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US 5,152,642 AGranted
Metal injection molded rotary metal cutting tool
AssigneeHextap, Inc.
InventorsRonoulde D. Pitts, Thomas L. Hooey
Life of this patent
Estimating the term…
Abstract
A rotary metal cutting tool for forming threads on the insides of a bore, drilling a bore or otherwise shaping a bore, which tool is fabricated from a metal injection molded blank of appropriate tool steel to provide improved tool wear. The tool, which may be a tap, includes a transverse stress relief ring for reliably localizing the point of tool failure under overstress conditions. A polygonal, e.g., hex, surface on the shank provides means for engaging the shank with an extraction tool to remove the broken remains of the tool from the bore after the tool fails. A conventional O-ring seal is installed in the stress relief ring to provide protection from flying metal particles upon failure.
Claims16
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides approximately 5-10 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- a stress relief ring located between said cutting surfaces and said shank portion;
- extraction surfaces located between said stress relief ring and said cutting surface;
- and
- an O-ring provided in said stress relief ring.
4 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides which are smaller than 20 microns in diameter, said body having a shank portion including means for mounting said body in a tool holder;
- and
- a stress relief ring circumscribing said tool body, said ring comprising a circumferential groove formed as a straight-sided cylinder which at its point of maximum depth encircles a cross-section of said body having a diameter of between one-half and four-tenths of the diameter of said shank portion, whereupon application of excessive torque to said tool fractures said tool along a transverse plane intersecting the walls of said groove.
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides approximately 5-10 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- and
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder.
2 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides approximately 5-10 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder;
- and
- extraction surfaces located between said stress relief ring and said cutting surfaces.
3 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides approximately 5-10 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder;
- extraction surfaces located between said stress relief ring and said cutting surfaces;
- and
- wherein said stress relief ring and extraction surfaces are contained in contiguous sections of said tool body.
4 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides approximately 5-10 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- and
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder which at its point of maximum depth encircles a cross-section of said body having a diameter of between one-half and four-tenths of the diameter of said shank portion, wherein application of excessive torque to said tool fractures said tool along a transverse plane intersecting the walls of said groove.
2 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides less than 20 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool to be gripped by a tool holder;
- and
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder.
2 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides less than 20 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder;
- and
- extraction surfaces located between said stress relief ring and said cutting surfaces.
3 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides less than 20 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder;
- extraction surfaces located between said stress relief ring and said cutting surfaces;
- and
- wherein said stress relief ring and extraction surfaces are contained in contiguous sections of said tool body.
4 more elements
A cutting tool comprising:
- a tool body of tool steel alloy having a microstructure characterized by substantially uniformly distributed carbides less than 20 microns in diameter;
- cutting surfaces adjacent one end of said tool body;
- a shank portion adjacent the other end of said tool body to permit said tool body to be gripped by a tool holder;
- and
- a stress relief ring located between said cutting surfaces and said shank portion, wherein said stress relief ring comprises a groove circumscribing said shank portion, said groove being configured at its deepest portion as a straight-sided cylinder which at its point of maximum depth encircles a cross-section of said body having a diameter of between one-half and four-tenths of the diameter of said shank portion, wherein application of excessive torque to said tool fractures said tool along a transverse plane intersecting the walls of said groove.
2 more elements
Dependencies are inferred from the claim text.