Rebuildable hard surface cutting tip for mining bit
AssigneeBit Service Company LTD
InventorsScott BAHR, Ian CHESHUK
Life of this patent
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Abstract
A replaceable bit for use in radial mining equipment and methods for manufacturing and rebuilding the bit, the bit having a body, the body having a retention portion and an ore face engagement portion, the ore face engagement portion having an ore-facing surface, where the ore-facing surface is provided with hard surfacing.
Claims20
A replaceable bit for use in radial mining equipment, the bit comprising:
- a forged and through-hardened body, the body comprising a retention portion and an ore face engagement portion, the ore face engagement portion having an ore-facing surface;
- and
- a non-embedded cutting surface applied on the ore-facing surface after forging and through-hardening of the body;
- wherein the cutting surface is composed of hard surfacing that is first shaped to form a profiled surface, and then sharpened to form a sharpened cutting surface.
A method for manufacturing a bit for use in radial mining equipment, the method comprising the steps of:
- a. providing steel;
- b. forging the steel into a bit body;
- c. after the forging, through hardening the bit body;
- d. after the through hardening, applying hard surfacing to a cutting tip of the bit body;
- e. after the applying, shaping the hard surfacing to form a non-embedded cutting surface on the cutting tip;
- and
- f. after the shaping, sharpening the hard surfacing to form a sharpened cutting surface.
A method for rebuilding a bit for use in radial mining equipment, the bit comprising a forged and through-hardened body, the body comprising an ore face engagement portion, the ore face engagement portion having an ore-facing surface, a non-embedded cutting surface applied on the ore-facing surface after forging and through-hardening of the body, the cutting surface composed of hard surfacing, wherein at least a portion of the cutting surface has worn away, the method comprising the steps of:
- a. where the ore face engagement portion has partially worn away, adding material to the ore face engagement portion to restore gage length and reforming the ore-facing surface;
- b. after the reforming of the ore-facing surface, applying new hard surfacing to the ore-facing surface;
- c. shaping the new hard surfacing to form a profiled surfacing;
- and
- d. sharpening the profiled surfacing to form a new cutting surface.
Dependencies are inferred from the claim text.