부산대학교 도서관

In an expected motion curve, signal attenuation or delay is often caused by the control model of a machine or its operating efficiency. Thus, the expected motion state often differs from the actual motion state. In addition, stamping products may have unexpected defects. In this study, the effect of motion curve errors on the forming properties of a direct-drive servo press was explored. First, a mechanical model of a direct-drive servo press was developed to rate theoretical motion curves. Subsequently, a laser measurement system was used to measure actual motion curves. The motion curve errors were optimized using integrated error criteria, and the most suitable integrated error criterion was identified to yield the smallest error. In addition, the optimized motion curve distribution was determined. Finally, the finite-element method was adopted to explore the V-bending manufacturing process and assess the changes in mechanical properties before and after motion curve optimization. The study results revealed that among the four adopted integrated error criteria with different stroke velocities, the integral square error criterion was the most suitable. This criterion can effectively reduce the differences between theoretical and actual motion curves. Accordingly, the aforementioned criterion was adopted for optimization, and the forming time was improved by 0.258–15.07%. According to V-bending simulations, the actual motion curves exhibited a strain rate attenuation of 8.74–20.98% at a stroke velocity of 5–20 strokes/min. [ABSTRACT FROM AUTHOR]