玻璃纤维增强制件注射成型过程的模具磨损原因及规律  

Reason and Regularity of Injection Mold Wear for Glass-fiber-reinforced Part

作　　者：高易仁 王敏杰[1] 李红霞[1] GAO Yiren;WANG Minjie;LI Hongxia(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《中国塑料》2020年第8期44-49,共6页China Plastics

摘　　要：玻璃纤维增强聚醚酰亚胺(PEI)薄壁制件注射成型过程中,易对模具型芯产生磨损,从而严重影响制件成型品质。以某型号手机听筒薄壁制件为例,根据生产实践分析了型芯表面的微观磨损特性,采用数值计算方法研究了型腔近壁面的熔体流动行为以及型芯表面材料的冲蚀破坏形式与磨损规律。结果表明,注塑过程中型芯表面材料发生冲蚀磨损形成月牙形凹槽,型腔近壁面上的熔体流速决定了月牙形凹槽的形貌和尺寸,玻璃纤维粒子的入射角和倾角决定了型芯表面材料的冲蚀破坏形式,冲蚀磨损量随着玻璃纤维粒子侧倾角的增大不断增加,随着入射速度的增大呈指数型增加。In the injection molding process of the thin-walled part based on glass-fiber-reinforced polyetherimide,the core of the mold is easily worn,which seriously affects the quality of the part. Taking the thin-walled part of certain mobile phone as an example,and the micro wear characteristics of the core surface were analyzed in view of the practical production,and the melt flow behavior near the wall of the cavity and the erosion failure form and wear law of the surface material of the core were studied by a numerical method. The results indicated that during the injection process,the surface material of the core was eroded to form a crescent shaped groove,and the melt velocity near the wall of the cavity determined the shape and size of the crescent shaped groove. The incidence angle and dip angle of the glass fiber particles determined the erosion failure form of the material on the surface of the core. The wear amount increased with an increase of the roll angle of glass fiber particles,and the increment was exponential with an increase of the incidence speed.

关 键 词：玻璃纤维增强聚醚酰亚胺 薄壁制件 注射成型过程 模具型芯 冲蚀磨损 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]