EP0988125A1 - Procede de production de fraises - Google Patents

Procede de production de fraises

Info

Publication number
EP0988125A1
EP0988125A1 EP98929975A EP98929975A EP0988125A1 EP 0988125 A1 EP0988125 A1 EP 0988125A1 EP 98929975 A EP98929975 A EP 98929975A EP 98929975 A EP98929975 A EP 98929975A EP 0988125 A1 EP0988125 A1 EP 0988125A1
Authority
EP
European Patent Office
Prior art keywords
cbn
shank
endmill
cemented carbide
tenon
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Withdrawn
Application number
EP98929975A
Other languages
German (de)
English (en)
Inventor
Peter Littecke
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.)
Sandvik AB
Original Assignee
Sandvik AB
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 Sandvik AB filed Critical Sandvik AB
Publication of EP0988125A1 publication Critical patent/EP0988125A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/1081—Shank-type cutters, i.e. with an integral shaft with permanently fixed cutting inserts 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • 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
    • B23P15/34—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools milling cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/12—Boron nitride
    • B23C2226/125—Boron nitride cubic [CBN]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/31—Diamond
    • B23C2226/315—Diamond polycrystalline [PCD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/08—Brazed connections

Definitions

  • This invention relates to an endmill with cBN (cubic boron nitride) or PCD (polycrystalline diamond) in the cutting edges and a method of making the same.
  • the purpose of the method is to decrease the cost compared to existing methods.
  • An endmill is used for machining of grooves, pockets and slots and consists of a cylindrical holder with cutting means at the end. It can be made of high speed steel, or solid cemented carbide, but it can also consist of a steel holder with cemented carbide inserts as cutting means .
  • metal cutting inserts having cutting edges formed of a superhard material, such as PCD are usually used for the machining of non-ferrous alloys such as brass, magnesium and aluminium, and the like, whereas inserts with cutting edges formed of a superhard abrasive, such as cBN are usually used for the machining of cast iron and hardened steel and the like.
  • PCD or cBN endmills there are several types of PCD or cBN endmills on the market today. Essentially there are two different methods to manufacture them. One method includes sintering cBN or diamond powder under elevated pressure and temperature into a solid cylindrical body which is then brazed onto a shank and finished into an endmill . The other method includes bonding a layer of cBN or diamond under elevated pressure and temperature to a substrate, usually a cemented carbide disc, from which smaller pieces, "chips", are cut out. These chips are then brazed onto a cemented carbide rod and ground to the finished shape. Tools produced that way are normally quite expensive due to the many steps the product must undergo before it is finished.
  • the object of the present invention is therefore to provide a method, where an endmill with several cutting edges can be achieved but at a substantially lower cost.
  • Fig 1 shows the principle of the method where 1 is the element that will form the cutting part,
  • FIG. 5 is a top view of the element 1 after shaping to expose the cutting edges.
  • the starting point is a cemented carbide disc preferably with a binder phase content of >10 wt-% provided with superhard bodies according to the teachings of US 5,676,496.
  • the cemented carbide disc is made from a cemented carbide rod with a circular, square, triangular or other suitable cross section preferably with a center hole.
  • This rod one or more grooves are ground throughout its whole length and parallel to its axis.
  • the groove can be straight but it can also be helical.
  • the number of grooves and their location depend on the type of disc that is to be produced.
  • the shape of the grooves can be made in different ways. It is important, however, that they have a rounded or plane shape. Their size shall be such that the cutting work essentially is performed by the superhard material . After HP/HT sintering the rod is cut into discs of desired thickness .
  • cemented carbide discs at least one groove is ground and filled with a powder mixture containing cBN and/or diamond after which the discs are treated at a temperature and pressure where cBN and/or diamond is stable. During this treatment the discs are separated from each other in such a way that they do not sinter together.
  • the shank 2 is preferably made in cemented carbide preferably with a binder phase content of >10 wt-%. The diameter of the shank is somewhat smaller than the diameter of the disc with superhard materials . The other end of the shank is provided with clamping means .
  • the PCD/cBN disc is then brazed together with the shank .
  • the end of the shank where the PCD/cBN disc is brazed is ground down to form a tenon, 4.
  • the shape of the tenon is generally cylindrical but it may alternatively be tapered, square, triangular, elliptical or other non-round shape.
  • the diameter (or equivalent) of the tenon is about 15 - 40 % of the diameter of the shank and is designed to fit within the center hole of the disc 1 although the tenon does not have to extend through the entire length of that center hole.
  • the PCD/cBN disc is then brazed together with the shank using the tenon as guide and braze joint, 3. It is according to the invention essential that brazing is made only at the tenon. This will minimise the risk of braze joint failure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

L'invention concerne une fraise dotée d'arêtes de coupe en nitrure de bore cubique ou en diamant polycristallin, comprenant une partie queue et un élément contenant le nitrure de bore cubique ou le diamant polycristallin. Cet élément, fixé à la queue par brasage, a la forme d'un disque dans lequel le matériau extra-dur est présent dans une rainure pratiquée à la surface de l'enveloppe et s'étend de la face d'une extrémité à la face de l'autre extrémité. Une fois le disque fixé à la queue par brasage, le corps ainsi obtenu est usiné pour donner une fraise dotée d'arêtes de coupe en matériau extra-dur. Dans un mode de réalisation préféré, la queue est dotée d'un tenon sur lequel l'élément contenant le matériau extra-dur est fixé par brasage. Cela réduit le risque de défaillance aux points de brasage et permet la fabrication à faible coût d'une fraise pourvue de plusieurs arêtes de coupe.
EP98929975A 1997-06-13 1998-06-10 Procede de production de fraises Withdrawn EP0988125A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9702297A SE512752C2 (sv) 1997-06-13 1997-06-13 Sätt att tillverka pinnfräsar
SE9702297 1997-06-13
PCT/SE1998/001113 WO1998056528A1 (fr) 1997-06-13 1998-06-10 Procede de production de fraises

Publications (1)

Publication Number Publication Date
EP0988125A1 true EP0988125A1 (fr) 2000-03-29

Family

ID=20407402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98929975A Withdrawn EP0988125A1 (fr) 1997-06-13 1998-06-10 Procede de production de fraises

Country Status (8)

Country Link
EP (1) EP0988125A1 (fr)
JP (1) JP2002504027A (fr)
KR (1) KR20010013691A (fr)
CN (1) CN1260742A (fr)
CA (1) CA2290023A1 (fr)
SE (1) SE512752C2 (fr)
WO (1) WO1998056528A1 (fr)
ZA (1) ZA985147B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100423006B1 (ko) * 2001-07-18 2004-03-12 프리시젼다이아몬드 주식회사 볼 커터용 날의 제조방법과 이에 의해 제조한 날
DE10159431B4 (de) * 2001-12-04 2005-10-20 Mapal Fab Praezision Werkzeug zur Feinstbearbeitung von Oberflächen
FR2892326B1 (fr) * 2005-10-24 2009-05-08 Sofdiam Soc Par Actions Simpli Fraise en deux parties
SI2519378T1 (sl) * 2009-12-31 2014-02-28 Diamond Innovations, Inc. Surovec za izdelavo obdelovalnega orodja in postopek uporabe surovca za izdelavo obdelovalnega orodja
EP3157698B1 (fr) * 2014-06-23 2023-03-08 Sumitomo Electric Hardmetal Corp. Outil de coupe et procédé de fabrication d'un outil de coupe
CN105458641A (zh) * 2016-01-06 2016-04-06 倍兹（上海）精密刀具有限公司 应用于小直径孔加工的整体pcd刀具的制造方法
CN107952986A (zh) * 2016-10-17 2018-04-24 上海精韧激光科技有限公司 用于制造切削工具的坯料及其制造方法
CN108262495A (zh) * 2016-12-31 2018-07-10 上海名古屋精密工具股份有限公司 用于超硬切削工具制造的坯料及其制造方法
KR102249490B1 (ko) * 2019-10-18 2021-05-12 한국오에스지 주식회사 볼 엔드밀용 인서트의 구조

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5031484A (en) * 1990-05-24 1991-07-16 Smith International, Inc. Diamond fluted end mill
ZA963789B (en) * 1995-05-22 1997-01-27 Sandvik Ab Metal cutting inserts having superhard abrasive boedies and methods of making same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9856528A1 *

Also Published As

Publication number Publication date
WO1998056528A1 (fr) 1998-12-17
SE9702297D0 (sv) 1997-06-13
JP2002504027A (ja) 2002-02-05
SE512752C2 (sv) 2000-05-08
KR20010013691A (ko) 2001-02-26
CA2290023A1 (fr) 1998-12-17
ZA985147B (en) 1999-01-20
SE9702297L (sv) 1998-12-14
CN1260742A (zh) 2000-07-19

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