GLARE层板热态气压成形工艺参数影响规律研究

Research on the influence law of GLARE laminates hot pressure forming process parameters

以玻璃纤维增强金属层合板(GLARE)为对象,研究单曲率GLARE层板的热态气压成形性能。分别针对热固性和热塑性树脂基GLARE层板,以成形试件的壁厚分布和成形深度为表征参数,试验探究了温度和压强2个关键工艺参数对不同树脂基体GLARE层板热态气压成形性能的影响机理和规律。结果表明:成形温度过高会使得2类树脂均发生分解失效,导致层板出现分层、破裂等缺陷;高温下熔融状态树脂的流动性增加,上下层板的挤压使其沿径向向外流动,使得试件中心厚度减小;同时,压边圈的压力作用引发树脂堆积,使得圆角区域层板厚度增加。温度为110~140℃时,热固性树脂基GLARE层板成形质量良好,试件贴合模具的最低压强为4 MPa;温度在170~200℃区间内时,热塑性树脂基GLARE层板成形质量最优,试件贴合模具的最低压强为3 MPa。

The hot pressure formability of glass fiber reinforced metal laminates(GLARE)with single curvature is studied.Based on the wall thickness distribution and forming depth of specimens,the influence mechanism and law of temperature and pressure on the hot pressure formability of the thermosetting and thermoplastic resin based GLARE laminates are explored experimentally.The results show that the high temperature would cause the decomposition failure of the two kinds of resins,leading to laminates defects such as delamination and rupture.At high temperature,the fluidity of the molten resin increases,and the extrusion of the upper and lower plates makes the resin flow outward along the radial direction,which reduce the thickness of the center of the specimen.At the same time,the pressure of the blank holder lead to the accumulation of resin,which increases the thickness of the laminates in the rounded corner area.When the temperature is 110~140℃,the formability of the thermosetting resin prepreg GLARE is good,and the lowest pressure of the specimen laminate mold is 4 MPa.When the temperature is between 170℃and 200℃,the formability of the thermoplastic resin prepreg GLARE is optimal,and the minimum pressure of the specimen laminate mold is 3 MPa.