WO2019050823A1 - Trépan - Google Patents

Trépan Download PDF

Info

Publication number
WO2019050823A1
WO2019050823A1 PCT/US2018/049320 US2018049320W WO2019050823A1 WO 2019050823 A1 WO2019050823 A1 WO 2019050823A1 US 2018049320 W US2018049320 W US 2018049320W WO 2019050823 A1 WO2019050823 A1 WO 2019050823A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
drill bit
edge surface
outer edge
cutting tip
Prior art date
Application number
PCT/US2018/049320
Other languages
English (en)
Inventor
Max R. SAWA
Original Assignee
Milwaukee Electric Tool Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Milwaukee Electric Tool Corporation filed Critical Milwaukee Electric Tool Corporation
Publication of WO2019050823A1 publication Critical patent/WO2019050823A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0426—Drills for trepanning with centering devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/08—Drills combined with tool parts or tools for performing additional working
    • 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

Definitions

  • the present invention relates to drill bits.
  • Drill bits are generally used with power tools such as hole saws, rotary drills, or hammer-type drills to cut or carve holes into a material or surface.
  • Multi-material drill bits are used to cut holes into a variety of materials such as brick, block, tile, metal, marble, concrete, plaster, wood, plastic, dry-wall, etc., or any combination thereof.
  • Multi-material drill bits need to be versatile, but also need to be durable to withstand drilling in abrasive materials.
  • a drill bit may be used as a pilot bit for a hole saw.
  • the pilot bit helps grab a workpiece quickly when the cutting operation starts, which inhibits the hole saw from "walking" away from the desired hole location.
  • Some pilot bits include cutting tips, the cutting tips typically have opposing faces that are parallel and planar. These cutting tips, however, do not cut cleanly through a workpiece. Instead, the cutting tips tend to grind the workpiece, forming unclean holes with exposed cutting chips around the pilot bits. The cutting tips tend to get stuck in the unclean holes, making plug removal from the hole difficult.
  • U.S. Patent No. 6,959,775 discloses a hammer drill having a plate-like cutting member with two
  • the invention provides a drill bit assembly including a drill bit having a first end, a second end opposite the first end, an axis of rotation extending centrally through the drill bit between the first and second ends, a shank disposed at the first end, and a flute.
  • the drill bit assembly also includes a cutting tip coupled to the second end of the drill bit.
  • the cutting tip includes a cutting edge, a first outer edge surface adjacent the cutting edge, a second outer edge surface opposite the first outer edge surface, and a single reduced width section adjacent formed in the cutting tip. The single reduced width section is positioned adjacent the first outer edge.
  • the invention provides a cutting tip for use with a drill bit.
  • the cutting tip includes an upper edge surface, a lower edge surface opposite the upper edge surface, a first outer edge surface, and a second outer edge surface opposite the first outer edge surface.
  • the second outer edge surface defines a first cutting edge.
  • the cutting tip also includes a front face extending from the upper edge surface to the lower edge surface and extending from the first outer edge surface to the second outer edge surface.
  • the cutting tip further includes a rear face opposite the front face. The rear face extends from the upper edge surface to the lower edge surface and extends from the first outer edge surface to the second outer edge surface.
  • the cutting tip also includes a single reduced width section formed in the front face. The reduced width section is positioned adjacent the first outer edge surface. The reduced width section defines a second cutting edge on the first outer edge surface.
  • the invention provides a cutting assembly including a hole saw having a cylindrical body with a cutting edge formed along one end of the body and an end cap coupled to an opposite end of the body.
  • the cutting assembly also includes a drill bit having a first end, a second end opposite the first end, an axis of rotation extending centrally through the drill bit between the first and second ends, a shank disposed at the first end, and a helically wound flute.
  • the cutting assembly further includes a cutting tip coupled to the second end of the drill bit.
  • the cutting tip includes a cutting edge, a first outer edge surface adjacent the cutting edge, a second outer edge surface opposite the first outer edge surface, and a single reduced width section formed in the cutting tip. The single reduced width section is positioned adjacent the first outer edge.
  • Fig. 1 is a perspective view of a hole saw.
  • Fig. 2 is a side view of a drill bit assembly, the drill bit assembly including a drill bit and a cutting tip.
  • Fig. 3 is an exploded side view of the drill bit assembly.
  • Fig. 4 is a perspective view of the cutting tip.
  • Fig. 5 is a top view of the cutting tip.
  • Fig. 6 is a front view of the cutting tip.
  • Fig. 7 is a side view of the cutting tip.
  • Fig. 8 is a top view of an alternative cutting tip for use with the drill bit assembly.
  • Fig. 1 illustrates a hole saw 10.
  • the hole saw 10 includes a generally cylindrical body 14 having a cutting edge 18 formed along one end of the body 14 and an end cap 22 coupled to an opposite end of the body 14.
  • the illustrated cutting edge 18 is formed by a plurality of teeth and gullets, but may alternatively have other configurations.
  • Figs. 2 and 3 illustrate a drill bit assembly 26.
  • the drill bit assembly 26 is used as a pilot bit for use with the hole saw 10.
  • the drill bit assembly 26 is a multi-material drill bit that can drill holes in a variety of materials such as brick, block, tile, metal, marble, concrete, plaster, wood, plastic, dry-wall, etc., or any combination thereof.
  • the illustrated drill bit assembly 26 includes a drill bit 30 and a cutting tip 34.
  • the drill bit 30 is a twist bit with a first end 31 , a second end 32 opposite the first end 31, and a body 33 between the first and second ends 31, 32.
  • the drill bit 30 includes a shank 35 disposed at the first end 31 and configured to couple to a power tool.
  • the drill bit 30 also includes a pair of flutes 36 helically wrapped around the body 33. In some embodiments, the drill bit 30 may only include one flute 36.
  • the drill bit 30 defines an axis of rotation 37 that extends centrally through the drill bit 30 between the first and second ends 31, 32. During operation, the drill bit 30 is configured to rotate counterclockwise (as viewed from FIGS. 2 and 3) about the axis of rotation 37.
  • the cutting tip 34 is coupled to the second end 32 of the drill bit 30. In the illustrated embodiment, the cutting tip 34 is received in a slot 25 formed in the end of the drill bit 30 and secured in place. In some embodiments, the cutting tip 34 may be braised, welded, or secured to the drill bit 30 using other suitable means.
  • the cutting tip 34 may be formed of carbide. In other embodiments, the cutting tip 34 may be formed of high speed steel or any other suitable hard metals. In some embodiments, the cutting tip 34 may be composed of metal formed by a suitable process (e.g., molding, 3D printing, forging, etc.). In further embodiments, the cutting tip 34 may be integral with the drill bit 30.
  • the cutting tip 34 has an upper edge surface 38, a lower edge surface 42, first and second opposing outer edge surfaces 46, 48 extending between the upper and lower edge surfaces 38, 42, a front face 50, and a rear face 52 on an opposing side of the cutting tip 34 from the front face 50.
  • the upper edge surface 38 forms a cutting edge of the cutting tip 34.
  • the lower edge surface 42 is received in the slot 25 of the drill bit 30.
  • the illustrated cutting tip 34 also has a single reduced width section 54.
  • the single reduced width section 54 is the only reduced width section formed in the cutting tip 34.
  • the reduced width section 54 is formed in the front face 50 adjacent the first outer edge surface 46.
  • the reduced width section 54 extends from the upper edge surface 38 to the lower edge surface 42. In other embodiments, the reduced width section 54 may not extend fully between the upper edge surface 38 and the lower edge surface 42. For example, the reduced width section 54 may extend halfway down the face 50 from the upper edge surface 38 to create half the depth.
  • the reduced width section 54 allows the first outer edge surface 46 to act as a cutting edge such that the cutting tip 34 is able to cleanly cut through a workpiece. In other words, the first outer edge surface 46 and the reduced width section 54 form a cutting edge 59.
  • the rear face 52 includes a cutting edge 55 adjacent the second outer edge surface 48 of the cutting tip 34. In the illustrated embodiment, the cutting edge 55 is a blunt cutting edge for which the second outer edge surface 48 is a relief surface.
  • the reduced width section 54 is formed as a scallop or radiused surface in the front face 50 and includes an internal edge 56 radially closer to the axis of rotation and an outer edge 58 closer to the first outer edge surface 46.
  • the reduced width section 54 may be formed by other planar or non-planar surfaces in the faces 50, 52 of the cutting tip 34.
  • the surface forming the reduced width section 54 extends inward from the front face 50, reducing the width of the cutting tip 34 and creating the relatively sharp cutting edge 59.
  • a flat face 60 is positioned between the outer edge 58 and the cutting edge 59.
  • the face 60 may be ground stock to form a curved face 60 that increases the durability of the cutting edge 59.
  • the face 60 can be ground down so that the outer edge 58 and the cutting edge 59 are congruent, which improves the drill bits wood cutting ability.
  • the outer edge 58 and the cutting edge 59 form a continuous, planar surface that can be considered the same surface.
  • the cutting edge 58 can include a rake that extends past the planar face 50 of the cutting tip 34.
  • the cutting tip 34 has a first width Wl measured at the first outer edge surface 46, a second width W2 that is less than the first width Wl measured radially inward from the first width Wl at the reduced width section 54 between the front and rear faces 50, 52, and a third width W3 that is greater than the second width W2 measured radially inward from the second width W2.
  • the third width W3 may be equal to or greater than the first width Wl . In other embodiments, the third width W3 may be less than the first width Wl .
  • the cutting tip 34 also has a length L defined between the cutting edges 55, 59.
  • the length L is greater than a diameter of the drill bit 30 such that the cutting edges 55, 59 formed by the outer edge surfaces 46, 48 extend radially further outward from the axis of rotation 37 than the outer surface of the drill bit 30 (as shown in Fig. 3).
  • This arrangement allows the cutting tip 34 to cut a larger diameter hole in a workpiece than the drill bit 30, which allows for easier plug removal on a hole saw and better chip ejection on a drill bit.
  • the internal edge 56 of the reduced width section 54 is positioned a distance D from the first outer edge surface 46.
  • the distance D is approximately 25% of the tip diameter or 25% of the length L. In other embodiments, the distance D can be within a range from approximately 10% to 60% of the length L.
  • the distance D can vary to change the effectiveness of the reduced width section 54. For example, by decreasing the distance D, the reduced width section 54 becomes more durable but is less able to remove cutting chips, causing difficult hole removal. Alternatively, by increasing the distance D, the reduced width section 54 becomes less durable, but increases cutting chip removal for a cleaner hole.
  • Fig. 8 illustrates another cutting tip 34' for use with the drill bit 30.
  • a reduced width section 54' includes a flat section 62' that extends from the center of the reduced width section 54' to the first outer edge surface 46' forming a point 66'.
  • the flat section 62' allows for more reliable and reproducible manufacturing of the cutting tip 34' .
  • the point 66' can be ground into the cutting tip 34' after the reduced width section 54' is formed.
  • the reduced width section 54, 54' in the cutting tip 34, 34' provides better durability than a cutting tip having multiple reduced width sections or recesses.
  • the cutting tip 34, 34' maintains at least one blunt edge that is useful for when the drill bit is used on more abrasive materials. In other words, maintaining a blunt edge also increases the durability of the cutting tip 34, 34' .
  • the drill bit 30 can be used to cut more holes before the cutting tip 34, 34' becomes worn or fractures.
  • the single reduced width section 54, 54' provides a cleaner cut. Further, when used as a pilot bit on a hole saw, the cutting tip 34, 34' provides easier plug removal from the hole saw 10 compared to a cutting tip without any reduced width sections or recesses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un ensemble formant trépan comprenant un trépan ayant une première extrémité, une deuxième extrémité opposée à la première extrémité, un axe de rotation s'étendant de manière centrale au travers du trépan entre les première et deuxième extrémités, une tige disposée au niveau de la première extrémité, et une goujure. L'ensemble formant trépan comprend également une tête de coupe couplée à la deuxième extrémité du trépan. La tête de coupe comprend un bord de coupe, une première surface de bord externe adjacente par rapport au bord de coupe, une deuxième surface de bord externe opposée à la première surface de bord externe, et une section de largeur réduite unique formée dans la tête de coupe. La section à largeur réduite unique est positionnée de manière adjacente par rapport au premier bord externe.
PCT/US2018/049320 2017-09-05 2018-09-04 Trépan WO2019050823A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762554324P 2017-09-05 2017-09-05
US62/554,324 2017-09-05

Publications (1)

Publication Number Publication Date
WO2019050823A1 true WO2019050823A1 (fr) 2019-03-14

Family

ID=65634354

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/049320 WO2019050823A1 (fr) 2017-09-05 2018-09-04 Trépan

Country Status (1)

Country Link
WO (1) WO2019050823A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6021857A (en) * 1996-09-21 2000-02-08 Black & Decker Inc. Drill bit
US20030039522A1 (en) * 2001-07-10 2003-02-27 Kazuya Yanagida Drill
US20070104548A1 (en) * 2005-11-07 2007-05-10 Markus Rompel Hole saw having a drill bit with a pilot tip
CN101780553A (zh) * 2009-01-15 2010-07-21 株式会社钨钛合金 钻头及其磨削加工方法
US20140023447A1 (en) * 2012-07-18 2014-01-23 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6021857A (en) * 1996-09-21 2000-02-08 Black & Decker Inc. Drill bit
US20030039522A1 (en) * 2001-07-10 2003-02-27 Kazuya Yanagida Drill
US20070104548A1 (en) * 2005-11-07 2007-05-10 Markus Rompel Hole saw having a drill bit with a pilot tip
CN101780553A (zh) * 2009-01-15 2010-07-21 株式会社钨钛合金 钻头及其磨削加工方法
US20140023447A1 (en) * 2012-07-18 2014-01-23 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw

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