一种新型喷射式点胶一致性控制方法

摘要

A new consistency control method for jet dispensing is proposed. First, the working parameters, namely, viscosity, supply pressure and supply time, are experimentally investigated. Then, the glue viscosity is approximated by a polynomial model using the least square method. Based on this model and temperature control implemented using the Dahlin principle, the viscosity of the glue can be maintained at a constant value. Then, the viscosity model of the glue is applied to deriving the droplet mass as the nominal model of the temperature controller. The robustness of the temperature controller is analyzed by applying the small gain theory. The glue supply pressure controller is designed using the consistency control strategy, and the robustness is analyzed. Finally, simulations and experiments are conducted using a jet dispensing control system. The results show that the proposed control strategy can significantly improve the droplet consistency.%提出一种新的喷射式点胶一致性控制方法.首先,通过实验研究胶液黏度、供胶压力、补胶时间等工作参数的影响规律,并基于最小二乘法建立了胶液黏度的多项式模型.然后基于黏度模型与温度特性,采用Dahlin算法设计了温度控制器,可在一定时间范围内将胶液的黏度维持在恒定的水平.基于胶液的黏度模型,建立了胶滴质量的温度控制系统的名义模型,基于小增益原理分析了温度控制系统的稳定性.而后进一步设计了供胶压力控制器,结合温度控制实现了出胶量的一致性控制.最后通过仿真与实验说明了本控制方法的有效性.