US20010000223A1 - Cutting tools for drilling concrete, aggregate, masonry or the like materials - Google Patents
Cutting tools for drilling concrete, aggregate, masonry or the like materials Download PDFInfo
- Publication number
- US20010000223A1 US20010000223A1 US09/727,026 US72702600A US2001000223A1 US 20010000223 A1 US20010000223 A1 US 20010000223A1 US 72702600 A US72702600 A US 72702600A US 2001000223 A1 US2001000223 A1 US 2001000223A1
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- United States
- Prior art keywords
- cutting
- insert
- rake
- cutting edge
- edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 238000005520 cutting process Methods 0.000 title claims abstract description 351
- 239000000463 material Substances 0.000 title claims description 96
- 239000004567 concrete Substances 0.000 title claims description 34
- 238000005553 drilling Methods 0.000 title description 8
- 239000000843 powder Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 28
- 230000003116 impacting effect Effects 0.000 claims description 14
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K5/00—Making tools or tool parts, e.g. pliers
- B21K5/02—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/005—Cylindrical shanks of tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
- E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/75—Stone, rock or concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/02—Features of shanks of tools not relating to the operation performed by the tool
- B23B2231/026—Grooves
- B23B2231/0264—Axial grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2240/00—Details of connections of tools or workpieces
- B23B2240/08—Brazed connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/48—Chip breakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/50—Drilling tools comprising cutting inserts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/78—Tool of specific diverse material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/909—Having peripherally spaced cutting edges
- Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
- Y10T408/9097—Spiral channel
Definitions
- the present invention relates to cutting tools or drill bits, and more particularly, to cutting tools which are used in hammering, percussive, or rotary boring or drilling applications in concrete, aggregate, masonry or the like material.
- bits When drilling concrete, aggregate or the like materials, generally three different types of cutting tools or bits are used. These bits can be defined as hammer bits, percussive bits, and rotary masonry bits.
- a true hammer bit the bit is placed into a driver which includes a hammer which is sequentially and repetitiously moved toward and away from the bit. This hammering action hammers the bit. While the bit is being hammered, the bit continues to either passively or actively rotate.
- the driver may include a rotational feature where the bit is hammered and actively rotated.
- the drive includes a chuck which is associated with stepping cam surfaces on gears which are rotated and, at the same time, moved up and down within the driver.
- the entire chuck mechanism rotates and moves up and down during the cutting process.
- a rotary masonry bit is positioned into a driver which provides only a rotary movement. Thus, the rotary masonry bit does not move up and down and just rotates to cut at the concrete or aggregate.
- Existing hammer and percussive cutting tools ordinarily include carbide insert tips with cutting edges which have large obtuse included angles as well as a negative rake face at large acute angles.
- the tip has been utilized to chisel and rotate to drill or bore into the concrete material.
- the rotary masonry bits ordinarily use a rake face on the bit so that when it is rotated, it will bore through the concrete material.
- the carbide powder is laterally pressed into a mold to form the tip.
- This tip is inserted directly and welded or brazed onto a tool shank.
- the present invention has an improved cutting tip with a rake face which is slightly negative, zero or positive.
- the tip cutting angle which is the angle between the rake face and clearance face, is smaller than current designs to provide better chiseling action.
- the insert can be formed from pressed powder and maintain the desired tip cutting angle.
- the debris recess of the present invention rapidly ejects debris from the tip into the helical flutes. A rake face on the cutting tools increases cutting action during rotation of the cutting tools in the hole.
- the formed carbide tip is worked, contrary to conventional teaching, to increase performance of the tip in drilling concrete, aggregate, masonry or the like material.
- the term “works” means the tip is ground or otherwise to sharpen or form a sharpened cutting edge on the tool.
- the insert can be pressed powdered metal and still maintain the desired tip cutting angle.
- the present invention has a larger egress space. Egress space is defined as the open volume through which debris may pass on its way from being created to the flute of the bit to enable faster removal of debris.
- a cutting tool comprises a longitudinally extending shank portion which defines a longitudinal axis and two ends. One end has a chucking part and the other end has a cutting head. A cutting edge is on the cutting head and includes at least one cutting portion. A rake surface is formed adjacent to at least one of the cutting portions. Also, a clearance face is formed adjacent to the at least one cutting portion opposite the rake face. An edge radius is formed between the rake face and the clearance face and has a radius from about 0.0005 to 0.001 inch. Likewise, a method of boring a hole in concrete, aggregate or the like material is disclosed using the above cutting tool.
- the cutting edge of the cutting tool is placed in contact with the concrete, aggregate or the like material.
- the cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material.
- the tool may be impacted to chisel away the material to form the hole.
- both boring and impacting may be conducted simultaneously.
- a cutting tool includes a longitudinally extending shank with a chucking end and a cutting head.
- a cutting edge is formed in the cutting head with at least one cutting edge portion.
- a rake surface is formed adjacent to at least one of the cutting portions with the rake face at an angle of from about ⁇ 10° to 10°.
- a method for boring a hole in concrete, aggregate or the like material is disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally both boring and impacting may be conducted simultaneously.
- a cutting tool in accordance with a fourth aspect of the invention, includes a shank portion with a chucking end and a cutting head.
- the head includes a cutting edge with at least one cutting edge portion.
- a rake surface is formed adjacent to at least one cutting edge portion.
- a clearance surface is formed adjacent to the at least one cutting portion opposite the rake face.
- One or both the rake surface and clearance surface are worked to form a sharpened edge radius.
- a method of boring a hole in concrete, aggregate or the like material is disclosed using the cutting tool.
- the cutting edge of the cutting tool is placed in contact with the material.
- the cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material.
- the tool may be impacted to chisel away the material to form the hole.
- both boring and impacting may be conducted simultaneously.
- a cutting tool comprises a longitudinal shank with a chucking part at one end and a cutting head at the other end.
- the cutting head includes a cutting edge with at least one cutting edge portion.
- a rake surface is formed adjacent to the at least one of the cutting edge portion.
- a primary egress surface is formed immediately adjacent the rake surface such that the rake surface, and primary egress surface define a new egress path.
- a cutting tool comprises a longitudinally extending shank with a chucking part at one end and a cutting head at the other end.
- the cutting head includes a cutting edge with at least one cutting edge portion.
- a rake surface is formed adjacent to the at least one cutting edge portion.
- the rake surface includes a worked portion which extends from the cutting edge portion to define a length of relief.
- the depth of the length of relief is a ratio to tool diameter of about 0.10 to 0.32 inches per inch diameter of the tool.
- a method for boring a hole into concrete, aggregate or the like material is disclosed using the above cutting tool.
- the cutting edge of the cutting tool is placed in contact with the aggregate.
- the cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material.
- the tool may be impacted to chisel away the material to form the hole.
- both boring and impacting may be conducted simultaneously.
- a cutting tool comprises a longitudinally extending shank portion which defines a longitudinal axis and two ends. One end has a chucking part and the other end has a cutting head.
- a press powdered metal cutting insert is secured on the cutting head.
- a cutting edge is on the cutting insert and includes at least one cutting portion.
- a rake surface is formed, during pressing of the powder, adjacent to at least one of the cutting portions.
- a clearance face is formed adjacent to the at least one cutting portion opposite the rake face.
- An edge radius is formed between the rake face and the clearance face and has a radius of from about 0.0015 to 0.004 inch.
- a method of boring a hole in concrete aggregate or the like material is disclosed using the above cutting tool.
- the cutting edge of the cutting tool is placed in contact with the concrete aggregate or the like material.
- the cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material.
- the tool instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole.
- both boring and impacting may be conducted simultaneously.
- a cutting tool includes a longitudinally extending shank with a chucking end and a cutting head.
- a cutting insert is secured in the cutting head.
- a cutting edge is formed in the cutting insert with at least one cutting edge portion.
- a rake surface is formed, during the powder pressing process, adjacent to at least one of the cutting edge portions with the rake face at an angle from 0° to about 10°.
- a method for boring a hole in concrete, aggregate or the like materials disclosed using the above cutting tool The cutting edge of the cutting tool is placed in contact with the material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally, both boring and impacting may be conducted simultaneously.
- an insert is formed by a press powdered metal operation.
- a mold is provided with an insert cavity which defines a longitudinal axis and has an opening along the longitudinal axis. Powdered metal material is added into the mold. The powdered metal material is compressed in the direction of the longitudinal axis to form the insert.
- the method forms inserts like that described in the seventh and eight aspects. The method includes a V-shaped punch to compress the powdered metal material. Also during compressing of the insert, a land is formed on the face of the insert. The land is at an acute angle and counter clockwise with respect to the axis of the insert. The land and the rake face may be joined in a radius.
- FIG. 1 is a perspective view of a prior art cutting tool.
- FIG. 2 is a side plan view of the cutting tool of FIG. 1.
- FIG. 3 is a side plan view, rotated 90°, of the cutting tool of FIG. 1.
- FIG. 4 is a top plan view of the cutting tool of FIG. 1.
- FIG. 5 is an auxiliary view along the cutting edge of the cutting tool of FIG. 2 illustrating the rake surface.
- FIG. 6 is a perspective view of another prior art cutting tool.
- FIG. 7 is a side plan view of the cutting tool of FIG. 6.
- FIG. 8 is a side plan view, rotated 90°, of the cutting tool of FIG. 6.
- FIG. 9 is a top plan view of the cutting tool of FIG. 6.
- FIG. 10 is an auxiliary view along the cutting edge of the cutting tool of FIG. 7 illustrating the rake surface.
- FIG. 11 is an enlarged side plan view of a cutting radius of FIGS. 5 and 10 in circle 11 .
- FIG. 12 is a perspective view of a cutting tool in accordance with the present invention.
- FIG. 13 is a side plan view of the cutting tool of FIG. 12.
- FIG. 14 is a side plan view, rotated 90°, of the cutting tool of FIG. 12.
- FIG. 15 is a top plan view of the cutting tool of FIG. 12.
- FIG. 16 is an auxiliary view along the cutting edge of the cutting tool of FIG. 12 illustrating the rake surface.
- FIG. 17 is a perspective view of an alternate embodiment of the present invention.
- FIG. 18 is a side plan view of the cutting tool of FIG. 17.
- FIG. 19 is a side plan view, rotated 90°, of the cutting tool of FIG. 17.
- FIG. 20 is a top plan view of the cutting tool of FIG. 17.
- FIG. 21 is an auxiliary view along the cutting edge of the cutting tool of FIG. 17 illustrating the rake surface.
- FIG. 22 is an enlarged view of the edge radius of FIGS. 16 and 21 within circle 22 .
- FIG. 23 is a side plan view, partially in section, of the cutting tool of FIG. 12 rotating within a material.
- FIG. 24 is a view like FIG. 23 with the cutting tool impacting or chiseling the material.
- FIG. 25 is a partial cross section of a side plan view of the cutting tool of FIG. 17 in the material during rotary boring.
- FIG. 26 is a figure like that of FIG. 25 with the cutting tool impacting or chiseling the material.
- FIG. 27 is a figure like that of FIG. 25 with the cutting tool rotating and impacting or chiseling the material.
- FIG. 28 is an auxiliary view along the cutting edge of a cutting tool of an alternate embodiment illustrating an arcuate first egress surface and area.
- FIG. 29 is a side plan view of another embodiment of a cutting tool with a 180° included angle.
- FIG. 30 is a side plan view like FIG. 29 rotated 90°.
- FIG. 31 is a perspective view of an alternate embodiment of the present invention.
- FIG. 32 is a side plan view of the cutting tool of FIG. 31.
- FIG. 33 is a side plan view, rotated 90°, of the cutting tool of FIG. 31.
- FIG. 34 is an auxiliary view along the cutting edge of the cutting tool of FIG. 31 illustrating the rake surface.
- FIG. 35 is a top plan view of the cutting tool of FIG. 31.
- FIG. 36 is an enlarged view of the edge radius of FIG. 34.
- FIG. 37 is an enlarged auxiliary view like that of FIG. 34.
- FIG. 38 is a plan view of an insert in accordance with the present invention.
- FIG. 39 is a schematic elevation view of a mold in accordance with the invention.
- FIG. 40 is a section view along line 40 - 40 of FIG. 39.
- FIG. 41 is a section view along line 41 - 41 of FIG. 39.
- FIGS. 1 through 11 two prior art cutting tools are illustrated.
- FIGS. 1 through 5 illustrate a ball head single flute cutting tool
- FIGS. 6 through 10 illustrate a double helix cutting tool.
- FIG. 11 illustrates the edge radius of both the cutting tools.
- the ball head single helix cutting tool is designated with the reference numeral 100 and the double helix reference tool is designated with the reference numeral 102 .
- the single flute cutting tool 100 has a chucking end 104 for a hammer driver and a ball cutting head 106 .
- the shank 108 has the single helix 110 defining a flute 112 .
- the flute 112 ends at the cutting head 106 at a debris channel 114 .
- an additional debris channel 116 is on the opposing side of the head, which dumps directly into the flute 112 , as seen in FIG. 3.
- the cutting head 106 includes an insert 118 , which includes a cutting edge 120 , either brazed or welded or the like into a slot 122 in the cutting head 106 .
- the insert is formed by placing powdered carbide into a mold and compressing it. The insert is directly welded or brazed as described.
- the cutting edge 120 is defined by rake faces 124 , edge radius 125 , and clearance faces 126 .
- first egress faces 128 are directly adjacent to the rake faces and egress area 129 forms the remainder of the egress portion.
- the egress area 129 may be on the same angle as the rake faces 124 .
- the rake angle is negative and is about ⁇ 30° to about ⁇ 40°.
- the egress faces 128 lead into the debris channel 114 , 116 .
- the rake faces 124 have a substantial negative rake angle with the exception of some percussive bits which are at 00 .
- the edge radius 125 as can best be seen in FIG.
- the rake face 124 and clearance face 126 define a cutting angle between the two surfaces.
- the cutting angle is important for chiseling action and is about 45° to 110°.
- the chucking end 104 ′ is different from that of the single flute cutting tool 100 to illustrate a rotary or percussive type chucking end.
- the tool includes helixes 111 and 113 as well as flutes 115 and 117 .
- the debris channels 114 and 116 are formed at the end of each of the flutes.
- the cutting tip insert 118 is the same as that previously described and the rake faces 124 , cutting edge 120 , clearance surfaces 126 and first egress surface 128 ′ and egress area 129 ′ are identified with the same numbers. However, the egress area 129 ′ is different than that in the single flute design. Here, the egress area is parallel to the rake face. Also, the debris channels 114 ′, 116 ′ are substantially identical.
- Both of these cutting tools illustrate a cutting tip having a large obtuse included angle between the two cutting edges on the order of 120° to 130°.
- the egress angle ordinarily about 30° to 35°, defining the plane of the egress area is relatively shallow.
- the clearance angle ordinarily about 20° to 30°, which defines the plane of the clearance surface is also shallow.
- a cutting angle, between the rake face and clearance face is ordinarily about 90 to 110.
- angles are true angles. True angles are taken by defining a plane parallel to the center line of the tool and through the cutting edge in an auxiliary view with the cutting edge as a point. See FIGS. 5, 10, 16 , 21 .
- the rake angle, designated by a is the angle measured from the defined plane to the rake face.
- the clearance angle, designated by CA is the complement of the angle measured from the defined plane to the clearance face.
- the cutting angle, designated by ⁇ is the angle between the clearance face and rake face.
- the cutting angle ⁇ is equal to ⁇ +(90 ⁇ CA).
- the egress angle, designated by ⁇ is the angle from the defined plane to the egress face.
- Positive rake angles are defined by clockwise rotation from a point on the defined plane at the cutting edge to the rake face, when viewed along the cutting edge from the outside diameter of the bit.
- Negative rake angles are defined by counterclockwise rotation from a point on the defined plane at the cutting edge to the rake face, when viewed along the cutting edge from the outside diameter of the bit.
- FIGS. 12 through 26 illustrate a single helix design, designated with the reference numeral 200
- FIGS. 17 through 21 illustrate a double helix design, designated with the reference numeral 300 , respectively.
- the single helix cutting tool 200 includes a chucking end 204 , in this particular case illustrated as a spline for a hammer driver, however, a percussive and/or a cylindrical rotary end or other attachment and drive means could be used.
- a cutting head 206 is at the other end of the cutting tool 200 and a shank 208 is between the two ends.
- the helix 210 defines a flute 212 .
- the flute 212 ends at the cutting head 206 into a debris channel or recess 214 .
- a second debris channel or recess 216 is cut into the cutting head 206 opposing the recess 214 .
- the cutting head 206 includes an insert 218 which includes cutting edge 220 , rake faces 224 , and clearance faces 226 . Likewise, egress faces 228 are immediately adjacent the rake faces 224 .
- the insert 218 has an overall pentagonal shape of a house with the cutting edge 220 defining the roof, sides 230 and 232 , and a base 234 which is substantially perpendicular to the two parallel sides 230 and 232 . Also, the cutting edge could be along a straight line to provide a rectangular insert, as seen in FIG. 29 and 30 . Here corresponding reference numerals are increased by 200. Thus, the cutting tool is designated with the reference numeral 400 .
- the insert 218 is brazed, welded or the like into the slot 222 in the cutting head 206 .
- the insert 218 is generally manufactured from a carbide material, such as carbide or tungsten carbide, however, ceramics, ceramic composites, diamond dust, metal ceramic composites or a unitary homogeneous or a deposit of layers could be used. Also, the entire cutting tool could be manufactured from such material or a portion thereof, including the head 206 manufactured from such a material, eliminating the insert 218 .
- a carbide material such as carbide or tungsten carbide
- ceramics, ceramic composites, diamond dust, metal ceramic composites or a unitary homogeneous or a deposit of layers could be used.
- the entire cutting tool could be manufactured from such material or a portion thereof, including the head 206 manufactured from such a material, eliminating the insert 218 .
- the cutting edges 220 are defined by rake faces 224 , edge radius 240 and the clearance faces 226 .
- the cutting edges 220 include a primary cutting edge 236 and a secondary cutting edge 238 .
- the primary cutting edge 236 is on an acute angle with respect to the longitudinal axis 242
- the secondary cutting edge 238 is substantially perpendicular to the longitudinal axis 242 .
- the cutting edges 220 include edge radius 240 between the rake faces 224 and clearance faces 226 (see FIG. 22).
- the edge radius 240 defines the sharpness of the cutting tool.
- An edge radius 240 of the present invention is generally between 0.0003 to 0.004 and preferably between 0.0005 to 0.001. Having a desired edge radius 240 provides a desired sharpness to enable the cutting tool to cut through the concrete, aggregate or the like material during rotation of the cutting tool.
- the edge radius is formed by working, such as by grinding or the like, the clearance face and the rake face.
- the two cutting edges 220 form a tip or point 221 between them.
- the included angle (IA) between the two cutting edges 220 is from about 90° to 180° and preferably about 100 to 160.
- the cutting edges 220 are offset from the longitudinal axis 242 of the cutting tool 200 .
- the rake faces 224 are worked or ground into the insert and define rake angles ⁇ as defined above.
- the rake angle ⁇ is between 10° to ⁇ 10°, preferably at about 0° for the primary cutting edge portion 236 .
- the rake angle is between ⁇ 50° to ⁇ 20° preferably ⁇ 40° for the secondary cutting edge portion 238 .
- the worked rake surfaces are substantially parallel to the longitudinal axis 242 .
- the rake faces 224 are formed by working, such as grinding or the like, into both sides of the insert 218 and extend a desired distance from the cutting edge 220 .
- the distance or depth which the rake faces 224 , which are worked or ground into the insert, extend from the cutting edge is known as the length of relief.
- the depth of the length of relief is measured from the cutting edge 220 along the longitudinal axis 242 to a first egress surface 244 .
- the length of relief of the rake faces 224 has a depth of about 0.08 to about 0.25 inch for a 3 ⁇ 4 inch diameter bit. Preferably, the depth is from about 0.15 to about 0.25 inch.
- the length of relief can be defined as a ratio with respect to the diameter of the tool. Thus, the length of relief ratio is about 0.10 to about 0.32 inches per inch diameter of the tool.
- the first egress surface 244 angles from the terminus or end of the length of relief.
- the first egress surface 244 is generally angled with respect to the rake face 224 , providing an overall stepped cutting head, as seen in FIGS. 16 and 21.
- the angle of the first egress surface 244 is from about 30° to 90° and preferably 55° to 60° and may be continuous with and at the same angle as the egress area 228 .
- the clearance surface 226 which includes a portion of the insert 218 and the cutting head 206 define a clearance angle CA.
- the clearance angle CA is defined as mentioned above. This clearance angle is from about 10° to about 50° and preferably about 20° to 40° for hammer and percussive tools and 30° to 50° for rotary only tools.
- a cutting angle ⁇ is defined between the clearance face 226 and rake face 224 .
- the cutting angle ⁇ is from about 30° to 90° and preferably from about 40° to 60° for the primary cutting edge portion.
- the cutting angle for the secondary cutting edge portion varies from 60° to 120° preferably from 80° to 100°. These cutting angles define a primary cutting edge portion which enhances cutting action, while the cutting angle defined for the secondary cutting edge portion enhances the chiseling action of the cutting tool.
- the egress area 228 defines an egress angle ⁇ which is measured as mentioned above.
- the egress area 228 is adjacent to the first egress surface 244 .
- the angle is at least 0° and preferably from about 30° to 60° for hammer and percussive tools and at about ⁇ 20° to 90° for rotary only tools, preferably about ⁇ 20° to 20° for hammer and percussive tools and 45° to 105° for rotary only tools.
- the first egress surface 244 ′ and egress area 228 ′ may be arcuate as seen in FIG. 28. Here they are shown on the same arc, however, they could be on different arcs.
- This egress angle and surface enhance the transport of debris from the tool tip into the flute 212 of the shank 208 .
- choking is prohibited at the cutting head 206 .
- a larger volume of material is removed from the ball head enabling better debris removal.
- the cutting tool 300 includes a chuck end 304 which is a rotary or percussive type of cutting tool end. Also, the helixes 307 and 309 and flutes 310 and 312 are different from those previously described. The helixes 310 and 312 end at the cutting head 306 , thus enabling the debris recesses 314 and 316 to include a larger volume of debris.
- the remaining portions of the cutting head 306 are designated with reference numerals increased by a hundred and the description is the same as in the first embodiment since these elements are the same.
- the difference in the head 306 in the egress area 328 and clearance surface 326 is due to a reduced amount of material present in the double helix design than is present in the single helix design. Otherwise, the angle parameters previously described are the same with the double helix design as they are with the single helix design.
- the cutting tools of the present invention are illustrated in concrete, aggregate or the like material, boring a hole.
- the cutting tools may be used to bore, but are not limited to, cap block, brick, stone, ceramic materials, concrete, aggregate, black top, rock, cement, masonry or the like materials.
- the bit of the present invention contacts the concrete, aggregate or the like material.
- the cutting tool may be rotated only where the rake face of the cutting tool cuts and bores a hole into the material.
- the cutting tool contacts the concrete, aggregate or the like material and impacts or chisels the material to form a hole.
- the cutting tool may contact the material and impacting and rotating movement utilized together to bore a hole as seen in FIG. 27.
- the impacting is sequential and repetitious so that a constant repeating force is applied onto the cutting tool.
- a constant force may be applied to the driver.
- FIGS. 31 through 37 illustrate a double helix embodiment of the present invention.
- Cutting tool 500 includes a chuck end 504 which is a rotary or percussive type of cutting tool end. Also, the helixes 507 and 509 and the flutes 510 and 512 are like those previously described with respect to FIGS. 17 through 21. The helixes 510 and 512 end at the cutting head 506 , thus enabling the debris recesses 514 and 516 to include a larger volume of debris.
- the cutting head 506 includes an insert 518 which includes cutting edges 520 , rake faces 524 and clearance faces 526 . Likewise, egress faces 528 are immediately adjacent the rake face 524 .
- the insert 518 has an overall pentagonal shape of a house with the cutting edge 520 defining the roof, sides 530 and 532 , and a base 534 , which is substantially perpendicular to the two parallel sides 530 and 532 . Also the cutting edges 520 could be along a straight line to provide a rectangular insert as seen in FIGS. 29 and 30.
- the insert 518 is braised, welded or the like into the slot 522 on the cutting head 506 .
- the insert 518 is generally manufactured from a carbide material such as a cobalt carbide mixture however, ceramic, ceramic composites, diamond dust, metal ceramic composites or a unitary homogeneous or a deposit of layers could be used.
- Cutting edges 520 are defined by rake faces 524 , edge radii 540 and clearance faces 526 .
- the cutting edges 520 include a primary cutting edge 536 and a secondary cutting edge 538 .
- the primary cutting edge 536 is on an acute angle with respect to a longitudinal axis 542
- the secondary cutting edge 538 is substantially perpendicular to the longitudinal axis 542 .
- the cutting edges 520 include edge radius 540 between the rake faces 524 and clearance faces 526 as seen in FIG. 36.
- the edge radius 540 defines a sharpness of the cutting tool.
- An edge radius 540 of the present invention is between 0.0015 to 0.004 and preferably between 0.002 to 0.003. Having a desired edge radius 540 provides a desired sharpness to enable the cutting tool to cut through the concrete, aggregate or the like material during rotation of the cutting tool.
- the edge radius as mentioned above is formed during the powder pressing operation.
- the included angle between the two cutting edges is like those previously described.
- the rake face angle ⁇ is between 10° and 0° preferably at about 5°. However, these angles are formed during the pressing operation. Also, the angles of the primary and secondary cutting edge are similar to those described above.
- the clearance angle CA as well as the cutting angle ⁇ are the same as those described above.
- a first egress surface is eliminated and an egress area 528 is defined by an egress angle ⁇ which is measured as mentioned above.
- the egress area 528 is adjacent to the rake face 524 .
- the angle is between 80° and 100° and is preferably about 90°.
- the insert 518 is illustrated with a clearance face 526 , rake faces 524 and a trailing face 525 .
- the land 533 is formed between the clearance face 524 and the trailing face 525 .
- the width (X) of the rake face 524 , at the bottom of the insert, along the base 534 is wider than the width (Y) of the trailing face 525 such that an angle B is formed along the land 533 with respect to the central axis 559 .
- the line extending from the land 533 is on an angle which is counter clockwise away from the central axis. This angle enables the insert to be removed from the mold.
- a V-shaped punch 560 forms the roof of the insert 518 and an ejector pin 562 , in the mold 564 , ejects the insert after it has been molded.
- Powdered metal is poured into the mold 564 and the punch 560 is inserted compressing the powder metal within the mold 564 .
- the portion 568 of the mold 564 forming the rake face 524 extends inward from the portion 570 of the mold 564 that forms the trailing face 525 .
- the width of the molds are substantially the same as seen in FIG. 41.
- the insert 518 when the insert 518 is ejected from the mold 564 , since the bottom portion of the rake face 524 is in an area as it exits the mold which is wider than the rake face base portion of the insert 518 , the insert 518 is easily ejected from the mold 564 . However, if the angle B was clockwise with respect to the central axis 559 , the land would be formed in the opposite direction and the insert would be jammed within the mold since the bottom of the insert would be wider than the width of the top of the mold.
- the punch 560 By having the punch 560 move axially with respect to the insert, the desired rake faces 524 and clearance faces 526 as well as the edge radii 540 are formed on the insert 518 .
- the above identified insert 518 forming is contrary to conventional molding of positive rake carbide inserts, which moves a punch laterally or perpendicular to the axis of the insert, to form the insert.
- a cutting tool in accordance with the invention, ordinarily the tool would be made in methods consistent with those in the art.
- the rake surfaces, egress surfaces and clearance surfaces would be ground or formed by other conventional means into the cutting tool to form the desired surfaces with desired angles.
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Abstract
A cutting tool (500) has a longitudinally extending shaft portion (588) with a chucking part (509) and a cutting head (506). A pressed powder cutting insert (518) with a cutting edge (520) is on the cutting head (506). The cutting edge (520) includes at least one cutting portion. A rake surface (524) is formed adjacent to at least one of the cutting portions (520) with the rake face (524) being at a rake angle from about 0° to 10°. A clearance face (526) is formed adjacent to the at least one cutting portion opposite the rake face (524). The clearance face (526) is at a clearance angle from about 10° to 50°. An edge radius (540) between the rake face (524) and the clearance face (526) is at a radius of from about 0.0015 to about 0.004 inch. The edge radius 540 is formed during pressing of the powder to form the insert, thus, enabling the insert to be directly braised into the cutting head (506).
Description
- 1. This application is a continuation-in-part of U.S. patent application Ser. No. 08/354,349, filed Dec. 12, 1994, entitled CUTTING TOOLS FOR DRILLING CONCRETE, AGGREGATE, MASONRY OR THE LIKE MATERIALS, the specification and drawings of which are expressly incorporated by reference.
- 2. The present invention relates to cutting tools or drill bits, and more particularly, to cutting tools which are used in hammering, percussive, or rotary boring or drilling applications in concrete, aggregate, masonry or the like material.
- 3. When drilling concrete, aggregate or the like materials, generally three different types of cutting tools or bits are used. These bits can be defined as hammer bits, percussive bits, and rotary masonry bits. In a true hammer bit, the bit is placed into a driver which includes a hammer which is sequentially and repetitiously moved toward and away from the bit. This hammering action hammers the bit. While the bit is being hammered, the bit continues to either passively or actively rotate. Thus, this type of cutting would be synonymous with using a chisel and hitting it with a hammer. Also, the driver may include a rotational feature where the bit is hammered and actively rotated.
- 4. In percussive drilling, the drive includes a chuck which is associated with stepping cam surfaces on gears which are rotated and, at the same time, moved up and down within the driver. Thus, the entire chuck mechanism rotates and moves up and down during the cutting process.
- 5. A rotary masonry bit is positioned into a driver which provides only a rotary movement. Thus, the rotary masonry bit does not move up and down and just rotates to cut at the concrete or aggregate.
- 6. Cutting tools in these three fields require different parameters for each type of application. In hammer and percussive bits, which utilize a chiseling action, the tip cutting angle, which provides tip strength, debris elimination and a cutting or rake face are a primary concern. Likewise, in rotary masonry drilling, which uses purely rotary movement, the cutting or rake face, debris clean out and cutting angle are also of primary importance. However, all of these elements are interrelated to provide an optimum cutting tool or drill bit to drill concrete, aggregate and the like materials.
- 7. Existing hammer and percussive cutting tools ordinarily include carbide insert tips with cutting edges which have large obtuse included angles as well as a negative rake face at large acute angles. Thus, the tip has been utilized to chisel and rotate to drill or bore into the concrete material. The rotary masonry bits ordinarily use a rake face on the bit so that when it is rotated, it will bore through the concrete material.
- 8. Further, when the carbide tips are formed, the carbide powder is laterally pressed into a mold to form the tip. This tip is inserted directly and welded or brazed onto a tool shank. Thus, this is the art accepted way to form current design tools or bits.
- 9. Accordingly, it is an object of the present invention to provide the art with a cutting tool or bit which will reduce the time to drill holes into concrete, aggregate or the like material and improve the quality of the hole. The present invention has an improved cutting tip with a rake face which is slightly negative, zero or positive. The tip cutting angle, which is the angle between the rake face and clearance face, is smaller than current designs to provide better chiseling action. Also, the insert can be formed from pressed powder and maintain the desired tip cutting angle. The debris recess of the present invention rapidly ejects debris from the tip into the helical flutes. A rake face on the cutting tools increases cutting action during rotation of the cutting tools in the hole.
- 10. Also, in accordance with one aspect of the present invention, the formed carbide tip is worked, contrary to conventional teaching, to increase performance of the tip in drilling concrete, aggregate, masonry or the like material. The term “works” means the tip is ground or otherwise to sharpen or form a sharpened cutting edge on the tool. In another aspect, it has been found that the insert can be pressed powdered metal and still maintain the desired tip cutting angle. Further, in a ball head design tool, the present invention has a larger egress space. Egress space is defined as the open volume through which debris may pass on its way from being created to the flute of the bit to enable faster removal of debris.
- 11. In accordance with a second aspect of the invention, a cutting tool comprises a longitudinally extending shank portion which defines a longitudinal axis and two ends. One end has a chucking part and the other end has a cutting head. A cutting edge is on the cutting head and includes at least one cutting portion. A rake surface is formed adjacent to at least one of the cutting portions. Also, a clearance face is formed adjacent to the at least one cutting portion opposite the rake face. An edge radius is formed between the rake face and the clearance face and has a radius from about 0.0005 to 0.001 inch. Likewise, a method of boring a hole in concrete, aggregate or the like material is disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the concrete, aggregate or the like material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternately, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally both boring and impacting may be conducted simultaneously.
- 12. In accordance with a third aspect of the invention, a cutting tool includes a longitudinally extending shank with a chucking end and a cutting head. A cutting edge is formed in the cutting head with at least one cutting edge portion. A rake surface is formed adjacent to at least one of the cutting portions with the rake face at an angle of from about −10° to 10°. A method for boring a hole in concrete, aggregate or the like material is disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally both boring and impacting may be conducted simultaneously.
- 13. In accordance with a fourth aspect of the invention, a cutting tool includes a shank portion with a chucking end and a cutting head. The head includes a cutting edge with at least one cutting edge portion. A rake surface is formed adjacent to at least one cutting edge portion. Additionally, a clearance surface, is formed adjacent to the at least one cutting portion opposite the rake face. One or both the rake surface and clearance surface are worked to form a sharpened edge radius. A method of boring a hole in concrete, aggregate or the like material is disclosed using the cutting tool. The cutting edge of the cutting tool is placed in contact with the material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally both boring and impacting may be conducted simultaneously.
- 14. In accordance with a fifth aspect of the invention, a cutting tool comprises a longitudinal shank with a chucking part at one end and a cutting head at the other end. The cutting head includes a cutting edge with at least one cutting edge portion. A rake surface is formed adjacent to the at least one of the cutting edge portion. A primary egress surface is formed immediately adjacent the rake surface such that the rake surface, and primary egress surface define a new egress path. A method for boring a hole in concrete aggregate or the like material is disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally both boring and impacting may be conducted simultaneously.
- 15. In accordance with a sixth aspect of the invention, a cutting tool comprises a longitudinally extending shank with a chucking part at one end and a cutting head at the other end. The cutting head includes a cutting edge with at least one cutting edge portion. A rake surface is formed adjacent to the at least one cutting edge portion. The rake surface includes a worked portion which extends from the cutting edge portion to define a length of relief. The depth of the length of relief is a ratio to tool diameter of about 0.10 to 0.32 inches per inch diameter of the tool. A method for boring a hole into concrete, aggregate or the like material is disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the aggregate. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally both boring and impacting may be conducted simultaneously.
- 16. In accordance with a seventh aspect of the invention, a cutting tool comprises a longitudinally extending shank portion which defines a longitudinal axis and two ends. One end has a chucking part and the other end has a cutting head. A press powdered metal cutting insert is secured on the cutting head. A cutting edge is on the cutting insert and includes at least one cutting portion. A rake surface is formed, during pressing of the powder, adjacent to at least one of the cutting portions. Also, a clearance face is formed adjacent to the at least one cutting portion opposite the rake face. An edge radius is formed between the rake face and the clearance face and has a radius of from about 0.0015 to 0.004 inch. Likewise, a method of boring a hole in concrete aggregate or the like material is disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the concrete aggregate or the like material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally, both boring and impacting may be conducted simultaneously.
- 17. In accordance with an eighth aspect of the invention, a cutting tool includes a longitudinally extending shank with a chucking end and a cutting head. A cutting insert is secured in the cutting head. A cutting edge is formed in the cutting insert with at least one cutting edge portion. A rake surface is formed, during the powder pressing process, adjacent to at least one of the cutting edge portions with the rake face at an angle from 0° to about 10°. A method for boring a hole in concrete, aggregate or the like materials disclosed using the above cutting tool. The cutting edge of the cutting tool is placed in contact with the material. The cutting tool is rotated to bore the material. Due to the boring, a hole is formed in the material. Alternatively, instead of rotating the tool, the tool may be impacted to chisel away the material to form the hole. Optionally, both boring and impacting may be conducted simultaneously.
- 18. In accordance with a ninth aspect of the invention, an insert is formed by a press powdered metal operation. A mold is provided with an insert cavity which defines a longitudinal axis and has an opening along the longitudinal axis. Powdered metal material is added into the mold. The powdered metal material is compressed in the direction of the longitudinal axis to form the insert. The method forms inserts like that described in the seventh and eight aspects. The method includes a V-shaped punch to compress the powdered metal material. Also during compressing of the insert, a land is formed on the face of the insert. The land is at an acute angle and counter clockwise with respect to the axis of the insert. The land and the rake face may be joined in a radius.
- 19. Additional objects and advantages of the invention will be apparent from the detailed description of the preferred embodiment, the appended claims and the accompanying drawings, or may be learned by practice of the invention.
- 20. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate two embodiments of the present invention and together, with the description, serve to explain the principles of the invention. In the drawings, the same reference numeral indicates the same parts.
- 21.FIG. 1 is a perspective view of a prior art cutting tool.
- 22.FIG. 2 is a side plan view of the cutting tool of FIG. 1.
- 23.FIG. 3 is a side plan view, rotated 90°, of the cutting tool of FIG. 1.
- 24.FIG. 4 is a top plan view of the cutting tool of FIG. 1.
- 25.FIG. 5 is an auxiliary view along the cutting edge of the cutting tool of FIG. 2 illustrating the rake surface.
- 26.FIG. 6 is a perspective view of another prior art cutting tool.
- 27.FIG. 7 is a side plan view of the cutting tool of FIG. 6.
- 28.FIG. 8 is a side plan view, rotated 90°, of the cutting tool of FIG. 6.
- 29.FIG. 9 is a top plan view of the cutting tool of FIG. 6.
- 30.FIG. 10 is an auxiliary view along the cutting edge of the cutting tool of FIG. 7 illustrating the rake surface.
- 31.FIG. 11 is an enlarged side plan view of a cutting radius of FIGS. 5 and 10 in circle 11.
- 32.FIG. 12 is a perspective view of a cutting tool in accordance with the present invention.
- 33.FIG. 13 is a side plan view of the cutting tool of FIG. 12.
- 34.FIG. 14 is a side plan view, rotated 90°, of the cutting tool of FIG. 12.
- 35.FIG. 15 is a top plan view of the cutting tool of FIG. 12.
- 36.FIG. 16 is an auxiliary view along the cutting edge of the cutting tool of FIG. 12 illustrating the rake surface.
- 37.FIG. 17 is a perspective view of an alternate embodiment of the present invention.
- 38.FIG. 18 is a side plan view of the cutting tool of FIG. 17.
- 39.FIG. 19 is a side plan view, rotated 90°, of the cutting tool of FIG. 17.
- 40.FIG. 20 is a top plan view of the cutting tool of FIG. 17.
- 41.FIG. 21 is an auxiliary view along the cutting edge of the cutting tool of FIG. 17 illustrating the rake surface.
- 42.FIG. 22 is an enlarged view of the edge radius of FIGS. 16 and 21 within
circle 22. - 43.FIG. 23 is a side plan view, partially in section, of the cutting tool of FIG. 12 rotating within a material.
- 44.FIG. 24 is a view like FIG. 23 with the cutting tool impacting or chiseling the material.
- 45.FIG. 25 is a partial cross section of a side plan view of the cutting tool of FIG. 17 in the material during rotary boring.
- 46.FIG. 26 is a figure like that of FIG. 25 with the cutting tool impacting or chiseling the material.
- 47.FIG. 27 is a figure like that of FIG. 25 with the cutting tool rotating and impacting or chiseling the material.
- 48.FIG. 28 is an auxiliary view along the cutting edge of a cutting tool of an alternate embodiment illustrating an arcuate first egress surface and area.
- 49.FIG. 29 is a side plan view of another embodiment of a cutting tool with a 180° included angle.
- 50.FIG. 30 is a side plan view like FIG. 29 rotated 90°.
- 51.FIG. 31 is a perspective view of an alternate embodiment of the present invention.
- 52.FIG. 32 is a side plan view of the cutting tool of FIG. 31.
- 53.FIG. 33 is a side plan view, rotated 90°, of the cutting tool of FIG. 31.
- 54.FIG. 34 is an auxiliary view along the cutting edge of the cutting tool of FIG. 31 illustrating the rake surface.
- 55.FIG. 35 is a top plan view of the cutting tool of FIG. 31.
- 56.FIG. 36 is an enlarged view of the edge radius of FIG. 34.
- 57.FIG. 37 is an enlarged auxiliary view like that of FIG. 34.
- 58.FIG. 38 is a plan view of an insert in accordance with the present invention.
- 59.FIG. 39 is a schematic elevation view of a mold in accordance with the invention.
- 60.FIG. 40 is a section view along line 40-40 of FIG. 39.
- 61.FIG. 41 is a section view along line 41-41 of FIG. 39.
- 62. Turning to FIGS. 1 through 11, two prior art cutting tools are illustrated. FIGS. 1 through 5 illustrate a ball head single flute cutting tool, while FIGS. 6 through 10 illustrate a double helix cutting tool. FIG. 11 illustrates the edge radius of both the cutting tools.
- 63. The ball head single helix cutting tool is designated with the
reference numeral 100 and the double helix reference tool is designated with thereference numeral 102. The singleflute cutting tool 100 has a chuckingend 104 for a hammer driver and aball cutting head 106. Theshank 108 has thesingle helix 110 defining aflute 112. Theflute 112 ends at the cuttinghead 106 at adebris channel 114. Also, anadditional debris channel 116 is on the opposing side of the head, which dumps directly into theflute 112, as seen in FIG. 3. - 64. The cutting
head 106 includes aninsert 118, which includes acutting edge 120, either brazed or welded or the like into aslot 122 in the cuttinghead 106. The insert is formed by placing powdered carbide into a mold and compressing it. The insert is directly welded or brazed as described. - 65. The
cutting edge 120 is defined by rake faces 124,edge radius 125, and clearance faces 126. Ordinarily, first egress faces 128 are directly adjacent to the rake faces andegress area 129 forms the remainder of the egress portion. Theegress area 129 may be on the same angle as the rake faces 124. The rake angle is negative and is about −30° to about −40°. The egress faces 128 lead into thedebris channel edge radius 125, as can best be seen in FIG. 11, is between the rake faces 124 and clearance faces 126 and, as can be seen, is relatively dull and is on the order of 0.004 to 0.008 inch as measured on some prior art examples. However, in rotary only bits, while these bits may have 0° rake angles, the edge radius is in the mentioned range. Also, therake face 124 andclearance face 126 define a cutting angle between the two surfaces. The cutting angle is important for chiseling action and is about 45° to 110°. Thus, with the negative rake angle and the dull edge radius, thecutting tool - 66. In the double
helix cutting tool 102, the chuckingend 104′ is different from that of the singleflute cutting tool 100 to illustrate a rotary or percussive type chucking end. The tool includeshelixes 111 and 113 as well asflutes head 106, thedebris channels - 67. The cutting
tip insert 118 is the same as that previously described and the rake faces 124, cuttingedge 120, clearance surfaces 126 andfirst egress surface 128′ andegress area 129′ are identified with the same numbers. However, theegress area 129′ is different than that in the single flute design. Here, the egress area is parallel to the rake face. Also, thedebris channels 114′, 116′ are substantially identical. - 68. Both of these cutting tools illustrate a cutting tip having a large obtuse included angle between the two cutting edges on the order of 120° to 130°. Also, the egress angle, ordinarily about 30° to 35°, defining the plane of the egress area is relatively shallow. Likewise, the clearance angle, ordinarily about 20° to 30°, which defines the plane of the clearance surface is also shallow. Also a cutting angle, between the rake face and clearance face, is ordinarily about 90 to 110.
- 69. When defining angle measurement, the angles are true angles. True angles are taken by defining a plane parallel to the center line of the tool and through the cutting edge in an auxiliary view with the cutting edge as a point. See FIGS. 5, 10, 16, 21. The rake angle, designated by a, is the angle measured from the defined plane to the rake face. The clearance angle, designated by CA, is the complement of the angle measured from the defined plane to the clearance face. The cutting angle, designated by β, is the angle between the clearance face and rake face. The cutting angle β is equal to α+(90−CA). The egress angle, designated by λ, is the angle from the defined plane to the egress face. Positive rake angles are defined by clockwise rotation from a point on the defined plane at the cutting edge to the rake face, when viewed along the cutting edge from the outside diameter of the bit. Negative rake angles are defined by counterclockwise rotation from a point on the defined plane at the cutting edge to the rake face, when viewed along the cutting edge from the outside diameter of the bit.
- 70. Turning to FIGS. 12 through 26, embodiments of the present invention are shown. FIGS. 12 through 16 illustrate a single helix design, designated with the
reference numeral 200, and FIGS. 17 through 21 illustrate a double helix design, designated with thereference numeral 300, respectively. - 71. The single
helix cutting tool 200 includes a chuckingend 204, in this particular case illustrated as a spline for a hammer driver, however, a percussive and/or a cylindrical rotary end or other attachment and drive means could be used. A cuttinghead 206 is at the other end of thecutting tool 200 and ashank 208 is between the two ends. Thehelix 210 defines aflute 212. Theflute 212 ends at the cuttinghead 206 into a debris channel orrecess 214. Likewise, a second debris channel orrecess 216 is cut into the cuttinghead 206 opposing therecess 214. - 72. The cutting
head 206 includes aninsert 218 which includescutting edge 220, rake faces 224, and clearance faces 226. Likewise, egress faces 228 are immediately adjacent the rake faces 224. - 73. The
insert 218 has an overall pentagonal shape of a house with thecutting edge 220 defining the roof, sides 230 and 232, and a base 234 which is substantially perpendicular to the twoparallel sides reference numeral 400. Theinsert 218 is brazed, welded or the like into theslot 222 in the cuttinghead 206. Theinsert 218 is generally manufactured from a carbide material, such as carbide or tungsten carbide, however, ceramics, ceramic composites, diamond dust, metal ceramic composites or a unitary homogeneous or a deposit of layers could be used. Also, the entire cutting tool could be manufactured from such material or a portion thereof, including thehead 206 manufactured from such a material, eliminating theinsert 218. - 74. The cutting edges 220 are defined by rake faces 224,
edge radius 240 and the clearance faces 226. The cutting edges 220 include aprimary cutting edge 236 and asecondary cutting edge 238. Theprimary cutting edge 236 is on an acute angle with respect to thelongitudinal axis 242, while thesecondary cutting edge 238 is substantially perpendicular to thelongitudinal axis 242. - 75. The cutting edges 220 include
edge radius 240 between the rake faces 224 and clearance faces 226 (see FIG. 22). Theedge radius 240 defines the sharpness of the cutting tool. Anedge radius 240 of the present invention is generally between 0.0003 to 0.004 and preferably between 0.0005 to 0.001. Having a desirededge radius 240 provides a desired sharpness to enable the cutting tool to cut through the concrete, aggregate or the like material during rotation of the cutting tool. The edge radius is formed by working, such as by grinding or the like, the clearance face and the rake face. - 76. The two
cutting edges 220 form a tip orpoint 221 between them. The included angle (IA) between the twocutting edges 220 is from about 90° to 180° and preferably about 100 to 160. - 77. The cutting edges 220 are offset from the
longitudinal axis 242 of thecutting tool 200. The rake faces 224 are worked or ground into the insert and define rake angles α as defined above. Generally, the rake angle α is between 10° to −10°, preferably at about 0° for the primarycutting edge portion 236. The rake angle is between −50° to −20° preferably −40° for the secondarycutting edge portion 238. Thus, the worked rake surfaces are substantially parallel to thelongitudinal axis 242. - 78. The rake faces 224 are formed by working, such as grinding or the like, into both sides of the
insert 218 and extend a desired distance from thecutting edge 220. The distance or depth which the rake faces 224, which are worked or ground into the insert, extend from the cutting edge is known as the length of relief. The depth of the length of relief is measured from thecutting edge 220 along thelongitudinal axis 242 to afirst egress surface 244. The length of relief of the rake faces 224 has a depth of about 0.08 to about 0.25 inch for a ¾ inch diameter bit. Preferably, the depth is from about 0.15 to about 0.25 inch. The length of relief can be defined as a ratio with respect to the diameter of the tool. Thus, the length of relief ratio is about 0.10 to about 0.32 inches per inch diameter of the tool. - 79. The
first egress surface 244 angles from the terminus or end of the length of relief. Thefirst egress surface 244 is generally angled with respect to therake face 224, providing an overall stepped cutting head, as seen in FIGS. 16 and 21. The angle of thefirst egress surface 244 is from about 30° to 90° and preferably 55° to 60° and may be continuous with and at the same angle as theegress area 228. - 80. The
clearance surface 226, which includes a portion of theinsert 218 and the cuttinghead 206 define a clearance angle CA. The clearance angle CA is defined as mentioned above. This clearance angle is from about 10° to about 50° and preferably about 20° to 40° for hammer and percussive tools and 30° to 50° for rotary only tools. - 81. A cutting angle β, as defined above, is defined between the
clearance face 226 and rakeface 224. The cutting angle β is from about 30° to 90° and preferably from about 40° to 60° for the primary cutting edge portion. The cutting angle for the secondary cutting edge portion varies from 60° to 120° preferably from 80° to 100°. These cutting angles define a primary cutting edge portion which enhances cutting action, while the cutting angle defined for the secondary cutting edge portion enhances the chiseling action of the cutting tool. - 82. The
egress area 228 defines an egress angle λ which is measured as mentioned above. Theegress area 228 is adjacent to thefirst egress surface 244. The angle is at least 0° and preferably from about 30° to 60° for hammer and percussive tools and at about −20° to 90° for rotary only tools, preferably about −20° to 20° for hammer and percussive tools and 45° to 105° for rotary only tools. Also, thefirst egress surface 244′ andegress area 228′ may be arcuate as seen in FIG. 28. Here they are shown on the same arc, however, they could be on different arcs. This egress angle and surface enhance the transport of debris from the tool tip into theflute 212 of theshank 208. Thus, by providing a desired egress angle, choking is prohibited at the cuttinghead 206. As seen in FIGS. 12 through 16, a larger volume of material is removed from the ball head enabling better debris removal. - 83. Turning to FIGS. 17 to 21, the double helix embodiment of the present invention is shown. The
cutting tool 300 includes achuck end 304 which is a rotary or percussive type of cutting tool end. Also, thehelixes flutes helixes egress area 328 andclearance surface 326 is due to a reduced amount of material present in the double helix design than is present in the single helix design. Otherwise, the angle parameters previously described are the same with the double helix design as they are with the single helix design. - 84. Turning to FIGS. 23 through 27, the cutting tools of the present invention are illustrated in concrete, aggregate or the like material, boring a hole. When the terms concrete, aggregate or the like material are used, the cutting tools may be used to bore, but are not limited to, cap block, brick, stone, ceramic materials, concrete, aggregate, black top, rock, cement, masonry or the like materials. In drilling a hole using rotary only motion, the bit of the present invention contacts the concrete, aggregate or the like material. The cutting tool may be rotated only where the rake face of the cutting tool cuts and bores a hole into the material. Alternatively, the cutting tool contacts the concrete, aggregate or the like material and impacts or chisels the material to form a hole. Further, the cutting tool may contact the material and impacting and rotating movement utilized together to bore a hole as seen in FIG. 27. Generally, the impacting is sequential and repetitious so that a constant repeating force is applied onto the cutting tool. Also, when the cutting tool is purely rotational, a constant force may be applied to the driver.
- 85.FIGS. 31 through 37 illustrate a double helix embodiment of the present invention. Cutting
tool 500 includes achuck end 504 which is a rotary or percussive type of cutting tool end. Also, thehelixes flutes helixes head 506, thus enabling the debris recesses 514 and 516 to include a larger volume of debris. - 86. The cutting
head 506 includes aninsert 518 which includes cuttingedges 520, rake faces 524 and clearance faces 526. Likewise, egress faces 528 are immediately adjacent therake face 524. - 87. The
insert 518 has an overall pentagonal shape of a house with thecutting edge 520 defining the roof, sides 530 and 532, and abase 534, which is substantially perpendicular to the twoparallel sides - 88. The
insert 518 is braised, welded or the like into the slot 522 on the cuttinghead 506. Theinsert 518 is generally manufactured from a carbide material such as a cobalt carbide mixture however, ceramic, ceramic composites, diamond dust, metal ceramic composites or a unitary homogeneous or a deposit of layers could be used. - 89. Cutting
edges 520 are defined by rake faces 524,edge radii 540 and clearance faces 526. The cutting edges 520 include aprimary cutting edge 536 and asecondary cutting edge 538. Theprimary cutting edge 536 is on an acute angle with respect to alongitudinal axis 542, while thesecondary cutting edge 538 is substantially perpendicular to thelongitudinal axis 542. The cutting edges 520 includeedge radius 540 between the rake faces 524 and clearance faces 526 as seen in FIG. 36. - 90. The
edge radius 540 defines a sharpness of the cutting tool. Anedge radius 540 of the present invention is between 0.0015 to 0.004 and preferably between 0.002 to 0.003. Having a desirededge radius 540 provides a desired sharpness to enable the cutting tool to cut through the concrete, aggregate or the like material during rotation of the cutting tool. The edge radius as mentioned above is formed during the powder pressing operation. - 91. The included angle between the two cutting edges is like those previously described. Also, the rake face angle α is between 10° and 0° preferably at about 5°. However, these angles are formed during the pressing operation. Also, the angles of the primary and secondary cutting edge are similar to those described above. The clearance angle CA as well as the cutting angle β are the same as those described above.
- 92. In this embodiment, a first egress surface is eliminated and an
egress area 528 is defined by an egress angle λ which is measured as mentioned above. Theegress area 528 is adjacent to therake face 524. The angle is between 80° and 100° and is preferably about 90°. - 93. For a better understanding of molding the insert, refer to FIGS. 38 through 41.
- 94. The
insert 518 is illustrated with aclearance face 526, rake faces 524 and a trailingface 525. Theland 533 is formed between theclearance face 524 and the trailingface 525. The width (X) of therake face 524, at the bottom of the insert, along thebase 534 is wider than the width (Y) of the trailingface 525 such that an angle B is formed along theland 533 with respect to thecentral axis 559. The line extending from theland 533 is on an angle which is counter clockwise away from the central axis. This angle enables the insert to be removed from the mold. - 95. Turning to FIG. 39, a mold and punch is illustrated. A V-shaped
punch 560 forms the roof of theinsert 518 and anejector pin 562, in themold 564, ejects the insert after it has been molded. Powdered metal is poured into themold 564 and thepunch 560 is inserted compressing the powder metal within themold 564. Upon compressing the powdered metal, as seen in FIG. 40, at the bottom of themold 564, theportion 568 of themold 564 forming therake face 524 extends inward from theportion 570 of themold 564 that forms the trailingface 525. At the top of themold 564, the width of the molds are substantially the same as seen in FIG. 41. Thus, when theinsert 518 is ejected from themold 564, since the bottom portion of therake face 524 is in an area as it exits the mold which is wider than the rake face base portion of theinsert 518, theinsert 518 is easily ejected from themold 564. However, if the angle B was clockwise with respect to thecentral axis 559, the land would be formed in the opposite direction and the insert would be jammed within the mold since the bottom of the insert would be wider than the width of the top of the mold. - 96. By having the
punch 560 move axially with respect to the insert, the desired rake faces 524 and clearance faces 526 as well as theedge radii 540 are formed on theinsert 518. The above identifiedinsert 518 forming is contrary to conventional molding of positive rake carbide inserts, which moves a punch laterally or perpendicular to the axis of the insert, to form the insert. - 97. To manufacture a cutting tool in accordance with the invention, ordinarily the tool would be made in methods consistent with those in the art. To provide a tip with surfaces like those disclosed, ordinarily the rake surfaces, egress surfaces and clearance surfaces would be ground or formed by other conventional means into the cutting tool to form the desired surfaces with desired angles.
- 98. While the above detailed description describes the preferred embodiment of the present invention, the invention is susceptible to modification, variation, and alteration without deviating from the scope and fair meaning of the subjoined claims.
Claims (29)
1. A cutting tool for boring concrete or the like material comprising:
a longitudinally extending shank portion defining a longitudinal axis having two ends;
a chucking part provided at one end of the shank portion;
a cutting head provided at the other end of said shank portion, a pressed powder cutting insert in said cutting head, a cutting edge on said cutting insert, said cutting edge having at least one cutting edge portion, a rake face, formed during said pressing of said powder, adjacent said cutting edge, said rake face being at a rake angle from about 0° to about 10°.
2. The cutting tool according to , wherein at least two cutting edge portions each include a rake surface.
claim 1
3. The cutting tool according to , wherein said rake face angle is preferably about 5°.
claim 1
4. The cutting tool according to , wherein said rake face angle is positive.
claim 1
5. A cutting tool for boring concrete or the like material comprising:
a longitudinally extending shank portion defining a longitudinal axis and having two ends;
a chucking part provided at one end of the shank portion;
a cutting head provided at the other end of said shank portion, a pressed powder cutting insert on said cutting head, a cutting edge on said cutting insert, said cutting edge including at least one cutting edge portion, a rake face formed adjacent said at least one cutting portion, a clearance face formed adjacent said at least one cutting portion opposing said rake face, said rake face and clearance face formed during pressing of the powder, and an edge radius between said rake face and clearance face, said edge radius having a radius of about 0.0015 to 0.004 inch.
6. The cutting tool according to , including at least two cutting edge portions, both cutting edge portions include a rake surface.
claim 11
7. The cutting tool according to , wherein said clearance face is at an angle of about 30° to about 40°.
claim 5
8. The cutting tool according to , wherein said edge radius is preferably from about 0.002 to about 0.003.
claim 5
9. The cutting tool according to , wherein an egress face is adjacent said rake face.
claim 5
10. The cutting tool according to , wherein said egress face is at an angle of about 80° to about 100°.
claim 9
11. The cutting tool according to , wherein said egress face is at an angle of about 90°.
claim 10
12. A cutting tool for concrete, aggregate or the like material comprising:
a longitudinally extending shank portion defining a longitudinal axis and having two ends;
a chucking part provided at one end of the shank portion;
a cutting head provided at the other end of said shank portion, a pressed powder cutting insert in said cutting head, a cutting edge formed on said cutting insert, said cutting edge having at least one cutting edge portion, a rake surface formed adjacent said cutting edge during pressing of the powder, said rake surface being at a positive rake angle.
13. A method of boring a hole in concrete, aggregate or the like material comprising:
providing a cutting tool including a longitudinally extending shank portion defining a longitudinal axis and having two ends, a chucking part provided at one end of the shank portion, a cutting head provided at the other end of said shank portion, a pressed powder cutting insert in said cutting head, a cutting edge on said cutting insert, said cutting edge having at least one cutting edge portion, a rake surface formed adjacent said cutting edge portion, said rake face being at a rake angle from about 0° to about 10°;
contacting said cutting edge with the material;
rotating said cutting tool to cut said material; and
forming a hole in said material.
14. The method of , including applying a force along said longitudinal axis of said cutting tool.
claim 13
15. The method of , wherein said force is constant.
claim 14
16. The method of , wherein said force is sequentially repetitious to impact the material to chisel the material.
claim 14
17. A method of boring a hole in concrete, aggregate or the like material comprising:
providing a cutting tool including a longitudinally extending shank portion defining a longitudinal axis and having two ends, a chucking part provided at one end of the shank portion, a cutting head provided at the other end of said shank portion, a pressed powder cutting insert in said cutting head, a cutting edge on said cutting insert, said cutting edge having at least one cutting edge portion, a rake surface formed adjacent said cutting edge portion, said rake face being at a rake angle from about 0° to about 10°;
contacting said cutting edge with the material;
impacting said cutting tool to chisel said material; and
forming a hole in said material.
18. The method of , including rotating said cutting tool to cut the material.
claim 17
19. A method of boring a hole in concrete, aggregate or the like material comprising:
providing a cutting tool including a longitudinally extending shank portion defining a longitudinal axis and having two ends, a chucking part provided at one end of the shank portion, a cutting head provided at the other end of said shank portion, a pressed powder cutting insert in said cutting head, a cutting edge on said cutting insert, said cutting edge including at least one cutting edge portion, a rake surface formed adjacent said at least one cutting portion, a clearance face formed adjacent said at least one cutting portion opposing said rake face, and an edge radius between said rake face and clearance face, said edge radius of from about 0.0015 to 0.004 inch;
contacting said cutting edge with the material;
rotating said cutting tool to cut said material; and
forming a hole in said material.
20. The method of , including applying a force along said longitudinal axis of said cutting tool.
claim 19
21. The method of , wherein said force is constant.
claim 20
22. The method of , wherein said force is sequentially repetitious to impact the material to chisel the material.
claim 21
23. A method of boring a hole in concrete, aggregate or the like material comprising:
providing a cutting tool including a longitudinally extending shank portion defining a longitudinal axis and having two ends, a chucking part provided at one end of the shank portion, a cutting head provided at the other end of said shank portion, a pressed powder cutting insert in said cutting head, a cutting edge on said cutting insert, said cutting edge including at least one cutting edge portion, a rake surface formed adjacent said at least one cutting portion, a clearance face formed adjacent said at least one cutting portion opposing said rake face, and an edge radius between said rake face and clearance face, said edge radius having a radius of from about 0.0015 to 0.004 inch;
contacting said cutting edge with the material;
impacting said cutting tool to chisel said material; and
forming a hole in said material.
24. The method of , including rotating said cutting tool to cut the material.
claim 23
25. A method of forming an insert comprising:
providing a mold with an insert cavity defining a longitudinal axis and having an opening along the longitudinal axis;
adding powder material into the mold;
compressing the material in the direction of the longitudinal axis;
forming the insert with a positive rake face.
26. The method of forming an insert according to further comprising a V-shaped punch compressing said powder material.
claim 25
27. The method of forming an insert according to and forming a land on a face of said insert, said land being at an acute angle and counter clockwise with respect to an axis of the insert.
claim 25
28. The method of forming an insert according to , wherein said insert has a desired rake face, clearance face and edge radius.
claim 25
29. The method of forming an insert according to and ejecting the insert from the mold.
claim 25
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/727,026 US20010000223A1 (en) | 1994-12-12 | 2000-11-30 | Cutting tools for drilling concrete, aggregate, masonry or the like materials |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US35434994A | 1994-12-12 | 1994-12-12 | |
US51358695A | 1995-08-10 | 1995-08-10 | |
US84552497A | 1997-04-25 | 1997-04-25 | |
US09/727,026 US20010000223A1 (en) | 1994-12-12 | 2000-11-30 | Cutting tools for drilling concrete, aggregate, masonry or the like materials |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US84552497A Continuation | 1994-12-12 | 1997-04-25 |
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US09/727,026 Abandoned US20010000223A1 (en) | 1994-12-12 | 2000-11-30 | Cutting tools for drilling concrete, aggregate, masonry or the like materials |
US10/011,138 Abandoned US20020054799A1 (en) | 1994-12-12 | 2001-11-13 | Cutting tools for drilling concrete, aggregate, masonry or the like materials |
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US08/747,695 Expired - Lifetime US5918105A (en) | 1994-12-12 | 1996-11-12 | Cutting tools for drilling concrete, aggregate, masonry or the like materials |
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US10/011,138 Abandoned US20020054799A1 (en) | 1994-12-12 | 2001-11-13 | Cutting tools for drilling concrete, aggregate, masonry or the like materials |
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DE8337306U1 (en) * | 1983-12-24 | 1984-04-05 | Zitterbart, Heinz, 3436 Hessisch Lichtenau | SPIRAL DRILL FOR A HAND DRILLING MACHINE, ESPECIALLY FOR DRILLING STONE, MARBLE, ARTIFICIAL STONE OR THE LIKE. |
DE3426977A1 (en) * | 1984-07-21 | 1986-01-30 | Hawera Probst Gmbh + Co, 7980 Ravensburg | ROCK DRILL |
DE3500202A1 (en) * | 1985-01-05 | 1986-07-10 | Hawera Probst Gmbh + Co, 7980 Ravensburg | DRILLING TOOLS |
DE3544433C2 (en) * | 1985-12-16 | 1995-12-14 | Hilti Ag | Rock drill |
DE3621414A1 (en) * | 1986-06-26 | 1988-01-07 | Hawera Probst Kg Hartmetall | DRILLING TOOL |
CA1324013C (en) * | 1987-02-09 | 1993-11-09 | Vermont American Corporation | Masonary drill tip with strong and chamfered cutting edges |
US4984944A (en) * | 1987-02-09 | 1991-01-15 | Vermont American Corporation | Drill bit blade for masonry and rock drill |
DE3707798A1 (en) * | 1987-03-11 | 1988-09-22 | Hawera Probst Kg Hartmetall | ROCK DRILL |
SE457334B (en) * | 1987-04-10 | 1988-12-19 | Ekerot Sven Torbjoern | DRILL |
DE3713334A1 (en) * | 1987-04-21 | 1988-11-03 | Krupp Gmbh | PRESSING TOOL AND CUTTING INSERT SEMINATED FROM A GRUENLING THEREFORE |
US4817742A (en) * | 1987-08-11 | 1989-04-04 | Kennametal Inc. | Butterfly-type shim having perforations in mid-section thereof and double sandwich braze joint produced therewith |
DE3742661A1 (en) * | 1987-12-16 | 1989-07-13 | Hawera Probst Kg Hartmetall | ROCK DRILL |
DE3813849A1 (en) * | 1988-04-23 | 1989-11-02 | Hawera Probst Kg Hartmetall | ROCK DRILL |
DE3820695C2 (en) * | 1988-06-18 | 1996-07-25 | Hawera Probst Kg Hartmetall | Rock drill |
JPH0215908A (en) * | 1988-07-04 | 1990-01-19 | Toshiaki Hosoi | Drill and its grinding method and device |
DE3834675A1 (en) * | 1988-10-12 | 1990-04-19 | Hawera Probst Kg Hartmetall | DRILLING TOOL |
US4976325A (en) * | 1989-06-02 | 1990-12-11 | Carolina Twist Drill, Inc. | Fluted cutting tool and method of producing same |
US4979984A (en) * | 1990-03-16 | 1990-12-25 | Inserts Ltd. | Process for the manufacture of an insert |
US5265688A (en) * | 1990-04-09 | 1993-11-30 | Hilti Aktiengesellschaft | Rock drill |
US5172775A (en) * | 1991-03-06 | 1992-12-22 | Kennametal Inc. | Rotary drill bit insert |
DE4114271A1 (en) * | 1991-05-02 | 1992-11-05 | Hilti Ag | DRILLING AND CHISELING TOOL WITH BASIC BODY AND CUTTING BODY |
GB2260283A (en) | 1991-10-03 | 1993-04-14 | Paul Mark Souber | Drill bit |
SE502255C2 (en) * | 1991-12-16 | 1995-09-25 | Sandvik Ab | Drill with chip channels, comprising a first and a second chip feeding zone, of different cross sections |
US5269387A (en) * | 1992-02-27 | 1993-12-14 | Tungco, Incorporated | Insert for mine roof tool bit |
US5350261A (en) * | 1992-03-12 | 1994-09-27 | Mitsubishi Materials Corporation | Twist drill |
SE507842C2 (en) * | 1992-09-24 | 1998-07-20 | Sandvik Ab | Drill |
US5375672A (en) * | 1992-10-22 | 1994-12-27 | Sandvik Rock Tools, Inc. | Mine roof drill bit and cutting insert therefor |
US5433281A (en) * | 1994-07-25 | 1995-07-18 | Black; Stanton | Roof drill bit tip |
-
1996
- 1996-11-12 US US08/747,695 patent/US5918105A/en not_active Expired - Lifetime
-
2000
- 2000-11-30 US US09/727,026 patent/US20010000223A1/en not_active Abandoned
-
2001
- 2001-11-13 US US10/011,138 patent/US20020054799A1/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050089383A1 (en) * | 2003-10-01 | 2005-04-28 | Nordlin William F. | Deburring tool |
US7150589B2 (en) | 2003-10-01 | 2006-12-19 | Greenlee Textron Inc. | Deburring tool |
Also Published As
Publication number | Publication date |
---|---|
US5918105A (en) | 1999-06-29 |
US20020054799A1 (en) | 2002-05-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |