工艺参数对带有网格的框形薄壁塑件表面质量的宏观影响

Process Parameters on the Frame with A Grid on the Surface of the Thin-Wall Injection Molding Quality Macro Impact

以某空调面框研究为案例,针对带有网格的框形薄壁塑件容易出现的缩痕问题,首先构建空调面框三维模型,建立浇道系统和冷却流道。在运用数值模拟和4水平正交试验L_(16)(4~6为4水平6因素)的基础上,利用信噪比中的望小特性,以注射时间、模具温度、熔体温度、保压压力、保压时间、冷却时间为设计变量。采用均值分析和方差分析技术得到各参数对缩痕指数的影响显著性:保压压力>熔体温度>保压时间>冷却时间>模具温度>注射时间;并获得了稳健最优的工艺参数组合A_4B_3C_1D_2E_3F_1,最后通过Mold Flow软件模拟验证其正确性,得到缩痕指数降低为3.054%。同时得到的推荐的螺杆速度可以指导实践生产。

For with grid frame of thin-wall injection molding parts are prone to shrink markproblem, based on a surface air conditioning box research as an example, building airconditioning box 3d model first, to establish gating system and cooling flow channel. The use ofnumerical simulation and four levels orthogonal experiment L_(16)(4~6 four level six factors), on thebasis of using the signal-to-noise ratio of small features, injection time, mold temperature, melttemperature, packing pressure, packing time, cooling time as design variables. Using the meanand variance analysis technology to get the influence of various parameters on the shrinkagemark index significance: packing pressure>melt temperature>packing time>cooling time>moldtemperature > injection time; And robust optimal process parameters combination A_4B_3C_1D_2E_3F_1,finally by Moldflow software simulation verify its correctness, shrink mark index decreased to 3.054%. At the same time, get the recommended screw speed can guide practice production.