A device, a drill member and a method for masking the member...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 8/04 (2006.01) E21B 17/00 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2303332

The present invention relates to a device, a drill member and a method for masking the member at thermo chemical surface treatment. The drill member (1) such as a drill tube or a drill rod, has a substantially elongated basic shape and at least one free end (2) as well as a central channel for flush medium. Hardened portions (4) with a first case depth (d) are provided at least partly at the jacket surface of the member. Not hardened portions are provided at least partly at said free end (2), wherein a transition zone (6) in the longitudinal direction between hardened and not hardened material have a first length (b). The first length (b) of the transition zone (6) is longer than the first case depth (d).

La présente invention concerne un dispositif, un outil de forage et un procédé de masquage de l'outil lors du traitement thermochimique de surface. L'outil de forage (1), tel qu'un tube de forage ou une tige de forage, présente une forme de base sensiblement allongée et au moins une extrémité libre (2), ainsi qu'un passage central destiné à un milieu de rinçage. On a prévu des parties durcies (4) d'une première profondeur de cémentation (d) situées au moins partiellement à la surface gainée de l'outil. On a prévu des parties non durcies situées au moins partiellement à ladite extrémité libre (2), dans laquelle une zone de transition (6) se trouvant dans le sens longitudinal, entre la matière durcie et la matière non durcie, présente une première longueur (b). La première longueur (b) de la zone de transition (6) est plus longue que la première profondeur de cémentation (d).

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