Enter the mold constant, volume of the casting, surface area of the casting, and Chvorinov’s Rule constant into the calculator to determine the solidification time.

Chvorinov’s Rule Formula

The following formula is used to calculate the solidification time according to Chvorinov’s Rule.

T = B * (V/A)^n

Variables:

• T is the solidification time (seconds)
• B is the mold constant (seconds/cm^2)
• V is the volume of the casting (cm^3)
• A is the surface area of the casting (cm^2)
• n is the Chvorinov’s Rule constant, typically 2

To calculate the solidification time, divide the volume of the casting by its surface area, then raise the result to the power of the Chvorinov’s Rule constant. Multiply this result by the mold constant. The result is the estimated solidification time.

What is Chvorinov’s Rule?

Chvorinov’s Rule is a principle in casting that states the solidification time of a cast is proportional to the square of the volume-to-surface area ratio. This rule is used to predict the cooling time of a casting, which is crucial in determining the quality of the final product. The rule suggests that a larger casting or one with a more complex shape will take longer to cool and solidify.

How to Calculate Chvorinov’s Rule?

The following steps outline how to calculate the solidification time using Chvorinov’s Rule.

1. First, determine the mold constant (B) in seconds/cm^2.
2. Next, determine the volume of the casting (V) in cm^3.
3. Next, determine the surface area of the casting (A) in cm^2.
4. Next, determine the Chvorinov’s Rule constant (n).
5. Finally, use the formula T = B * (V/A)^n to calculate the solidification time (T) in seconds.

Example Problem:

Use the following variables as an example problem to test your knowledge.

mold constant (B) = 0.5 seconds/cm^2

volume of the casting (V) = 100 cm^3

surface area of the casting (A) = 50 cm^2

Chvorinov’s Rule constant (n) = 2