METHOD AND DEVICE FOR MODIFYING MICRO PORE DEFECT

摘要

PROBLEM TO BE SOLVED: To improve yield by modifying a micro pore defect occurring in a micro pore work piece. SOLUTION: In modifying a micro pore defect simply having through diameter smaller than a normal hole existing in a round through hole formed in the micro pore work piece, a needle-like file 26 having a needle-like file part 26A is prepared, the tip of the needle-like file part 26A of the needle-like file 26 is faced to the micro pore defect, the center of the micro pore defect is matched with the axial center of the needle-like file 26, and then the needle-like file 26 is progressed while being rotated until a target diameter part equal to the through diameter of the normal hole of the file part 26A matches to the through part of the micro pore defect.