| 摘要 |
PROBLEM TO BE SOLVED: To provide a broaching tool having cutting force twice of ordinary broaching which solves the problem wherein a service life of the tool is shortened by increase of cutting quantity in a straight nick part even in case of restricting the maximum cutting quantity relatively small when necessary, in the broaching tool to be used for machining a circular or arch spine hole, and round hole of a highly hard material having 45-65 HRC of hardness. SOLUTION: This broaching tool is provided with carbide blades 1, 3 and 5 having nearly straight nicks 16, 17, 30, 31, 32 and 33. Continuously to these blades, cutting blades 2, 4 and 6 having the same forms 15, 22 and 23 as the cutting blades arranged right before and formed into a round or a circular shape are provided to cut a nearly straight nick part left as it is not cut by the cutting blade arranged right before. Each of the cutting blades, which are respectively provided with the nearly straight nick, and the cutting blade provided following thereto are formed into a pair, and pairs of these cutting blades are arranged in order of dimension. Cutting quantity w of each of the cutting blades is set to the same. COPYRIGHT: (C)2005,JPO&NCIPI
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