Question

The objection with the use of ------------- is a tendency for producing a fountain effect in the casting.

• A. Ring gate
• B. Horn gate
• C. Pencil gate
• D. Top gate

Hint:

Avoid horn gates when aiming for defect-free castings in applications sensitive to turbulence. Prefer gating systems that allow smooth, laminar metal flow into the mold cavity.

Answer 1

The Correct Option is B

A horn gate is a type of vertical gating system used in casting. One major disadvantage of the horn gate is the fountain effect it can produce when molten metal enters the mold cavity. This effect results from the vertical momentum of the metal, which can cause turbulence and entrain air or slag into the casting, leading to defects like blowholes or inclusions. Other gate types like ring gate, pencil gate, or top gate are either more controlled in terms of flow or serve different gating arrangements that avoid such turbulent entry conditions.