Self-boring screw

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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Details

F16B 25/10 (2006.01)

Patent

CA 2704891

What is described is a self-boring screw (2) comprising a bore section (6) attached to the free end of the screw shaft (4), two vanes (12) radially protruding from said bore section, the border of said vanes facing toward the bore tip (8) of the bore section (6) being configured as a boring blade (13). The bore section (6) comprises a chip discharge zone (14) that is configured such that the border of the vanes (12) facing toward the bore tip (8) forms a cutting point (S) with a bore radius (16), said cutting point having a distance (A) to the screw shaft (4) that is at least 2/3 of the cutting edge length of the bore tip (8). The chip discharge zone (14) makes it possible that the chips produced by the boring bla-de (10) at the bore tip (8) can be discharged freely and without buildup. The ma-terial cut by the boring blade (10) is conveyed as chipped material away from the bore tip (8) in the direction of the cutting point (S) at a lower vane connection (15) as a result of the rotational motion of the screw (2), thus ensuring unhinde-red chip discharge. It is possible to compress the chips to be discharged to a ma-ximum of 2/3 of the cross section occurring after the cut. This ensures that even critically sized chips are removed without blocking the discharge of chips from the area of the bore section (6).

L'invention concerne une vis autoforeuse (2) comprenant une partie foreuse (6) qui est réalisée à l'extrémité libre du corps de vis (4) et de laquelle font saillie radialement deux ailettes (12) dont la délimitation orientée vers la pointe de forage (8) de la partie foreuse (6) est réalisée en tant qu'arête de forage (13). La partie foreuse (6) comprend une zone d'évacuation des copeaux (14), la délimitation des ailettes (12) orientée vers la pointe de forage (8) formant avec le rayon de forage (16) un point d'intersection (S) qui présente par rapport au corps de vis (4) au moins une distance (A) qui correspond à 2/3 de la longueur d'arête de coupe de la pointe de forage (8). La zone d'évacuation des copeaux (14) permet d'évacuer sans entrave ni accumulation les copeaux produits par l'arête de forage (10) au niveau de la pointe de forage (8). Pendant le forage, le matériau coupé par l'arête de forage (10) est transporté, sous forme de copeaux, de la pointe de forage (8) vers le point d'intersection (S) sur un raccord d'ailette inférieur par le mouvement de rotation de la vis (2) et l'écoulement libre des copeaux est ainsi assuré. Une compression des copeaux à évacuer à 2/3 au maximum de la section transversale produite après la coupe est possible. On garantit ainsi que même des copeaux de taille critique peuvent être évacués de la zone de la partie foreuse (6) sans bloquer l'écoulement des copeaux.

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