| 摘要 |
An indexible carbide cutting tool insert and tool holder therefor providing a plurality of right-angled cutting edges positioned to finish cut journals at a negative back rake angle of 1 DEG to 4 DEG with a negative side rake angle of 1 DEG to 4 DEG and with an end relief angle and side relief angle of not less than 1 DEG . The cutting edges include nose cutting radius portions for contour cutting, finish cutting flats and side cutting portions to provide a single indexible insert with the capability of performing a complete machining operation in the finish turning of bearing journals. Chip-breakers are provided to cooperate with each of the cutting edge portions to prevent the formation of long, continuous chips, which are customarily formed in connection with turning steel at high speeds especially with the use of carbide cutting tools.
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