High performance thread forming screw

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

Patent

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Details

F16B 25/00 (2006.01)

Patent

CA 2646356

A thread forming screw (10) having a minimum surface hardness of HRC 56. The screw (10) can form threads in a workpiece having a surface hardness which exceeds HRC 23. A method of surface hardening a screw (10) includes carbon enriching the screw (10) to at least a 0.48 carbon level, and then quenching the screw (10). Then, the screw (10) is tempered such that the surface hardness does not exceed the core hardness by more than 3 Rockwell C points, and both the surface and core are at a Rockwell C33-C39 hardness. Subsequently, the point (16) is induction hardened, and the screw is quenched again. The screw (10) is again tempered such that the lead threads (18) and the first 3-4 full threads (22, 24) are at a Rockwell C56 minimum hardness, preferably to a depth (26) of at least 0.008 inches, and the core of the fastener (10) is at Rockwell C33-C39 hardness. Finally, a finish is applied.

L'invention concerne une vis autotaraudeuse formant le filet (10) possédant une dureté de surface minimale de HRC 56. Cette vis (10) peut former des filets dans une pièce possédant une dureté de surface qui dépasse HRC 23. L'invention concerne également un procédé permettant de durcir la surface d'une vis (10), consistant à enrichir la vis (10) en carbone jusqu'à obtenir un niveau de carbone de 0,48, puis à soumettre la vis (10) à une trempe. Ensuite, la vis (10) est soumise à un revenu de façon que la dureté de surface ne dépasse pas la dureté de noyau de plus de 3 points de Rockwell C, la surface et le noyau possédant une dureté de Rockwell C33-C39. Le procédé consiste par la suite à soumettre la pointe (16) de la vis à une trempe par induction et à soumettre la vis (10) une nouvelle fois à une trempe. La vis (10) est alors soumise une nouvelle fois à un revenu de façon que les pas (18) et les 3-4 premiers filets complets (22, 24) possèdent une dureté minimale de Rockwell C56, de préférence à une profondeur (26) d'au moins 0,008 pouce, et le noyau de la vis (10) possède une dureté de Rockwell C33-C39. Le procédé consiste ensuite, finalement, à appliquer un produit de finition.

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