Method and apparatus for honing an elongate rotary tool
AssigneeKennametal Inc.
InventorWilliam R. Shaffer
Life of this patent
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Abstract
A method of, and apparatus for, treating an elongate rotary tool that presents a sharp cutting edge are described. The method includes the steps of emitting under pressure from a nozzle an abrasive fluid stream comprising an abrasive grit entrained in a fluid; and impinging the abrasive fluid stream against the sharp cutting edge of the elongate rotary tool for a preselected time so as to transform the sharp cutting edge into a relatively uniformly honed edge. The apparatus includes a rotatable fixture that releasably holds the elongate rotary tool. A nozzle that emits under pressure an abrasive steam. The nozzle and the elongate rotary tool are relatively moveable so that the abrasive stream impinges the entire length of the sharp cutting edge.
Claims37
An elongate rotary tool having at least one relatively uniformly honed cutting edge produced by the process comprising the steps of:
- emitting under pressure from at least one nozzle assembly an abrasive fluid stream comprising at least one abrasive entrained in a fluid;
- and
- impinging the at least one abrasive fluid stream against at least one sharp cutting edge of the elongate rotary tool for a preselected time so as to transform the at least one sharp cutting edge into relatively uniformly honed edge.
An elongate rotary tool having at least one nose portion that presents at least one sharp cutting edge and an elongate portion that presents at least one other sharp cutting produced by the process comprising the steps of:
- emitting under pressure from at least nozzle assembly an abrasive fluid stream comprising at least one abrasive entrained in at least one liquid;
- and
- impinging the abrasive fluid stream against the sharp cutting edges of the elongate rotary tool for a preselected time so as to transform the sharp cutting edges into relatively uniformly honed edges.
An elongate rotary drill treated by a conditioning process using a first abrasive fluid stream from a first source, the drill comprising:
- an elongate body having an axially forward nose portion, the nose portion presenting a generally transverse nose cutting edge, and the nose cutting edge presenting a generally uniform edge condition as a result of substantially uniform impingement of the first abrasive fluid stream thereon wherein the first source and the elongate body move relative to each other during the conditioning process;
- and
- the elongate body having a generally cylindrical body portion axially rearward of the nose portion, and the generally cylindrical body portion presenting a generally longitudinal cutting edge.
A honed elongate rotary drill comprising:
- an elongate body having an axially forward nose portion, the nose portion being initially formed by grinding so as to initially present an as-ground sharp nose cutting edge and an as-ground arcuate forward surface having grinding marks therein;
- the nose portion presenting a generally transverse honed nose cutting edge presenting a substantially consistent edge condition free from broken portions as a result of substantially uniform impingement of an abrasive fluid stream on the as-ground sharp nose cutting edge;
- and
- the nose portion further presenting an arcuate forward surface substantially free from grinding marks therein as a result of the impingement of the abrasive fluid stream on the as-ground arcuate surface.
An elongate rotary drill treated by a conditioning process using a first abrasive fluid stream from a first nozzle and a second abrasive fluid stream from a second nozzle, the drill comprising:
- an elongate body having an axially forward nose portion, the nose portion presenting a generally transverse nose cutting edge, and the nose cutting edge presenting a generally uniform edge condition as a result of substantially uniform impingement of the first abrasive fluid stream wherein the first nozzle and the elongate body move relative to each other during the conditioning process;
- and
- the elongate body having a generally cylindrical body portion axially rearward of the nose portion, and the generally cylindrical body portion presenting a generally longitudinal cutting edge, and the generally longitudinal cutting edge presenting a generally uniform edge condition as a result of substantially uniform impingement of the second abrasive fluid stream from the second nozzle wherein the second nozzle and the elongate body move relative to each other during the conditioning process.
Dependencies are inferred from the claim text.