Drill bit having a replaceable cutting head

Details Drill bit having a replaceable cutting head Drill bit having a replaceable cutting head

B - Operations, Transporting

23

B

B23B 51/02 (2006.01)

Patent

CA 2379637

The invention relates to a drill bit comprising a drill bit shaft (1), a cutting insert (2) which is detachably fixed thereto and which forms the tip area of the drill bit, and comprises a flute (3) that continues into the cutting insert (2). Said cutting insert rests, with a bearing surface (6) extending orthogonal to the center longitudinal axis (8) of the drill bit, on the face (7) of the drill bit shaft (1) and extends with a fixing stud (9), which centrally protrudes from the bearing surface (6), into a receiving recess (10) which is configured complementary thereto and which is provided in the face (7) of the drill bit shaft (1). At least one peripheral section (13) of the fixing stud (9) comprises a first longitudinal section (15) that, with a screw surface (16) which points away from the drill bit shaft (1), which slopes upward to the drill bit tip (5) in a direction of rotation of the drill bit, and which interacts with an opposite surface (19) on the inner wall (14) of the receiving recess (10), merges into a second longitudinal section (17).

L'invention concerne un foret comportant une tige (1) et une plaquette de coupe (2) formant la zone pointue du foret et fixée sur la tige de manière amovible, ainsi qu'une goujure (3) qui se prolonge dans la plaquette de coupe (2). Cette plaquette de coupe s'appuie par une face d'appui (6) qui s'étend à angle droit par rapport à l'axe longitudinal médian (8) du foret sur la face de contact (7) de la tige (1). Il est également prévu un tourillon de fixation (9) qui fait saillie de manière centrée hors de la face d'appui (6) et une cavité de réception (10) conçue de manière complémentaire audit tourillon, dans la face de contact (7) de la tige (1). Au moins une section périphérique (13) du tourillon de fixation (9) comporte une première section longitudinale (15) qui se transforme en une seconde section longitudinale (17) par une surface hélicoïdale (16) qui est dirigée en sens opposé à la tige (1), monte dans le sens de rotation du foret (18) en direction de la pointe dudit foret (5) et coopère avec une surface antagoniste (19) sur la paroi intérieure (14) de la cavité de réception (10).

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