Importance

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Abstract

A drilling method capable of preventing hole clogging easily and at low cost is provided. A drilling method of the disclosure includes: a hole forming step in which a surface of a workpiece is drilled to form at least one penetration hole from the surface to a back surface of the workpiece; a liquid intrusion step in which the workpiece is immersed in a tank containing a liquid, and the inside of the tank is decompressed to a predetermined pressure to allow the liquid to intrude into the penetration holes; a liquid solidification step in which the liquid that has intruded into the penetration holes is solidified after the workpiece is taken out of the tank; and a burr removing step in which the surface of the workpiece is blasted to remove burrs formed around openings of the penetration holes.

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First Claim