Riser:
- A riser or feeder head is a passage of sand made in the cope (mold) during ramming the cope.
- The molten metal rises in the feeder head (or riser) after the mold cavity is filled up.
- This metal in the feeder head (or riser) compensate the shrinkage as the casting solidifies.
Function of riser:
a) The primary function of the riser (attached with the mold) is to feed metal to the solidifying casting so that shrinkage cavity is get rid of.
b) A riser permits the escape of air and mold gases as the mold cavity is being filled with the molten metal.
c) A riser full of molten metal indicates that the mold cavity has already been completely filled up with the same.
d) A casting solidifying under the liquid metal pressure of the riser is comparatively sound.
e) Riser promotes directional solidification.
Types of riser:
a) Open riser
b) Blind riser
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