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EP4429838A1 - Outil combiné de perçage et d'ébavurage - Google Patents

Outil combiné de perçage et d'ébavurage

Info

Publication number
EP4429838A1
EP4429838A1 EP22818614.4A EP22818614A EP4429838A1 EP 4429838 A1 EP4429838 A1 EP 4429838A1 EP 22818614 A EP22818614 A EP 22818614A EP 4429838 A1 EP4429838 A1 EP 4429838A1
Authority
EP
European Patent Office
Prior art keywords
tool
drilling
peeling
impact
hole
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.)
Pending
Application number
EP22818614.4A
Other languages
German (de)
English (en)
Inventor
Peter Kopton
Attila Bugár
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Audi AG
Audi Hungaria Kft
Original Assignee
Audi AG
Audi Hungaria Kft
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 Audi AG, Audi Hungaria Kft filed Critical Audi AG
Publication of EP4429838A1 publication Critical patent/EP4429838A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/08—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
    • B23B51/00—Tools for drilling machines
    • B23B51/10—Bits for countersinking
    • B23B51/101—Deburring tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/10—Bits for countersinking
    • B23B51/108—Bits for countersinking having a centering drill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2220/00—Details of turning, boring or drilling processes
    • B23B2220/08—Deburring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D13/00—Tools or tool holders specially designed for planing or slotting machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
    • B23D79/02—Machines or devices for scraping
    • B23D79/04—Machines or devices for scraping with rotating cutting-tool, e.g. for smoothing linings of bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D81/00—Methods, machines, or devices for working metal, covered by more than one main group in this subclass

Definitions

  • the invention relates to a combination tool for drilling a workpiece through-hole in a workpiece without a pilot hole and for deburring a hole edge facing away from the tool.
  • the invention also relates to a method for drilling and deburring a workpiece through-hole according to claim 7 or
  • a drilling tool is driven into a workpiece without a pre-drilled hole with one stroke and at one drilling speed until the workpiece surface facing away from the tool breaks through.
  • a burr may occur on the edge of the through hole facing away from the tool. The burr can detach from the edge of the hole at a later point in time and possibly lead to malfunctions.
  • a generic combination tool can be used both for drilling a workpiece through hole in a workpiece without a pre-drilled hole and for deburring a hole edge facing away from the tool.
  • the combination tool has at least one pre-drilling cutting edge having a smaller pre-drilling diameter and at least one peeling cutting edge having a larger target drilling diameter.
  • the pilot cutting edge extends from the tool tip over a Length of cutting edge axially in the direction of the tool shank.
  • the peeling cutting edge adjoins the pilot drilling cutting edge axially in the direction of the tool shank.
  • DE 4121695 A1 discloses a combination countersink for producing deburred bores.
  • a drill for drilling and deburring is known from DE 2550905 A1.
  • Further drilling tools for drilling and deburring are known from DE 102019109916 A1 and from WO 2018/197364 A1.
  • the object of the invention is to provide a combination tool with which, in a process-technically simple manner, both drilling of a workpiece through hole and deburring of a hole edge remote from the tool is made possible.
  • the object is solved by the features of claim 1, 7 or 8.
  • Preferred developments of the invention are disclosed in the dependent claims.
  • the invention is based on a combination tool for drilling a workpiece through hole in a workpiece without a pilot hole and for deburring a hole edge remote from the tool.
  • the combination tool has at least one pre-drilling cutting edge with a smaller pre-drilling diameter, which extends axially from the tool tip over a cutting edge length in the direction of the tool shank.
  • the peeling edge has a slotted edge on its end face facing the tool tip.
  • a chip space can be located in front of the impact cutting edge in the direction of the tool tip, in which impact chips can collect during a impact stroke of the combination tool, which will be described later.
  • the course of the longitudinal cutting edge is interrupted at the chip space. That means the chip space divides the longitudinal cutting edge into the pre-drilling cutting edge at the tool tip and the peeling cutting edge on the shank.
  • a drilling/deburring process can be carried out using the combination tool according to the invention, which has the following process steps: First, in a pre-drilling step, the combination tool is driven into the workpiece with a pre-drilling stroke and a pre-drilling speed. In addition, at the end of the advance stroke, the paring cutting edge is located completely inside the bore and offset by an axial offset to the edge of the bore facing away from the tool. After the end of the pre-drilling stroke, there is an impact step in which the combination tool is driven through the material allowance of the inner wall of the pilot hole with an impact stroke. This creates a slot in the material oversize across the axial offset, which pierces the workpiece surface facing away from the tool.
  • a peeling step is carried out, in which the combination tool is operated at a peeling speed.
  • the scraping blade can scrape off the remaining material allowance in the inner wall of the pilot hole.
  • the edge of the hole facing away from the tool is deburred in the peeling step.
  • the cutting edge can have a groove base cutting edge as well as groove side cutting edges. With the aid of the cutting edges of the groove flanks of the shaping blade, groove flanks are formed in the shaping step, which are raised radially inwards from the groove base. The cutting edge, and in particular its cutting edge at the bottom of the groove, lies on a target drill diameter.
  • the combination tool is guided to a reversal point in which the peeling blade is at least partially positioned within the impact groove.
  • the peeling step is performed immediately after the impact stroke end.
  • the combination tool can be operated without feed, i.e. only at the peeling speed, in the peeling step. In this case, the peeling blade positioned in the impact groove is brought into peeling contact with the material allowance, in particular in peeling contact with an impact groove flank upstream in the direction of rotation.
  • the combination tool in the peeling step, can be operated both with peeling speed and with a reverse feed. In this case, a burr on the edge of the hole can be drawn inwards and thereby deburred.
  • a reversing step is carried out, in which the combination tool is guided out of the finished workpiece through hole in the reversing direction.
  • the combination tool can be moved coaxially to the bore axis in all process steps, ie pre-drilling step, impact step, peeling step and reversing step.
  • the peeling cutting edge is not arranged in axial alignment with the tool axis, but rather runs helically or helically around the tool axis is carried out. In this way, a helical or helical impact groove is produced in the inner wall of the pilot hole, in which the helical peeling cutting edge is guided without any load during the impact stroke.
  • the slope of the skiving blade and the slope of the impact groove are not identical. Rather, the peeling edge pitch can be reduced in comparison to the butt groove pitch.
  • the combination tool has a clamping shank that merges into a drill body.
  • the drill body can be designed with at least one drill bar. This can run in axial alignment with the tool axis or helically or helically from the tool tip to the clamping shank.
  • FIG. 1 a combination tool on its own; 2a to 2e are views illustrating a drilling/deburring process according to a first embodiment; 3 shows a detail of a development of the inner wall of the pilot hole with a flute in which the peeling blade is arranged; Figs.
  • FIGS. 6a to 6d show a development according to the fourth exemplary embodiment in a view corresponding to FIG.
  • FIG. 1 shows a combination tool for producing a workpiece through hole 39 (FIG. 2e).
  • the combination tool has a clamping shank 1 which merges into a drill body 3 .
  • the drill body 3 is designed with a drill web 7 running helically or helically from a tool tip 5 to the clamping shank 1 .
  • a flute 9 which also extends helically from the tool tip 5 to the clamping shank 1 .
  • a flute surface delimiting the flute 9 and a drill bar rear surface converge at a longitudinal cutting edge 11 which likewise runs helically or helically along the tool axis A analogous to the drill bar 7 .
  • the slitting edge 11 goes to a frontal, radially outer cutting edge corner 13 into a front chisel edge 15, which extends radially inwards approximately up to the tool axis A.
  • the longitudinal cutting edge 11 is divided into a pre-drilling cutting edge 17 and a paring cutting edge 19 in the axial direction.
  • the pilot cutting edge 17 extends from the tool tip 5 over a cutting edge length L axially in the direction of the tool shank 1 .
  • the pre-drilling cutting edge 17 has a smaller pre-drilling diameter d, while the paring cutting edge 19 has a larger target drilling diameter D, on which the workpiece through-bore 39 is laid out.
  • the peeling blade 19 is formed with a shaping blade 21 on its end face facing the tool tip 5 . By means of the impact cutter 21, an impact stroke hs, which will be described later, is carried out.
  • a chip space 23 is mounted in front of the shaping cutter 21 in the direction of the tool tip 5, via which chippings are transported away during the shaping stroke.
  • the chip space 23 is open in the direction of the chip flute 9 so that the impact chips generated during the impact stroke hs / Fig. 2c) are conveyed from the chip space 23 to the outside of the bore.
  • a drilling/deburring process that can be carried out with the aid of the combination tool is described below with reference to FIGS 25 driven in.
  • a bore edge 27 is produced on the workpiece surface 31 facing away from the tool, on which a burr 28 is formed.
  • the bore edge 27 facing away from the tool has the pre-drilling diameter d in FIG.
  • the impact groove 29 created in the impact stroke hs is indicated in the schematic development of FIG.
  • the position of the cutting edge 21 at the reversal point U, i.e. after the impact stroke hs has been carried out, is indicated in FIG.
  • the peeling blade 19 is guided in the shaping groove 29 without any load, i.e. without chipping.
  • the impact cutter 21 according to FIGS. 1 and 3 has a groove base cutting edge 33 and groove flank cutting edges 35 (only one of which can be seen in FIG. 1). With the help of the groove base cutting edge 33, a radially outer butt groove base 36 (Fig. 3) is produced in the butting step.
  • the butt groove flanks 37 With the aid of the butt groove flanks 35, the butt groove flanks 37 (FIG. 3) raised radially inward from the butt groove base 36 are produced in the butt step.
  • the paring edge pitch ai is reduced in comparison to the butt groove pitch ⁇ 2.
  • the skiving contact between the skiving blade 19 and the material allowance m increases continuously as the tool rotates DR (FIG. 3), which reduces the load on the blades.
  • FIGS. 4a to 4e A drilling/deburring process is shown in FIGS. 4a to 4e, which is carried out with a combination tool shown roughly schematically according to a second exemplary embodiment.
  • the combination tool in FIGS. 4a to 4e has a total of two impact cutting edges 21 lying opposite one another. Each of these transitions axially in the direction of the clamping shank 1 into a peeling edge 19 .
  • two opposing shaping grooves 29 are produced in the inner wall of the pilot bore, in each of which a peeling blade 19 is guided.
  • FIGS. 5a to 5e A further drilling/deburring process is shown in FIGS. 5a to 5e, which is carried out with a combination tool according to a third exemplary embodiment.
  • the peeling blade 19 In contrast to the second exemplary embodiment (FIGS. 4a to 4e), in FIGS. 5a to 5e the peeling blade 19 is guided completely over the hole edge 27 facing away from the tool in the impact stroke hs with a projection x.
  • the peeling step Fig. 4d
  • the combination tool is operated not only with the peeling speed HA, but also with a reverse feed fA.
  • a drilling/deburring process is performed with a step drill. This is shown on its own in FIG.
  • the step drill essentially has the same component geometry as the combination tool indicated in FIGS. Therefore, reference is made to the prescription.
  • the step drill has neither a cutting edge 21 nor a chip space 23 at the transition from the pre-drilling cutting edge 17 to the cutting edge 19 for peeling.
  • Fig. 6c and 8) is out of contact with the material allowance m.
  • a drilling/deburring process that can be carried out with the aid of the step drill is described below with reference to FIGS. 6a to 6e and FIG driven in.
  • a bore edge 27 is produced on the workpiece surface 31 facing away from the tool, on which a burr 28 is formed.
  • the bore edge 27 facing away from the tool has the pre-drill diameter d in FIG D.
  • the cutting edge 19 is still completely inside the bore and offset by an axial offset a (Fig. 8) to the edge of the bore 27 facing away from the tool.
  • a peeling step Fig.
  • the peeling feed fs and the drilling speed n are not synchronized with each other, in contrast to the impact step according to the previous embodiments, in which the impact feed fs and the impact speeds ns are synchronized with one another in such a way that the peeling cutting edge 19 is guided in the impact groove without load, i.e. without chipping.

Landscapes

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

Abstract

L'invention concerne un outil combiné pour percer un trou débouchant (39) dans une pièce (25) et pour ébavurer un bord de trou (27) à l'opposé de l'outil, comprenant au moins une arête de préperçage (17), de diamètre de préperçage (d) inférieur, qui s'étend de la pointe d'outil (5) axialement en direction de la tige d'outil (1) sur une longueur de coupe (L), ainsi qu'au moins une arête d'écroûtage (19) qui présente un diamètre de perçage exigé (D) supérieur. Selon l'invention, l'arête d'écroûtage (19) présente, sur sa face frontale tournée vers la pointe d'outil (5), un tranchant de mortaisage (21).
EP22818614.4A 2021-11-10 2022-11-07 Outil combiné de perçage et d'ébavurage Pending EP4429838A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021129274.3A DE102021129274B4 (de) 2021-11-10 2021-11-10 Kombinationswerkzeug
PCT/EP2022/080907 WO2023083725A1 (fr) 2021-11-10 2022-11-07 Outil combiné de perçage et d'ébavurage

Publications (1)

Publication Number Publication Date
EP4429838A1 true EP4429838A1 (fr) 2024-09-18

Family

ID=84439983

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22818614.4A Pending EP4429838A1 (fr) 2021-11-10 2022-11-07 Outil combiné de perçage et d'ébavurage

Country Status (4)

Country Link
EP (1) EP4429838A1 (fr)
CN (1) CN118215551A (fr)
DE (1) DE102021129274B4 (fr)
WO (1) WO2023083725A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117206909B (zh) * 2023-10-11 2024-06-18 湖南省兴瑞精密制造有限公司 一种精密仪器连接件加工切削钻孔一体化设备
CN118751970B (zh) * 2024-09-05 2024-12-27 哈尔滨理工大学 一种用于抑制毛刺的钻铣一体式刀具及设计方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD8219A1 (en) 1952-08-16 1954-09-09 SHAPE HOLE DRILLING TOOL
US3346894A (en) * 1965-08-23 1967-10-17 Jerome H Lemelson Apparatus for controlling rotary and longitudinal movements of a combined tool carrying spindle
DE2550905A1 (de) 1975-11-13 1977-05-18 Max Oswald Bohrer zum bohren und entgraten
DE8225992U1 (de) * 1982-09-15 1982-12-23 Kadia Diamant Maschinen- und Werkzeugfabrik O. Kopp GmbH & Co, 7440 Nürtingen Bohr- und entgratkopf und darin einspannbares bohr- und entgratwerkzeug
DE4121695A1 (de) 1991-06-29 1993-01-07 Eduard Demmelmaier Kombinations-senker (ks) zur herstellung entgrateter bohrungen bzw. von bohrungen mit ansenkungen in einem arbeitsgang
US9308589B2 (en) 2011-12-27 2016-04-12 Sumitomo Electric Industries, Ltd. Drill
DE202017102498U1 (de) 2017-04-27 2017-05-17 Georg Pirthauer Bohrwerkzeug
CN207026556U (zh) * 2017-06-29 2018-02-23 重庆富强机械配件厂 一种一体式钻头
DE102019109916A1 (de) 2019-04-15 2020-10-15 Gühring KG Bohrwerkzeug zum Bohren und Entgraten

Also Published As

Publication number Publication date
CN118215551A (zh) 2024-06-18
DE102021129274B4 (de) 2025-01-02
DE102021129274A1 (de) 2023-05-11
WO2023083725A1 (fr) 2023-05-19

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