玻纤增强尼龙复合材料车门拉手座热流道模具设计  

Design of hot runner mould for door handle seat with glass fiber reinforced nylon composite

作　　者：田科[1] TIAN Ke(School of Artificial Intelligence,Jiangxi University of Technology,Nanchang 330098,China)

机构地区：[1]江西科技学院人工智能学院,南昌330098

出　　处：《工程塑料应用》2024年第6期47-54,共8页Engineering Plastics Application

基　　金：江西科技学院校级线下一流课程《金工实习》(江科发[2021]187号)。

摘　　要：在车门拉手座塑件模具设计中,为解决高含量玻璃纤维增强尼龙复合材料成型时容易出现浮纤、收缩各向异性带来的翘曲变形大等潜在品质缺陷问题,运用CAE辅助分析对塑件的成型方案进行了优化分析。将浇注系统优化为潜伏式双浇口浇注系统,浇口的进胶直径为1 mm,流道结构由三级冷流道+一级热流道组成。所获得的浇注效果为:引起浮纤发生的内外壁模温差控制在38℃以下(标准值≤50℃);主要外观面盖面的纤维取向张量范围为0.7373~0.9986,能有效保证盖面的结构强度;塑件最大翘曲变形量为1.024 mm,能保证塑件关键尺寸的成型精度满足MT3级A类精度要求;基于玻纤增强的模腔成型收缩率各向差异化设置分别为X向0.3%,Y向0.1%,Z向0.2%。与优化结果对应的注塑工艺参数为:模温89.4℃,料温292.4℃,注射压力92 MPa,冷却水温度25℃,注塑周期38 s。模具结构为一种两板式热流道模具,一模两腔布局,模具中采用脱模方向集成法设计了3种脱模机构,其中的定模推板斜顶机构和油缸推板型斜抽芯机构对同类塑件脱模机构设计有较好的参考作用。In the design of the mould for the car door handle seat plastic part,in order to solve the potential quality defects such as floating fibers and large warping deformation caused by shrinkage anisotropy during the molding of high content glass fiber reinforced nylon composites,the CAE auxiliary analysis method was used to optimize the molding plan of the plastic part.The gating system in the plan was optimized to be a double-submarine-gate gating system,with the gate inlet diameter of 1 mm,and the flow channel structure consisting of a three-stage-cold-runner and a hot-runner.The obtained gating effect is that the mould temperature difference between the inner and outer wall that causes floating fibers is controlled below 38℃(standard value≤50℃);the probability range of fiber orientation tensor on the main appearance surface cover is 0.7373-0.9986,which can effectively ensure the structural strength of the cover surface;the maximum warping deformation of the plastic part is 1.024 mm,which can ensure that the forming accuracy of the key dimensions of the plastic part meets the MT3 Class A accuracy requirement;the anisotropic molding shrinkage rate of the cavity based on glass fiber reinforcement is set to 0.3%in the X direction,0.1%in the Y direction,and 0.2%in the Z direction,respectively.The optimized injection molding process parameters are as follows:mould temperature of 89.4℃,material temperature of 292.4℃,injection pressure of 92 MPa,cooling water temperature of 25℃,and injection molding cycle of 38 s.The mould structure is a two plate hot runner mould,the mould cavity layout is one mould with two cavities.Three demoulding mechanisms were designed by using the demoulding direction integration method in the mould,of which the fixed mould ejector plate lifter mechanism and the hydraulic cylinder ejector plate angle core pulling mechanism had a good reference for demoulding mechanism design of similar plastic parts.

关 键 词：复合材料 玻纤增强 尼龙 注塑 CAE优化 各向异性 模具设计 收缩率 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]