模具冷却设计PPT文件格式下载.ppt

1、模具冷卻設計的目的Purposes of Mold Cooling DesignPurposes of Mold Cooling Design1.均衡冷卻（改良產品品質）Even Cooling（Improve Part Quality）2.有效冷卻（提高生產力）Efficient Cooling（Increase Productivity）薄殼產品不像傳統壁厚者一般可以承受較大的因熱傳不均而產生的殘餘應力。#為了將收縮彎翹控制在可以接受的程度，均衡的冷卻設計變得非常重要。#Thin-wall part can not afford as much thermal induced residu

2、al stress as the conventional one does.An even cooling design becomes very important to control the shrinkage and warpage at an acceptable level.冷卻設計Cooling DesignCooling Design射出成型週期時間Injection Molding Cycle TimeInjection Molding Cycle Time充填時間Fill Time開模時間Open Time後充填時間Post-fill Time對冰箱蔬果盤之類的大零件而言

3、，材料往往佔成本50%以上。#對小而薄的零件而言，成形機費用可佔成本的90%，材料6%，而模具只佔4%。#小而薄的產品較之厚者更能從冷卻的改善而獲得效益。#For larger molded parts,material typically represents more than 50%of the part cost for a refrigerator crisper tray.In the case of a thin-wall small part,the press cost could be 90%of the cost of the part;#material constit

4、utes 6%and the mold only 4%of the cost of each part.Small thin-wall parts typically benefit from improved cooling more than thick parts.冷卻設計Cooling DesignCooling Design典型的冷卻系統Typical Cooling SystemTypical Cooling System模溫調節機Temperature controlling unit軟管Hoses冷卻迴路 2Cooling Circuit 2冷卻迴路 1Cooling Circ

5、uit 1泵Pump收集歧管Collection manifold供給歧管Supply manifold模具冷卻管路 Mold SchematicMold Schematic冷卻孔道Cooling ChannelsCooling Channels入口Inlet出口Outlet入口Inlet出口Outlet噴泉管BubblerBubbler障板管BaffleBaffle熱管Heat PipeHeat Pipe蒸發部位熱輸入Heat In凝結部位熱輸出Heat Out液體Liquid蒸汽Vapor燈心（毛細管）Wick （Capillary）熱管的應用The Application Of Heat

6、 PipeThe Application Of Heat Pipe理論上最短冷卻時間Min.Possible Cooling TimeMin.Possible Cooling Time理論上最短冷卻時間the min.possible cooling time產品最大厚度the max.part thickness熔膠的熱擴散度thermal diffusivity of the melt射出溫度injection temp.冷卻液溫度coolant temp.頂出溫度ejection temp.冷卻時間和厚度分佈Cooling Time and Thickness ProfileCoolin

7、g Time and Thickness Profile差的設計Bad Design好的設計Good Design冷卻孔道直徑、深度和節距建議值Recommended Diameter,Depth&#PitchRecommended Diameter,Depth&#PitchD:#直徑為10至14mm Diameter of Cooling Channel,10 to 14 mmd:#深度為D至3D Depth,D,to 3D P:#節距為3D至5D Pitch,3D to 5D原始設計Original DesignOriginal Design修正設計Revised DesignRevise

8、d DesignAASEC.A-A原始設計Original DesignOriginal Design母模板Cavity Plate澆道襯套Sprue Bushing母模嵌塊Cavity Insert公模嵌塊Core Insert公模板Core Plate承板Support Plate修正設計Revised DesignRevised Design母模板Cavity Plate澆道襯套Sprue Bushing母模嵌塊Cavity Insert公模嵌塊Core Insert公模板Core Plate承板Support Plate原始設計Original DesignOriginal Desig

9、n公模嵌塊core insertO型環O-ring空氣囊air pocket 修正設計（1）（1）Revised Design（1）Revised Design（1）公模嵌塊core insertO型環O-ring修正設計（2）（2）Revised Design（2）Revised Design（2）公模嵌塊core insertO型環O-ring不平衡的設計Unbalanced DesignUnbalanced Design平衡的設計Balanced DesignBalanced Design不用限流孔梢的內歧管設計Internal Manifold Design without Inter

10、nal Manifold Design without FropFrops s使用限流孔梢的內歧管設計Internal Manifold Design UtilizingInternal Manifold Design Utilizing Frop Frops s限流孔梢Flow Resistance Orifice PinFlow Resistance Orifice Pin紊流和層流Turbulent and Laminar FlowsTurbulent and Laminar Flows紊流Turbulent Flow層流Laminar Flow雷諾數Reynolds NumberRey

11、nolds Number雷諾數（無因次）Reynolds number（dimensionless）密度density（g/cm3）直徑diameter（cm）速度velocity（cm/sec）黏度viscosity（poise or dyne-sec/cm2 or g/cm-sec）NuNu對雷諾數（Re）Re）NusseltNusselt Number Vs.Reynolds Number Number Vs.Reynolds Number層流Laminar紊流Turbulent差的設計Poor DesignPoor Design好的設計Better DesignBetter Desig

12、n差的設計Poor DesignPoor Design好的設計Better DesignBetter Design差的設計Poor DesignPoor Design好的設計Better DesignBetter Design冷卻設計原則Cooling Design PrinciplesCooling Design Principles選擇熱擴散係數大的塑料。#Select Plastic Material with large thermal diffusivity.採用薄而均一的製件厚度。#Use a thin and uniform part thickness.在型腔周圍均衡的配置冷卻孔道。#Layout cooling channels around cavities evenly.在熱傳的道路上移除空氣間隙和空氣囊。#Remove air gaps and pockets from heat transfer path.平衡冷卻液流動。#Balance coolant flow.檢查冷卻效率。#Check cooling efficiency.促使冷卻勻稱。#Make cooling evenly.選擇適當設備。#Select appropriate equipment.