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Abstract：
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The existing mathematical model of rolling process for four-roller bending machine usually does not consider the influence of curvature center offset for plate on the position of lower roller during asymmetric roll bending. Therefore, on the basis of considering the springback of plate in the roll bending process of bending machine, combined with the analysis of mathematics and mechanics, the precise displacement of lower roller was determined after the plate curvature center was shifted, the relationship between the bending moment and force of plate and the displacements of side and lower rollers was established, and a calculation method of roller displacement for four-roller bending machine was proposed. Furthermore, the geometric relationship between residual straight edge and position angle of lower roller φb was determined by bending moment and pressure, the calculation error caused by the empirical value of residual straight edge was avoided, and the calculated residual straight edge was in line with the actual production experience. The experiment results indicate that the relative displacement error of side roller calculated by the traditional theory is 2.2%-2.4%, the error calculated by the improved method is 1.3%, and the calculated residual straight edge is about 1.5 times the plate thickness, which is consistent with the estimated residual straight edge in the traditional theory with 1-2 times the plate thickness. Thus, the experimental results prove the effectiveness of the improved calculation method, and the new method shows that the same forming radius can be obtained by the combination of different roller displacements and lower roller pressures during the roll bending process.
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Funds：
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AuthorIntro：
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汪兴（1995-），男，硕士研究生，E-mail：wangxinghust@qq.com；作者简介：陈柏金（1965-），男，博士，教授，E-mail：chenbaijin@sina.com
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Reference：
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