Aiming at the 1∶30 model of a die forging hydraulic press, the contact surfaces between clamping beam and C-plates were simplified to the contour lines in plane finite element model, thus the optimization of contact surface was changed into the optimization of the contour lines. The parameters of the curves, including cubic spline curve, arc curve and B spline curve were taken as the target curves, and they were optimized with the sequential quadratic programming method in finite element models. According to the optimization results, clamping beams with different contact surfaces were made and applied on the metal model, which was manufactured at a ratio of 1∶30 based on a die forging hydraulic press. The stress conditions under the preload load-case were tested. The average absolute error, compared with the simulations, in the experiments is 9.87MPa, and the average relative error is 18.1%. The simulation results and experimental results based on the optimization results indicate that, under preload load-case, the optimized clamping beams can decrease the local high stress on contact surfaces in different degrees.
