热压成形工艺参数对玻纤增强聚丙烯U型骨架成形质量的影响  

Influence of hot-pressing process parameters on forming quality of glass fiber reinforced polypropylene U-shaped skeleton

作　　者：江佰龙 唐华平[1] 石武平 翟瞻宇[1] JIANG Bai-long;TANG Hua-ping;SHI Wu-ping;ZHAI Zhan-yu(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《塑性工程学报》2023年第9期78-85,共8页Journal of Plasticity Engineering

基　　金：湖南省自然科学基金青年基金资助项目(2021JJ40735)。

摘　　要：研究了玻璃纤维增强聚丙烯复合材料层合板热压成形工艺参数表面温度、成形压力和模具温度对U型骨架成形质量的影响。通过实验测试了U型骨架的层间剪切强度,观测了表面形貌和截面尺寸精度。结果表明,当提高表面温度和成形压力时,树脂基体的流动性变好,树脂基体在热压过程重分布,提高了U型骨架的层间剪切强度,改善了表面粗糙度,但过高的表面温度和成形压力会将树脂挤出,从而降低成形质量;表面温度和模具温度共同影响U型骨架截面几何尺寸精度,温度越高,弹性前屈效应越明显,若继续提高成形温度,前屈效应会趋于恒定。在U型骨架成形过程中,由于成形压力对底部和侧边的作用不同以及层合板表面温度不均匀,底部的成形质量较侧边区域要好。在现有条件下,获得的较优工艺参数为:加热电压70 V,加热时间60 s,表面温度246.1℃,成形压力1.2 MPa,模具温度80℃。The influence of hot-pressing process parameters of surface temperature,forming pressure and die temperature of glass fiber reinforced polypropylene(GF/PP)composites laminates on the forming quality of U-shaped skeleton was studied.The interlaminar shear strength of the U-shaped skeleton was tested,the surface morphologies and dimensional accuracy of section were observed.The results show that when the surface temperature and forming pressure increase,fluidity of resin matrix becomes better,resin matrix redistributes during hotpressing process,the interlaminar shear strength of U-shaped skeleton increases and the surface roughness is improved.However,excessive surface temperature and forming pressure can extrude the resin,thus reeduce the forming quality.The geometric dimensional accuracy of U-shaped skeleton section is affected by both surface temperature and die temperature.The higher the temperature,the more obvious the elastic forward bending effect.If the forming temperature continues to increase,the forward bending effect tends to be constant.During the forming process of U-shape skeleton,the forming quality of the bottom is better than that of the side area due to the different effects of forming pressure on the bottom and side and the uneven surface temperature of the laminate.The optimal process parameters obtained under the existing conditions are:heating voltage of 70 V,heating time of 60 s,surface temperature of 246.1℃,forming pressure of 1.2 MPa,die temperature of 80℃.

关 键 词：玻璃纤维 热塑性复合材料 热压成形 层间剪切强度 

分 类 号：TB332[一般工业技术—材料科学与工程]