US20050268748A1 - Tubular blank for the production of drilling tools, method for the production of a blank and method for the production of drilling tools - Google Patents
Tubular blank for the production of drilling tools, method for the production of a blank and method for the production of drilling tools Download PDFInfo
- Publication number
- US20050268748A1 US20050268748A1 US10/537,281 US53728105A US2005268748A1 US 20050268748 A1 US20050268748 A1 US 20050268748A1 US 53728105 A US53728105 A US 53728105A US 2005268748 A1 US2005268748 A1 US 2005268748A1
- Authority
- US
- United States
- Prior art keywords
- production
- drilling tool
- clamping
- tubular blank
- forming part
- 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
Links
Images
Classifications
-
- 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
- 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
- B21K5/04—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes twisting-tools, e.g. drills, reamers
-
- 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
- B23B51/06—Drills with lubricating or cooling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/32—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
Definitions
- the invention relates to a tubular blank for the production of drilling tools, the blank having a forming part that can be formed in a non-cutting manner while thereby forming straight or helical chip grooves and coolant channels, and the finished tool being able to be fitted with a shaft for clamping in a machine tool and with a drill tip provided with cutting edges.
- the invention is based on the object of developing a tubular blank of the type stated at the beginning which allows for the different preconditions in terms of deformation and strength in the forming part and the clamping part of the drill body.
- the solution according to the invention is based on the recognition that, for the production of drilling tools, the blank should have a relatively small material wall thickness in the forming part, in order that adequate deformation can take place with few working steps, while thicker-walled material is required in the region of the clamping part, to allow the forces occurring during clamping to be absorbed.
- the clamping on the drill shaft takes place for example by means of clamping screws, which act against a clamping area in the clamping part, or by thermal shrink-fitting of the tool shaft onto the clamping part.
- the clamping area causes the material to be thinned in places if they are produced by a metal-cutting process.
- the clamping screws press against the zone where the material is thinned, it must be ensured that adequate material remains when the clamping area is produced.
- the clamping area is formed by a non-cutting process, for example in a forging operation.
- shrink-fitting it must be taken into account that the clamping chuck is heated up to an elevated temperature, for example to 400° C., and has a relatively high thermal capacity. This leads on contact to heating up of the clamping part and to reduced strength at the moment of clamping.
- the wall thickness must therefore be chosen such that the clamping part is not plastically deformed during this clamping operation.
- the invention proposes a clamping part which is arranged at the shaft-side end of the forming part, is integrally connected to the latter and the tubular wall thickness of which is greater than in the region of the forming part.
- the outside tube diameter is greater in the region of the clamping part than in the region of the forming part.
- the inside tube diameter it is possible in this case for the inside tube diameter to be equal in the region of the clamping part and the forming part, or for the inside tube diameter to be greater or smaller in the region of the clamping part than in the region of the forming part.
- a further advantageous configuration of the invention provides that a preferably planar clamping area is arranged on the outer side of the clamping part, it being possible for the inside tube diameter to be constant or variable over the length of the clamping part and smaller in the region of the clamping area than outside the clamping area.
- the clamping area may in this case run parallel to the tube axis. It is also possible for the clamping area to run obliquely with respect to the tube axis. In the latter case, the drilling tool can be secured better against pulling out of the tool from its clamping restraint.
- both the interior outline and the exterior outline of the blank are circular over the length of the clamping part and over the length of the forming part and have a constant diameter.
- the interior outline it is also possible in principle for the interior outline to be formed in an oval or elliptical manner, at least over the length of the clamping part, the clamping area expediently being arranged in the region of the smaller inside tube diameter. In this way, the wall thickness, and consequently the strength, of the clamping part can be increased in the region of the clamping area.
- a further advantageous configuration of the invention provides that, with a constant outside tube diameter, the inside tube diameter conically diverges at least over part of the length of the forming part toward the free end. This measure allows the cooling channels formed in the forming operation to be widened toward the drill tip.
- a further modification of the cooling channels over the length of the forming part can be achieved by the interior outline of the blank being formed in an oval or elliptical manner at least over part of the length of the forming part.
- a further preferred configuration of the invention provides that a transitional portion which runs conically is provided between the forming part and the clamping part.
- the transitional portion is advantageously conically formed on the inside between the clamping part and the forming part in the same direction as on the outer side.
- a step-shaped transitional portion may also be arranged between the clamping part and the forming part.
- the transitional portion may in this case be formed and dimensioned in such a way that at least one bit seat for receiving a cutting bit can be formed in it there. To improve the flow properties in the cooling channels, it has proven to be particularly advantageous if the flow channel is widened in the transitional portion with respect to the clamping part.
- a piece of tube with a constant inside and outside diameter which is formed, preferably swaged, at least partially over a mandrel from the outside while thereby forming a forming part that has a thinner wall than a clamping part, or is subjected to a metal-cutting operation, preferably drilled or turned on a lathe, on its inner and/or outer surface.
- the clamping area may be formed into the outer surface of the clamping part by either a metal-cutting operation or a non-cutting operation.
- FIG. 1 a shows a side view of a finished drilling tool with a helical chip groove, a thickened clamping shaft and an attached drill tip;
- FIG. 1 b shows a section along the sectional line B-B of FIG. 1 a in an enlarged representation
- FIGS. 2 a to d show four exemplary embodiments of tubular blanks for the production of drilling tools
- FIG. 3 a shows a tubular blank with a clamping area and an oval inner passage
- FIG. 3 b shows a longitudinal section through the blank that is shown in FIG. 3 a;
- FIG. 4 shows a longitudinal section through a blank with a clamping area formed in the clamping part and a conical inner passage in the forming part.
- FIGS. 1 a and b Represented in FIGS. 1 a and b is a drilling tool which has an integral drill body 10 with helical chip grooves 12 and a formed-on clamping part 16 as well as a drill tip 20 integrally attached to the drill body 10 by means of a soldered location 18 .
- the drill body 10 is produced from a tubular blank 22 , which has a central channel 24 passing through it and the wall thickness of which varies over the length ( FIGS. 2 a to d ).
- the chip grooves 12 are formed into the forming part 26 by the swaging method.
- the central channel 24 in the region of the forming part 26 is transformed into cooling channels 27 , which run along the helical ribs 28 between the chip grooves 12 and the outlet points 30 in the region of the drill tip 20 .
- the cooling channels 27 are provided in the region of the forming part 26 with a triangular cross section, the outer delimiting side 40 of which has an outwardly convex curvature that is partially concentric to the part-cylindrical outer surface 42 of the ribs 28 concerned and the inwardly adjoining inner delimiting sides 44 , 46 of which meet at an acute angle at the edge of a triangle 50 pointing towards the drill axis 48 (cf. DE-A-198 56 986).
- the cooling channels formed during the swaging method go over steplessly and seamlessly into the central channel in the region of the clamping part.
- the drilling tool that is shown in FIG. 1 a also has a clamping area 17 , which is formed in it in the region of the clamping part 16 of the blank by either a metal-cutting or a non-cutting operation.
- the clamping area 17 may either run axially parallel, as in the case of FIG. 1 a , or be obliquely aligned as in the case of the exemplary embodiments shown FIGS. 3 a, b and 4 .
- the interior outline of the central channel 24 is formed in an elliptical manner, at least over the length of the clamping part 16 , in such a way that a greater wall thickness is formed on the side of the clamping area 17 .
- the elliptical central channel 24 may also continue into the forming part 26 .
- the cooling channels 27 are elliptically spiralled in the forming operation.
- the central channel 24 is conically widened over the length of the forming part while having a constant outside tube diameter. With this measure, the cooling channels 27 formed in the forming operation are enlarged toward the drill tip.
- the clamping part 16 must absorb clamping forces during the clamping in a tool shaft without thereby undergoing plastic deformation.
- the blank must be formed in a specific manner by plastic deformation in the region of the forming part 26 to introduce the chip grooves 12 .
- the wall thickness of the tubular blank 22 is greater in the clamping part 16 than in the forming part. This can be realized with the inside diameter of the central channel 24 remaining the same by an increased outside diameter in the region of the clamping part 16 ( FIG. 2 a ) or with the outside diameter remaining the same by a reduced inside diameter of the central channel 24 in the region of the clamping part ( FIG. 2 b ).
- both the outer wall and the central channel 24 have different diameters in the region of the clamping part 16 and the forming part 26 .
- an additional transitional portion 32 is provided, which can run conically both on the outer wall and in the central channel 24 ( FIG. 2 d ).
- an inflow chamber 34 with a widened cross section is created in the transitional portion 32 during the forming, as is shown in FIG. 1 a.
- tubular blanks 22 that are shown in FIGS. 2 a to d , it is possible to start with a piece of tube with a constant inside and outside diameter, which is subjected to a metal-cutting operation, preferably drilled or turned on a lathe, on its inner and/or outer surface, or partially formed, preferably swaged, over a mandrel from the outside while thereby forming a forming part 26 that has a thinner wall than the clamping part 16 .
- a metal-cutting operation preferably drilled or turned on a lathe, on its inner and/or outer surface, or partially formed, preferably swaged, over a mandrel from the outside while thereby forming a forming part 26 that has a thinner wall than the clamping part 16 .
- the blank expediently consists of a case hardening steel with a phase transition point of from 480 to 650° C.
- a case hardening steel with a chromium content of less than 2%, preferably a 16 MnCr 5 steel.
- the case hardening steel is hardened, for example by carburizing or nitriding on the surface, and if appropriate on the inner side, after the forming.
- the hardness profile thereby achieved in the wall of the tool shaft leads to a high load-bearing capacity.
- the invention relates to a tubular blank 22 for the production of drilling tools, the blank having a forming part 26 that can be formed in a non-cutting manner while thereby forming chip grooves 12 and coolant channels, and the finished drilling tool being able to be fitted with a shaft for clamping in a machine tool and with a drill tip 20 provided with cutting edges.
- the tubular blank 22 has a clamping part 16 which is arranged at the shaft-side end of the forming part 26 , is integrally connected to the latter and the tubular wall thickness of which is greater than in the region of the forming part 26 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Punching Or Piercing (AREA)
- Forging (AREA)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10255498 | 2002-11-27 | ||
DE10255498.6 | 2002-11-27 | ||
DE10333666.4 | 2003-07-23 | ||
DE10333666A DE10333666A1 (de) | 2002-11-27 | 2003-07-23 | Rohrförmiger Rohling zur Herstellung von Bohrwerkzeugen |
PCT/EP2003/013293 WO2004048015A1 (de) | 2002-11-27 | 2003-11-26 | Rohrförmiger rohling zur herstellung von bohrwerkzeugen, verfahren zur herstellung des rohlings und verfahren zur herstellung von bohrwerkzeugen |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050268748A1 true US20050268748A1 (en) | 2005-12-08 |
Family
ID=32395015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/537,281 Abandoned US20050268748A1 (en) | 2002-11-27 | 2003-11-26 | Tubular blank for the production of drilling tools, method for the production of a blank and method for the production of drilling tools |
Country Status (8)
Country | Link |
---|---|
US (1) | US20050268748A1 (de) |
EP (1) | EP1567293B1 (de) |
JP (1) | JP2006507954A (de) |
AT (1) | ATE336311T1 (de) |
AU (1) | AU2003292124A1 (de) |
DE (1) | DE50304684D1 (de) |
PL (1) | PL375512A1 (de) |
WO (1) | WO2004048015A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050271890A1 (en) * | 2002-07-23 | 2005-12-08 | Michael Koecher | Machine tool with a tool shank and a cutting head |
US20110280678A1 (en) * | 2010-05-03 | 2011-11-17 | Hilti Aktiengesellschaft | Hollow Drill and A Production Process for the Same |
US20170080534A1 (en) * | 2010-04-30 | 2017-03-23 | Kennametal Inc. | Rotary cutting tool having pcd cutting tip |
EP4360801A1 (de) * | 2022-10-24 | 2024-05-01 | Walter Ag | Rohling für ein rotierendes metallschneidwerkzeug |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5013896B2 (ja) * | 2007-02-13 | 2012-08-29 | 京セラ株式会社 | スローアウェイ式ドリルホルダの製造方法、スローアウェイ式ドリルホルダおよびそれを用いたスローアウェイ式ドリル並びにそれを用いた切削方法 |
JP6209902B2 (ja) * | 2013-08-27 | 2017-10-11 | 三菱マテリアル株式会社 | 表面処理ドリル |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2258242A (en) * | 1940-09-27 | 1941-10-07 | Phelps Dodge Copper Prod | Apparatus for drawing tubes of multiple wall thickness |
US2935906A (en) * | 1957-07-01 | 1960-05-10 | Andreasson Rudolf William | Oil tube drill |
US3504575A (en) * | 1966-10-03 | 1970-04-07 | Kobe Steel Ltd | Method of making fluted drill and the like |
US3842632A (en) * | 1973-03-28 | 1974-10-22 | M Nelson | Method of manufacture of lightweight,high-speed dental drill |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4113273A1 (de) * | 1991-04-19 | 1992-10-22 | Mannesmann Ag | Verfahren zum herstellen von rohrfoermigen werkstuecken kurzer laenge mit sich verjuengendem querschnitt |
DE29606164U1 (de) * | 1996-04-03 | 1996-10-02 | Gebr. Felss GmbH + Co KG, 75203 Königsbach-Stein | Verbindungselement |
JP2776796B2 (ja) * | 1996-06-07 | 1998-07-16 | 株式会社三五 | 金属管の増肉加工方法 |
DE19856986A1 (de) * | 1997-12-22 | 1999-07-08 | Komet Stahlhalter Werkzeug | Bohrwerkzeug für Werkzeugmaschinen sowie Verfahren zu dessen Herstellung |
DE10044880A1 (de) * | 2000-09-12 | 2002-03-21 | Volkswagen Ag | Verfahren zur Herstellung von speziell geformten Hohlkörpern aus Metall |
-
2003
- 2003-11-26 PL PL03375512A patent/PL375512A1/xx not_active Application Discontinuation
- 2003-11-26 DE DE50304684T patent/DE50304684D1/de not_active Expired - Lifetime
- 2003-11-26 JP JP2005510237A patent/JP2006507954A/ja active Pending
- 2003-11-26 WO PCT/EP2003/013293 patent/WO2004048015A1/de active IP Right Grant
- 2003-11-26 EP EP03767668A patent/EP1567293B1/de not_active Expired - Lifetime
- 2003-11-26 US US10/537,281 patent/US20050268748A1/en not_active Abandoned
- 2003-11-26 AU AU2003292124A patent/AU2003292124A1/en not_active Abandoned
- 2003-11-26 AT AT03767668T patent/ATE336311T1/de not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2258242A (en) * | 1940-09-27 | 1941-10-07 | Phelps Dodge Copper Prod | Apparatus for drawing tubes of multiple wall thickness |
US2935906A (en) * | 1957-07-01 | 1960-05-10 | Andreasson Rudolf William | Oil tube drill |
US3504575A (en) * | 1966-10-03 | 1970-04-07 | Kobe Steel Ltd | Method of making fluted drill and the like |
US3842632A (en) * | 1973-03-28 | 1974-10-22 | M Nelson | Method of manufacture of lightweight,high-speed dental drill |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050271890A1 (en) * | 2002-07-23 | 2005-12-08 | Michael Koecher | Machine tool with a tool shank and a cutting head |
US20170080534A1 (en) * | 2010-04-30 | 2017-03-23 | Kennametal Inc. | Rotary cutting tool having pcd cutting tip |
US10328536B2 (en) * | 2010-04-30 | 2019-06-25 | Kennametal Inc. | Rotary cutting tool having PCD cutting tip |
US20110280678A1 (en) * | 2010-05-03 | 2011-11-17 | Hilti Aktiengesellschaft | Hollow Drill and A Production Process for the Same |
US8806982B2 (en) * | 2010-05-03 | 2014-08-19 | Hilti Aktiengesellschaft | Hollow drill and a production process for the same |
EP4360801A1 (de) * | 2022-10-24 | 2024-05-01 | Walter Ag | Rohling für ein rotierendes metallschneidwerkzeug |
WO2024088707A1 (en) * | 2022-10-24 | 2024-05-02 | Walter Ag | A blank for a rotary metal cutting tool |
Also Published As
Publication number | Publication date |
---|---|
WO2004048015A1 (de) | 2004-06-10 |
EP1567293A1 (de) | 2005-08-31 |
DE50304684D1 (de) | 2006-09-28 |
AU2003292124A1 (en) | 2004-06-18 |
PL375512A1 (en) | 2005-11-28 |
EP1567293B1 (de) | 2006-08-16 |
ATE336311T1 (de) | 2006-09-15 |
JP2006507954A (ja) | 2006-03-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KOMET GROUP HOLDING GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOECHER, MICHAEL;REEL/FRAME:016481/0362 Effective date: 20050525 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |