C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 9/22 (2006.01) C21D 1/10 (2006.01) C21D 1/42 (2006.01)
Patent
CA 2483374
The present invention relates to a threaded rock drill product (12) for percussive rock drilling having an external hardened thread. The thread comprises thread crests and thread bottoms comprising a hardening zone (22) having increased hardness. A first hardened area (25) is defined in a radial cross-section comprising a thread crest (24) and a second hardened area (26) is defined in a radial cross-section comprising a thread bottom (23). Said product has a center line (CL). The hardening zone (22) follows a curve (C), which is convex at the first hardened area (25). The hardening zone (22) follows a curve (C), which is concave at the second hardened area (26).
La présente invention concerne un élément (12) de forage de roche fileté utilisé dans le forage de roche par percussion, et présentant un filet externe renforcé. Le filet comprend des sommets et des bas de filet avec une zone (22) de renforcement plus rigide. Une première zone renforcée (25) est définie dans une section trasversale radiale comprenant un sommet (24) de filet, et une seconde zone renforcée (26) est définie dans une section transversale radiale comprenant un bas (23) de filet. Ledit élément présente une ligne centrale (CL). La zone (22) de renforcement suit une courbe (C) qui est convexe au niveau de la première zone renforcée (25). La zone (22) de renforcement suit une courbe (C) qui est concave au niveau de la seconde zone renforcée (26).
Hagelin Goeran
Hedlund Ann-Cathrin
Lundquist Agne
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
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