| 摘要 |
PROBLEM TO BE SOLVED: To prevent a possibility in which cooling water flows out into a cooling hole of a die upon completion of an air purging and enable a temperature control over the die to be carried out in a strict manner. SOLUTION: There is provided a die cooling apparatus comprised of a fluid merging part 4 for merging a cooling water supplying passage 2 for supplying cooling water into a cooling hole A1 punched at a die A with an air purging passage 3 for feeding high pressure air to purge with air the cooling water in the cooling hole so as to cool the die by alternatively supplying the cooling water and air into the cooling hole through the fluid merging part. Check valves 4a, 4b for keeping each of cooling water and air of lower pressure than a cracking pressure in the cooling water supplying passage and air purging passage are assembled into the fluid merging part 4. After the cooling water is discharged out of the cooling water supplying passage 2 through the fluid merging part 4, high pressure air is discharged out of the air-purging passage 3 through the fluid merging part with a certain time lag.
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