Shrink fit holder and methods of drilling and reaming
AssigneeIndustrial Tooling Corporation Limited
InventorRobert Unsworth
Life of this patent
Estimating the term…
Abstract
A drill has a unitary drill bit and chuck structure that includes a drill bit and a chuck. The chuck encloses a portion of the drill bit and has a thread. A rotatable drive element having a thread engages the thread of the chuck. The chuck is heat shrunk onto the drill bit to form a unitary structure through direct bonding of the chuck with the drill bit.
Claims15
A hand-held assembly for performing drilling or reaming operations on large objects utilized in the aeronautical industry, comprising:
- a hand-held drilling device having a rotatable drive element with a threaded bore;
- a drill bit having a shank portion and a helical cutting surface;
- a chuck having a bore that receives the shank portion of the drill bit and having an external threaded connector portion located thereon that engages the threaded bore of the hand-held drilling device;
- the chuck being heat shrunk onto the shank of the drill bit, thereby forming a unitary structure through direct bonding of the chuck with the drill bit;
- an abrasive material applied to the cutting surface of the drill bit;
- a chamber in the bore of the chuck;
- a coolant passage extending through the threaded connector portion of the hand-held drilling device to the chamber for communicating a coolant from the hand-held drilling device to the chamber;
- and
- a coolant channel on the shank portion of the drill bit and extending from the chamber to the cutting surface for communicating the coolant to the cutting surface.
A hand-held drill for performing drilling or reaming operations on large objects utilized in the aeronautical industry, comprising:
- a unitary drill bit and chuck structure comprising a drill bit having a helical cutting surface coated with an abrasive material and a chuck having a bore enclosing a shank portion of the drill bit and having a connector portion containing an external thread located thereon, the drill bit having a coolant channel extending from the cutting surface to the shank portion within the bore of the chuck;
- a hand-held rotatable drive element having a thread located thereon;
- and
- drive means for rotating said rotatable drive element;
- wherein:
- said connector portion of said chuck is in threaded engagement with the thread of said rotatable drive element;
- the chuck is heat shrunk onto the shank portion of the drill bit, thereby forming the unitary structure through direct bonding of the chuck with the drill bit;
- and
- the chuck has a coolant passage extending from the rotatable drive element through the connector portion to the bore in communication with the coolant channel for communicating a coolant from the rotatable drive element device to the drill bit.
A method of manufacturing a unitary drill bit and chuck structure for use with a hand-held drilling device comprising the steps of:
- providing a drill bit with a shank portion and a helical cutting surface;
- providing a chuck formed from a heat shrinkable material and forming a bore in the chuck;
- heating the chuck to a predetermined temperature;
- introducing the shank portion of the drill bit into the bore of the chuck;
- allowing the chuck to cool so as to heat shrink the chuck into direct bonding contact with the shank portion of the drill bit, thereby producing a unitary drill bit and chuck structure;
- providing an external thread on said chuck adapted to threadedly engage a hand-held drilling device;
- heating the unitary drill bit and chuck structure in order to apply an abrasive material to at least a portion of the cutting surface of the drill bit without damaging the bonding contact between the chuck and the drill bit responsive to the heat;
- and
- coating at least a portion of the cutting surface of the drill bit with the abrasive material.
A hand-held assembly for performing drilling or reaming operations on large objects utilized in the aeronautical industry, comprising:
- a hand-held drilling device having a rotatable drive element with a threaded bore;
- a drill bit;
- a chuck enclosing a portion of the drill bit and having an external thread located thereon to permit attachment of said drill bit and chuck directly to the threaded bore of the hand-held drilling device;
- the chuck being heat shrunk onto the drill bit thereby forming a unitary structure through direct bonding of the chuck with the drill bit;
- and
- an abrasive material applied to the drill bit after the chuck is heat shrunk onto the drill bit.
Dependencies are inferred from the claim text.