Hole cutting tool for chamfering and grooving
AssigneeKennametal Inc.
InventorBruce C. Woodward
Life of this patent
Estimating the term…
Abstract
A hole cutting tool for holemaking, chamfering, grooving, threading and/or O-ring grooving. The tool is a rotary tool for holemaking in a workpiece which includes one or more holemaking inserts about the outermost end of the tool, at least a pair of axially spaced apart chamfering inserts radially sunken into the intermediate portion of the tool, and one or more grooving inserts also radially sunken into the intermediate portion of the tool between the chamfering inserts, all of which provides for holemaking with chamfered entrance and exit edges and/or a slot, groove, or threads within the hole. An additional O-ring grooving insert may be provided to cut an annular groove around the hole on an end face of the workpiece.
Claims22
A rotary tool for holemaking, comprising:
- a holemaking body with a central axis therein, the holemaking body including a cutting region and a shank region, the cutting region extending from the shank region to an end surface opposite thereof with an outer surface extending therebetween, the cutting region further including at least a first and second spiraling flute in the outer surface, the cutting body even further including an annular groove bisecting the outer surface and having a grooving insert affixed within the annular groove, and;
- at least one holemaking insert affixed adjacent to the end surface of the cutting region;
- and
- first and second chamfering inserts, the first chamfering insert affixed within the first flute along a portion of the annular groove nearer the end surface, and the second chamfering insert affixed within the second flute along another portion of the annular groove farther from the end surface than the portion of the annular groove the first chamfering insert is affixed to.
A rotary tool for holemaking, comprising:
- a holemaking body with a central axis therein, the holemaking body including a cutting region and a shank region, the cutting region extending from the shank region to an end surface opposite thereof with an outer surface extending therebetween, the cutting region further including at least a first and second spiraling flute in the outer surface, the cutting body even further including an annular groove bisecting the outer surface, and;
- at least one holemaking insert affixed adjacent to the end surface of the cutting region;
- first and second chamfering inserts, the first chamfering insert affixed within the first flute along a portion of the annular groove nearer the end surface, and the second chamfering insert affixed within the second flute along another portion of the annular groove farther from the end surface than the portion of the annular groove the first chamfering insert is affixed to, and;
- a grooving insert affixed within the annular groove in between the first and second chamfering inserts.
A method of making a hole with chamfered edges, the method comprising:
- advancing a holemaking tool into and through a workpiece thereby defining a hole therein, the holemaking tool including at least one holemaking insert affixed to an end of the tool and at least a pair of chamfering inserts affixed within opposing flutes in the tool;
- without removing the holemaking tool, chamfering at least one of the entrance and exit edges;
- and cutting at least one groove into the workpiece in between the entrance and exit edges using a grooving insert affixed to the tool in between the pair of chamfering inserts.
Dependencies are inferred from the claim text.