塑胶材料射出成型介绍.ppt

模溫控制 流道設計 射出成形模具設計 流道設計 流道設計 全圓型 優 流道設計 流道設計 流道設計 流道設計 流道設計 無澆道設計 無澆道設計 澆口設計 澆口設計 澆口設計 澆口設計 澆口設計 澆口設計 澆口設計 澆口設計 澆口設計 澆口設計 Tooling Mold Types Tooling Mold Types Tooling Mold Types Tooling Mold Types Tooling Mold Types Tooling Mold Types Injection Molding Tooling Injection Molding Tooling Tooling Mold Types Tooling Mold Types Tooling Mold Types Tooling Mold Types Tooling Mold Types Tooling Mold Types Basic Geometry Reinforcements Basic Geometry Reinforcements Basic Geometry Reinforcements Basic Geometry Processing Concerns Basic Geometry Wall Thickness Uneven Shrinkage Defects Basic Geometry Wall Thickness Wall Design Basic Geometry Wall Thickness Wall Transitions 模具排氣 模具排氣 模具排氣 離模角度設計 離模角度設計 Gas Burn Gas Burn is a Degradation of the Part Caused by the Compression and Ignition of Trapped Air or Gasses in the Mold. Gas Burn Improper Clamp Tonnage Clogged Air Vents Lack of Adequate Venting Injection Speed Too High Injection Pressure Too High Melt Temperature Too High Mold Temperature Too High Delamination The Separation by Layer Caused by Contamination of a Dissimilar Polymer. 工程塑膠成形應用注意事項 瞭解塑料規格特性 . 確實注意預備烘乾重要性 . 使用提供之制程條件範圍 . 依照塑料特性選用周邊設備 . 依照塑料特性製造模具 . 使用適當之流道設計 . 使用正確的排氣系統 . 使用正確的噴嘴溫度控制 . 使用適當之螺桿設計 . 確實執行保養維護工作 . Boss Redesign D 2D W T R = .25 T H = 2 to 5T t = .5 to .7T to prevent sink marks Gating Wall Transitions Uncompensated Shrinkage Leads to: Warpage Uniform Shrinkage Voids Gating so that melt flows from thick to thin sections reduces uncompensated shrinkage. Voids Already Cooled Surface Will Not Yield to Shrinking Interior Sink Marks Surface Yields to the Still Shrinking Interior Mass Core Thick Sections Gradual Transitions h h h 3h Poor Good Best 排氣系統 加工空隙 0.05mm 頂出梢部份 分模面部份 深度 0.03-0.06mm 料口 排風孔 1.5mm Min. Note Step 1.27mm 1.3mmMin. 頂出機構 Blade at Deep Ribs Rounds Pins Sleeve Ejector Boss Eject Mold Pin Stationary Parts Stripper Plate Stationary Force Knock Out Bars GOOD KNOCK OUT FOR ROUND PARTS USED AROUND PINS BOSSES 頂出機構 頂出影響因素 :