超声振动对高密度聚乙烯收缩特性的影响  

Effect of Ultrasonic Vibration on Shrinkage of HDPE

作　　者：于同敏[1] 祝思龙[1] 包成[1] 黄晓超[1] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,辽宁大连116024

出　　处：《高分子材料科学与工程》2013年第4期33-36,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51175060);国家重点基础研究发展计划(973)项目课题(2012CB025905)

摘　　要：针对材料收缩率这一影响精密注塑制品尺寸精度的关键因素,以中间有两个长孔的平板型塑件为对象,设计制作了一套带有超声振动系统的精密注塑模具,在精密注塑机上进行了施加和未加超声振动的成型实验;并借助X射线衍射分析,研究了不同超声参数作用对收缩率较大的高密度聚乙烯(HDPE)试件收缩率变化的影响关系及其微观作用机理。结果显示,与未加超声振动的试件相比,超声振动能明显降低HDPE材料的收缩率,最高降幅可达16.13%。由此表明,注塑成型过程中施加超声振动,能够有效控制制件的收缩率。Pointed at the shrinkage, the key effect of dimensional accuracy on precision injectlon-molaea parts, an ultrasonic vibration assisted precision injection mold for plate-type plastic part with two slots was designed and fabricated, and the forming experiments with and without ultrasonic vibration were carried out on a precision injection machine. By X-ray diffraction （XRD）, the influence and the mechanism of different ultrasonic field to the shrinkage of high density polyethylene （HDPE） parts with high shrinkage were studied. The experiments show that, under the same injection processing conditions, the shrinkage of HDPE decreases obviously by ultrasonic vibration, with the highest drop of 16.13%. In conclusion, the shrinkage of parts can be adjusted efficiently by uhrasonic vibration in the injection process.

关 键 词：超声振动 精密注塑成型 高密度聚乙烯 收缩率 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]