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塑料注射成型工艺基础

塑料注射成型工艺基础. 内容提要. 注射工艺过程 注射压力 填充模式 浇注系统与流道平衡 冷却系统 应力、收缩与翘曲 常见的注塑缺陷 CAE 软件应用指南. Co-injection molding. Fusible core injection molding. Gas-assisted injection molding. Injection-compression molding. Lamellar (microlayer) injection molding. Live-feed injection molding.

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塑料注射成型工艺基础

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  1. 塑料注射成型工艺基础

  2. 内容提要 • 注射工艺过程 • 注射压力 • 填充模式 • 浇注系统与流道平衡 • 冷却系统 • 应力、收缩与翘曲 • 常见的注塑缺陷 • CAE软件应用指南

  3. Co-injection molding

  4. Fusible core injection molding

  5. Gas-assisted injection molding

  6. Injection-compression molding

  7. Lamellar (microlayer) injection molding

  8. Live-feed injection molding

  9. Low-pressure injection molding

  10. Push-pull injection molding

  11. Structural foam injection molding

  12. Process cycle

  13. Importance of process conditions

  14. Generic Name Melt Temperature (C/F) Mold Temperature (C/F) Min. Rec. Max. Min. Rec. Max. ABS 200/392  230/446  280/536  25/77  50/122  80/176  PA 6 230/446  255/491  300/572  70/158  85/185  110/230  PC 260/500  305/581  340/644  70/158  95/203  120/248  PET 265/509  270/518  290/554  80/176  100/212  120/248  PMMA 240/464  250/482  280/536  35/90  60/140  80/176  POM 180/356  225/437  235/455  50/122  70/158  105/221  PP 200/392  230/446  280/536  20/68  50/122  80/176  PS 180/356  230/446  280/536  20/68  50/122  70/158  PVC 160/320  190/374  220/428  20/68  40/104  70/158  SAN 200/392  230/446  270/518  40/104  60/140  80/176  Resin data table

  15. Temperature-time curve at various locations in the mold

  16. Screw positions at various stages

  17. Cycle time and its components

  18. Required mold opening

  19. Determination of the gate/part freezing time

  20. Pressure decreases along the delivery system and the cavity

  21. Factors influencing injection pressure requirements (I)

  22. Factors influencing injection pressure requirements (II)

  23. Factors influencing injection pressure requirements (III)

  24. Factors influencing injection pressure requirements (IV)

  25. Injection pressure as a function

  26. Melt front advancements

  27. Melt-front velocity and melt-front area

  28. Fiber orientations

  29. Variation of MFA

  30. Basic runner system layouts

  31. Commonly used runner cross sections

  32. Equivalent hydraulic diameters

  33. Runner diameter chart

  34. Effect of runner length

  35. Hot runner system types

  36. Filling patterns resulting from various injection rates

  37. Cold slug

  38. A family-mold part with artificially balanced runners

  39. FIGURE 1. Gate size terminology Gate size terminology

  40. Gate types （I） Direct (sprue) gate Tab gateEdge (standard) gate Overlap gateFan gateDisk (diaphragm) gate

  41. Gate types （II） Ring gateSpoke (spider) gateFilm (flash) gate

  42. Mold cooling accounts for more than two-thirds of the total cycle time

  43. Proper and efficient cooling improves part quality and productivity

  44. A typical cooling system for an injection molding machine

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