Drill Tool and Method for Producing Same
AssigneeFurukawa Rock Drill Co., Ltd.
InventorsYoshimi Matsumoto, Genki Fusato
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Abstract
A drill tool capable of coping with a rock drill having high output power and a method for producing the drill tool are described. The drill tool is produced by employing, as a drill tool material, an alloy steel composed of the following chemical components: 0.22 to 0.26 wt % of C, 0.15 to 0.35 wt % of Si, 0.55 to 0.80 wt % of Mn, 2.60 to 3.00 wt % of Ni, 1.00 to 1.50 wt % of Cr, 0.20 to 0.30 wt % of Mo, and Fe and inevitable impurities as the balance. Heat treatment with quenching is performed after carburizing performed by means of oil cooling with cold oil and a tempering temperature set at 400 to 440° C.
Claims6
A production method for a drill tool, the production method being a method for producing a drill tool used for a rock drill, wherein
- the drill tool is produced by employing, as a material of the drill tool, alloy steel composed of following chemical components:
- 0.22 to 0.26 wt % of C, 0.15 to 0.35 wt % of Si, 0.55 to 0.80 wt % of Mn, 2.60 to 3.00 wt % of Ni, 1.00 to 1.50 wt % of Cr, 0.20 to 0.30 wt % of Mo, and Fe and inevitable impurities as the balance and, when carburizing-quenching and tempering are performed on the material as heat treatment, performing quenching after carburizing by means of oil cooling with cold oil and setting a tempering temperature at 400 to 440° C.
A drill tool, wherein
- the drill tool is made of alloy steel the constituent materials of which are composed of following chemical components:
- 0.22 to 0.26 wt % of C, 0.15 to 0.35 wt % of Si, 0.55 to 0.80 wt % of Mn, 2.60 to 3.00 wt % of Ni, 1.00 to 1.50 wt % of Cr, 0.20 to 0.30 wt % of Mo, and Fe and inevitable impurities as the balance, a structural state of the drill tool is troostite, surface hardness and core hardness of the drill tool are 47 to 50 HRC and 41 to 43 HRC, respectively, and, in a bending test (in accordance with JIS Z2248) on a 040 mm×480 mm test piece, the drill tool, although bent 28 to 29.7 mm under a load of 155 KN, is not broken.
A drill tool, wherein
- a rod constituting the drill tool has a hollow cylindrical tube portion and a male threaded portion and a female threaded portion joined to both ends of the tube portion, and
- with respect to only the male threaded portion and the female threaded portion, the rod is made of a material that is alloy steel the constituent materials of which are composed of following chemical components:
- 0.22 to 0.26 wt % of C, 0.15 to 0.35 wt % of Si, 0.55 to 0.80 wt % of Mn, 2.60 to 3.00 wt % of Ni, 1.00 to 1.50 wt % of Cr, 0.20 to 0.30 wt % of Mo, and Fe and inevitable impurities as the balance, the structural state of which is troostite, the surface hardness and core hardness of which are 47 to 50 HRC and 41 to 43 HRC, respectively, and that, in a bending test (in accordance with JIS Z2248) on a 040 mm×480 mm test piece, although bent 28 to 29.7 mm under a load of 155 KN, is not broken.
Dependencies are inferred from the claim text.