GB2085769A - High hardness cutting tool - Google Patents
High hardness cutting tool Download PDFInfo
- Publication number
- GB2085769A GB2085769A GB8129961A GB8129961A GB2085769A GB 2085769 A GB2085769 A GB 2085769A GB 8129961 A GB8129961 A GB 8129961A GB 8129961 A GB8129961 A GB 8129961A GB 2085769 A GB2085769 A GB 2085769A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sintered body
- high hardness
- shaped
- plate
- layer
- 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.)
- Granted
Links
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
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23B2222/16—Cermet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/12—Boron nitride
- B23B2226/125—Boron nitride cubic [CBN]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/31—Diamond
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2240/00—Details of connections of tools or workpieces
- B23B2240/08—Brazed connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Drilling Tools (AREA)
- Powder Metallurgy (AREA)
- Laminated Bodies (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The cutting tool comprises a rotary tool (5) and a 3-layer-laminated plate-shaped sintered body bonded to the point of the rotary tool (5), said 3-layer-laminated plate-shaped sintered body consisting of a high hardness plate-shaped sintered body (1) containing high density boron nitride and/or diamond and two plate-shaped cermet sintered body layers, (2,2'), said high hardness sintered body (1) being interposed between the cermet sintered body layers (2,2') and adhered thereto. The cermet layers are brazed to the tool by silver solder layers (6, 7). The tool is a drill, reamer or end mill. <IMAGE>
Description
SPECIFICATION
High hardness cutting tool
The present invention relates to a rotary cutting tool using a high hardness sintered body containing high
density boron nitride and/or diamond.
A sintered body containing high density boron nitride and/or diamond (hereinafter referred to as a
sintered body containing a high density boron
nitride and the like) to be used in the point of a rotary
tool has hitherto been made into a 2-layer-laminated
plate-shaped sintered body, wherein the sintered
body containing high density boron nitride and the
like is superposed on and adhered to a cermet
sintered body, so as to be easily worked into a tool.
That is since, in general a sintered body containing
high density boron nitride and the like cannot be
directly bonded to a metal shank or the like through
silver soldering or other similar methods, there has
been carried out a method wherein a cermet sintered
body is bonded to the sintered body containing high
density boron nitride and the like through sintering
at the same time with the sintering for the produc
tion of the sintered body containing high density
boron nitride and the like. In the accompanying
drawings, which will be referred to more particularly
hereinafter, Figure 1 is a cross-sectional view of a
typical embodiment of a conventional 2-layer
laminated plate-shaped sintered body. The numeral
1 represents a sintered body containing high density
boron nitride and the like, and is bonded to a cermet
sintered body 2 through sintering.Figure 2a is a side
view of the point portion of a drill, which has a tip
made of the 2-layer-laminated plate-shaped sintered
body illustrated in Figure 1 in its point portion, and
Figure 2b is a plan view of the drill illustrated in
Figure 2a viewed from its cutting edge side. Two tips
3 and 4 consisting of the 2-layer-laminated plate
shaped sintered body illustrated in Figure 1 are
brazed, at their cermet sintered bodies 2 and 2'
sides, to the grooves of a shank 5, which is made of
steel or cemented carbide, of a drill through silver
solders 6 and 7 respectively. In this case, the two tips
3 and 4 must be brazed, symmetrically with respect
to the rotation axis of the drill, to the shank 5 of the
drill, and moreover they must be separately posi
tioned and brazed.Therefore, even when the tips are
symmetrically subjected to stresses, the stresses
cannot be compensated, and must be supported by
the brazed surface of only one tip. Accordingly, the
brazed surface is exposed to a very high load, and
cutting under high loads cannot be carried out.
The object of the present invention is to obviate
the above described drawbacks and to provide a
high hardness cutting tool capable of cutting satis
factorily even under high loads.
The present invention provides a high hardness
cutting tool comprising a rotary tool and a 3-layer
laminated plate-shaped sintered body bonded to the
point of the rotary tool, said 3-layer-laminated
plate-shaped sintered body consisting of a high
hardness plate-shaped sintered body containing a
high density boron nitride and/or diamond and two
plate-shaped cermet sintered body layers, said high hardness plate-shaped sintered body being interposed between the two plate-shaped cermet sintered body layers and adhered thereto.
For a better understanding of the invention, reference is made to the accompanying drawings, in which:
Figure 1 is a cross-sectional view of a typical embodiment of a conventional 2-layer-laminated plate-shaped sintered body hereinbefore explained;
Figure 2a is a side view of the point portion of a drill, which has a tip made of the 2-layer-laminated plate-shaped sintered body illustrated in Figure 1 in its point portion;
Figure 2b is a plan view of the drill illustrated in
Figure 2a from its cutting edge side;
Figure 3 is a cross-sectional view of a 3-layerlaminated plate-shaped sintered body for a tool according to the present invention;
Figure 4a is a side view of the point portion of a drill, which has a tip made of a 3-layer-laminated plate-shaped sintered body illustrated in Figure 3 in its point portion; and
Figure 4b is a plan view of the drill illustrated in
Figure 4a viewed from its cutting edge side.
The present invention will be explained in more detail referring to the drawings.
Figure 3 is a cross-sectional view of a 3-layerlaminated plate-shaped sintered body for a tool according to the present invention. The same numerals in Figures 1 and 3 indicate the same members.
The 3-layer-laminated plate-shaped sintered body consists of a sintered body 1 containing high density boron nitride and the like and two plate-shaped cermet sintered bodies 2 and 2', said sintered body 1 being interposed between the cermet sintered bodies 2 and 2' and bonded thereto through sintering. Figure 4a is a side view of the point portion of a drill, which has a tip made of the 3-layer-laminated plate-shaped sintered body illustrated in Figure 3 in its point portion, and Figure 4b is a plan view of the drill illustrated in Figure 4a viewed from its cutting edge side. The same numerals in Figures 2 and 4 indicate the same members.One tip consisting of the 3-layer-laminated plate-shaped sintered body illustrated in Figure 3 is brazed to the grooves of the shank Sofa drill through silver solders 6 and 7 such that the cermet sintered bodies 8 and 9 are located symmetrically with respect to the rotation axis of the drill. After the brazing of the tip to the drill, a part of each cermet sintered body of the 3-layer-laminated plate-shaped sintered body is removed so as to form an inclined or rake face and to form a cutting edge of the drill.
In the above described conventional drill, the cutting edge is formed by the use of two sintered body tips containing high density boron nitride. On the contrary, in the drill according to the present invention, the cutting edge is formed by the use of one sintered body tip only. When the cutting edge of a drill is formed of two tips, even in the case where a strain acts symmetrically upon the cutting edge, all the strain acts upon the silver soldered surfaces of the respective tips, and hence the weakly brazed portion is subjected to an overload, and cutting under high loads cannot be carried out.On the contrary, when the cutting edge of a drill is formed of one tip in accordance with the invention, a strain acting symmetrically upon the cutting edge is compensated and acts as a strain for the whole tip, and hence a strain higher than the strain which causes peeling and deformation of silver solder can be applied to a sintered body containing high density boron nitride and the like and having a strength remarkably higher than that of silver solder, and cutting under very high loads can be carried out.
When a strain is asymmetrically applied to the edge surfaces formed of one tip according to the present invention, the strain is distributed to the brazed surfaces at both edge surfaces due to the fact that both edge surfaces are structurally connected to each other, and therefore the load imposed on the edge surfaces is relatively low and is a half of the load imposed to the edge surfaces, which are formed by brazing separately two tips, and cutting under high loads can be carried out by the use of the cutting edge formed of one tip. Moreover, when two tips are brazed to the point of a drill, proper positions for the respective tips must be determined, while when one tip is brazed to the point of a drill, such troublesome procedure is not necessary, and a proper position can be determined by one positioning operation only.
The above described explanation has been carried out with respect to a rotary drill bit. However, of course, the present invention exhibits similar effects and merits with respect to other rotary tools, such as two-flute end mills, reamers and the like, which have a structure similar to that of a drill.
Claims (3)
1. A high hardness cutting tool comprising a rotary tool and a 3-layer-laminated plate-shaped sintered body bonded to the point of the rotary tool, said 3-layer-laminated plate-shaped sintered body consisting of a high hardness plate-shaped sintered body containing a high density boron nitride and/or diamind and two plate-shaped cermet sintered body
layers, said high hardness plate-shaped sintered
body neing interposed between the two plateshaped cermet sintered body layers and adhered thereto.
2. A high hardness cutting tool according to
claim 1, wherein a part of each of the cermet sintered
bodies, which bodies are located symmetrically with
respect to the rotation axis of the 3-layer-laminated
plate-shaped sintered body, is removed to expose a
part of the high hardness plate-shaped sintered body
containing high density boron nitride and/or di
amond so as to form inclined or rake faces.
3. A high hardness cutting tool substantially as
herein described with reference to Figures 3, 4a and
4b of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13865980A JPS5766805A (en) | 1980-10-06 | 1980-10-06 | Cutting tool of high hardness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2085769A true GB2085769A (en) | 1982-05-06 |
| GB2085769B GB2085769B (en) | 1984-06-20 |
Family
ID=15227133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8129961A Expired GB2085769B (en) | 1980-10-06 | 1981-10-05 | High hardness cutting tool |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5766805A (en) |
| DE (1) | DE3139161C2 (en) |
| GB (1) | GB2085769B (en) |
| SE (1) | SE451682C (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0104430A2 (en) * | 1982-09-02 | 1984-04-04 | Hartmetallwerkzeugfabrik Andreas Maier Gmbh + Co. Kg | Rotary cutting tool and method of making it |
| EP0180243A2 (en) * | 1984-11-01 | 1986-05-07 | Sumitomo Electric Industries Limited | Composite sintered material having sandwich structure |
| US4671710A (en) * | 1982-10-29 | 1987-06-09 | Nippon Oil & Fats Co., Ltd. | Drill bit |
| US4762445A (en) * | 1985-06-03 | 1988-08-09 | Precorp, Inc. | Composite sintered twist drill |
| US4802799A (en) * | 1987-06-10 | 1989-02-07 | Marken Tool Company | Drill bit |
| US4991467A (en) * | 1989-08-14 | 1991-02-12 | Smith International, Inc. | Diamond twist drill blank |
| US5031484A (en) * | 1990-05-24 | 1991-07-16 | Smith International, Inc. | Diamond fluted end mill |
| US5065647A (en) * | 1990-08-27 | 1991-11-19 | Ford Motor Company | Bit for drilling cast iron |
| US5070748A (en) * | 1990-05-24 | 1991-12-10 | Smith International, Inc. | Diamond fluted end mill |
| EP0488623A2 (en) * | 1990-11-26 | 1992-06-03 | De Beers Industrial Diamond Division (Proprietary) Limited | Cutting insert for a rotary cutting tool |
| US5195403A (en) * | 1991-03-01 | 1993-03-23 | De Beers Industrial Diamon Division Limited | Composite cutting insert |
| US5458211A (en) * | 1994-02-16 | 1995-10-17 | Dennis; Thomas M. | Spade drill bit construction |
| US6152660A (en) * | 1997-12-22 | 2000-11-28 | Papajewski; Joerg | Drilling tool for bores in solid material |
| EP1334787A1 (en) * | 2002-02-01 | 2003-08-13 | Kennametal Inc. | Rotary cutting tool |
| EP1611982A1 (en) * | 2004-07-01 | 2006-01-04 | Unimerco A/S | A reaming tool and a process for manufacturing such reaming tool |
| US12152500B2 (en) | 2018-06-08 | 2024-11-26 | General Electric Company | Composite component modifications |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5912512U (en) * | 1982-07-14 | 1984-01-26 | 小林 義信 | carbide drill |
| JPS5959308A (en) * | 1982-09-29 | 1984-04-05 | Nippon Oil & Fats Co Ltd | Extremely-hard cutting tool |
| CA1233347A (en) * | 1983-07-21 | 1988-03-01 | John A. Bunting | Printed circuit board drill and method of manufacture |
| JPS6134108A (en) * | 1984-07-26 | 1986-02-18 | Daijietsuto Kogyo Kk | High-hardness composite sintered body for brazing tool |
| US4625593A (en) * | 1984-08-07 | 1986-12-02 | Schmotzer Norman H | Wood drill and method of construction |
| JPS6195808A (en) * | 1984-10-17 | 1986-05-14 | Sumitomo Electric Ind Ltd | drilling tool |
| DE3527933A1 (en) * | 1985-04-23 | 1986-10-23 | HAWERA Präzisionswerkzeuge GmbH, 7980 Ravensburg | Sintered-carbide twist drill |
| US5195404A (en) * | 1987-06-18 | 1993-03-23 | Notter Theo A | Drill bit with cutting insert |
| CN103658769B (en) * | 2012-09-26 | 2016-12-07 | 深圳市中天精密工具有限公司 | Polycrystalline diamond compact bit and manufacture method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2064024B2 (en) * | 1970-12-28 | 1973-02-08 | Gebruder Heller, 2801 Uphusen | DRILL |
-
1980
- 1980-10-06 JP JP13865980A patent/JPS5766805A/en active Granted
-
1981
- 1981-10-01 DE DE19813139161 patent/DE3139161C2/en not_active Expired
- 1981-10-05 GB GB8129961A patent/GB2085769B/en not_active Expired
- 1981-10-05 SE SE8105843A patent/SE451682C/en not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| NONE * |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0104430A2 (en) * | 1982-09-02 | 1984-04-04 | Hartmetallwerkzeugfabrik Andreas Maier Gmbh + Co. Kg | Rotary cutting tool and method of making it |
| EP0104430A3 (en) * | 1982-09-02 | 1985-04-17 | Maier Kg Andreas | Rotary cutting tool and method of making it |
| US4679971A (en) * | 1982-09-02 | 1987-07-14 | Hartmetallwerkzeugfabrik Andreas Maier Gmbh & Co. Kg | Rotary cutting tool and process for making same |
| US4671710A (en) * | 1982-10-29 | 1987-06-09 | Nippon Oil & Fats Co., Ltd. | Drill bit |
| EP0180243A2 (en) * | 1984-11-01 | 1986-05-07 | Sumitomo Electric Industries Limited | Composite sintered material having sandwich structure |
| EP0180243A3 (en) * | 1984-11-01 | 1987-10-14 | Sumitomo Electric Industries Limited | Composite sintered material having sandwich structure |
| US4762445A (en) * | 1985-06-03 | 1988-08-09 | Precorp, Inc. | Composite sintered twist drill |
| US4802799A (en) * | 1987-06-10 | 1989-02-07 | Marken Tool Company | Drill bit |
| US4991467A (en) * | 1989-08-14 | 1991-02-12 | Smith International, Inc. | Diamond twist drill blank |
| US5031484A (en) * | 1990-05-24 | 1991-07-16 | Smith International, Inc. | Diamond fluted end mill |
| US5070748A (en) * | 1990-05-24 | 1991-12-10 | Smith International, Inc. | Diamond fluted end mill |
| US5065647A (en) * | 1990-08-27 | 1991-11-19 | Ford Motor Company | Bit for drilling cast iron |
| EP0488623A2 (en) * | 1990-11-26 | 1992-06-03 | De Beers Industrial Diamond Division (Proprietary) Limited | Cutting insert for a rotary cutting tool |
| EP0488623A3 (en) * | 1990-11-26 | 1993-03-03 | De Beers Industrial Diamond Division (Proprietary) Limited | Cutting insert for a rotary cutting tool |
| US5232320A (en) * | 1990-11-26 | 1993-08-03 | Klaus Tank | Cutting insert for a rotary cutting tool |
| AU647549B2 (en) * | 1990-11-26 | 1994-03-24 | De Beers Industrial Diamond Division (Proprietary) Limited | Cutting insert for a rotary cutting tool |
| US5299471A (en) * | 1990-11-26 | 1994-04-05 | Klaus Tank | Cutting insert for a rotary cutting tool |
| US5195403A (en) * | 1991-03-01 | 1993-03-23 | De Beers Industrial Diamon Division Limited | Composite cutting insert |
| US5458211A (en) * | 1994-02-16 | 1995-10-17 | Dennis; Thomas M. | Spade drill bit construction |
| US6152660A (en) * | 1997-12-22 | 2000-11-28 | Papajewski; Joerg | Drilling tool for bores in solid material |
| EP1334787A1 (en) * | 2002-02-01 | 2003-08-13 | Kennametal Inc. | Rotary cutting tool |
| US6929434B2 (en) | 2002-02-01 | 2005-08-16 | Kennametal Inc. | Rotary cutting tool |
| EP1611982A1 (en) * | 2004-07-01 | 2006-01-04 | Unimerco A/S | A reaming tool and a process for manufacturing such reaming tool |
| US12152500B2 (en) | 2018-06-08 | 2024-11-26 | General Electric Company | Composite component modifications |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3139161A1 (en) | 1982-05-06 |
| JPS646882B2 (en) | 1989-02-06 |
| SE8105843L (en) | 1982-04-07 |
| SE451682C (en) | 1988-02-04 |
| JPS5766805A (en) | 1982-04-23 |
| SE451682B (en) | 1987-10-26 |
| DE3139161C2 (en) | 1983-05-11 |
| GB2085769B (en) | 1984-06-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |