Forging Dimension Accurate-exact Control of Forging Hydraulic Press

doi:10.3901/JME.2021.10.277

Abstract

Abstract: At present, the forging dimension of the hydraulic press is indirectly calculating without considering the factor of frame deformation and so on, which causes the forging dimension is not accurate-exact. A novel compensation algorithm of forging deformation precise control is proposed to address the issues. Firstly, the influence of the deformations of the forging hydraulic press frame on the accuracy of the forging dimension is analyzed, we investigate the effect between the deformations of the forging hydraulic press frame and the accuracy of the forgings dimension, and the elastic-dynamics model of the frame is established using Lagrange Function. Then, through further geometrical analysis, the functional relation of frame deformation, actual forging dimension, and sensor measurement has been derived and the once compensation control has been present. Combined with the pressure change of the forging main cylinder, we investigate the influence of the different main cylinder pressure changes on forging deformation is further obtained. Then, the twice compensation control is introduced into the accurate-exact control. For proving the proposed compensation control methods based on press frame deformation and pressure-change deformation, the comparative experiments of before and after using compensation control algorithm are conducted on 0.6 MN forging hydraulic press to analyze the effect on the forging dimension accuracy. The results of comparative experiments indicate that the proposed twice compensation controller overcome the effect of the forging deformation, and realize the directly the forging dimension control. It improves the forging dimension accuracy, which provides a novel method for forgings dimension accurate-exact control.

Key words: forging hydraulic press, forging dimension, frame deformation, compensation control, control accuracy

CLC Number:

TH137

YAO Jing, WANG Pei, SONG Yingzhe, YANG Shuai, ZHAO Guichun. Forging Dimension Accurate-exact Control of Forging Hydraulic Press[J]. Journal of Mechanical Engineering, 2021, 57(10): 277-285.

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