The strength,rigidity and own mode of the frame for T30 CNC turret punch press have been calculated and analyzed through finite element method.On the basis of analysis results,the structure design of frame on the CNC turret punch has been optimized.The optimized frame has saved about 20% steel consumption.The manufacturing cost has been effectively decreased,which provides reference for the reasonable design of the turret punch press.

By use of the three-dimensional elastic contact finite element method,the numerical simulation has been adopted for the compensation process of the compensation device of press brake,and the load-deflection distortion curve of the upper surface of workbench has been obtained. By comparing with the deformation curve of the lower surface on slider,the design parameters of the machine compensation device has been revised. The curve coincidence of workbench and slider has been highly improved and the manufacturing accuracy of the press brake has been increased,which provides guidance for the design of machine compensation commendably.

Throat is a weak link in the design of press brake due to the concentration of stress.On the basis of the new developed MB8-250×3200 CNC press brake project of author's company,the frame has been optimized by use of FEM.The optimized frame can effectively reduce the stress concentration in the throat,which saves material and enhances the economical benefit.

The three-dimensional elastic contact finite element method has been used to numerically simulate the compensation process of the compensation device in press brake in the text.The deformation rule of the compensation device has been obtained.The results show that the compensation device has a good effect on the machining process of press brake, which offers a theoretical basis for the design and operation of the compensation device. In addition, the accuracy of contact analysis has been verified by comparing with the results of geometrical computation.