Ejector pins

Ejector pins, also known as knockout pins, are used in the engineering industry for injection moulding and die casting. They are one of the most cost-effective methods of removal and used to assist in ejection of the final cast product from a cavity. Occasionally, the force applied by an ejector pin can cause damage to the final product.[1]

Use

Ejector pins are placed into the B-side of an injection mould,[2] or the side in which the final product will remain when the mould is opened, to prevent the final product from adhering to the sides of a mould cavity. The chances of this occurring depend on a number of factors, including the size, shape, depth, and curvature of the mould being used. The resin used to create the final product is also a factor, as some resins are sticker than others, while other resins are softer and require a thicker ejector pin to be used to safely remove the product with as little damage as possible.[3]

Shape & Size

Ejector pins are offered in a variety of shapes, sizes, diameters[4] and designs,[5] including:

Ejector Pins.
Ejector Pins.
Ejector Pins.
Ejector Pins.

References

  1. ↑ Culp, Eric. "Coating protects ejector pins from wear, reduces friction". ETMM. Retrieved 23 June 2015.
  2. ↑ Giuseppe, Perego. "An injection molding apparatus having ejector pins with oriented shaping surfaces for product removal". Retrieved 23 June 2015.
  3. ↑ "What are ejector pins?". Wise Geek. Retrieved 23 June 2015.
  4. ↑ "Ejector Pins" (PDF). HawkMold.com.
  5. ↑ Austin-Morgan, Tom. "Top ten design tips for moulded plastic components". Eureka. Retrieved 23 June 2015.
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