注射工艺参数对PP薄壁件翘曲的影响  

Effect of injection processing parameters on warpage of PP thin-walled parts

作　　者：宋满仓[1] 孔繁宇 SONG Man-cang;KONG Fan-yu(Institute of Mould and Surface Engineering,Dalian University of Technology,Dalian,Liaoning,116024,China)

机构地区：[1]大连理工大学模具与表面工程研究所,辽宁大连116024

出　　处：《模具工业》2020年第9期7-12,共6页Die & Mould Industry

摘　　要：为了消除薄壁件的翘曲缺陷,以外形尺寸为100 mm×60 mm×1.2 mm、表面带有微米级阵列结构的PP薄壁件为研究对象,设计单因素试验探讨各工艺参数对薄壁件翘曲量的影响,并采用退火工艺进一步减小翘曲变形。试验结果表明:翘曲量随注射压力、注射速度及模具温度的升高而增大,随冷却时间的延长而减小;当熔体温度和保压压力增大时,翘曲量先减小后增大;当注射压力低于60 MPa时,塑件出现反向翘曲现象;退火工艺可使薄壁件翘曲量减小20%~40%。In order to solve the defects of the warpage,the PP thin-walled parts(whose sur⁃face has a micron-scale array structure)with a structure size of 100 mm×60 mm×1.2 mm were taken as the research object.A single factor test was designed to explore the effect of each processing parameter on the warpage degree,and the adoption of annealing pro⁃cess was proposed to further reduce the warpage.The results showed that the warpage in⁃creased with the increase of injection pressure,injection speed and mould temperature,but decreased with the increase of cooling time.When the melt temperature and holding pres⁃sure were increased,the warpage firstly decreased and then increased,and when the injec⁃tion pressure was lower than 60 MPa,the plastic parts appeared reverse warping.In addi⁃tion,annealing process could reduce the warpage of thin-walled parts by 20%to 40%.

关 键 词：注射成型 薄壁塑件 翘曲 退火工艺 

分 类 号：TG76[金属学及工艺—刀具与模具] TQ320.66[化学工程—合成树脂塑料工业]