| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for hardening a cast crude material in which strains hard to be generated.SOLUTION: Provided is a method for hardening a cast crude material including a whole cooling step (S3) and a partial cooling step (S4). In the whole cooling step (S3), a mist-shaped refrigerant is jetted to the whole of a cast crude material (W) to cool the cast crude material (W). In the partial cooling step (S4), the mist-shaped refrigerant is jetted to the respective parts (W1a to W1m, W2a to d) of the cast crude material (W) in accordance with the strain pattern of the cast crude material (W) to cool the cast crude material (W).SELECTED DRAWING: Figure 5 |
