Classifications

• • 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
  • B23B2251/00—Details of tools for drilling machines
  • B23B2251/12—Cross sectional views of the cutting edges
  • B23B2251/125—Rounded 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
  • B23B2251/46—Drills having a centre free from cutting edges or with recessed cutting edges
• • 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
• • 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
• • 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 invention relates to a drilling tool for introducing holes in Vietnameseplane surfaces, in particular cylindrical hollow body.
• the drilling tool does not lie flush with its drill bit arranged on the front side and breaks laterally during drilling or runs laterally.
• This problem is aggravated when two hollow-cylindrical elements are inserted into one another and the bore is intended to penetrate the overlapping area of the hollow-cylindrical elements.
• the tool initially penetrates through the outer wall into the wall of the outer body and leaves it again on its inner wall, to push immediately on the outer surface of the wall of the inner hollow cylindrical part.
• This risk can be further increased by the fact that the wall thickness of the hollow cylindrical wall is not constant in itself, but decreasing to one side.
• the invention is therefore based on the object to design a drilling tool so that it does not break even when drilling operations on non-planar or non-planar surfaces, so that holes can be made with high dimensional and shape retention with the drilling tool.
• a drilling tool is provided with at least two to the central longitudinal axis of the tool shank extending at right angles cutting edges. These two cutting edges form the drill main cutting edge. Between the sub-cutting a recessed in the direction of the drill shaft clearance is arranged. The drill shaft is thus provided with a recess in the region of the center of its end face forming the drill bit.
• the invention is thus based on the basic idea not to use a centering tip arranged in the center of the drill bit end face for centering the drilling tool. Rather, the centering of the drilling tool according to the invention takes place over the arranged at the edge regions of the front side cutting edges and the central franking.
• the partial cutting edges viewed from the edge of the end face of the tool, initially run at right angles to the central longitudinal axis.
• a non-cutting central region is arranged between these obliquely placed, the franking associated partial cutting areas, which as it forms the franking floor. It is particularly advantageous to design the transitions within the partial cutting edges in the form of radii to be particularly soft and almost fluent in one another. This is particularly well possible with a concave indentation in the front of the tool as a clearing.
• the edge region of the end face is provided with a broad chamfer connecting the front side and the peripheral surface.
• the transitions between the front side and the chamfer and the chamfer and in turn the chamfer and the peripheral surface of the tool are preferably designed as sliding radii.
• the transitions between the cutting edges and the adjacent chip and / or open surfaces are advantageously configured as radii in order to produce smooth and continuous transitions in the tool.
• the drilling tool has flutes molded into its peripheral surface.
• the adjacent to the cutting edges groove edges of the flutes are formed here as a minor cutting.
• each secondary cutting edge has a guide bevel and a guide bevel trailing the guide bevel.
• the cutting edges of the main cutting edge and the secondary cutting edge have rounded edges.
• the surfaces of the tool, in particular the surfaces of the flutes must be polished.
• the polished flutes effectively prevent sticking of the dissipated chips in the flutes.
• the tool may still be completely or partially coated.
• the shank of the drilling tool can also be penetrated by one or more coolant bores or cooling channels.
• the tip of the provided with radii transitions provided drilling tool is in particular a grinding method according to EP-B-1 230 058th
• FIG. 1 shows a side view of a drilling tool according to the invention
• Fig. 2 shows a plan view of the front side of the inventive drilling tool
• Fig. 3 shows the drill bit of the drilling tool according to circle IM in Fig. 1 in an enlarged view.
• the drilling tool 1 consists of a tool shaft 3 which is rotationally symmetrical with respect to its central longitudinal axis 2.
• the tool shaft 3 is divided in two into a tool receiving area 4 which is thicker in diameter and an effective area 5 with a smaller diameter.
• the tool receiving area 4 merges into the effective area 5 via the conically configured transition area 6.
• the tool shank 3 is cylindrical in the tool receiving area 4 and has a smooth clamping surface 7. With its tool receiving area 4 of the tool shank 3 is clamped in the chuck of a machine tool. The clamping jaws of the machine tool act on the clamping surface 7.
• the effective region 5 of the drilling tool 1 has a coiled flute 8 and a likewise coiled nut back 9.
• the drill tip is shown in Fig. 1 in the circle IM and is further explained with reference to the enlarged view in FIG.
• the two partial cutting edges 10 run at right angles to the central longitudinal axis 2.
• a trough-shaped concave indentation tapering in the direction of the central longitudinal axis 2 is provided as franking 11.
• the cutting edges 10 go into the franking 11 flowing over radii 12 over.
• a portion of the franking 11 is effective in the cutting process as the main cutting edge.
• Each edge of the cutting edges 10 is followed by a bevel 13 at.
• the chamfer 13 in each case forms the transition from a partial cutting edge 10 of the drill face to the peripheral surface 14 of the drilling tool 1.
• the secondary cutting edges 15 each have a guide chamfer 16 and a trailing support chamfer 17.
• the core of the drilling tool 1 is finally penetrated in the direction of the central longitudinal axis of two coolant channels 18.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=43430885

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Family Cites Families (41)

• 2009
  • 2009-08-27 DE DE102009039170.3A patent/DE102009039170B4/de not_active Expired - Fee Related
• 2010
  • 2010-08-10 KR KR20127003959A patent/KR20120066625A/ko not_active Application Discontinuation
  • 2010-08-10 US US13/392,294 patent/US9085033B2/en active Active
  • 2010-08-10 JP JP2012525901A patent/JP2013503045A/ja active Pending
  • 2010-08-10 BR BR112012002986A patent/BR112012002986A2/pt not_active IP Right Cessation
  • 2010-08-10 CN CN201080036439.XA patent/CN102470453B/zh not_active Expired - Fee Related
  • 2010-08-10 EP EP10767918A patent/EP2470322A1/de not_active Withdrawn
  • 2010-08-10 WO PCT/EP2010/004876 patent/WO2011023288A1/de active Application Filing
  • 2010-08-10 CA CA 2770577 patent/CA2770577A1/en not_active Abandoned

Non-Patent Citations (1)

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