Simulation analysis of the shear quality under two return methods of high-speed punch press

WANG Jing; HAN Heyong; PAN Siyi; WU Li; HOU Yue; LIU Chuiyi; WANG Haobo

doi:10.3969/j.issn.1001-196X.2025.04.009

Abstract：In the domain of mechanical manufacturing,the performance optimization of high-speed punch presses has consistently been a critical research focus.This study investigates the correlation between pressure fluctuations in the hydraulic system of high-speed punch presses and the quality of the workpiece's shear surface.Based on practical operating conditions and theoretical foundations,a meticulously designed blanking model for punch presses was established.Advanced simulation techniques were employed to conduct comprehensive analyses of the blanking process under various conditions,and an experimental platform was constructed for validation.The findings revealed that the accumulator return hydraulic system exhibited significant advantages.Regarding the reduction of the pressure variation range in the hydraulic cylinder:the pressure fluctuation in the low-pressure oil return rod chamber ranged from 7 MPa to 5.7 MPa(a variation of 1.3 MPa),whereas in the accumulator return system,the pressure fluctuated between 3 MPa and 3.8 MPa(a variation of 0.8 MPa).This demonstrates that the accumulator return method effectively stabilizes pressure variations and mitigates adverse effects caused by abrupt pressure changes.In terms of enhancing the quality of the steel plate's shear surface,after blanking various types of steel plates,it was observed that this method significantly reduces the fillet size,increases the proportion of the bright band by an average of 33％compared to the low-pressure oil return method,and eliminates the issue of tear band cracks on the shear surface present in the low-pressure oil return method.Additionally,it reduces stress concentration,substantially improving the quality of the blanked parts.These results provide essential evidence and robust support for the optimization of the hydraulic system in high-speed punch presses.