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【正文】 Tooling Ejector Mechanisms Factors Effecting Ejection Force ?Sidewall Draft ?Sidewall Contact Area ?Sidewall Polish/Texturing ?Degree of Packing ?Mold Temperature ?Mold Release Tooling Ejector Mechanisms TEXTURING AND DRAFT ANGLE Tooling Texture and Draft Angle DRAFT ANGLE DRAFT ANGLE 1/2o MIN Tooling Texture and Draft Angle Additional 1 Degree per Mil in Depth of Texture Draft Angle for Textured Sidewall Tooling Texture and Draft Angle ? Quality of Texture Varies with Type of Steel ? Identical Grades of Steel Can Etch Differently Texturing Guidelines Tooling Texture and Draft Angle ? Enhances Styling and Aesthetics ? Reduces Rejects Texturing Mold Finishes Tooling Texture and Draft Angle CORE PULLS Tooling Core Pulls Hydraulic Core Pulls Plastic Core Pin Cored Hole Core Hydraulic Cylinder Cavity Tooling Core Pulls Tooling Core Pulls Tooling Core Pulls Tooling Core Pulls PROTOTYPING Tooling Prototyping Prototype Tool Materials Aluminum Beryllium Alloys Mild Steel P20 Steel Thermal Conductivity (BTU/hr ft oF) 95 65 26 21 2 Aluminum Thermal Conductivity Is Times That of P20 Steel Tooling Prototyping ?Parts Cool More Quickly in Aluminum Tooling ?Parts Shrink Less in Aluminum Tooling Shrink Is Different in Steel and Aluminum Tooling Prototyping Choose Prototype Tool Materials After Consideration of : Dimensional Criteria of Part Surface Finish Required Wear Resistance Tooling Prototyping ?Part Design Dictates Performance ?Performance Dictates Material Tooling Summary Plastic Part Production Material Dictates Tooling ?Mold Types ?Mold Materials ?Sprue Bushings ?Runners ?Gates ?Venting ?Ejectors ?Draft Angle ?Mold Finishes ?Temperature Control ?Prototyping ?Shrinkage Tooling Summary Mold Design GOOD PART Tooling Considerations GE Plastics EJECTOR MECHANISMS DESIGN 80 to 100 In Sidewall Contact PIN DIAMETER 1/8 1/4 3/8? REQUIRES PIN BEARING SURFACE 1 in2 1 in2 1 in2 1 In Pin Bearing Surface NUMBER OF PINS 82 20 9 2 2 Tooling Ejector Mechanisms INTERNAL THREAD SNAP LID COMMON UNDERCUTS Tooling Ejector Mechanisms Detail on Side External Thread COMMON UNDERCUTS Tooling Ejector Mechanisms Latch or Hook Bobbin or Spool COMMON UNDERCUTS Tooling Ejector Mechanisms 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 RO
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