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US 12,605,795 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 shank end of a drill bit blank stock in a machine;
- (b) initiating a rotation of a machining wheel;
- (c) 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 leading end of the drill bit blank stock in accordance with a drawing together motion, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
- (d) machining material radially inward from a circumferential surface of the drill bit blank stock to a depth of cut of a crease of a helical flute at the leading end of the drill bit blank stock initiating creation of a flat rake surface, wherein step (d) transitions the drill bit blank stock into a raked drill bit stock;
- (e) initiating a linear motion of the raked drill bit stock;
- (f) initiating a rotational motion of the raked drill bit stock;
- (g) removing material from the raked drill bit stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear motion and the rotational motion to create the helical flute from the leading end to a cylindrical helical flute section to a shank sided end of the cylindrical helical flute section,
- (h) ceasing the linear motion and the rotational motion of the raked drill bit stock when a distal radial edge of the rotating machining wheel reaches a position proximate the shank sided end of the raked and fluted drill bit stock, wherein steps (g) and (h) transition the raked drill bit stock into a raked and fluted drill bit stock;
- and
- (i) separating the machine wheel and the raked and fluted drill bit stock from one another in accordance with a radially separating motion, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the raked and fluted drill bit stock and in a direction opposite to the drawing together motion,
- wherein the flat rake surface extends axially between the leading end of the cylindrical helical flute section created in step (d) and the leading end of the raked and fluted drill bit stock, the flat rake surface extending radially outward from the crease of the helical flute to the circumferential surface of the raked and fluted drill bit stock.
8 more elements
A method of fabricating a drill bit, the method comprising steps of:
- (a) securing a shank end of a drill bit blank stock in a machine;
- (b) initiating a rotation of a machining wheel;
- (c) 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 leading end of the drill bit blank stock in accordance with a drawing together motion, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
- (d) machining material radially inward from a circumferential surface of the drill bit blank stock to a depth of cut of a crease of a helical flute at the leading end of the drill bit blank stock initiating creation of a flat rake surface, wherein step (d) transitions the drill bit blank stock into a raked drill bit stock;
- (e) initiating a linear motion of the raked drill bit stock;
- (f) initiating a rotational motion of the raked drill bit stock;
- (g) removing material from the raked drill bit stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear motion and the rotational motion to create the helical flute from the leading end to of a cylindrical helical flute section to a shank sided end of the cylindrical helical flute section,
- (h) ceasing the linear motion and the rotational motion of the raked drill bit stock when a distal radial edge of the rotating machining wheel reaches a position proximate the shank sided end of the raked and fluted drill bit stock, wherein steps (g) and (h) transition the raked drill bit stock into a raked and fluted drill bit stock;
- and
- (i) separating the machine wheel and the raked and fluted drill bit stock from one another in accordance with a radially separating motion, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the raked and fluted drill bit stock and in a direction opposite to the drawing together motion,
- wherein the flat rake surface extends axially between the leading end of the cylindrical helical flute section created in step (d) and the leading end of the raked and fluted drill bit stock, the flat rake surface extending radially outward from the crease of the helical flute to the circumferential surface of the raked and fluted drill bit stock,
- wherein the machining wheel is one of:
- a grinding wheel, or
- a cutting wheel.
11 more elements
A method of fabricating a drill bit, the method comprising steps of:
- (a) securing a shank end of a drill bit blank stock in a machine;
- (b) initiating a rotation of a machining wheel;
- (c) 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 leading end of the drill bit blank stock in accordance with a drawing together motion, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
- (d) machining material radially inward from a circumferential surface of the drill bit blank stock to a depth of cut of a crease of a helical flute at the leading end of the drill bit blank stock initiating creation of a flat rake surface, wherein step (d) transitions the drill bit blank stock into a raked drill bit stock;
- (e) initiating a linear motion of the raked drill bit stock;
- (f) initiating a rotational motion of the raked drill bit stock;
- (g) removing material from the raked drill bit stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear motion and the rotational motion to create the helical flute from the leading end to of a cylindrical helical flute section to a shank sided end of the cylindrical helical flute section,
- (h) ceasing the linear motion and the rotational motion of the raked drill bit stock when a distal radial edge of the rotating machining wheel reaches a position proximate the shank sided end of the raked and fluted drill bit stock, wherein steps (g) and (h) transition the raked drill bit stock into a raked and fluted drill bit stock;
- and
- (i) separating the machine wheel and the raked and fluted drill bit stock from one another in accordance with a radially separating motion, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the raked and fluted drill bit stock and in a direction opposite to the drawing together motion,
- wherein the flat rake surface extends axially between the leading end of the cylindrical helical flute section created in step (d) and the leading end of the raked and fluted drill bit stock, the flat rake surface extending radially outward from the crease of the helical flute to the circumferential surface of the raked and fluted drill bit stock,
- 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 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.
12 more elements
Dependencies are inferred from the claim text.