Cutting tool

Claim 2

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece by relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge substantially at the radially outer edge fo said rake face, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer noncutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portion, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, said arbor having a plurality of circumferentially spaced recesses around the periphery thereof, wear resistant inserts secured in said recesses, said cutting edges and said guide portions being fOrmed on the radially outer ends of said inserts, each insert having a leading end and a trailing end with a radially inwardly extending recess therebetween, the cutting edges being formed on the leading ends of each insert and the guide portions being formed on the trailing end of each insert, said recess defining said groove.

Claim 3

A rotary cutting tool as called for in claim 1 wherein each guide portion comprises a cylindrical land struck about the axis of the arbor.

Claim 4

A rotary cutting tool as called for in claim 1 wherein each guide portion comprises a radially outermost sharp edge on the guide member defined by the intersection of two generally flat surfaces.

Claim 5

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece and relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge substantially at the radially outer edge of said rake face, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer noncutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portion, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, and a sleeve telescopically mounted on said arbor adjacent the leading end thereof, said cutting edges and guide portions being located around the outer periphery of said sleeve, the telescopically engaged portions of the sleeve and arbor having axially tapered surface portions which are interengaged so that when the sleeve and arbor are telescopically engaged and the sleeve is displaced axially in one direction relative to the arbor the sleeve is expanded and the radial dimensions of said cutting edges and guide portions are increased.

Claim 6

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece and relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge substantially at the radially outer edge of said rake face, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer noncutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portion, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, and a sleeve telescopically mounted on said arbor adjacent the leading end thereof, said cutting edges and guide portions being located around the outer periphery of said sleeve, the telescopically engaged portions of the sleeve and arbor having axially tapered surface portions which are interengaged so that when the sleeve and arbor are telescopically engaged and the sleeve is displaced axially in one direction relative to the arbor the sleeve is expanded and the radial dimensions of said cutting edges and guide portions are increased.

Claim 7

A rotary cutting tool as called for in claim 4 wherein said axially tapered surface portions of the arbor and sleeve are radially aligned with said cutting edges and guide portions.

Claim 8

A rotary cutting tool as called for in claim 4 wherein said axially tapered surface portions of said arbor and sleeve are radially aligned with said cutting edges and are circumferentially off set relative to said guide portions.

Claim 9

A rotary cutting tool as called for in claim 6 wherein the portions of said arbor and sleeve radially aligned with said guide surfaces are spaced apart radially.

Claim 10

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece and relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge substantially at the radially outer edGe of said rake face, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer noncutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portions, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, said arbor having a plurality of circumferentially spaced recesses around the periphery thereof, wear resistant inserts secured in said recesses, said cutting edges and said guide portions being formed on the radially outer ends of said inserts, each insert being shaped as a regular polygon, said cutting edges and guide portions being formed around the outer periphery thereof and means indexably supporting the inserts in said recesses.

Claim 11

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece and relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge substantially at the radially outer edGe of said rake face, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer noncutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portions, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, said arbor having a plurality of circumferentially spaced recesses around the periphery thereof, wear resistant inserts secured in said recesses, said cutting edges and said guide portions being formed on the radially outer ends of said inserts, each insert being shaped as a regular polygon, said cutting edges and guide portions being formed around the outer periphery thereof and means indexably supporting the inserts in said recesses.

Claim 12

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece and relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge starting substantially at the radially outer edge of said rake face, said front rake face intersecting the clearance face in a sharp cutting, edge, said clearance face receding radially inwardly substantially directly from said cutting edge, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer non-cutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portion, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, each guide portion comprising a radially outermost sharp edge on the guide member defined by the intersection of two generally inclined flat faces.

Claim 13

A rotary cutting tool, such as a reamer or boring tool, for machining the inner cylindrical surface of a hole in a workpiece by relatively rotating the tool and workpiece and relatively advancing the tool axially into the hole, said tool having an arbor provided with a plurality of teeth spaced circumferentially around the axis of the arbor and extending to the leading end thereof, said teeth having cutting edges which extend axially of the tool at the periphery thereof and which also extend radially of the tool at the leading end thereof, each of said axially extending cutting edges being defined by a front rake face and a radially outer clearance face, said clearance face being backed off radially inwardly at its leading edge starting substantially at the radially outer edge of said rake face, said front rake face intersecting the clearance face in a sharp cutting, edge, said clearance face receding radially inwardly substantially directly from said cutting edge, at least a plurality of said cutting edges having guide members associated therewith, said guide members each having a radially outer non-cutting guide portion spaced radially from the axis of the tool substantially the same distance as said cutting edges, said guide portions being spaced circumferentially behind their respective cutting edges, there being a radially inwardly extending groove between each cutting edge and its respective guide portion, said guide portions extending axially of the tool and terminating adjacent the leading end of the tool short of said radial cutting edges a distance no greater than about 0.050 inch, each guide portion comprising a radially outermost sharp edge on the guide member defined by the intersection of two generally inclined flat faces.