模具基础知识讲解(二)---浇注系统设计

(62页)

'模具基础知识讲解(二)---浇注系统设计'
模具设计的优先順序 Priorities of Mold Design浇注系統设计 (Filling System Design)排氣系统设计(Venting System Design)冷卻系統设计 (Cooling System Design)脫模系統设计 (Ejecting System Design) 万学超 2007.8.1 浇注系统的优先順序Priorities of Filling System Design 产品设计 (Part Design) 型腔设计 (Cavity Design) 浇口设计 (Gate Design) 流道设计 (Runner Design) 噴嘴设计 (Nozzle Design) 典型的浇注系統Typical Filling System 直浇道 Sprue浇口 成品Gate Part 主流道 Main Runner 冷料井 Cold Slug Well 支流道 Branch Runner 壁厚不均 Non-uniform Wall Thickness壁厚不均是注塑成型中最大的麻烦制造者。 这对薄壁产品尤然。 这些麻烦包括了迟滯現象、短射、凹陷、发赤、噴流、翘曲及长冷卻时间等;目前都可用CAE以直接或间接的方式預測。Non-uniform wall thickness is the biggest trouble maker in plastic injection molding. This is especially true to thin-wall part. The troubles, including hesitation, short shot, sink mark, blush, jetting, warpage and long cooling time etc., can be predicted, directly or indirectly, by using CAE. 壁厚设变Wall Thickness Design 差 [Poor] 较好 [Better] 最好 [Best] 掏空掏空 (1) Coring Out Design (1)原设计 [Original] 改进设计 [Improved] 掏空设计 (2) Coring Out Design (2) 差 [Poor] 改进 [Improved] 氣泡或和凹陷的形成Void or/and Sink Mark Forming 氣泡 ( Void ) 凹陷 ( Sink Mark ) 肋厚和內圆角半径的影响The Effect of Rib Thickness & Fillet Radius 肋的底部厚度Bottom Thickness of Rib(A) (B) W1.5WD 1.2WD 2.5W 0.5W W 肋的设计 (1 ) Rib Design ( 1 ) A C t B D E F At = wall thichness D = 2 BB = 0.5t E = 0.13 mm(radius)C = 3 t F = 1.5 - 2 deg假如需要更大的強度,可增加肋的数目If more strength is required, add additional ribs. 肋的设计 (2)Rib Design ( 2 )肋的设计 (3)Rib Design ( 3 )与側壁相连之凸辕 (热塑性塑料) Boss at Wall ( Thermoplastics ) L A = 凸辕附著处壁厚 H wall thickness B = 凸辕外环直径 A' dia. of boss over radii C = 0.5 A D = 2 B A' E = 1 ~ 2 deg F = 0.13 mm ( radius ) K E G = D H = 0.8 A J I = A / 4 D I G F J = 2 B A K = 0.3 ~ 1 J C L = 0.5 A B Section A'-A' 远离側壁之凸辕 (热塑性塑料)Boss Away From Wall ( Thermoplastics ) A =凸辕附著处壁厚 wall thickness I B =凸辕外环直径 (含底部修整圆弧半径) dia. of boss over radii C = 0.5 A D = 2 B E H E = 1 - 2 deg F = 0.13 mm ( radius ) G F D F G = 0.95 D A H = 0.3 G min. to G max. C I = 0.5 A B 外側凸辕 Outside Boss A ( DIA )A' A' B = A B= 2A ( max. ) B Section A'-A' 挠曲刚性 Flexural Rigidity 1 M ? r EIWhere 1/r : 梁的曲率 curvature of the beamM : 弯曲力矩 bending momentE : 弹性模数 modulus of elasticityI : 断面积对中立轴的惯性矩 moment of inertia of the cross- sectional area with respect to the neutral axisEI : 挠曲刚性 flexural rigidity各种一体成型的內锁件能增加薄辕的刚性。 A variety of molded-in interlocks can add stiffness to thin-wall housing designs. 结构设计和薄辕成型产品Structural Design & Thi
关 键 词:
模具基础知识讲解(二)---浇注系统设计 ppt、pptx格式 免费阅读 下载 天天文库
 天天文库所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
关于本文
本文标题:模具基础知识讲解(二)---浇注系统设计
链接地址: https://www.wenku365.com/p-44788648.html
关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服点击这里,给天天文库发消息,QQ:1290478887 - 联系我们

本站为“文档C2C交易模式”,即用户上传的文档直接卖给(下载)用户,本站只是中间服务平台,本站所有文档下载所得的收益归上传人(含作者)所有【成交的100%(原创)】。本站是网络服务平台方,若您的权利被侵害,侵权客服QQ:1290478887 欢迎举报。

1290478887@qq.com 2017-2027 https://www.wenku365.com 网站版权所有

粤ICP备19057495号 

收起
展开