Abstract
Regarding straightening unit as the research object, considered the different of roller spacing, a mathematical model of intermesh schedule suitable to the 2800 seven-roller strong heavy plate straightening machine was deduced by the geometric method. According to the mathematical model, the intermesh schedules of several specifications of plate were calculated, and the finite element model of straightening process was established in the finite element analysis software Abaqus. By analysing, it was found that those plates after straightening cannot meet the requirement of flatness, due to the existence of the work hardening. The bending deflection of the last straightening unit was modified and the new calculation formula of intermesh schedule was obtained. The values of the modified coefficients were determined by the finite element method. The intermesh schedules of other specifications of plate were calculated by the modified calculation formula and then verified it in Abaqus. The simulation results showed that those plates after straightening meet the requirement of flatness. So, the research results provide a theoretical basis for development of a new plate straightening machine and formulation of intermesh schedule.
Highlights
At present, the straightening intermesh schedule of strip and medium thin plate is studied more [1], but the heavy plate more than 50mm is usually straightened by the less efficient pressure straightening machine
In order to improve the speed of formulating intermesh schedule and the straightening work efficiency, for the 2800 seven-roller strong heavy plate straightening machine designed by Yanshan University, a mathematical model of intermesh schedule is deduced
In order to verify whether the straightening quality of the calculation formula of intermesh schedule after modifing is improved, the straightening intermesh schedules of plates of 400 MPa/40 mm,[400] MPa/60 mm and 600 MPa/50 mm specifications are calculated by the modified formula, the finite element models are established and simulated
Summary
At present , the straightening intermesh schedule of strip and medium thin plate is studied more [1], but the heavy plate more than 50mm is usually straightened by the less efficient pressure straightening machine. The algorithm of intermesh schedule for some thick plate roller straightening machine ignore the different of roller spacing, and it is inaccuracy. In order to improve the speed of formulating intermesh schedule and the straightening work efficiency , for the 2800 seven-roller strong heavy plate straightening machine designed by Yanshan University, a mathematical model of intermesh schedule is deduced. 2.1 Brief Introduction of 2800 Seven-Roller Strong Heavy Plate Straightening Machine. Work roller diameter Dw=480 mm, back roller diameter Db=500 mm, roller spacing of under edge guide rollers t1=600 mm, roller spacing of middle rollers t2=520 mm; the maximum total straightening force P=30000 kN, the maximum straightening power N=1000 kW; straightening range: the thickness is 30-75 mm,the maximum width is 2650 mm,the maximum yield strength is 700 MPa
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