折弯机液压补偿装置对工作台挠度曲线的影响分析与优化

Analysis and Optimization of Bending Machine Hydraulic Compensation Device's Influence on the Workbench Deflection Curve

折弯机的加工精度是最重要的性能指标之一。运用弹性力学理论对工作台变形进行分析,折弯时滑块与工作台共同受到板材的反作用力,必然会产生明显的挤压变形,从而导致上、下模发生相同的挠曲变形,严重降低了工件的折弯角度及直线度。以某型数控折弯机为研究对象,为了提高加工精度,利用液压原理对工作台挠度进行压力补偿,运用有限元分析与实验测试相结合的方式,多变量建模并仿真,研究了折弯机在满载自由折弯工况下的补偿效果,并确定了最佳的优化方案,运用有限元理论解决了实际生产问题。

The machining accuracy of bending machine is one of the most important performance indicators. The deformation of working table was analyzed by using the elasticity theory. On bending,the reaction force affected the slider and the worktable. It was bound to produce obvious extrusion deformation,which could lead the upper and lower dies to have the same bending deformation,severely affecting the work-piece bending angle and straightness. Taking a bending machine as the research object,in order to improve the machining accuracy,the hydraulic principle was used to have a pressure compensation for the deflection of the working table. Using the finite element analysis and experimental testing,multivariate modeling and simulation were completed,the compensation effect of the bending machine in the full load free bending condition was studied,and the best optimization scheme was determined. So the finite element theory is used to solve practical problems in production.