摘要
氟塑料/金属密封件在航天系统中应用广泛,氟塑料与金属间的连接质量决定了其密封效果,影响系统运行的可靠性。文中基于航天液氧阀密封件,分别简化得到氟塑料/金属密封件的压力场和温度场数值计算模型。对氟塑料填充燕尾槽过程中氟塑料的中心压力、燕尾槽周边压力及温度场进行分析,得到不同熔体温度时氟塑料的压力变化及不同初始熔体温度时氟塑料与金属模具的温度场变化。结果表明,氟塑料优先填充远离中心区域的燕尾槽外侧区域,最后填充靠近中心的燕尾槽内侧区域,导致燕尾槽区域的熔体压力场分布不均;各区域填充压力随熔体温度升高均有不同程度下降,结合实际加工情况,文中基于数值模拟方法对现有模压工艺进行完善,得到了模具压力从初始的2.2 MPa逐步提升至12.5 MPa的施压曲线。
Fluorine plastic/metal seals are widely used in aerospace systems,and the quality of the connection between fluorine plastic and metal determines its sealing effect and affects the reliability of system operation.In this paper,based on the aerospace liquid oxygen valve seals,the pressure field and temperature field of fluoroplastic/metal seals were simplified to obtain the numerical calculation model respectively,and the central pressure of fluorine plastic,pressure around the dovetail groove and temperature field were analyzed during the process of filling the dovetail groove with fluorine plastic.The pressure changes of fluoroplastics at different melt temperatures and temperature field changes of fluoroplastics/metal parts at different initial melt temperatures were obtained.The results show that fluoroplastics preferentially fill the outer dovetail groove region away from the center region and finally fill the inner dovetail groove region close to the center,resulting in uneven distribution of the melt pressure field in the dovetail groove region;the filling pressure in each area decreases to a different extent with the increase of melt temperature;according to the actual processing situation,the mold pressure is gradually increased from the initial 2.2 MPa to 12.5 MPa.
作者
楼爽
马秀清
任子初
孔祥号
安瑛
Shuang Lou;Xiuqing Ma;Zichu Ren;Xianghao Kong;Ying An(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2024年第5期87-98,共12页
Polymer Materials Science & Engineering
关键词
氟塑料
模压成型
数值模拟
燕尾槽
fluorine plastic
compression molding
numerical simulation
dovetail groove
