Specification of Aluminum Plunger Tips for Casting
The plunger tip is a critical element of aluminum die casting process or metal casting. Its’ successful operation depends on a number of factors.
The most important factor is its’ efficient interaction with a round, straight, thermally and therefore dimensionally stable shot sleeve.
BENEFIT
- Extreme Stable Casting Injection (Shot Profile)
- Deep Vacuum Injection (Non Aluminum Backflash)
- Less Burry on Biscuit Profile
- Less Fire (Fullsystem Copromec)
PURPOSE
- Prevent alloy from penetrating between the shot sleeve and plunger, prolonging tooling life
- Move smoothly and consistently, with a minimum of lubrication, through the shot sleeve bore increasing casting properties
- Maintain a secure seal with the shot sleeve wall necessary for an effective vacuum to be drawn reducing porosity
FUNCTION
The function of the plunger tip is the extension of the plunger rod, which pushes the molten alloy into the mold.
There are a number of functions that must be satisfied by an effective plunger tip.
- To repeatedly transmit the force of the plunger rod, at high temperature, to the alloy.
- To maintain a seal with the shot sleeve wall during the shot, eliminating flash or blow-by and preventing air from being drawn into the alloy when using a vacuum.
- To remain thermally and therefore dimensionally stable throughout the shot allowing consistent and repeatable shot velocities.
- Since the tip is dimensionally stable, and the gap controllable, steel wear rings can be attached to the plunger tip body to provide a guarantee that the seal is maintained.
