多区间热压对拉挤制件成型质量的影响  

EFFECT OF MULTI-INTERVAL HEATING ON THE FORMING QUALITYOF ADVANCED PULTRUSION PARTS

作　　者：王宇 齐俊伟[1] 王跃全[1] 肖军[1] WANG Yu;QI Jun-wei;WANG Yue-quan;XIAO Jun(College of Material Science and Technology,Nanjing University of Aeronauticsand Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《玻璃钢／复合材料》2019年第10期10-18,共9页Fiber Reinforced Plastics/Composites

基　　金：国家重点基础研究发展计划(2014CB046501);江苏高校优势学科建设工程。

摘　　要：先进拉挤成型技术以预浸料为原材料,通过不同铺层组合实现制件的力学性能可设计性,在控制生产成本及灵活性方面具有独特的优势,本课题选用X850预浸料进行研究,分析其典型热压罐成型工艺和先进拉挤成型工艺的区别,针对先进拉挤成型中热压固化的特点,分析各区间在制件成型过程中的作用,利用差式扫描量热法(DSC)研究X850预浸料中树脂的固化动力学,确定各区间温度制度选取原则,为了防止孔隙的形成与扩大,合理选取各区间压力制度,运用正交试验的方法设计固化工艺方案,研究多区间温度制度、压力制度对拉挤制件成型质量的影响趋势,运用实验室自行设计的拉挤设备进行试样的制备,以弯曲强度、层间剪切强度、孔隙率为表征在正交试验方案中优选了6号方案(预处理温度为160℃,保温30 min,固化温度为180℃,保温时间为20 min,固化压力为0.8 MPa)为最终拉挤工艺方案。Advanced pultrusion molding technology takes prepreg as raw material,realizes the mechanical property designability of the parts through the combination of different layers,and has unique advantages in controlling the production cost and flexibility.This subject selects X850 prepreg for research,analyzes the difference between its typical hot pressing tank forming process and advanced pultrusion process.The function of each interval in the forming process is analyzed for the characteristics of hot-pressure curing in advanced pultrusion molding.The curing kinetics of resin in X850 prepreg is measured through differential scanning calorimetry.The selection principle of temperature system in each interval is determined.In order to prevent the formation and growth of pores,the pressure system of each interval is reasonably selected.A curing process experimental scheme is designed by means of orthogonal experiment,and the influence trend of multi-interval temperature system and pressure system on the forming quality of parts is studied.The specimen is prepared by the equipment designed by the laboratory,and the scheme No.6(with pretreatment temperature at 160℃for 30 min,curing temperature at 180℃for 20 min and curing pressure at 0.8 MPa)is selected as the final pultrusion process in the orthogonal test scheme,for which the bending strength,interlaminar shear strength and porosity are characterized.

关 键 词：先进拉挤 预浸料 DSC 固化度 孔隙率 

分 类 号：TB332[一般工业技术—材料科学与工程]