注射成型塑件产生缺陷的原因分析

Analysis on the Causes of Defects in Injection Molding Plastic Parts

讨论了流痕及喷射纹的形成原因及改善方法,流痕主要从塑料、模具、射出成型机3个方面分析对塑件产生流痕的影响,喷射纹从浇口尺寸,注射速度,树脂粘度,保压等方面分析.对镜面塑件流痕问题,通过改变成型参数进行改善.对手机电池盖喷射纹缺陷,通过运用MoldFlow分析不同塑胶原料的流动及充填情况,确定了将该塑件的成型材料由原来的PC料改变为PC+ABS,通过试模,外观及尺寸均达到设计要求.

This paper discussed the causes and improvement methods of the flow marks and spray marks,it mainly analyzed the influence of flow marks on plastic parts from three aspects:plastic,mold and injection molding machine,in the spray aspect,it analyzed from gate size,injection speed,resin viscosity,pressure and others.Improve the flow marks problem of mirror plastic parts by the forming parameters changing.In the aspect of spray marks on cell phone battery cover,this paper analyzed the flow and filling of different plastic materials by Moldflow to determined that the molding material of the plastic parts are changed from the original PC to PC+ABS,in the mold test,the appearance and size meet the design requirements.