CA2290023A1 - Method of making endmills - Google Patents
Method of making endmills Download PDFInfo
- Publication number
- CA2290023A1 CA2290023A1 CA002290023A CA2290023A CA2290023A1 CA 2290023 A1 CA2290023 A1 CA 2290023A1 CA 002290023 A CA002290023 A CA 002290023A CA 2290023 A CA2290023 A CA 2290023A CA 2290023 A1 CA2290023 A1 CA 2290023A1
- Authority
- CA
- Canada
- 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.)
- Abandoned
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Milling Processes (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Drilling Tools (AREA)
Abstract
The present invention relates to an endmill provided with cutting edges of cBN or PCD and consisting of a shank part and a part containing the cBN or PCD brazed to the shank. The latter part is in the form of a disc in which the superhard material is present in a groove in the envelope surface and extends from one end surface to the other. After brazing the disc to the shank, the body obtained is ground to an endmill with cutting edges formed of superhard material. In a preferred embodiment, the shank is provided with a tenon against which the part containing the superhard material is brazed. This minimises the risk of braze joint failure and provides an endmill with several cutting edges which can be achieved at a low cost.
Description
Method of making endmills 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. For certain applications 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.
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.
CONFIRMATION
coPY
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. For certain applications 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.
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.
CONFIRMATION
coPY
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, 2 is the shank 3 is the braze joint and 4 is a tenon 5 is a top view of the element 1 after shaping to expose the cutting edges.
According to the method of the present invention 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. Into 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.
Alternatively, in one or more 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.
I I T
- WO 98/56528 .~ PCT/SE98/01113 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.
In a preferred embodiment 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.
After brazing the tool obtained is ground in such a way that cutting edges are formed from the superhard bodies as shown in the top view 5 of Fig 1.
Fig 1 shows the principle of the method where 1 is the element that will form the cutting part, 2 is the shank 3 is the braze joint and 4 is a tenon 5 is a top view of the element 1 after shaping to expose the cutting edges.
According to the method of the present invention 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. Into 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.
Alternatively, in one or more 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.
I I T
- WO 98/56528 .~ PCT/SE98/01113 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.
In a preferred embodiment 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.
After brazing the tool obtained is ground in such a way that cutting edges are formed from the superhard bodies as shown in the top view 5 of Fig 1.
Claims (10)
1. Endmill provided with cutting edges of cBN or PCD
and consisting of a shank part and a part containing the cBN or PCD brazed to the shank characterised in that said shank is provided with a tenon against which the part containing the superhard material is brazed.
and consisting of a shank part and a part containing the cBN or PCD brazed to the shank characterised in that said shank is provided with a tenon against which the part containing the superhard material is brazed.
2. Endmill according to the preceding claim characterised in that said tenon is round.
3. Endmill according to claim 1 characterised in that said tenon is tapered.
4. Endmill according to claim 1 characterised in that said tenon is of non-round shape.
5. Endmill according to claim 1 characterised in that said tenon extends at least part way into the part containing the superhard material.
6. Method of making an endmill provided with at least one cutting edge of cBN or PCD and consisting of a shank part and a part containing the cBN or PCD
characterised in comprising the steps providing a cemented carbide disc preferably with a cylindrical cross section provided with at least one body of a superhard material in a groove in the envelope surface and extending from one end surface to the other brazing said cemented carbide disc to a shank grinding the obtained body to form an endmill with cutting edges formed from the superhard material.
characterised in comprising the steps providing a cemented carbide disc preferably with a cylindrical cross section provided with at least one body of a superhard material in a groove in the envelope surface and extending from one end surface to the other brazing said cemented carbide disc to a shank grinding the obtained body to form an endmill with cutting edges formed from the superhard material.
7. Method according to claim 6 characterised in that said cemented carbide disc is made using the following steps providing a cemented carbide bar grinding at least one groove in said bar filling said groove with a powder mixture containing cBN and/or diamond heat treating said cemented carbide bar at a temperature and pressure where cBN and/or diamond is stable and cutting said bar into discs.
8. Method according to claim 6 characterised in said cemented carbide disc is made using the following steps providing one or more cemented carbide discs grinding at least one groove in said discs filling said groove in said discs with a powder mixture containing cBN and/or diamond heat treating said cemented carbide discs at a temperature and pressure where cBN and/or diamond is stable whereby the discs are separated from each other in such a way that they do not sinter together.
9. Method according to any of claims 6 - 8 characterised in the step of brazing said shank part to the part containing the superhard material with the aid of a tenon formed in the end of said shank part and a hole extending at least partway through said part containing the superhard material.
10. The product according to any of claims 6 - 8.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9702297-4 | 1997-06-13 | ||
| SE9702297A SE512752C2 (en) | 1997-06-13 | 1997-06-13 | Ways to make stick cutters |
| PCT/SE1998/001113 WO1998056528A1 (en) | 1997-06-13 | 1998-06-10 | Method of making endmills |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2290023A1 true CA2290023A1 (en) | 1998-12-17 |
Family
ID=20407402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002290023A Abandoned CA2290023A1 (en) | 1997-06-13 | 1998-06-10 | Method of making endmills |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0988125A1 (en) |
| JP (1) | JP2002504027A (en) |
| KR (1) | KR20010013691A (en) |
| CN (1) | CN1260742A (en) |
| CA (1) | CA2290023A1 (en) |
| SE (1) | SE512752C2 (en) |
| WO (1) | WO1998056528A1 (en) |
| ZA (1) | ZA985147B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10040126B2 (en) | 2014-06-23 | 2018-08-07 | Sumitomo Electric Hardmetal Corp. | Cutting tool and method of manufacturing a cutting tool |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100423006B1 (en) * | 2001-07-18 | 2004-03-12 | 프리시젼다이아몬드 주식회사 | A blade manufactureing method of a ball cutter and the blade thereof |
| DE10159431B4 (en) * | 2001-12-04 | 2005-10-20 | Mapal Fab Praezision | Tool for finishing surfaces |
| FR2892326B1 (en) * | 2005-10-24 | 2009-05-08 | Sofdiam Soc Par Actions Simpli | STRAWBERRY IN TWO PARTS |
| PL2519378T3 (en) * | 2009-12-31 | 2014-04-30 | Diamond Innovations Inc | Blank for the manufacture of a machining tool and method of use of a blank for the manufacture of a machining tool |
| CN105458641A (en) * | 2016-01-06 | 2016-04-06 | 倍兹（上海）精密刀具有限公司 | Manufacturing method for integral PCD cutters applied to small-diameter hole manufacturing |
| CN107952986A (en) * | 2016-10-17 | 2018-04-24 | 上海精韧激光科技有限公司 | For manufacturing the blank and its manufacture method of cutting element |
| CN108262495A (en) * | 2016-12-31 | 2018-07-10 | 上海名古屋精密工具股份有限公司 | For the blank and its manufacturing method of ultra-hard cutting tool manufacture |
| KR102249490B1 (en) * | 2019-10-18 | 2021-05-12 | 한국오에스지 주식회사 | Structure of insert for ball end mill |
Family Cites Families (2)
| 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 |
-
1997
- 1997-06-13 SE SE9702297A patent/SE512752C2/en not_active IP Right Cessation
-
1998
- 1998-06-10 JP JP50229099A patent/JP2002504027A/en active Pending
- 1998-06-10 CA CA002290023A patent/CA2290023A1/en not_active Abandoned
- 1998-06-10 WO PCT/SE1998/001113 patent/WO1998056528A1/en not_active Application Discontinuation
- 1998-06-10 KR KR19997011706A patent/KR20010013691A/en not_active Application Discontinuation
- 1998-06-10 EP EP98929975A patent/EP0988125A1/en not_active Withdrawn
- 1998-06-10 CN CN98806156A patent/CN1260742A/en active Pending
- 1998-06-12 ZA ZA985147A patent/ZA985147B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10040126B2 (en) | 2014-06-23 | 2018-08-07 | Sumitomo Electric Hardmetal Corp. | Cutting tool and method of manufacturing a cutting tool |
Also Published As
| Publication number | Publication date |
|---|---|
| SE512752C2 (en) | 2000-05-08 |
| CN1260742A (en) | 2000-07-19 |
| JP2002504027A (en) | 2002-02-05 |
| WO1998056528A1 (en) | 1998-12-17 |
| KR20010013691A (en) | 2001-02-26 |
| EP0988125A1 (en) | 2000-03-29 |
| SE9702297L (en) | 1998-12-14 |
| ZA985147B (en) | 1999-01-20 |
| SE9702297D0 (en) | 1997-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7189032B2 (en) | Tool insert | |
| US5676496A (en) | Metal cutting inserts having superhard abrasive bodies and methods of making same | |
| US6447560B2 (en) | Method for forming a superabrasive polycrystalline cutting tool with an integral chipbreaker feature | |
| KR100383715B1 (en) | Metal cutting inserts having superhard abrasive bodies and methods of making same | |
| US20050271483A1 (en) | Indexable cutting inserts and methods for producing the same | |
| KR101233617B1 (en) | Indexable cutting inserts and methods for producing the same | |
| EP0480895A2 (en) | Improved diamond tools for rock drilling, metal cutting and wear part applications | |
| JPH0348315B2 (en) | ||
| EP1624988A1 (en) | Cutting tool inserts and methods to manufacture | |
| US5486072A (en) | Cutting tools of composite construction | |
| CA2290023A1 (en) | Method of making endmills | |
| JPH0373210A (en) | High hardness cutting tool and manufacture and use thereof | |
| US8795460B2 (en) | Indexable cutter insert, construction for same and method for making same | |
| JPH08336716A (en) | Rotary cutting tool | |
| US4295885A (en) | Material and method for securing boron filaments to each other and to a substrate and cutting tools therefrom | |
| US4116689A (en) | Material and method for securing boron filaments to each other and to a substrate and cutting tools therefrom | |
| US20080131304A1 (en) | Endmills | |
| JP2000190108A (en) | Polycrystalline hard sintered body cutting tool | |
| EP0220964B1 (en) | Cubic boron nitride abrasive bodies | |
| JP2720951B2 (en) | Cutting tool with high hardness composite sintered body as cutting edge | |
| JP2004268202A (en) | Small diameter end mill | |
| JP2002003907A (en) | Manufacturing method of composite twisted sintered compact | |
| JPS6112963B2 (en) | ||
| JPH0426961B2 (en) | ||
| JP2000052109A (en) | Combined tip for rotary tool and its manufacture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |