Bore cooling

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It is the term used when a number of individually small holes are bored within the thickness of a part so that water can be passed close to the heated surface. straight holes drilled at an angle through a curved thickness give very effective cooling with little loss in strength of the part.As cooling takes place near the hot surface, thermal stress is greatly reduced.

bore cooling is used in most modern liners to maintain acceptable temperature in the liner at its top flange where the metal thickness is greatest.The small holes angled upwards maintain the velocity of the cooling water.