模具冷卻設(shè)計(jì)目

1、模具冷卻設(shè)計(jì)目薄殼產(chǎn)品不像傳統(tǒng)壁厚者一般可以承受較大的因熱傳不均而產(chǎn)生的殘餘應(yīng)力。 為了將收縮彎翹控制在可以接受的程度，均衡的冷卻設(shè)計(jì)變得非常重要。Thin-wall part can not afford as much thermal induced residual stress as the conventional one does. An even cooling design becomes very important to control the shrinkage and warpage at an acceptable level.Cooling DesignCoolin

2、g Design射出成型週期時(shí)間射出成型週期時(shí)間Injection Molding Cycle TimeInjection Molding Cycle Time充填時(shí)間Fill Time開模時(shí)間Open Time後充填時(shí)間Post-fill Time對(duì)冰箱蔬果盤之類的大零件而言，材料往往佔(zhàn)成本50%以上。 對(duì)小而薄的零件而言， 成形機(jī)費(fèi)用可佔(zhàn)成本的90% ，材料6% ，而模具只佔(zhàn)4%。 小而薄的產(chǎn)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

3、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 constitutes 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(shè)計(jì)冷卻設(shè)計(jì)Cooling

4、 DesignCooling Design典型的冷卻系統(tǒng)典型的冷卻系統(tǒng)Typical Cooling SystemTypical Cooling System模溫調(diào)節(jié)機(jī)Temperature controlling unit軟管Hoses冷卻迴路 2Cooling Circuit 2冷卻迴路 1Cooling Circuit 1泵Pump收集歧管Collection manifold供給歧管Supply manifold模具冷卻管路模具冷卻管路 Mold SchematicMold Schematic冷卻孔道冷卻孔道Cooling ChannelsCooling Channels入口入口Inl

5、et出口出口Outlet入口入口Inlet出口出口Outlet噴泉管噴泉管BubblerBubbler障板管障板管BaffleBaffle熱管熱管Heat PipeHeat Pipe蒸發(fā)部位熱輸入蒸發(fā)部位熱輸入Heat In凝結(jié)部位熱輸出凝結(jié)部位熱輸出Heat Out液體液體Liquid蒸汽蒸汽Vapor燈心燈心 ( 毛細(xì)管毛細(xì)管 )Wick ( Capillary )熱管的應(yīng)用熱管的應(yīng)用The Application Of Heat PipeThe Application Of Heat Pipe理論上最短冷卻時(shí)間理論上最短冷卻時(shí)間Min. Possible Cooling TimeMin.

6、 Possible Cooling Time理論上最短冷卻時(shí)間the min. possible cooling time產(chǎn)品最大厚度the max. part thickness熔膠的熱擴(kuò)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(shí)間和厚度分佈冷卻時(shí)間和厚度分佈Cooling Time and Thickness ProfileCooling Time and Thickness Profile差的設(shè)計(jì)差的設(shè)計(jì)Bad Design好的設(shè)計(jì)好的設(shè)計(jì)Good

7、Design冷卻孔道直徑、深度和節(jié)距建議值冷卻孔道直徑、深度和節(jié)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(jié)距為3D至5D Pitch, 3D to 5D原始設(shè)計(jì)原始設(shè)計(jì)Original DesignOriginal Design修正設(shè)計(jì)修正設(shè)計(jì)Revised DesignRevised DesignA

8、ASEC. A-A原始設(shè)計(jì)原始設(shè)計(jì)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(shè)計(jì)修正設(shè)計(jì)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(shè)計(jì)原始設(shè)計(jì)Original DesignOriginal D

9、esign公模嵌塊core insertO型環(huán)O-ring空氣囊air pocket 修正設(shè)計(jì)修正設(shè)計(jì) (1) (1)Revised Design ( 1 )Revised Design ( 1 )公模嵌塊core insertO型環(huán)O-ring修正設(shè)計(jì)修正設(shè)計(jì) (2) (2)Revised Design ( 2 )Revised Design ( 2 )公模嵌塊core insertO型環(huán)O-ring不平衡的設(shè)計(jì)不平衡的設(shè)計(jì)Unbalanced DesignUnbalanced Design平衡的設(shè)計(jì)平衡的設(shè)計(jì)Balanced DesignBalanced Design不用限流孔梢的內(nèi)歧管設(shè)

10、計(jì)不用限流孔梢的內(nèi)歧管設(shè)計(jì)Internal Manifold Design without FropsInternal Manifold Design without Frops使用限流孔梢的內(nèi)歧管設(shè)計(jì)使用限流孔梢的內(nèi)歧管設(shè)計(jì)Internal Manifold Design Utilizing FropsInternal Manifold Design Utilizing Frops限流孔梢限流孔梢Flow Resistance Orifice PinFlow Resistance Orifice Pin紊流和層流紊流和層流Turbulent and Laminar FlowsTurbulen

11、t and Laminar Flows紊流Turbulent Flow層流Laminar Flow雷諾數(shù)雷諾數(shù)Reynolds NumberReynolds Number雷諾數(shù)(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(duì)雷諾數(shù)對(duì)雷諾數(shù)(Re)(Re)Nusselt Number Vs. Reynolds NumberNusselt Number Vs. Reynolds Number層流Laminar紊流Turbulent差的設(shè)計(jì)差的設(shè)計(jì)Poor Des