软模成型工艺中软模的膨胀行为及压力平衡研究  

Study on thermal expansion behavior and pressure balance of soft mode during soft-die forming process

作　　者：马腾飞 郭子民 李桂洋 郑国栋 李伟明 MA Tengfei;GUO Zimin;LI Guiyang;ZHENG Guodong;Li Weiming(Aerospace Long March Arimt Science and Technology Co.,Ltd.,Tianjin 300475,China;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China)

机构地区：[1]航天长征睿特科技有限公司,天津300475 [2]航天材料及工艺研究所,北京100076

出　　处：《复合材料科学与工程》2024年第5期107-113,共7页Composites Science and Engineering

基　　金：天津市科技计划项目(20YFZCGX00230)。

摘　　要：软模的膨胀加压行为匹配性是复合材料软模成型的关键,为了实现软模成型工艺中软模压力的可控,本文研究了软模材料的压缩泊松比、膨胀行为及压力平衡特性。将软模成型工艺中软模膨胀加压过程分为软模自由膨胀、半自由膨胀加压、体积受限膨胀加压三个阶段,对软模不同阶段进行变形及压力理论分析,采用软模升温测试系统测试软模的尺寸及压力变化。基于上述理论设计了软模尺寸,优化了固化工艺,采用优化后的软模成型工艺制备了C形梁和工字梁,并表征了C形梁和工字梁内部质量和尺寸精度。结果表明,软模材料的压缩泊松比为0.495,软模不同阶段的的膨胀行为及压力平衡特性与理论分析相符,通过软模尺寸设计及固化工艺优化实现了软模成型过程中压力的精确控制,由此制备出了内部质量好、尺寸精度高的复合材料C形梁和工字梁。The matching of the expansion and pressurization of soft modes was the key to the soft molding of composites.In order to control the pressure of soft die in the process of soft die forming,the compression Poisson's ratio,expansion behavior and pressure balance characteristics of soft mold were studied.The expansion and pressurization processes was demarcated into three steps,including free expansion,semi-free expansion and pressurization and volume-limited expansion and pressurization of soft mold.The deformation and pressure theory of different stages of soft modes were studied,and the size and pressure changes of soft modes was measured by soft mode heating system.The size of the soft die was designed based on the above theory,and the curing process was optimized.The C-beam and I-beam were fabricated by soft-mold forming technology,and the internal quality and dimensional accuracy were characterized.The experimental results show that the compression Poisson's ratio of soft mold material is 0.495,and the expansion behavior and pressure balance characteristics of the soft modesare consistent with the theoretical analysis in different stages.The precise control of pressure in the process of composite soft die molding is realized through the size design and curing process optimization,and the C-beam and I-beam with excellent quality and high dimensional accuracy are successfully fabricated.

关 键 词：软模 泊松比 膨胀行为 压力平衡 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]