Chvorinov Solidification Time Calculator
SI
Imp
Imperial
Inputs
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Casting volume
(V_c)
Net casting volume. Internal chills, cores and feeders should be handled by your foundry method, not hidden here.
cm³
Casting cooling area
(A_c)
Effective heat-transfer surface area for the casting section being screened.
mm²
Riser volume
(V_r)
Trial riser volume for a relative solidification-time check.
cm³
Riser cooling area
(A_r)
Effective riser cooling area. Exclude insulated or contact areas according to your foundry method.
mm²
Mold constant (cm basis)
(B)
Empirical Chvorinov constant for the alloy, mold material, superheat and process. The modulus is evaluated in cm even when dimensions are entered in imperial units.
s/cm^n
Exponent
(n)
Chvorinov exponent, commonly close to 2 for first-pass casting screens.
Target riser time ratio
(R_t)
Desired riser solidification time divided by casting solidification time.
Results
Default result
Edit inputs
Riser time ratio
(t_r/t_c)
2.37
Pass
Also computed
Casting modulus
(M_c)
12.50
mm
Casting time
(t_c)
3.13
min
Riser modulus
(M_r)
19.23
mm
Riser time
(t_r)
7.40
min
Required riser modulus
(M_req)
13.98
mm
Riser modulus margin
(M_r - M_req)
5.26
mm
Method notes
3 notes
Uses casting modulus M = V/A and Chvorinov time t = B * M^n with M evaluated in cm.
Riser comparison assumes the same empirical B and exponent for the casting section and trial riser.
This is a formula-only foundry screen. Feeding distance, shrinkage, chills, gates, riser necks, alloy behavior, mold practice and simulation/production trials still control final casting design.
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