Effective Metal Head for Parting Gate Calculator

Effective Metal Head Formula:

\[ Hp = h - \frac{p^2}{2 \times c} \]

Height of Sprue:

Height of Mould Cavity in Cope:

Total Height of Mould Cavity:

Tolerance:

Effective Metal Head (m):

1. What is Effective Metal Head for Parting Gate?

Definition: The effective metal head is the height of molten metal above the parting gate in a casting system, accounting for the mold geometry.

Purpose: It determines the pressure head available for filling the mold cavity during casting processes.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Hp = h - \frac{p^2}{2 \times c} \]

Where:

\( Hp \) — Effective metal head (meters)
\( h \) — Height of sprue (meters)
\( p \) — Height of mold cavity in cope (meters)
\( c \) — Total height of mold cavity (meters)

Explanation: The formula accounts for the reduction in effective head due to the cope portion of the mold.

3. Importance of Effective Metal Head Calculation

Details: Proper calculation ensures adequate metal pressure for complete mold filling while avoiding excessive turbulence or erosion.

4. Using the Calculator

Tips: Enter all dimensions in meters. The tolerance field (default ±5%) allows for manufacturing variations.

5. Frequently Asked Questions (FAQ)

Q1: What is the parting gate in casting?
A: The parting gate is the entry point where molten metal enters the mold cavity at the parting line between cope and drag.

Q2: Why is effective head different from sprue height?
A: The effective head is reduced by the cope portion of the mold, as metal must rise vertically in this section.

Q3: What's a typical tolerance range?
A: ±5% is common, but this may vary based on casting requirements and process control.

Q4: How does this affect casting quality?
A: Proper head ensures complete filling while minimizing turbulence that can cause defects.

Q5: When would I need to adjust the tolerance?
A: For critical castings requiring tighter control, reduce the tolerance percentage accordingly.