Prevention of Exit Crack in Mirco-drilling of Soda-lime Glass

유리의 미세구멍 가공시 출구 크랙 발생 방지

  • 박병진 (서울대 대학원 기계항공공학부) ;
  • 최영준 (서울대 대학원 기계항공공학부) ;
  • 주종남 (서울대 기계항공공학부)
  • Published : 2001.04.01

Abstract

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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