Summary of Functions of Plastic Injection Mold Components

1. Sprue Bushing -Directly contacts the injection nozzle of the molding machine; molten plastic must pass through the sprue bushing before entering the mold core.

2. Locating Ring - Used on the mold to align it with the injection molding machine easily.

3. Plate - Together with the base plate, supports the entire mold set.

4. Ejector Protection Switch - Prevents the mold from closing if the ejector plate has not fully retracted, protecting the mold from damage.

5. Ejector Rod Hole - Allows the ejector rod to push the ejector plate forward, thus ejecting the product.

6. Sprue Puller - Used during mold opening to pull the sprue plate away, making it easier to remove the sprue.

7. Guide Pillar (also known as Guide Pin) - Guides the mold halves together accurately during mold closing (typically 4 pieces).

8. Cooling Channel Interface - Maintains the mold at a constant temperature during production, ensuring product stability.

9. Angled Guide Pin - During mold opening, if the spring does not function, the angled guide pin moves the slider backward.

10. Wedge Block - Pushes the slider forward during mold closing and is fixed on the front mold (the mating surface between the wedge block and slider is an inclined plane).

11. Slider - Installed on the rear mold.

12. Slider Shim - Increases the wear resistance of the slider (used when the product has undercuts).

13. Return Pin - Guides the ejector plate during ejection and ensures proper retraction after mold closure.

14. Core Pin - Fixed on the base plate; remains stationary while the ejector plate moves.

15. Sleeve - Used when the product has ring-shaped ribs that are deep and difficult to demold; acts as an ejector.

16. Angled Ejector - Ejects the product along an angle during demolding.

17. Sleeve (Ejector Sleeve) - Similar to an ejector pin but used for products with a fine hole in the center.

18. Core Pin - Used for forming holes in the product and works in conjunction with the sleeve, not for ejection purposes.

19. Support Column - Supports the B-plate against deformation due to injection pressure.

20. Trash Pin - Supports the ejector plate and prevents debris accumulation, which could cause unevenness or deformation.

21. Cooling Water Channel - Ensures effective cooling of the mold, maintaining temperature within a specified range.

22. Water Nozzle - Connects the mold's cooling channels to the injection machine’s cooling system.

23. Runner Puller - Helps separate the runner from the mold during opening.

Sprue Puller - Aids in separating the main sprue from the injection machine nozzle.

24. Slider - Performs side core pulling, working with guide slots and moved by angled guide pins.

25. Slide Slot - Used for side core pulling, especially for products with protrusions or recesses on the sides.

26. Spring - Provides return functionality.

27. Small Pull Rod - Functions similarly to larger pull rods, providing limit positioning.

28. Limit Pin - Limits the movement of the ejector plate.

29. Vent - Removes air and gases from the mold during injection.

30. Positioning Steel Ball - Used primarily to stop the slider.

31. Lifting Eye - Used for lifting the mold.

32. Intermediate Support - Installed on the ejector plate to guide the ejection system.

33. Resin Valve Gate - Increases resistance between the fixed and moving molds to ensure the runner plate opens first.

34. Insulation Board - Prevents heat from the mold from transferring to the injection machine.

35. Insert - Saves material, reduces mold complexity.

•Bone heights exceeding 8mm may require inserts for easier polishing and venting.

36. Screw Pull Rod - Fixes the top clamping plate and stripper plate during mold opening.

37. Sprue Puller Plate - Secures the sprue puller.

38. Front and Rear Mold Inserts - Secure the runner plate and mold cores.

39. Sprue Puller Pin - Pulls the sprue.

40. Rear Mold Core Pin Sleeve - Primarily used for forming cup-shaped parts of the product.

41. Ejector Pin - Ejects the molded part from the mold.

42. External Pull Rod - Opens the cavity and limits its opening distance.

43. Flat Ejector Pin - Used for ejecting ribs or long, narrow sections where round ejector pins cannot be placed.

44. Electrode - Used to create complex shapes via EDM (Electrical Discharge Machining).

45. Pillow Position - Forms part of the local shape of the product.

46. Locking Block - Aligns the front and rear mold cores.

47. Insert Pin - Part of the localized molding area.

48. Supported Insert Pin - Used for ejecting products with holes less than 2mm.

49. Wedge Block - Installed opposite the slider and behind the angled guide pin.

50. Locking Block -Prevents the mold from opening during handling, transport, and installation.