Shanghai Daoqin Plastics Co., Ltd.

mold temperature degree effect/influence injection molding processing product quality and production efficiency, it main/primary through mold cooling system 进行适当 control and adjustment. cooling water can processing formed simple 直孔, 当 injection molding parts 形状 complex 时# its cooling 效果差, parts deformation large. Jacobs发现 use copper alloy material made as cooling injection molding mold, its production efficiency relatively cooling mold improve/increase 70% left right, meanwhile injection molding products quality has relatively large improvement. is 此, research use injection molding process soft parts for injection molding cooling process 进行三维 cooling 模拟, research cooling water for injection molding process and production efficiency effect/influence.
1 材 material and methods
1.1 香 box/case parts structure
    以一 香 box/case parts is 例, its structure 如图1 示. parts outer dimensions is 65mm×65mm×75mm. 总体积 is 5.0×104mm3. product utilizing injection molding, its material is ABS, setting shrinkage rate is 0.55%. mold using/adopting 一模一腔 structure, use 盘形浇注 system.

1.2 传统 cooling solution/scheme
    box/case parts mold using/adopting cooling water 道（DCC） can design types cooling solution/scheme. solution/scheme 一（DCC1）见图2（a） type using/adopting mono cooling water 道, is 10mm; solution/scheme 二（DCC2）见图2（b） type using/adopting di cooling water 道, is 10mm; solution/scheme 三（DCC3）见图2（c） type using/adopting cooling water 道, is 8mm another, type separation most small has 35mm, in types cooling solution/scheme in using/adopting sheet/plate cooling water 道, is 18mm.
 

1.3 随形 cooling solution/scheme
    products 形状, mold type 腔部位 cooling is 圆柱面. for/regarding cooling water 道（CCC） can design types cooling solution/scheme. solution/scheme 一（CCC1）如图3（a） 示, using/adopting 螺旋形空间 structure, cooling water 道直径 is 8mm, solution/scheme 二（CCC2）如图3（b） 示, using/adopting ring 形空间 structure, cooling water 道直径 is 8mm. in types cooling solution/scheme in, type 芯部位 still 然采取隔 sheet/plate cooling.

1.4 injection molding cooling has 限元模拟
    using/adopting use injection molding soft parts MPI进行 injection molding process 模拟. using/adopting Fusion网格, its 网格数 is 13270, ratio rate is 92.1%, injection molding material selection Lustran ABS Elite HH1287. in MPI in 建立 两 types cooling solution/scheme has 限元模 type 如图4 示, its and mold cooling related process parameters is: mold opening time 5s, holding pressure time 10s filling time 1.7s, melt temperature degree 230℃, mold temperature degree 50℃, cooling is water, temperature degree is 25℃, 入口雷诺数 is 10000.

2 模拟结果 and analysis
    use MPI soft parts C-W-F analysis process/workflow for box/case injection molding products injection molding process 模拟, cooling solution/scheme molding cycle C, cooling time t and cooling 不均 引起 parts most large warpage deformation w如 table/sheet 1 示.

table/sheet 1 几 types cooling solution/scheme analysis 结果

    from table/sheet 1 can 看出: for cooling solution/scheme, its cooling time large small is tDCC1＞tDCC2＞tDCC3, in sleeve/set solution/scheme conditions lower cooling time versus has 5% left right, cooling non-uniform parts most large warpage deformation amount w则 rigid good versus 反wDCC1＜wDCC2＜wDCC3. DCC1 and DCC2 versus has 3.7% obvious increase large, 差距达 to 42.3%, from above analysis can 看出: use cooling methods, cooling water distribution density increase its cooling efficiency has increase large, due to its type surface 距离不 versus and other, local temperature degree increase large, most increase parts warpage deformation.
    versus for/regarding cooling methods!随形 cooling methods cooling time shrink short 40%, cooling non-uniform parts most large warpage deformation amount has cooling methods 20%, in addition, CCC2 molding cycle and cooling non-uniform most large warpage deformation amount small 于CCC1, for types parts structure, ring cooling structure need excellent 于螺旋形 cooling structure.
    is research cooling process in parts different cooling uniform property, separation 别选取传统 and cooling solution/scheme in cooling efficiency most high, cooling water distribution density versus 当 两 types cooling solution/scheme （即DCC3 and CCC2）做进一步 comparison analysis. in box/case injection molding mold type surface from upper to lower uniform 选取三 部位x, y, z, 位置如图1 示. from 模拟结果 in temperature degree data, analysis 各 采样点 from 1.7-28.0s between type surface temperature degree 变化规律, cooling solution/scheme in x, y, z三采样点 temperature degree 变化曲线如图5 示.

图5 三采样点 temperature degree 变化曲线

    from 图5 in temperature degree 变化曲线 can 看出: in 经 28.0s rear, cooling water mold type surface temperature degree is 29℃, cooling water mold is 40℃, therefore cooling water cooling speed degree obvious excellent 于传统 cooling water 道. another, analysis 三采样点处 temperature degree 变化曲线 can 发现: in cooling water mold in, 三点处 type surface temperature degree need small 于传统 cooling water mold, table/sheet 明随形 cooling water cooling uniform property more excellent, this is 由随形 cooling injection molding to injection molding parts warpage deformation amount relatively small causes.
3 随形 cooling water 道 实 material 验证
    using/adopting cooling solution/scheme CCC2, use selection property light 烧结（SLS） fast speed made process formed mold processing. its large process is: will mold 模芯部 separation 三维STL模 type 导入SLS fast speed formed machine in molding, rear 进行脱脂, high temperature 烧结, copper and other rear 处理, 处理完 formed rear in surface simple machine processing, again 进行模芯 and assembly, formed mold manufacturing process. utilizing mold injection molding processing, to box/case parts injection molding parts 如图6A 示. injection molding process in, cooling time is 18s left right, and 模拟 误差 has 10% most injection molding parts deformation small, obvious defect.