatesoftware. The traditional model takes the data is more different than the actualdata, so it can not guide the equipment research and optimizing.In this paper, in order to effectively simulate the variable load case, a newmodel development method was introduced into the simulation model. Threesimulation models including Simulink, AMESim, and combined AMESim andSimulink were employed in the simulations. The results reveal that the different simulation models possess different dynamic characteristic. The minimum errorappears in the combined AMESim and Simulink, and it is average error is9.4%.This demonstrates that the combined simulation model is applicable in levelingprocess.