• Title/Summary/Keyword: 원추형 크랙

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Prevention of Exit Crack in Mirco-drilling of Soda-lime Glass (유리의 미세구멍 가공시 출구 크랙 발생 방지)

  • 박병진;최영준;주종남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.1052-1055
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    • 2001
  • In micro-drilling of brittle materials including glass, cracks occur at the exit surface. In drilling glass, the main type of crack is cone crack. Cone crack is generated by thrust force acting at the bottom surface of the workpiece. Cone crack size could be reduced by changing cutting conditions, but cone crack still existed. Two methods were proposed to prevent crack formation and perfect hole shapes were obtained. One method is attaching two glass plates with water and the other method is constraining two glass plates. The proposed methods eliminated tensile stress acting on the exit surface of glass and prevented crack propagation.

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