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为保证复合材料预浸带始终处于适宜铺放成型的工艺窗口内,自动铺带(ATL)成型过程中需要对预浸带的铺放温度进行精确控制。为适应高速率自动铺放,需要研究新的高效加热及精确控制方法。本文提出高加热效率、高响应速率的红外辐射加热方案。通过对红外热源与预浸带能量传输过程的分析,提出了红外加热过程中各传递系数的计算方法和公式。基于各传递系数的分析,建立了静止及运动状态下的红外加热控制方程,并通过两种状态下控制方程的对比,提出了红外辐射稳态因子概念。以静止状态下的实验数据为依据,利用红外辐射稳态因子,经理论推导,获得了预浸带匀速运行时的温度控制律,为红外加热技术在自动铺带成型中的应用奠定基础。
In order to ensure that the composite prepreg tape is always placed in a process window suitable for placement and molding, automatic placement (ATL) molding process requires accurate control of the prepreg tape placement temperature. To accommodate high rates of automatic placement, new efficient heating and precise control methods need to be studied. In this paper, high heating efficiency, high response rate infrared radiation heating scheme. Through the analysis of the energy transfer process of infrared heat source and prepreg belt, the calculation methods and formulas for each transfer coefficient in infrared heating process are proposed. Based on the analysis of each transfer coefficient, the infrared heating control equations at rest and in motion are established. The concept of steady-state infrared radiation factor is proposed by comparing the governing equations under two states. Based on the experimental data at standstill, the temperature control law of prepreg with uniform speed was obtained by using the steady-state factor of infrared radiation and the theory deduction, which laid the foundation for the application of infrared heating technology in automatic tape lay-up.