| IHI flying shear is an important equipment on the hot rolling plate line. With the product’sdiversification demand from market, the capacity of flying shear should be improved to meet theproduction requirements. In order to explore the maximum shear capacity of the IHI flying shear,the finite element method software is used to simulate the shearing process of the IHI flyingshear, by which to make the related theoretical analysis has been made. Main points in this paperinclude:(1) Based on the elastic-plastic dynamics theory and material fracture mechanics theory,combined with plate shearing process, the process of material shear stress and strain equationand material fracture equation have been described, the flying shear cutting model under thedynamic contact have been established.(2) Analyzing the changes of stresses and strains with time in the shearing process,researching the maximum shear forces depending on the friction coefficient, shear blade gap，thickness and velocity. These impact effects must be taken into account in the calculation of themaximum shearing forces. Compared with the modified B.B.Nosalia formula, the simulationresults are feasible, that means the model can be used to simulate the actual production.(3)Using Lagrangian finite element method to analyze the changes of stresses in the slaband the tip contact areas, and simulate the processes of fracture cracks initiation, expansion andfracture formation, and analyze the impact of the shear velocity and blade gap on the sectionquality.(4) Analyzing force ansysis of the shear blade model. The paper mainly analyzes the stresschanges of the critical areas of shear blade, and researches the distribution of shear stresses andstrains in the whole process. |
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