| 摘要 |
PURPOSE: A cutting tool for trimming punched holes in an aluminum extruding material for a building exterior is provided to rapidly trim punched holes using multiple cutting blades and chip breakers. CONSTITUTION: A cutting tool for trimming punched holes in an aluminum extruding material for a building exterior comprises a hemispheric ball(100), a body(200), and a coupling unit(300). The hemispheric ball trims the inner surface of a circular hole(11) produced by the surface of an aluminum extruding material(10). The body is extended from one side of the outer surface of the ball and has multiple blades(210) and chip breakers(220). The coupling unit is assembled with a drill chuck.
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