《专业塑件成型翘曲分析》.pdf

撓曲剛性 Flexural Rigidity 1 M r EI Where 1/r : 的曲率 curvature of the beam M :彎曲力矩 bending moment E 彈: 性模數 modulus of elasticity I : 斷面積對中 立軸的慣性矩 moment of inertia of the cross- sectional area with respect to the neutral axis EI : 撓曲剛性 flexural rigidity 各種一體成型的內鎖件 能增加薄殼的剛性。 A variety of molded-in interlocks can add stiffness to thin-wall housing designs. 整合性收縮翹曲分析 Integrated Shrinkage and Warpage Analysis 總收縮變形 Process Induced Shrinkage and Warpage (Total Shrinkage and Warpage) 不均勻收縮 non-uniform shrinkage 不均衡冷卻 unbalanced cooling 不均勻收縮 Non-Uniform Shrinkage 檢查充填系統 Check Filling System 模穴厚度和形狀、澆口數目和位置 、流道尺寸和配置 以及 融膠溫度 、射壓和充 填時間 Cavity thickness shape, gate number location, runner size layout and melt temperature, pressure fill time 流長壁厚比是否降低？/ Shall flow length/thickness ratio smaller ? 流動是否更平衡？ Can flow be more balanced ? 壓力分佈 原始設計( ) Pressure ( Original ) Max entrance pressure : 50.6 MPa Clamp force : 165.6 ton 翹曲變形結果 原始設計( ) Shrinkage Warpage ( Original ) 壓力分佈 修正設計( ) Pressure ( Revised ) Max entrance pressure : 43.8 MPa Clamp force : 111.6 ton 分析效益結論 Benefits Summary 找出變形的主要因素:不平衡冷卻或不均勻收縮 Ë不均勻收縮 Find out the major cause of warpage: unbalance