| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve machining accuracy and tool life by suppressing vibration acting on a broach body 1 during machining, and to correct a minute change of an outside shape and size of a cutting edge part 4. SOLUTION: A hollow part 6 is formed inside the rod shape broach body 1 having the cutting edge part 4 on the outer periphery thereof. The hollow part 6 is filled with liquid or viscous substance P and sealed. In addition, an exothermic body 8 and a thermoelectric element are inserted into the hollow part 6.</p> |
