Injection_mold_tooling通用公司.ppt

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 ROUND PARTS USED AROUND PINS BOSSES Tooling Ejector Mechanisms EFFECT OF THICKNESS ON SHRINKAGE 0.06 0.125 0.25 2 4 6 8 8 10 12 14 6 0 (VALOX 420) A B B A - Direction of flow - Cross Flow Direction Melt Temp, 500 F ( 260 C) Mold Temp, 150 F (66 C) Pressure 12,500 psi Cycle Time 22 Sec Thickness, Mils Shrinkage, Mils/ Inch Shrinkage, Mils/ Inch O O O O A B GE Plastics Some Other Options e 104 P L TEMPERATURE CONTROL BASIC FOUNTAIN (BUBBLER) See ProcPict and SWProc for other Options. P L TEMPERATURE CONTROL BAFFLE EXTENSION FOR SLENDER CORE GATING PIN GATE/THREE PLATE MOLD RUNNER PARTING LINE GATE PARTING LINE .125- .250” 5 .100 .250” Flow HOT SPRUE GATING Heating Element Should Be fully Extended to Ensure Even Heating 0 GatingLocation Gate Gate Location is strongly influenced by the glass content of the material. End Gating is preferred in glass filled materials to minimize warpage. RUNNERS Balanced Layout Preferred Primary- Full Round or Trapezoidal .375 - 10” Long or Above .312 - 3” to 10” .250 - 3” or Under Secondary - 250 Minimum GE Plastics g Injection Mold Tooling Knit Line Gate Area High Stresses Cosmetics Impact Tooling Gating Knit Line and Gate Area Injection Molding Tooling Valve Gate Shut Off System Bushings are Opened for Injection Injection Molding Tooling Valve Gate Shut Off System A Fills, Bushing A Closes