EP2221131A1 - Verfahren zur Herstellung eines kompakten Puder- und gesinterten Verbundkörpers - Google Patents

Verfahren zur Herstellung eines kompakten Puder- und gesinterten Verbundkörpers Download PDF

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Publication number
EP2221131A1
EP2221131A1 EP09161550A EP09161550A EP2221131A1 EP 2221131 A1 EP2221131 A1 EP 2221131A1 EP 09161550 A EP09161550 A EP 09161550A EP 09161550 A EP09161550 A EP 09161550A EP 2221131 A1 EP2221131 A1 EP 2221131A1
Authority
EP
European Patent Office
Prior art keywords
powder
powders
filling space
punch
bottom punch
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Withdrawn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
EP09161550A
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English (en)
French (fr)
Inventor
Gustaf Wandebäck
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 Intellectual Property AB
Original Assignee
Sandvik Intellectual Property 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 Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Priority to EP09161550A priority Critical patent/EP2221131A1/de
Publication of EP2221131A1 publication Critical patent/EP2221131A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/34—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses for coating articles, e.g. tablets
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction

Definitions

  • the present invention relates to methods of producing a powder compact and a sintered composite body. It also relates to a powder compact and a sintered composite body.
  • Cutting inserts for metal machining are commonly made by powder metallurgical methods comprising compaction of a powder into a body which is subsequently sintered to consolidate the body.
  • Common materials used for cutting inserts are cemented carbide, cermets, ceramics, and cubic boron nitride.
  • Raw material powder is generally compacted by using a press tool wherein the powder is disposed by a feed shoe into a mould of a desired size and shape and pressed together by two punches, thereby giving a compact of a desired geometrical shape.
  • the object of the invention is therefore to provide a method for producing a powder compact wherein two or more raw material powders can be combined in order to finally provide a sintered composite body.
  • the object of the invention is achieved by a method of producing a powder compact comprising: in a press tool comprising a die, at least two bottom punches and a top punch, - encapsulating a powder B within one or more further powders A, the encapsulated powder B and the one or more powders A having different compositions, the encapsulation being made by stepwise positioning, an inner bottom punch and an outer bottom punch surrounding the inner bottom punch, so that a filling space is provided above a punch after each positioning step, one of the powders A or B are introduced into each filling space provided so that powder B is encapsulated within the one or more powders A, and, pressing the combination of powders between the bottom punches and the top punch thereby forming a compact.
  • the present invention further relates to a powder compact obtainable by the method comprising a pressed powder B encapsulated within one or more pressed powders A, powder B and the one or more powders A having different compositions.
  • the invention further comprises a powder compact comprising a pressed powder B encapsulated within one or more pressed powders A, powders B and the one or more powders A having different compositions.
  • the invention further comprises a method of producing a sintered body comprising the addition of a step of sintering to the method of producing a powder compact.
  • the present invention further relates to a sintered body obtainable by the method comprising a first sintered material encapsulated within at least one further sintered material, the first and further sintered materials differs in at least one characteristic.
  • the invention further comprises a sintered body comprising a first sintered material encapsulated within at least one further sintered material, the first and further sintered materials differs in at least one characteristic.
  • the invention further comprises a cutting tool comprising the sintered body.
  • the method of producing a powder compact suitably comprises:
  • the stepwise positioning suitably comprises, in the following order, a sequence of steps (a), (b) and (c), wherein:
  • the introductions of the one or more powders A and powder B are suitably made by using different feed shoes.
  • the horisontal cross section of the inner and outer bottom punches may be of any geometrical shape, for example circular, square-shaped, rectangular, triangular, oval etc.
  • Fig. 1a shows an embodiment wherein the horisontal cross section is square shaped for both bottom punches.
  • the outer bottom punch and inner bottom punch may also have different horisontal cross sectional shapes, for example, the inner bottom punch may be square shaped whereas the outer bottom punch is circular, or any other combinations such as triangular-circular, circular-square shaped etc.
  • the different compositions of the powders are suitably different chemical composition and/or different particle size.
  • the powders suitably comprises hard material constituents and one or more binder materials. More specifically, the powders may comprise hard particles comprising a carbide, nitride, carbonitride, boride, silicide, oxide or mixtures thereof.
  • the hard particles preferably comprise one or more metal carbides, carbonitrides, borides, silicides, or oxides, wherein the metal may be tungsten, titanium, chromium, tanatalum, vanadium, zirconium, hafnium and niobium.
  • the binder materials are suitably selected from the group of cobalt, nickel, and iron.
  • the powder compact suitably comprises at least one parting line.
  • the at least one parting line results from the bottom punches used in the method.
  • the ratio of the thickness of the at least one pressed powder A of the powder compact to the thickness of the encapsulated pressed powder B at a cross section is suitably from about 0.1 to about 10, preferably from about 0.15 to about 8, more preferably from about 0.15 to about 4, even more preferably from about 0.2 to about 2, most preferably from about 0.2 to about 1.
  • the different characteristic of the first and further sintered materials are suitably at least one of chemical composition, grain size, elastic modulus, hardness, wear resistance, fracture toughness, tensile strength, corrosion resistance, coefficient of thermal expansion and coefficient of thermal conductivity.
  • the first and further sintered materials suitably comprise grains of hard material constituents in a binder phase.
  • the hard material grains suitably comprise a carbide, nitride, carbonitride, boride, silicide, oxide or mixtures thereof.
  • the hard material grains preferably comprise one or more metal carbides, carbonitrides, borides, silicides, or oxides, wherein the metal may be one or more of tungsten, titanium, chromium, tanatalum, vanadium, zirconium, hafnium and niobium.
  • the binder phase suitably comprises a metal selected from the group of cobalt, nickel, and iron.
  • the grain size of the hard material constituents in the sintered materials is suitably from about 0.1 to about 20 ⁇ m, preferably from about 0.5 to about 10 ⁇ m.
  • the ratio of the grain size of the hard material constituents in the encapsulated first sintered material to the grain size of the hard material constituents in at least one of the further sintered materials is ⁇ 0.1 but ⁇ 1, or ⁇ 0.5 but ⁇ 1, or ⁇ 0.7 but ⁇ 1.
  • the ratio of the grain size of the hard material constituents in the encapsulated first sintered material to the grain size of the hard material constituents in at least one of the further sintered materials is > 1 but ⁇ 10, or > 1 but ⁇ 5, or > 1 but ⁇ 3.
  • the ratio of the grain size of the hard material constituents in the encapsulated first sintered material to the grain size of the hard material constituents in at least one of the further sintered materials is 1.
  • the sintered body suitably comprises at least one parting line.
  • the at least one parting line results from the bottom punches used in the method.
  • the ratio of the thickness of the at least one further sintered material of the sintered body to the thickness of the encapsulated first sintered material at a cross section is suitably from about 0.1 to about 10, preferably from about 0.15 to about 8, more preferably from about 0.15 to about 4, even more preferably from about 0.2 to about 2, most preferably from about 0.2 to about 1.
  • the ratio of the degree of shrinking at sintering for the encapsulated pressed powder B of the powder compact to the degree of shrinking at sintering for the pressed one or more powders A is suitably from about 0.8 to about 1.2.
  • the ratio of the degree of shrinking at sintering for the encapsulated pressed powder B of the powder compact to the degree of shrinking at sintering for the pressed one or more powders A is from about 0.9 to about 1.1, preferably from about 0.95 to about 1.05, more preferably 0.98-1.02, most preferably essentially 1.
  • the ratio of the degree of shrinking at sintering for the encapsulated pressed powder B of the powder compact to the degree of shrinking at sintering for the pressed one or more powders A is from about 0.8 to about 0.99, preferably from about 0.9 to about 0.98, more preferably from about 0.95 to about 0.97.
  • the at least one further sintered material enclosing the sintered first material suitably has a residual stress being a net positive tensile stress.
  • the at least one further sintered material enclosing the sintered first material suitably has a residual stress being a net positive compressive stress.
  • further bottom punches may be present situated between the inner and outer bottom punches (see fig. 11 ).
  • At least one of steps (a), (c) and (d) comprises introducing a further powder A onto an already introduced powder A into a filling space, i.e. a filling space is partly filled with a first powder and partly filled with one or more further powders A.
  • the method of the present invention may further comprise the following features:
  • the powder compact according to the invention is preferably shaped as a cutting tool insert, such as a turning insert, milling insert, drilling insert etc.
  • the sintered body according to the invention is preferably a cutting tool insert, such as a turning insert, milling insert, drilling insert etc.
EP09161550A 2009-05-29 2009-05-29 Verfahren zur Herstellung eines kompakten Puder- und gesinterten Verbundkörpers Withdrawn EP2221131A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09161550A EP2221131A1 (de) 2009-05-29 2009-05-29 Verfahren zur Herstellung eines kompakten Puder- und gesinterten Verbundkörpers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09161550A EP2221131A1 (de) 2009-05-29 2009-05-29 Verfahren zur Herstellung eines kompakten Puder- und gesinterten Verbundkörpers

Publications (1)

Publication Number Publication Date
EP2221131A1 true EP2221131A1 (de) 2010-08-25

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EP09161550A Withdrawn EP2221131A1 (de) 2009-05-29 2009-05-29 Verfahren zur Herstellung eines kompakten Puder- und gesinterten Verbundkörpers

Country Status (1)

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EP (1) EP2221131A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455115C1 (ru) * 2011-02-17 2012-07-10 Открытое акционерное общество "Всероссийский институт легких сплавов" (ОАО "ВИЛС") Способ получения переменной структуры по сечению порошковой заготовки
DE102014006374A1 (de) * 2014-05-05 2015-11-05 Gkn Sinter Metals Engineering Gmbh Vorrichtung zur Herstellung eines Rohlings nebst Verfahren hierzu und Rohling
WO2015169740A1 (de) 2014-05-05 2015-11-12 Gkn Sinter Metals Engineering Gmbh Wasserstoffspeicherelement für einen wasserstoffspeicher
JP2016043379A (ja) * 2014-08-21 2016-04-04 三菱マテリアルテクノ株式会社 仮押し装置、粉末成形装置、粉末材料の仮押し方法、及び粉末成形品の製造方法
WO2016124514A1 (de) 2015-02-03 2016-08-11 Gkn Sinter Metals Engineering Gmbh Leises zahnrad und verfahren zur herstellung eines solchen zahnrades
DE102016103051A1 (de) 2016-02-22 2017-08-24 Gkn Sinter Metals Engineering Gmbh Pumpenanordnung
ES2632888A1 (es) * 2016-03-14 2017-09-15 Universidad De Sevilla Dispositivo de compactación de polvos para obtener piezas sinterizadas con porosidad gradiante radial, procedimiento de obtención y uso
EP3403817A1 (de) * 2017-05-18 2018-11-21 Walter Ag Schneidplatte und verfahren und pressform zur herstellung eines grünkörpers der schneidplatte

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255278A (en) * 1964-10-13 1966-06-07 Air Reduction Fuel element manufacture
US4743515A (en) * 1984-11-13 1988-05-10 Santrade Limited Cemented carbide body used preferably for rock drilling and mineral cutting
EP0556914A2 (de) * 1992-02-19 1993-08-25 General Motors Corporation Verfahren zur Herstellung einer magnetischen Anordnung
US5467669A (en) * 1993-05-03 1995-11-21 American National Carbide Company Cutting tool insert
US5543235A (en) 1994-04-26 1996-08-06 Sintermet Multiple grade cemented carbide articles and a method of making the same
US5697046A (en) 1994-12-23 1997-12-09 Kennametal Inc. Composite cermet articles and method of making
US5776593A (en) 1994-12-23 1998-07-07 Kennametal Inc. Composite cermet articles and method of making
US6086980A (en) 1996-12-20 2000-07-11 Sandvik Ab Metal working drill/endmill blank and its method of manufacture
US6511265B1 (en) 1999-12-14 2003-01-28 Ati Properties, Inc. Composite rotary tool and tool fabrication method
WO2003013768A1 (en) * 2001-08-03 2003-02-20 Gkn Sinter Metals, Inc. Method and apparatus for manufacturing multi-material powder metal components
US6685880B2 (en) 2000-11-22 2004-02-03 Sandvik Aktiebolag Multiple grade cemented carbide inserts for metal working and method of making the same
US20070042217A1 (en) 2005-08-18 2007-02-22 Fang X D Composite cutting inserts and methods of making the same
US20080145686A1 (en) 2006-10-25 2008-06-19 Mirchandani Prakash K Articles Having Improved Resistance to Thermal Cracking

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255278A (en) * 1964-10-13 1966-06-07 Air Reduction Fuel element manufacture
US4743515A (en) * 1984-11-13 1988-05-10 Santrade Limited Cemented carbide body used preferably for rock drilling and mineral cutting
EP0556914A2 (de) * 1992-02-19 1993-08-25 General Motors Corporation Verfahren zur Herstellung einer magnetischen Anordnung
US5467669A (en) * 1993-05-03 1995-11-21 American National Carbide Company Cutting tool insert
US5543235A (en) 1994-04-26 1996-08-06 Sintermet Multiple grade cemented carbide articles and a method of making the same
US5776593A (en) 1994-12-23 1998-07-07 Kennametal Inc. Composite cermet articles and method of making
US5697046A (en) 1994-12-23 1997-12-09 Kennametal Inc. Composite cermet articles and method of making
US6086980A (en) 1996-12-20 2000-07-11 Sandvik Ab Metal working drill/endmill blank and its method of manufacture
US6511265B1 (en) 1999-12-14 2003-01-28 Ati Properties, Inc. Composite rotary tool and tool fabrication method
US6685880B2 (en) 2000-11-22 2004-02-03 Sandvik Aktiebolag Multiple grade cemented carbide inserts for metal working and method of making the same
WO2003013768A1 (en) * 2001-08-03 2003-02-20 Gkn Sinter Metals, Inc. Method and apparatus for manufacturing multi-material powder metal components
US20070042217A1 (en) 2005-08-18 2007-02-22 Fang X D Composite cutting inserts and methods of making the same
US20080145686A1 (en) 2006-10-25 2008-06-19 Mirchandani Prakash K Articles Having Improved Resistance to Thermal Cracking

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455115C1 (ru) * 2011-02-17 2012-07-10 Открытое акционерное общество "Всероссийский институт легких сплавов" (ОАО "ВИЛС") Способ получения переменной структуры по сечению порошковой заготовки
DE102014006374A1 (de) * 2014-05-05 2015-11-05 Gkn Sinter Metals Engineering Gmbh Vorrichtung zur Herstellung eines Rohlings nebst Verfahren hierzu und Rohling
WO2015169740A1 (de) 2014-05-05 2015-11-12 Gkn Sinter Metals Engineering Gmbh Wasserstoffspeicherelement für einen wasserstoffspeicher
WO2015169756A2 (de) 2014-05-05 2015-11-12 Gkn Sinter Metals Engineering Gmbh Vorrichtung zur herstellung eines rohlings nebst verfahren hierzu und rohling
US11572272B2 (en) 2014-05-05 2023-02-07 Gkn Sinter Metals Engineering Gmbh Process for producing a hydrogen storage means
EP4094826A1 (de) 2014-05-05 2022-11-30 GKN Sinter Metals Engineering GmbH Vorrichtung zur herstellung eines rohlings nebst verfahren hierzu und rohling
JP2017520403A (ja) * 2014-05-05 2017-07-27 ゲーカーエン シンター メタルズ エンジニアリング ゲーエムベーハー ブランク製造装置、ブランク製造方法、及びブランク
EP4085993A1 (de) 2014-05-05 2022-11-09 GKN Sinter Metals Engineering GmbH Vorrichtung zur herstellung eines rohlings nebst verfahren hierzu und rohling
US10919250B2 (en) 2014-05-05 2021-02-16 Gkn Sinter Metals Engineering Gmbh Apparatus for producing a blank, also a method for this purpose and a blank
JP2016043379A (ja) * 2014-08-21 2016-04-04 三菱マテリアルテクノ株式会社 仮押し装置、粉末成形装置、粉末材料の仮押し方法、及び粉末成形品の製造方法
US10890241B2 (en) 2015-02-03 2021-01-12 Gkn Sinter Metals Engineering Gmbh Quiet gear wheel and method for producing such a gear wheel
DE102015201873A1 (de) 2015-02-03 2016-08-18 Gkn Sinter Metals Engineering Gmbh Leises Zahnrad
WO2016124514A1 (de) 2015-02-03 2016-08-11 Gkn Sinter Metals Engineering Gmbh Leises zahnrad und verfahren zur herstellung eines solchen zahnrades
EP3617448A1 (de) 2016-02-22 2020-03-04 GKN Sinter Metals Engineering GmbH Pumpenanordnung
WO2017144499A1 (de) 2016-02-22 2017-08-31 Gkn Sinter Metals Engineering Gmbh Pumpenanordnung mit axialfluss-elektroantrieb
DE102016103051A1 (de) 2016-02-22 2017-08-24 Gkn Sinter Metals Engineering Gmbh Pumpenanordnung
ES2632888A1 (es) * 2016-03-14 2017-09-15 Universidad De Sevilla Dispositivo de compactación de polvos para obtener piezas sinterizadas con porosidad gradiante radial, procedimiento de obtención y uso
EP3403817A1 (de) * 2017-05-18 2018-11-21 Walter Ag Schneidplatte und verfahren und pressform zur herstellung eines grünkörpers der schneidplatte
WO2018210634A1 (en) * 2017-05-18 2018-11-22 Walter Ag Cutting plate and method and compression mold for producing a green body of the cutting plate
KR20200008553A (ko) * 2017-05-18 2020-01-28 발터 악티엔게젤샤프트 절삭 플레이트와, 절삭 플레이트의 그린 바디를 제조하기 위한 방법 및 압축 몰드

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