薄壁塑件注射压缩成型热残余应力仿真研究.pdf

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1、第40卷第7期塑料工业2012年7月CHINAPLASlrrICSINDUSTRY·35·薄壁塑件注射压缩成型热残余应力仿真研究邱庆军，蒋炳炎，陈磊，楚纯朋，StephenKirchberg(1．中南大学机电工程学院，高性能复杂制造国家重点实验室，湖南长沙410083；2．InstituteofPolymerMaterialsandPlasticsEngineering，ClausthalUniversityofTechnology，Clausthal—Zellerfeld，38678，Germany)摘要：使用MoldflowMPI／Injection’compres

2、sion模块对薄壁塑件顺序注射压缩成型工艺进行了仿真，采用单因素试验研究了熔体温度、模具温度、延迟时间、压缩距离、压缩速度、压缩压力和保压压力对脱模后热残余应力的影响。仿真结果表明，顺序注射压缩成型薄壁制件热残余应力分布规律与常规注射成型相似，但是前者热残余应力较小且沿流动方向更为均匀；热残余应力随熔体温度、模具温度、压缩距离、压缩速度的增加而减小，随延迟时间和保压压力的增加而增大；压缩压力大于熔体流动阻力后，继续增大压缩力对热残余应力无影响。关键词：薄壁塑料件；注射压缩；热残余应力；仿真中图分类号：TQ320．66文献标识码：A文章编号：1005—5770(2012)

3、07—0035—05StudyonThermalResidualStressofInjectionCompressionMoldedThin。walledPlasticPartbySimulationQIUQing-jun，JIANGBing—yan，CHENLei，CHUChun—peng，StephenKirchberg(1．StateKeyLaboratoryforHighPerformanceandComplexManufacturing，CentralSouthUniversity，Changsha410083，China；2．InstituteofPolym

4、erMaterialsandPlasticsEngineering，ClausthalUniversityofTechnology，Clausthal。Zellerfeld38678，Germany)Abstract：Sequentialinjectioncompressionmoldingofathin‘walledplasticpartwassimulatedincon—mercialsoftwareMPI／injection。compression．Theeffectsofvariousprocessingparameters，i．e．melttemper-atu

5、re，moldtemperature，presswaitingtime，pressdistance，pressspeed，pressforceandpackingpressureonpartthermalresidualstresswereinvestigatedthroughsinglefactorexperimentdesign．Theresultsshowedthatthoughthermalresidualstressdistributionofsequentialinjectioncompressionmoldedpartsharessimilari—ties

6、withthatoftraditionalinjectionmoldedones，theformershowssmallerthermalresidualstress，andthatthermalresidualstressincreasedwithincreasingmelttemperature，moldtemperature，pressdistanceandpressspeed，whiledecreasedwithincreasingpresswaitingtimeandpackingpressure．Theeffectofpressforce，however，h

7、adnegligibleeffectonthermalresidualstressonceitbecamelargerthanthevaluehighe-noughtopushthemeltbacktotherunneragainsttheappliedpackingpressure．Keywords：Thin‘wallPlasticPart；InjectionCompression；ThermalResidualStress；Simulation薄壁塑件凭借成本低、质量轻、易组装集成等优大、收缩翘曲严重，已经越来越难以满足精密光学领势，