全闭环控制注塑机的关键技术研究

在综合分析注塑机控制技术发展存在问题以及相关专利的基础上,研究了注塑机的工作循环和注塑过程的三个主要阶段以及影响注塑产品表面质量的主要因素,从总线技术、高速动态响应、模糊控制及电机驱动优化4个方面提出了注塑机全闭环控制的关键技术。结果表明:通过对NCUC-Bus总线协议的应用层进行重新定义,实现了注塑机的压力、位置全闭环控制以及高速动态响应控制和高精度温度控制;通过模糊参数的自寻优得到了全闭环位置控制和全闭环压力控制的边界条件,平滑过渡了二者的切换过程,鲁棒性能良好;同时对交流永磁同步伺服电机优化控制提出了高响应带宽拓宽技术,高刚性抗扰技术,伺服电机在线参数辨识、自整定技术3个实现途径,从而提高了注塑机的性能指标。

Research on Key Technology of Full Closed Loop Control Injection Molding Machine

The comprehensive analysis was based on the problems existed in the development of injection molding machine control technology and related patents. Study was carried out in the three main stages of work cycle and injection molding process of the ma-chine, and the main factors affecting surface quality of injection molding products. The key technology of full closed loop control of in-jection molding machine was proposed from four aspects including bus technology, high speed dynamic response, fuzzy control and e-lectromechanical optimization. The results show that the application layer of NCUC-Bus bus protocol is redefined in order to realize the control of the pressure, position closed-loop control of injection molding machine, high speed dynamic response control and high preci-sion temperature control. The boundary condition of the whole closed-loop position control and closed-loop pressure control was achieved by using the fuzzy parameters of optimal self-searching, and the transition switching process was smoother with strong robustness. Three implementation methods are proposed for the optimal control of alternating current ( AC) permanent magnet synchronous servo motor:high response bandwidth broadening technology, high rigid disturbance rejection technology, on-line parameters identification and self-adjusting technology of servo motor, thus enhanced the performance index of the injection molding machine.