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 PDF

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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
Application number
US10/537,281
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English (en)
Inventor
Michael Koecher
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.)
Komet Group GmbH
Original Assignee
Komet Group Holding GmbH
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
Priority claimed from DE10333666A external-priority patent/DE10333666A1/de
Application filed by Komet Group Holding GmbH filed Critical Komet Group Holding GmbH
Assigned to KOMET GROUP HOLDING GMBH reassignment KOMET GROUP HOLDING GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOECHER, MICHAEL
Publication of US20050268748A1 publication Critical patent/US20050268748A1/en
Abandoned legal-status Critical Current

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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)
US10/537,281 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 Abandoned US20050268748A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10255498 2002-11-27
DE10255498.6 2002-11-27
DE10333666A DE10333666A1 (de) 2002-11-27 2003-07-23 Rohrförmiger Rohling zur Herstellung von Bohrwerkzeugen
DE10333666.4 2003-07-23
PCT/EP2003/013293 WO2004048015A1 (fr) 2002-11-27 2003-11-26 Ebauche tubulaire servant a produire des outils de perçage, procede de production d'une ebauche tubulaire et procede de production d'outils de perçage

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 (fr)
EP (1) EP1567293B1 (fr)
JP (1) JP2006507954A (fr)
AT (1) ATE336311T1 (fr)
AU (1) AU2003292124A1 (fr)
DE (1) DE50304684D1 (fr)
PL (1) PL375512A1 (fr)
WO (1) WO2004048015A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
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 (fr) * 2022-10-24 2024-05-01 Walter Ag Ébauche pour outil de coupe rotatif de métal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
US6540452B1 (en) * 1997-12-22 2003-04-01 Komet Praezisionswerkzeuge Robert Breuning Gmbh Drilling tool for machine tools and method for the production thereof
DE10044880A1 (de) * 2000-09-12 2002-03-21 Volkswagen Ag Verfahren zur Herstellung von speziell geformten Hohlkörpern aus Metall

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 (fr) * 2022-10-24 2024-05-01 Walter Ag Ébauche pour outil de coupe rotatif de métal
WO2024088707A1 (fr) * 2022-10-24 2024-05-02 Walter Ag Flan pour outil de coupe métallique rotatif

Also Published As

Publication number Publication date
EP1567293B1 (fr) 2006-08-16
DE50304684D1 (de) 2006-09-28
ATE336311T1 (de) 2006-09-15
EP1567293A1 (fr) 2005-08-31
JP2006507954A (ja) 2006-03-09
WO2004048015A1 (fr) 2004-06-10
AU2003292124A1 (en) 2004-06-18
PL375512A1 (en) 2005-11-28

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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