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US 12,226,861 B1Granted
Constant rake fluted drill bit and method of manufacture
OwnerJeffrey Bonnerinventor
Life of this patent
Estimating the term…
Abstract
A constant rake planar cutting edge fluted drill bit and a method of manufacturing the same. The drill bit includes a planar cutting face formed at the tip end of the bit by a motion of a rotating machining wheel respective to a stationary blank in a first step. Once the cutting face is formed, the blank is rotated and translated in a direction parallel to an elongated axis, during which the rotating machining wheel creates a flute. Upon completion of the first flute, the bit is rotated accordingly and the processes are repeated to create each subsequent planar cutting face and respective flute. The process can also be completed in a slightly modified version of a reverse process, fabricating a flute prior to formation of the planar cutting face of the bit.
Claims24
A method of fabricating a drill bit, the method comprising steps of:
- (a) securing a drill bit blank stock in a machine;
- (b) initiating a rotation of a machining wheel;
- (c) a drawing together motion bringing at least one of the rotating machining wheel and the drill bit blank stock towards the other of the rotating machining wheel and the drill bit blank stock at a location proximate a drill bit shank section of the drill bit blank stock, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
- (d) initiating a linear motion and a rotational motion of the drill bit blank stock to cut a helical flute when the rotating machining wheel is prior to or at a depth of cut of the helical flute, wherein the linear motion and the rotational motion are performed simultaneously during the process of cutting the helical flute;
- (e) removing material from the drill bit blank stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear and rotational motion to create the helical flute from a shank sided end of a cylindrical helical flute section to a free end of the cylindrical helical flute section, wherein step (e) transitions the drill bit blank stock into a partially completed drill bit,
- (f) ceasing the rotational motion of the partially completed drill bit when a distal radial edge of the rotating machining wheel reaches a position proximate a leading end of the partially completed drill bit,
- (g) ceasing the linear motion of the partially completed drill bit and radially separating the rotating machining wheel and the partially completed drill bit from one another, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the partially completed drill bit and in a direction opposite to the drawing together motion, wherein step (g) transitions the partially completed drill bit into a formed drill bit;
- wherein step (g) creates a flat rake surface, wherein the flat rake surface extends axially between the free end of the cylindrical helical flute section created in step (e) and the leading end of the partially completed drill bit, the flat rake surface extending radially outward from a crease of the helical flute to a circumferential surface of the partially completed drill bit.
5 more elements
A method of fabricating a drill bit, the method comprising steps of:
- (a) securing a drill bit blank stock in a machine;
- (b) initiating a rotation of a machining wheel;
- (c) a drawing together motion bringing at least one of the rotating machining wheel and the drill bit blank stock towards the other of the rotating machining wheel and the drill bit blank stock at a location proximate a drill bit shank section of the drill bit blank stock, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
- (d) initiating a linear motion and a rotational motion of the drill bit blank stock to cut a helical flute when the rotating machining wheel is prior to or at a depth of cut of the helical flute, wherein the linear motion and the rotational motion are performed simultaneously during the process of cutting the helical flute;
- (d) initiating a linear motion and a rotational motion of the drill bit blank stock to cut a helical flute when the rotating machining wheel is prior to or at a depth of cut of the helical flute wherein the linear motion and the rotational motion are performed simultaneously during the process of cutting the helical flute;
- (e) removing material from the drill bit blank stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear and rotational motion to create the helical flute from a shank sided end of a cylindrical helical flute section to a free end of the cylindrical helical flute section, wherein step (e) transitions the drill bit blank stock into a partially completed drill bit,
- (f) ceasing the rotational motion of the partially completed drill bit when a distal radial edge of the rotating machining wheel reaches a position proximate a leading end of the partially completed drill bit,
- (g) ceasing the linear motion of the partially completed drill bit and radially separating the rotating machining wheel and the partially completed drill bit from one another, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the partially completed drill bit and in a direction opposite to the drawing together motion, wherein step (g) transitions the partially completed drill bit into a formed drill bit;
- wherein step (g) creates a flat rake surface, wherein the flat rake surface extends axially between the free end of the cylindrical helical flute section created in step (e) and the leading end of the partially completed drill bit, the flat rake surface extending radially outward from a crease of the helical flute to a circumferential surface of the partially completed drill bit,
- wherein the machining wheel is one of:
- a grinding wheel, or
- a cutting wheel.
9 more elements
A method of fabricating a drill bit, the method comprising steps of:
- (a) securing a drill bit blank stock in a machine;
- (b) initiating a rotation of a machining wheel;
- (c) a drawing together motion bringing at least one of the rotating machining wheel and the drill bit blank stock towards the other of the rotating machining wheel and the drill bit blank stock at a location proximate a drill bit shank section of the drill bit blank stock, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
- (d) initiating a linear and a rotational motion of the drill bit blank stock to cut a helical flute when the rotating machining wheel is prior to or at a depth of cut of the helical flute, wherein the linear motion and the rotational motion are performed simultaneously during the process of cutting the helical flute;
- (e) removing material from the drill bit blank stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear and rotational motion to create the helical flute from a shank sided end of a cylindrical helical flute section to a free end of the cylindrical helical flute section, wherein step (e) transitions the drill bit blank stock into a partially completed drill bit,
- (f) ceasing the rotational motion of the partially completed drill bit when a distal radial edge of the rotating machining wheel reaches a position proximate a leading end of the partially completed drill bit,
- (g) ceasing the linear motion of the partially completed drill bit and radially separating the rotating machining wheel and the partially completed drill bit from one another, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the partially completed drill bit and in a direction opposite to the drawing together motion, wherein step (g) transitions the partially completed drill bit into a formed drill bit;
- wherein step (g) creates a flat rake surface, wherein the flat rake surface extends axially between the free end of the cylindrical helical flute section created in step (e) and the leading end of the partially completed drill bit, the flat rake surface extending radially outward from a crease of the helical flute to a circumferential surface of the partially completed drill bit,
- wherein the machining wheel includes one of:
- a leading side radial machining surface and a linear chamfered circumferential machining surface intersect along a first edge therebetween and a trailing side radial machining surface and the linear chamfered circumferential machining surface intersect along a second edge therebetween, wherein a diameter of the first edge is smaller than a diameter of the second edge, wherein the trailing side radial machining surface creates the flat rake surface,
- a leading side radial machining surface and a convex chamfered circumferential machining surface intersect along a first edge (therebetween and a trailing side radial machining surface and the linear chamfered circumferential machining surface intersect along a second edge therebetween, wherein the trailing side radial machining surface creates the flat rake surface, or
- a leading side radial machining surface and a leading circumferential machining surface of a V-shaped circumferential surface intersect along a first edge of the chamfered circumferential surface, a trailing side radial machining surface of the V-shaped circumferential surface and a trailing side radial machining surface intersect along a second edge therebetween, leading circumferential machining surface of the V-shaped circumferential surface and the trailing side radial machining surface the V-shaped circumferential surface intersect along a central edge therebetween wherein a diameter of the central edge is larger than each of a diameter of the first outer edge of the V-shaped circumferential surface and a diameter of the second edge of the V-shaped circumferential surface, wherein the trailing side radial machining surface creates the flat rake surface.
9 more elements
Dependencies are inferred from the claim text.