| 摘要 |
PURPOSE:To finish a piercing with good efficiency and to reduce a working cost by specifying the material of a casting article and performing a piercing with punching by specifying the thickness. CONSTITUTION:A hole is made by punching the fitting holes 3a, 3b at the part in <=10mm thickness of the casting article composed of a spherical graphite cast iron FCD 37-60. A good punched hole is formed without causing a crack, etc., at the other part. The process is thus simplified, a man-hour is reduced, a working cost is reduced and a piercing is performed at the specified position of a casting article with good efficiency.
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