Title:
Cutting insertion
Document Type and Number:
Japanese Patent JP6186335
Kind Code:
B2
Abstract:
During grooving or cutting-off, chips are curled into a flat spiral spring shape with no lateral displacement, cut to an appropriate curl length, and then discharged, irrespective of their thickness that varies according to the amount of feed. Inclined surfaces 51 and 52 are formed on a rake face 40 such that they incline downward toward a central portion between side cutting edges 120, and a recessed groove 60 is formed in the central portion between the inclined surfaces such that the recessed groove 60 extends from the the end cutting edge 110 in the forward-rearward direction. The groove width of the recessed groove 60 gradually increases from the position of the end cutting edge 110 toward the rear, then gradually decreases such that the recessed groove 60 has a narrowest portion at a position P2 forward of the position P3 of an upper end 45 of a breaker wall 43 and rearward of a positive rake angle rear end position P1, and then gradually increases toward the rear up to the position P3 of the upper end 45 of the breaker wall 43. The dimensional relation W1 < W2 < W3 holds, where W1 is the groove width at the end cutting edge 110, W2 is the groove width at the narrowest portion, and W3 is the groove width at the position P3 of the upper end 45 of the breaker wall 43.
Inventors:
Ando Giju
Minoru Koide
Takashi Fujimoto
Minoru Koide
Takashi Fujimoto
Application Number:
JP2014219067A
Publication Date:
August 23, 2017
Filing Date:
October 28, 2014
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
B23B27/22; B23B27/04; B23B27/14
Domestic Patent References:
| JP201099815A | ||||
| JP2008272924A |
Foreign References:
| WO2011149091A1 | ||||
| WO2012043629A1 | ||||
| WO2011093333A1 |
Attorney, Agent or Firm:
Kazuhisa Kato