【作者】 张慧；

【导师】 曾良才； 湛从昌； 朱钒；

【作者基本信息】 武汉科技大学 ， 机械电子工程， 2002， 硕士

【摘要】 本论文围绕高速智能液压拉深机的控制系统进行了较深入的理论分析和有针对性的实验研究。所提出的基于极限拉深工艺原理的变速、变压边力拉深方式改善了传统拉深工艺中原有的恒力压边方式；在所开发出的监控软件中运用的智能控制方法进一步提高了系统的控制性能，增加了原有液压拉深机的技术含量。本学位论文主要包括以下内容： 首先，提出了采用变速、变压边力进行拉深的极限拉深工艺原理。在详细阐述了国内外液压拉深机发展概况的基础上，通过对金属板料拉深工艺、变形机理进行分析，提出了一种既能够提高板材成形极限，又能在生产中得到广泛应用的新工艺——变速、变压边力拉深，并重点研究了拉深速度、压边力等重要工艺参数对拉深变形的影响。 其次，将PID控制和模糊控制引入高速智能液压拉深机的压边控制中。本文进行了PID控制算法以及模糊控制算法对系统阶跃响应的对比研究，提出采用增量式PID算法能较好地跟踪给定信号，而采用模糊控制算法能进一步提高系统的动态性能。同时，还进行了基于人工神经网络的自适应控制系统的探索性研究。 最后，使用不锈钢板料进行了带法兰边圆筒件拉深试验。通过对超低拉深系数m=0.50下的拉深试验结果分析发现，采用从大到小到稍大的变压边力控制，比传统拉深工艺中原有的恒压边力控制方式更有利于降低拉深系数，提高拉深成形的表面质量，减少工件拉裂的几率。 本论文还应用工业控制计算机研究并开发了液压拉深机监控系统，为液压拉深机的自动化和智能化提供了充分的条件，并以易操作的界面为高速智能液压拉深机创造了更加方便的调试环境。更多还原

【Abstract】 The thoroughgoing theoretical analysis and the experimental study aimed at the control system of high speed, intelligent controlled hydraulic deep drawing press are carried on in this thesis. Based on the limited drawing technical theory, a way of deep drawing with changeable moving speed and Blank-Holding Force (BHF) is put forward, which improves the traditional mode of drawing with fixed BHF. The control performance is enhanced and the technical content is increased after adopting the intelligent controlling method used in the monitoring and control software, which especially developed for the hydraulic press system. Following substance is included.First, the limited drawing technical theory used in deep drawing with changeable moving speed and BHF is put forward. Based on the study of deep drawing press’ development in the civil and abroad and the distorting theoretical analysis of metal plate, a new technique, that is the way of deep drawing with changeable moving speed and BHF, is put forward. The forming limit can be enhanced and the application can be widely extended by use of this new kind technique. The influence of some important technical parameters such as speed and BHF on deep drawing distortion is also analyzed.Second, the PID control and fuzzy control method are respectively applied into the BHF control of the hydraulic press. The contrasts to step respond between PID control method and fuzzy control method are studied. The given signs can be precisely followed when PID control method acts, however, the system dynamic performance can be further improved when fuzzy control method has effect. In the meantime, the explorative study of neural network adaptive control system is carried on.Finally, the experiments on stainless steel cylinder with flange plate work-piece drawing are made. Under the ultra-low drawing coefficient (m=0.5) drawing conditions, the experimental conclusion shows that the BHF control, which reduce from high pressure to low pressure then rises to medium pressure, are more beneficial to reduce the drawing coefficient than the old drawing mode with fixed BHF control. Meanwhile, the surface quality of the work-piece can be improved and the ratio of cracking in the course of drawing can be cut down.The monitoring and control system with IPC is developed, which provides ample condition for automation and intelligence of the hydraulic press and creates a more convenient and easily operating test environment.更多还原