CUTTING TOOL Russian patent published in 2007 - IPC B23B27/16 

FIELD: metal working processes and equipment, built-up cutting tools.

SUBSTANCE: cutting tool includes holder and cutting tip having first through opening and mounted in seat of holder. Said seat has lower wall and at least one lateral wall. Second opening of holder passes downwards from lower wall; third opening of holder passes backwards from second opening and it opens to fourth opening of holder inclined by first inclination angle relative to third opening. Fastening stud arranged in second opening protrudes upwards to first through opening and it has upper portion and lower portion with front and back sides, dent passing backwards from upper portion. Lower portion of fastening stud has recess open backwards and arranged along axis of third opening. Front end of said recess is arranged significantly nearer to front side of lower portion than to its rear side. Pusher is placed in third opening; its front part protrudes forward into second opening and engages with front part of said recess; its back portion protrudes backwards to fourth opening and it has first pressure surface arranged across first axis of pusher. Fastening member is placed in fourth opening and it has second pressure surface for engaging with first pressure surface. In first position on cutting tool designed for placing cutting tip in seat, dent of fastening stud is arranged with gap before (in front of fastening portion) turned back part of through opening of cutting tip. In second position on cutting tool designed for securing cutting tip to seat, fastening member is arranged at applying effort through second pressure surface to first pressure surface of pusher for forcing its front part forward to front part of recess of fastening stud. First contact point on upper part of lower portion of fastening stud engages with front part of second opening. Dent of fastening stud forces (downwards and backwards) fastening part of turned back part of through opening of cutting tip for guaranteed forcing of cutting tip in seat to lower wall and at least to one lateral wall of seat.

EFFECT: improved reliability of fastening cutting tip due to its guaranteed forcing to lower and lateral walls of seat.

22 cl, 6 dwg