| 摘要 |
<p>A tool bit (10) for a tube end squaring tool includes a cutting edge (14) produced by machining or grinding a hook radius (16) in the tool bit stock on the entrance angle side (22) of the cutting edge and an undercut portion (20) within the hook radius just rearwardly of the cutting edge on the work entrance side thereof to cause separation from the hook radius area of metal chips parted from a metal workpiece by the cutting edge to reduce friction and workpiece metal buildup on or adjacent the cutting edge.</p> |
