工装材料和厚度对复合材料热成型性能的影响

Influence of Metal Tooling Materials and Thickness on Properties of Composites Fabrication

不同材料的复合材料金属成型工装具有不同的热特征,热特征影响预浸料固化过程中升降温速率,影响到树脂流动和产品性能。生产高性能的复合材料产品,需要选择和设计升降温曲线接近于材料固化曲线的工装材料和相应厚度的随炉试片工装。文中测试的Invar钢和Q235钢两种材质工装固化曲线,包括Invar工装型面和工装内部、不同厚度随炉试片工装、Q235钢工装温度和升降温速率表征等。不同热量传递方式和低导热率导致了Invar工装的内部温度响应滞后于型面温度响应。作为表征产品性能的随炉试片工装,需要选择与产品工装温度特性匹配的工装作为随炉试片工装。Q235钢的导热率高,工装有较快的温度响应,型面温度均匀。

Different materials of composites metal tooling have different thermal characteristics.Thermal characteristics affect the speed of temperature heating and cooling during the curing process of prepreg,and also the resin flow and product performance.To fabric high-performance composites products,it is necessary to select materials and design tooling with a heating and cooling curve close to the prepreg cycle curve and accompanying test specimens(PCS)tooling with appropriate thickness.The cycle curves of tooling made of invar steel and Q235 steel tested in this paper include those of invar tooling temperature profile and inside of tooling,PCS tooling with different thicknesses,tooling temperature of Q235 steel,and characterized temperature heating and cooling rate.Different heat transfer modes and low thermal conductivity lead to the internal temperature response of invar tooling lagging behind the temperature profile response.As the PCS tooling to characterize the product performance,it is necessary to select the tooling that matches the temperature characteristics of the product tooling as the PCS tooling.Q235 steel has high thermal conductivity,fast temperature response of tooling and uniform profile temperature.