模具冷卻設計的目的 Purposes of Mold Cooling Design,1. 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 residual 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 Design,射出成型週期時間 Injection Molding Cycle Time,充填時間 Fill Time,對冰箱蔬果盤之類的大零件而言，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 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.,冷卻設計Cooling Design,典型的冷卻系統 Typical Cooling System,模具冷卻管路 Mold Schematic,冷卻孔道 Cooling Channels,噴泉管 Bubbler,障板管 Baffle,熱管 Heat Pipe,熱管的應用 The Application Of Heat Pipe,理論上最短冷卻時間 Min. Possible Cooling Time,冷卻時間和厚度分佈 Cooling Time and Thickness Profile,冷卻孔道直徑、深度和節距建議值 Recommended Diameter, Depth & Pitch,D : 直徑為10至14mm Diameter of Cooling Channel, 10 to 14 mm d : 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 Design,修正設計 Revised Design,原始設計 Original Design,修正設計 Revised Design,原始設計 Original Design,修正設計 (1) Revised Design ( 1 ),修正設計 (2) Revised Design ( 2 ),不平衡的設計 Unbalanced Design,平衡的設計 Balanced Design,不用限流孔梢的內歧管設計 Internal Manifold Design without Frops,使用限流孔梢的內歧管設計 Internal Manifold Design Utilizing Frops,限流孔梢 Flow Resistance Orifice Pin,紊流和層流 Turbulent and Laminar Flows,紊流 Turbulent Flow,層流 Laminar Flow,雷諾數 Reynolds Number,Nu對雷諾數(Re) Nusselt Number Vs. Reynolds Number,差的設計 Poor Design,好的設計 Better Design,差的設計 Poor Design,好的設計 Better Design,差的設計 Poor Design,好的設計 Better Design,冷卻設計原則 Cooling 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.,