| Fierce international market competition and more personalized, more changes in customer demand for leather products such as footwear and apparel companies need higher requirements in the technology and ability to respond to market. High-speed leather cutting machine is an important tool for leather products manufacturing enterprises to achieve automation, increase productivity, ensure product quality, decrease production costs. However, when compared to the foreign countries, domestic cutting equipment has a gap in terms of performance. In addition, the import of foreign equipment is expensive, inconvenient maintenance. Therefore, the development of proprietary high-speed, high-performance multi-layer leather cutting machine has important practical value for small and medium domestic enterprises to increase the productivity and quality of leather products and strengthen international competitiveness.For the difference on dynamic characteristics, cutting efficiency between domestic multi-layer high-speed leather cutting machine and foreign advanced level. Theoretical modeling, numerical analysis, software simulation and intelligent optimization were applied to analyse and optimize the beam structure and servo control system, the dynamic response ability was improved according to the simulation results. The main contents of the paper are as follows:(1) By comparing the domestic and foreign research status of the leather cutting machine, in order to develop high speed, high quality CNC cutting machine, mechanical structure and servo control system of servo feed system were optimized in this paper.(2) Based on the composition and cutting mechanism of NC leather cutting machine, three-loop PID control was applied to servo drive control system. With X direction for object, the mathematical model was established joined mechanical system model and PMSM model. And PID control parameters were designed based on Simulink. In order to decrease the motion inertia, improve the dynamic response speed, and save energy, Beam structure would be optimized. Beam structure finite element analysis has been done by ANSYS APDL based on leather cutting process.(3) The multi-objective optimization models of the beam and servo control system was established. And Non-dominated Sorting Genetic Algorithm with elitist strategy (NSGA-Ⅱ) was proposed to solve the multi-objective optimization problem. To improve the efficiency of structural optimization, ANSYS APDL analytical procedures of the beam was integrated through multi-disciplinary design platform named iSIGHT. Then orthogonal test was designed to create the second-order response surface approximation model of the beam structure. Finally, NSGA-Ⅱalgorithm was used to optimize iteration. For servo control system, the Simulink dynamic model was integrated by iSIGHT, the PID parameters was Optimized, which driven by the NSGA-Ⅱalgorithm. By comparative analysis of the optimizing results, the superiority of the method of this paper was verified.The dynamic performance of servo system was improved effectively by the way of theoretical analysis, advanced digital software design and intelligent optimization technology, which is good preparation for realizing the integration design mechanical and electrical coupling. Meanwhile, a new way was provided for enterprises to develop high speed, high performance CNC leather cutting machine. There is important engineering practical value to improve the performance of the whole machine. |
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