Small-shank tool for automatic lathes

Details Small-shank tool for automatic lathes Small-shank tool for automatic lathes

B - Operations, Transporting

23

B

B23B 27/16 (2006.01) B23B 29/04 (2006.01) B23B 29/20 (2006.01)

Patent

CA 2251610

A small-shank cutting tool (10), the tool shank (14) defining a square cross section having a width (A) of either 7 mm or 8 mm, and a tool recess (16) at one end of the shank (14). A rhomboidal-shaped insert (12) is seated within the recess (16), a substantial portion of two sides (28, 30) of the insert (12) extending beyond the end of the shank (14) and forming a cutting tip (32) for cutting a workpiece. The insert (12) defines an inscribed circle (IC) having a diameter less than approximately 6 mm, and a fastener aperture (34) extending through the approximate center of the inscribed circle (IC) defining a diameter (E) less than that of the inscribed circle (IC). A threaded fastener (36) fixedly attaches the insert (12) to the shank (14). The fastener (36) is preferably a counter-sunk torque screw, and defines a maximum head diameter (E) less than approximately 70 % of the diameter of the inscribed circle (IC) in order to maintain sufficient structural integrity of the insert (12).

L'invention concerne un outil de coupe (10) à petite queue. La queue de l'outil (14) définit une section carrée d'une largeur (A) de 7 ou 8 mm, et un évidement de réception d'outil (16) à une extrémité. Une plaquette amovible rhombique (12) est logée dans l'évidement de réception (16), une partie substantielle des deux côtés (28, 30) de la plaquette amovible (12) s'étendant au-delà de l'extrémité de la queue (14) et formant une pointe coupante (32) pour couper une pièce à usiner. La plaquette amovible (12) définit un cercle inscrit (CI) ayant un diamètre (E) inférieur à celui dudit cercle (CI). Une attache filetée (36) permet de monter de manière fixe la plaquette amovible (12) à la queue (14). L'attache (36) est de préférence une vis de torsion à tête fraisée et définit un diamètre de tête maximum (E) inférieur à environ 70 % de celui du cercle inscrit (CI) de sorte que l'intégrité structurelle de la plaquette amovible (12) soit suffisante.

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