EP3956093A1 - Bohrwerkzeug zum bohren und entgraten - Google Patents
Bohrwerkzeug zum bohren und entgratenInfo
- Publication number
- EP3956093A1 EP3956093A1 EP20718141.3A EP20718141A EP3956093A1 EP 3956093 A1 EP3956093 A1 EP 3956093A1 EP 20718141 A EP20718141 A EP 20718141A EP 3956093 A1 EP3956093 A1 EP 3956093A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drilling tool
- bevel
- milling
- drilling
- web
- 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.)
- Withdrawn
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 60
- 238000003801 milling Methods 0.000 claims abstract description 54
- 238000003754 machining Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
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
- 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
- B23B2251/00—Details of tools for drilling machines
- B23B2251/44—Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
- B23B2251/443—Double margin drills
Definitions
- the invention relates to a drilling tool for drilling and deburring a borehole according to the independent claim.
- the invention lies in the technical field of cutting tools, such as drills or milling cutters. During milling, this feed movement takes place perpendicular or at an angle to the axis of rotation of the tool, while during drilling the feed direction takes place in the direction of the axis of rotation.
- twist drills A common example of drills are twist drills. Conventional twist drills are described in DIN ISO 5419. Such twist drills have a drill tip (drill end) which provides the main cutting edge for cutting a workpiece. Starting from the drill tip, the tool section runs in flutes and webs that spiral around the drill axis to the drill shank, which is used to clamp and fold the drill.
- burrs arise due to the displacement of the material during cutting or machining.
- Burrs include sharp edges, fraying, fraying or splinters that are located at the drill hole. Such burrs can impair the further processability of the workpiece and make additional work necessary to remove them.
- a large number of techniques are known for deburring, including grinding, brushing, filing, milling or countersinking.
- a disadvantage of the known techniques for deburring is that a separate work step is necessary, which is time-consuming and labor-intensive.
- a milling tool that rotates around its own axis at high speed can follow the contour of the borehole and remove the material forming the burrs.
- Such milling tools have as a common feature a shank as a clamping part which is inserted into a tool holder.
- Such milling tools are used, for example, as slot milling cutters or die milling cutters with a flat or round face.
- Such milling tools are also characterized in that they have a plurality of helically extending circumferential cutting edges in the region of their cutting section on the milling webs separated from one another by flutes, each of which is designed with a roughing profile.
- Such roughing profiles are standardized in the versions in DIN 1836, for example.
- the object of the present invention is to overcome the disadvantages in the prior art and, in particular, to provide a drilling tool which is suitable for drilling and deburring a borehole machined in a workpiece.
- the invention comprises a drilling tool, in particular a drilling milling cutter, for drilling and deburring a borehole.
- the drilling tool comprises a tool section with main cutting edges at the end for machining the borehole and with spiral flutes, each separated by a web.
- a guide chamfer is arranged along a boundary line between the web and the flute.
- On the jetty is also at least one milling bevel arranged.
- the milling bevel allows the borehole to be deburred during drilling by the front side of the milling bevel moving along the borehole due to the rotation of the drilling tool and cutting off the burrs.
- the advantage is that no additional tool is required for deburring and the back of the borehole that is difficult to reach can be easily machined.
- Any continuous or section-wise protrusion running along the tool section is referred to here as a chamfer, the protrusion being an enlargement of the outer diameter in the cross-sectional contour of the web.
- a preferred example provides that the milling bevel is arranged on the web in the direction of rotation CO of the drilling tool behind the guide bevel.
- the guide chamfer lies in front of the milling chamfer, which can be arranged along the entire width of the web.
- the milling bevel is preferably arranged in a spiral shape at the center of the web parallel to the guide bevel.
- the milling chamfer can run continuously along the tool section in accordance with the guide chamfer or run parallel in sections and in particular have a cutting profile.
- the milling bevel and the guide bevel are offset from one another by an angle a in the range of 50 ° to 80 ° (in particular 60 ° to 70 °) with respect to the axis of rotation A-A of the drilling tool.
- the milling chamfer is thus in the rear area of the web, while the guide chamfer forms the start of the web.
- Drill lying forward comprises an outwardly extending cutting portion.
- the milling bevel in the contour of the top view has several sections separated from one another by edges (or corners) in the axial direction of the drill, the cutting section extending outwards in the direction of rotation fulfilling the milling functionality or cutting functionality.
- the outwardly extending cutting section is advantageously arranged lying radially outward.
- the radial arrangement allows a sharp edge to be formed on the outside.
- the outwardly extending cutting section is at an angle ⁇ in relation to the radial direction
- the angle ⁇ is in the range from 1 ° to 4 °.
- the cutting section has a length in the range from 0.3 mm to 0.9 mm.
- the milling bevel particularly preferably has a circumferential section.
- the circumferential section and the cutting section are arranged with respect to one another in such a way that they enclose an angle Q of less than 45 °. In this way, a sharply cutting edge can be achieved at the boundary between the cutting section and the peripheral section.
- the circumferential section advantageously has a length in the range from 0.5 mm to 2 mm. A favorable and permanent dimensioning can take place here according to the drill circumference and material.
- the circumferential section preferably comprises a concave outer contour, at least in sections.
- the milling bevel is designed in a spiral shape such that the spiral line is arranged with a twist angle in the range from 30 ° to 50 °, in particular in the range from 38 ° to 42 °.
- Another example provides that a milling bevel is arranged on each web.
- an outer diameter of the drilling tool at the guide bevel d2 tapers in the axial direction starting from the drill tip.
- outside diameter of the drilling tool at the milling bevel d1 tapers in the axial direction starting from the drill tip.
- FIG. 1 side view of a drilling tool according to the invention
- 2a shows a plan view of the drilling tool according to the invention from FIG. 1;
- FIG. 2b detailed view of the outer contour of the drilling tool from the
- FIG. 1 shows a side view of a drilling tool 1 which, according to the invention, can be used for simultaneous drilling and milling deburring of a borehole.
- the drilling tool 1 shown has in the upper part a tool section 11 which runs from the drill tip with the main cutting edges 12 at the end to the shank for clamping the drilling tool.
- the main cutting edges 12 are used to machine a borehole with a rotating movement of the drilling tool 1 about an axial feed direction.
- the main cutting edges 12 are adjoined by spiral flutes 2, each separated by a web 3, for the removal of the material.
- a guide bevel 4 is formed on the spiral-shaped boundary line between web 3 and flute 2.
- the milling chamfer 5 shown is arranged in a spiral shape at the center of the web 3 parallel to the guide chamfer 4.
- the milling bevel 5 is designed in a spiral shape such that the spiral line is arranged with a twist angle d of 40 °
- the drilling tool 1 is shown in Fig. 2a in a plan view of the drill tip.
- the contour shows that the milling bevel 5 on the outer circumference of the Web 3 is arranged behind the guide bevel 4 in the direction of rotation CJÜ of the drilling tool 1, which is illustrated by an arrow.
- the milling bevel 5 and the guide bevel 4 are offset from one another by an angle ⁇ of 65 ° with respect to the axis of rotation A-A of the drilling tool 1.
- FIG. 2 b is a detailed view with an enlarged section of the outer contour of the drilling tool in the area of the milling bevel 5.
- the milling bevel 5 has an outwardly extending cutting section 51. With respect to the direction of rotation CJÜ (see FIG. 2) of the drill, the outwardly extending cutting section 51 is arranged at the front.
- the cutting section 51 is not arranged radially, but the outwardly extending cutting section 51 extends with respect to the radial direction at an angle ⁇ in the direction of rotation CJÜ of the drill.
- the outwardly extending cutting portion 51 has a length in the range of 0.3 mm to 0.9 mm.
- the milling bevel 5 also has a circumferential section 52.
- the circumferential section 52 and the outwardly extending cutting section 51 have an angle Q of less than 45 °.
- the circumferential section 52 has a length in the range from 0.5 mm to 2 mm. With respect to the rear part in the direction of rotation, the circumferential section 52 has, at least in sections, a concavely curved outer contour.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Milling Processes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019109916.1A DE102019109916A1 (de) | 2019-04-15 | 2019-04-15 | Bohrwerkzeug zum Bohren und Entgraten |
PCT/DE2020/100251 WO2020211899A1 (de) | 2019-04-15 | 2020-03-27 | Bohrwerkzeug zum bohren und entgraten |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3956093A1 true EP3956093A1 (de) | 2022-02-23 |
Family
ID=70277115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20718141.3A Withdrawn EP3956093A1 (de) | 2019-04-15 | 2020-03-27 | Bohrwerkzeug zum bohren und entgraten |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3956093A1 (de) |
DE (1) | DE102019109916A1 (de) |
WO (1) | WO2020211899A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021129274A1 (de) | 2021-11-10 | 2023-05-11 | Audi Aktiengesellschaft | Kombinationswerkzeug |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5923925B2 (ja) * | 1975-12-29 | 1984-06-06 | カブシキガイシヤ ササクラキカイセイサクシヨ | ドリルリ−マ−フクゴウセンコウグ |
DE3325149A1 (de) * | 1983-07-12 | 1985-01-24 | Gühring, Gottlieb, 7470 Albstadt | Zweischneidiges wendelbohrwerkzeug als kombiniertes zentrier-, bohr- und aufbohrwerkzeug |
KR100990171B1 (ko) * | 2008-01-28 | 2010-10-29 | 박광훈 | 난삭재의 고속가공용 트위스트 드릴 리머 |
DE202008006036U1 (de) * | 2008-05-02 | 2008-07-10 | Günther Wirth Hartmetallwerkzeuge GmbH & Co. KG | Zylindrisches Bohrwerkzeug |
DE102008049508B4 (de) * | 2008-09-19 | 2010-12-16 | Mk-Tools-Service Gmbh | Bohrer |
JP2017202541A (ja) * | 2016-05-11 | 2017-11-16 | 有限会社栄進機工 | ドリルリーマ |
-
2019
- 2019-04-15 DE DE102019109916.1A patent/DE102019109916A1/de not_active Withdrawn
-
2020
- 2020-03-27 EP EP20718141.3A patent/EP3956093A1/de not_active Withdrawn
- 2020-03-27 WO PCT/DE2020/100251 patent/WO2020211899A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
DE102019109916A1 (de) | 2020-10-15 |
WO2020211899A1 (de) | 2020-10-22 |
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