复合材料构件热压罐成型模具温度均匀性分析

热压罐固化中成型模具的温度分布对复合材料固化质量有显著影响,提高与构件直接接触的模具型面温度均匀性有利于改善内部温度梯度,减小固化变形,提高成型精度。本文以复合材料构件热压罐框架式成型模具为对象,应用有限元方法,分析模具温度的分布,研究模具支撑结构对型板表面温度均匀性的影响。研究表明,支撑板厚度越薄,温度均匀性越好,与进气风口平行方向的支撑板对温度均匀性的影响更为显著,因此可优先考虑增加与进气风口垂直方向支撑板厚度来增加模具刚度。在保持面积不变的前提下,改变散热孔的形状,发现菱形与圆形散热孔具有较强的抗变形能力,而方形散热孔使得型板表面温度分布更加均匀。通过控制散热孔的布局改变风道时,发现T型风道对于改善温度均匀性的效果最佳。

Analysis of Temperature Field Uniformity of Composite Mold in Autoclave

In the autoclave curing, the temperature distribution of the molding die has a significant effect on the curing quality of the composite. Increasing the temperature uniformity of the mold profile in direct contact with the component is beneficial to improve the internal temperature gradient, reduce the curing deformation, and improve the molding precision.Taking the composite component frame of the autoclave frame as the object, the finite element method is applied to analyze the distribution of the mold temperature, and the influence of the mold support structure on the surface temperature uniformity of the form is studied.Studies have shown that the thinner the thickness of the support plate, the better the temperature uniformity, and the influence of the support plate which is parallel to on the inlet air vent on the temperature uniformity is more significant. Therefore, it is preferred to increase the thickness of the support plate in the vertical direction of the inlet vent to increase die stiffness. Under the premise of keeping the area constant, the shape of the heat dissipation hole is changed, and it is found that the diamond shape and the circular heat dissipation hole have strong deformation resistance, and the square heat dissipation hole makes the surface temperature distribution of the template more uniform.When the airduct is changed by controlling the layout of the heat dissipation holes, it is found that the T-s-haped air passage is the best for improving the temperature uniformity.