GB2085769A - High hardness cutting tool - Google Patents

High hardness cutting tool Download PDF

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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
Application number
GB8129961A
Other versions
GB2085769B (en
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.)
NOF Corp
Original Assignee
Nippon Oil and Fats Co Ltd
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 Nippon Oil and Fats Co Ltd filed Critical Nippon Oil and Fats Co Ltd
Publication of GB2085769A publication Critical patent/GB2085769A/en
Application granted granted Critical
Publication of GB2085769B publication Critical patent/GB2085769B/en
Expired legal-status Critical Current

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)
  • Laminated Bodies (AREA)
  • Powder Metallurgy (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.
GB8129961A 1980-10-06 1981-10-05 High hardness cutting tool Expired GB2085769B (en)

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 (15)

* Cited by examiner, † Cited by third party
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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
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 Boring 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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2064024B2 (en) * 1970-12-28 1973-02-08 Gebruder Heller, 2801 Uphusen DRILL

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NONE *

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0104430A2 (en) * 1982-09-02 1984-04-04 Hartmetallwerkzeugfabrik Andreas Maier Gmbh + Co. Kg Rotary cutting tool and method of making it
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
US5070748A (en) * 1990-05-24 1991-12-10 Smith International, Inc. Diamond fluted end mill
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
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

Also Published As

Publication number Publication date
JPS5766805A (en) 1982-04-23
SE451682B (en) 1987-10-26
DE3139161C2 (en) 1983-05-11
SE451682C (en) 1988-02-04
DE3139161A1 (en) 1982-05-06
GB2085769B (en) 1984-06-20
SE8105843L (en) 1982-04-07
JPS646882B2 (en) 1989-02-06

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee