Shrinkage allowance on pattern is provided to compensate for shrinkage when the _____________________?
Correct answer: B. Solid phase temperature drops from freezing temperature to the room temperature
- A. Metal changes from liquid state to solid state at freezing temperature
- B. Solid phase temperature drops from freezing temperature to the room temperature
- C. Liquid metal temperature drops from pouring temperature to room temperature
- D. Liquid metal temperature drops from pouring temperature to freezing temperature
Explanation
Pattern shrinkage allowance mainly compensates for contraction of the solid casting as it cools from its freezing temperature to room temperature. Contraction during liquid-to-solid conversion is handled separately through casting and riser design.
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