CO<sub>2</sub> Laser Beam Drilling of Thin-Walled Spheroidal Graphite Cast Iron

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  • 薄肉球状黒鉛鋳鉄のCO<sub>2</sub>レーザビーム穴あけ加工
  • 薄肉球状黒鉛鋳鉄のCO2レーザビーム穴あけ加工
  • ウスニク キュウジョウ コクエン チュウテツ ノ CO2 レーザ ビーム アナ

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Abstract

  CO2 laser beam was applied to the drilling of thin-walled spheroidal graphite cast iron. The average drilled diameter was investigated by changing the functions of laser power, irradiation time, gas pressure and the type of assist gases used. The smallest average drilled diameter obtained was 0.31mm under the conditions as the laser power of 400W, irradiation time of 0.5s, gas pressure of 0.5kPa and assist gas oxygen. A heat-affected zone was always generated. This heat-affected zone was then heat treated also with CO2 laser beam. The martensitic structure (800HV0.1) of the heat affecetd zone completely transformed into pearlite. A hardness of 300HV0.1 could be obtained under the conditions ; 700W, 0.5s, and 0.5kPa of assist gas oxygen. These results show that CO2 laser beam drilling and subsequent heat treatment should serve as a new drilling process of spheroidal graphite cast iron, which reduces physical labor and improves working conditions in foundry industries.

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