Bit for a drill tool

Details Bit for a drill tool Bit for a drill tool

B - Operations, Transporting

23

B

B23B 51/02 (2006.01)

Patent

CA 2661450

The aim of the invention is to obtain a good system for removing chips from a drill tool (2). To this end, the bit (10) of the drill tool comprises a cutting region which is divided into three cutting sections, a central cutting section (16b) forming an inactive cutting section which borders an inner cutting corner (18) on an active cutting section (16a) close to the centre. The distance (R1) of the inner cutting corner (18) from the central axis (4) of the drill bit is somewhat larger than a core radius (R4) of the core (23) of a drill bit, and the inactive cutting section (16b) is therefore moved back in the radial direction approximately opposite the inner cutting corner (18). In this way, during operation, the chips removed are split into two groups parts (28a, 28b), thereby obtaining a reliable chip removal system.

En vue d'obtenir un bon enlèvement de copeaux dans un outil de perçage (2), sa pointe (10) présente une zone de coupe subdivisée en trois sections de coupe (16a, b, c), une section de coupe intermédiaire (16b) formant une section de coupe inactive qui, en un coin intérieur (18), est adjacente à une section de coupe active (16a) voisine du centre. La distance (R1) du coin de coupe intérieur (18) par rapport à l'axe médian du foret (4) est légèrement plus grande qu'un rayon (R4) d'un noyau central (23) du foret. La section de coupe inactive (16b) s'en trouve déplacée vers l'arrière, en direction radiale, sensiblement par rapport au coin de coupe intérieur (18). Il s'ensuit que lors du perçage, le copeau enlevé se casse en deux parties (28a, 28b) avec, en conséquence, un enlèvement plus fiable dudit copeau.

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