模流分析在解决含嵌件塑件微裂纹中的应用
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摘要
对于含金属嵌件的安全带扣注塑成型后出现开裂现象,采用模流分析技术对带金属嵌件的塑件注塑成型过程进行分析,发现开裂的位置并不是熔接痕所在的位置。通过分析,发现塑件开裂是由收缩不均匀而产生的热应力引起的。因此对塑件的结构设计进行了更改,使含金属嵌件的塑件的微裂纹缺陷得到了切实解决,并且缩短了成型周期,提高了生产效率。
In order to solve the hairline crack of the belt buckle with metal insert after injection moulding,injection moulding simulation of plastic parts with metal inserts was carried out to analyze the cause of the crack.It was found that the location of the crack was not the location of the weld.Through further analysis,it was found that the cracking of plastic parts was caused by the thermal stress due to uneven shrinkage.Therefore,the structural design of plastic parts were changed so that the hairline crack defects of plastic parts with metal inserts were solved effectively,and the injection moulding cycle was shortened and the production efficiency was improved.
In order to solve the hairline crack of the belt buckle with metal insert after injection moulding,injection moulding simulation of plastic parts with metal inserts was carried out to analyze the cause of the crack.It was found that the location of the crack was not the location of the weld.Through further analysis,it was found that the cracking of plastic parts was caused by the thermal stress due to uneven shrinkage.Therefore,the structural design of plastic parts were changed so that the hairline crack defects of plastic parts with metal inserts were solved effectively,and the injection moulding cycle was shortened and the production efficiency was improved.
引文
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[2]邓文华.监护仪壳体上金属嵌件立柱开裂的分析研究[J].医药卫生(全文版),2016(11):00182-00183.
[3]王瑞歌,李延杰,黄荣,等.MOLDFLOW在带嵌件塑件注射过程中的应用[J].模具工业,2010,36(10):14-16.
[4]阮育煌,王建宇,方泽端.带金属嵌件的薄壁塑件注射成型分析与优化[J].模具工业,2013,39(6):50-52.
[5]林权,陈丽军.金属嵌件对注射成型件翘曲变形的影响[J].塑料,2017(4):93-97..
[6] MIKLAVEC M,KLEMENC J,KOSTANJEVEC A,et al.Properties of a metal-nonmetal hybrid joint with an improved shape of the metal insert[J].Experimental Techniques,2015,39(1):69-76.
[7] JIN K,JEONG T,KIM T,et al.Analysis and design for reducing residual stress and distortion after ejection of injection molded part with metal-insert[J].International journal of precision engineering and manufacturing,2014,15(12):2533-2542.
[8] JIN K,KIM T,KIM N,et al.Process chain analysis of the dimensional integrity in a metal-insert polymer smart phone baseplate-from die casting to polymer injection molding[J].Journal of Mechanical Science and Technology,2015,29(4):1703-1713.
[9] CHEN X,LAM Y C,LI D Q.Analysis of thermal residual stress in plastic injection molding[J].Journal of Materials Processing Technology,2000,101(1/3):275-280.
[10] ZOETELIEF W F,DOUVEN L F A,HOUSZ A J I.Residual thermal stresses in injection molded products[J].Polymer Engineering&Science,1996,36(14):1886-1896.
[11] WANG T H,YOUNG W B.Study on residual stresses of thin-walled injection molding[J].European Polymer Journal,2005,41(10):2511-2517.