METHOD FOR FORMATION OF OPENING OF SURFACE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provided a method for forming an opening having a square corner in a surface material by a rotating cutting blade. SOLUTION: In a corner site of an opening (4) to be formed in the surface material (5), an edge of a sharp rotating cutting blade (1) is set forth from one surface (51) of the material on the same surface with the other surface (52) so that the corner of the opening can be machined for forming a square shape. COPYRIGHT: (C)2005,JPO&NCIPI