Twist drill

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 51/02 (2006.01)

Patent

CA 2556663

A twist drill (1), in particular for machining wrought aluminium alloys, has a drill shaft (2) and a cutting part (3) that extends to a drill point (6), spiral chucking grooves (4) extending along the cutting part (3), forming a drill core (15), the thickness (D k) of the core at the drill point (6) being equal to (15 ~ 3) % of the drill diameter (D), the drill diameter (D) and/or core thickness (D k) diminishing from the drill point (6) to the shaft (2), the twist drill having a primary clearance angle ($g(a)1) equal to (19 ~ 3)° and a secondary clearance angle ($g(a)2) equal to (26 ~ 4)°.

Ce foret hélicoïdal (1), utile notamment pour usiner des alliages corroyés d'aluminium, comprend une tige (2) et une partie coupante (3) qui s'étend jusqu'à une pointe de foret (6), des goujures hélicoïdales (4) s'étendant le long de la partie coupante (3), formant un mandrin de foret (15), l'épaisseur (D¿k?) du mandrin à la pointe (6) du foret étant égale à (15 .plusmn. 3) % du diamètre (D) du foret, le diamètre (D) du foret et/ou l'épaisseur (D¿k?) du mandrin diminuant de la pointe (6) du foret vers la tige (2), l'angle primaire de dépouille (.alpha.¿1?) étant égal à .alpha.¿1? = (19 .plusmn. 3)· et l'angle secondaire de dépouille (.alpha.¿2?) étant égal à .alpha. = (26 .plusmn. 4)·.

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