Question

When there is no room temperature change, the total shrinkage allowance on a pattern is independent of

• A. pouring temperature of the liquid metal
• B. freezing temperature of the liquid metal
• C. the component size
• D. coefficient of thermal contraction of solidified metal

Answer 1

The correct option is A pouring temperature of the liquid metal

$\text{Shrinkage =}\alpha A(T_f-T_a)$

$\text{Where}$

$\alpha \text{= coefficient of thermal contraction}$

$\text{A = Pattern/mould cross-section area}$

$T_f\text{= Freezing temperature}$

$T_a\text{= Ambient temperature}$

$\text{Solid shrinkage is independent of pouring temperature.}$