通过与传统的热风加热技术对比并参照国外相关研究,采用红外加热替代热风加热,根据稳态下自动铺放成型的红外加热数学模型,基于自动铺带机的硬件结构,通过采用前馈控制方式、制定相应的控制策略,搭建了以速度为变量、温度为控制量、可编程控制器为控制核心的红外加热温度自动控制系统。实验结果表明:使用红外加热恒温自动控制系统成型的复合材料构件表面光滑、无曲皱,层间间隙与气泡少,预浸带黏性适中,无粘接背衬纸及滑移等现象产生,此加热系统能够满足预浸料高速、变速工况下的温度控制要求。
By contrasting the conventional hot gas heating and consulting relevant literature, this paper proposes the application of infrared heating to replace hot gas heating in an automatic tape laying machine. It employs feedforward control, establishes a relevant control strategy and constructs an automatic infrared heating thermostatic control system. This system is in accordance with the established infrared heating mathematical model under steady state and makes use of the hardware structure of the automatic tape laying machine. It takes speed as the variable and temperature as the variable to be controlled, and uses a programmable logic controller (PLC) as the cybernetic core. The experiment resuts show that the automatic infrared heating thermostatic control system can make composite components with smooth surfaces, little or no buckling, and only a low amount of gaps or bubbles between different prepreg layers. The tape stickiness insures that the prepreg does not bond with the backing paper and no slippage occurs. Thus, this system can satisfy the requirements of automatic thermostatic control under high and variable speed situations.
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