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建立了热塑性碳纤维预浸丝铺放过程中二维温度场分布的模型。考虑铺放中热气筒的热气速率、热气温度的影响,当热气流速从650升高至800 m/s时,APC2的对流传热系数增加150 W/(m2.℃)。利用ANSYS对整个铺放过程热量的瞬态热传导进行了仿真,得到复合材料构件在整个铺放过程中温度场分布及其随时间的变化。通过对铺放头分别以40和20 mm/s进行铺放时温度场随时间变化的比较,可知铺放头移动速率越慢,粘合点处的温度峰值越高。当把铺放头移动速率降至20 mm/s以后,粘合点温度峰值升至355℃以上,达到APC2的熔点,因此在此条件下加工时铺放头移动速率理论上应低于20 mm/s。通过对比,证明了温度场数学模型的正确性。
The model of two-dimensional temperature field distribution during the laying process of thermoplastic carbon fiber pre-impregnated silk was established. Considering the influence of the hot gas velocity and the temperature of the hot gas in the hot gas tank laying, the convective heat transfer coefficient of APC2 increases by 150 W / (m2. ℃) when the hot gas flow rate increases from 650 to 800 m / s. ANSYS was used to simulate the transient heat conduction of the whole laying process. The temperature field distribution and its change with time of the composite material during the entire laying process were obtained. By comparing the change of temperature field with laying time of laying head at 40 and 20 mm / s respectively, we can see that the slower the head moving speed, the higher the temperature peak at the bonding point. When the head moving speed is lowered to 20 mm / s, the peak temperature of the bonding point rises to above 355 ° C and reaches the melting point of APC2, so the head moving speed should be theoretically lower than 20 mm / s. By comparison, the correctness of the mathematical model of temperature field is proved.