EP1228856A2 - Werkzeug zum Zusammenpressen von Pulver - Google Patents

Werkzeug zum Zusammenpressen von Pulver Download PDF

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Publication number
EP1228856A2
EP1228856A2 EP02445013A EP02445013A EP1228856A2 EP 1228856 A2 EP1228856 A2 EP 1228856A2 EP 02445013 A EP02445013 A EP 02445013A EP 02445013 A EP02445013 A EP 02445013A EP 1228856 A2 EP1228856 A2 EP 1228856A2
Authority
EP
European Patent Office
Prior art keywords
punches
compacting
tool
powder
cavity
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Withdrawn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
EP02445013A
Other languages
English (en)
French (fr)
Other versions
EP1228856A3 (de
Inventor
Enrico Cacciorni
Jonas Jerklind
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.)
SKF AB
Original Assignee
SKF 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 SKF AB filed Critical SKF AB
Publication of EP1228856A2 publication Critical patent/EP1228856A2/de
Publication of EP1228856A3 publication Critical patent/EP1228856A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould
    • 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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space

Definitions

  • the present invention relates to a method of compacting powder disposed in a matrix having a through-going cavity, at least two lower punches and at least two punches, being moved different lengths in order to create a compacted body having uniform density and different thickness in different parts thereof.
  • the invention also relates to a powder compacting tool for performing the method.
  • the manufacturing of compacted bodies having different thickness in different parts thereof is conventionally made by powder compacting tools in which the punches are moved with a low velocity, typically by velocities less than 1 m/s. Separate upper and lower punches for the parts of different thickness are used.
  • a low velocity typically by velocities less than 1 m/s.
  • Separate upper and lower punches for the parts of different thickness are used.
  • the densities in the different parts of the compacted body are the same during every moment in the whole compacting operation.
  • Multi-plate systems to move the separate punches with different velocities are necessary in order to obtain the same density throughout the compacting operation. Such a manufacturing leads to a complicated tool with many components and a rather sophisticated control system.
  • Powder compacting tools in which the punches are moved with high velocities, typically by velocities higher than 2 m/s, are used to create compacted bodies having higher densities than compacted bodies produced by the conventional low velocity powder compacting tools.
  • the objectives of the present invention are to fulfil this need and also to provide a powder compacting tool for producing bodies having different thickness in different parts thereof which has few components and which can be used in a simple manner during a high velocity compacting operation.
  • the punches are actuated by the same ram unit.
  • the forming chamber is defined by the side wall of a cavity in a matrix of a powder compacting tool and the end walls of at least two lower punches and at least two upper punches having different axial lengths, and the method comprises the following steps;
  • the invention also relates to a powder compacting tool comprising a matrix having a through-going cavity, a first and a second upper punch, which are movable in the axial direction of the cavity, and at least two lower punches, characterised in that the upper punches have different axial lengths and that the tool comprises a single ram for moving the upper punches in sequence towards the at least two lower punches during a compacting operation and means are for holding the at least two lower punches stationary during a compacting operation.
  • the tool comprises a single ram for moving the upper punches in sequence towards the at least two lower punches during a compacting operation and means are for holding the at least two lower punches stationary during a compacting operation.
  • the tool comprises a first and a second upper and lower punches, the first upper and lower punches and the second upper and lower punches being opposite to each other.
  • the cavity of the matrix is furthermore cylindrical and a core pin is disposed in the cavity and extended along the symmetry axis of the cavity.
  • a powder compacting tool 1 for the manufacture of annular bodies having a annular flange projecting from the central portion of the outer side thereof is schematically shown in different stages of a compacting operation.
  • the tool 1 comprises a matrix 2 with a through-going cavity in which a first and second upper punch 3 and 4, respectively and a first and second lower punch 5 and 6, respectively are vertically movable by suitable means.
  • a first and second upper punch 3 and 4 respectively and a first and second lower punch 5 and 6, respectively are vertically movable by suitable means.
  • the first upper punch 3 is shorter than the second upper punch 4 and the upper ends of the lower punches 5,6 is axially displaced in relation to each other.
  • the tool also comprises a core pin 7 and a ram 8.
  • the tool works in the following way.
  • the upper punches 3 and 4 have been moved out of the cavity in the matrix and the lower punches are moved upwards so that upper end of the second lower punch 6 is disposed nearer the upper side of the matrix than the upper end of the first lower punch 5.
  • powder is filled into the space defined by the side walls of the cavity in the matrix 2, the core pin 7 and the second lower punch 6 and the upper end wall of the first lower punch 5.
  • the first and second upper punches are moved downwards until they reaches the upper side of the matrix and thereafter are all the punches moved downwards to the positions shown in Figure 1.
  • Figure 1 the positions of the punches before the beginning of the compacting operation are shown, the punches and the core pin defining a forming chamber C.
  • the first upper punch 3 is disposed above the second upper punch 4 by a distance d.
  • the compacting operation starts by actuating the ram 8 to move downwards by a sequence of strokes or by a press force F.
  • the first upper punch 3 is influenced by the ram 8, whereby the compacting of the powder in the forming chamber C begins for the part of the powder that lies between the end surfaces of the first upper and lower punches 3 and 5.
  • the lower punches 5 and 6 are held stationary during the whole compacting operation.
  • Figure 3 shows the positions of the punches in the end of the pressing operation, the compacted body in the forming chamber C having a central annular body with a flange, the thickness of the flange being considerably smaller than the thickness of the central body.
  • the ejecting of the compacted body is made by moving all of the punches out of the cavity of the matrix by moving the lower punches upwards. Thereafter, punches 3 and 5 are pushed against the compact body by a small force and the punches 4 and 6 are retracted. Finally, the compact body is released from the punches 3 and 5.
  • the distance d is so chosen that the compacted material in the central body and in the flange has the same density, i.e the powder column between the opposing end surfaces of the first upper punch 3 and the first lower punch 5 has been shortened by the same percentage as the powder column between the opposing end surfaces of the second upper punch 4 and the second lower punch 6.
  • the tool can of course be used to produce compact bodies having other configuration that the one shown in the Figures, for example a compact body in which the flange is projecting from the lower part of the central body. It is also possible to produce bodies being more thick in the outer part than in the central part by making the inner punch longer than the outer punch, i.e to change the positions of the first and second punches in the described embodiment. If cylindrical bodies are to be produced instead of annular bodies, the core pin is removed.
  • the bodies produced can have other forms than circular, for example square, triangular , U-shape etc. It is also possible, but not preferred, to only use one lower punch having an upper end surface adapted to the configuration of the underside of the compact body to be produced.
  • the filling operation and the ejecting operation will be more complicated. Furthermore, it is also possible to provide the tool with more than two upper and lower punches if a compact body having more than two portions of different thickness is to be produced and the number of lower punches can be different from the number of upper punches, in dependence of the shape of the compact body to be manufactured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
EP02445013A 2001-02-06 2002-02-04 Werkzeug zum Zusammenpressen von Pulver Withdrawn EP1228856A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0100364A SE0100364D0 (sv) 2001-02-06 2001-02-06 Powder compacting tool
SE0100364 2001-02-06

Publications (2)

Publication Number Publication Date
EP1228856A2 true EP1228856A2 (de) 2002-08-07
EP1228856A3 EP1228856A3 (de) 2002-08-28

Family

ID=20282862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02445013A Withdrawn EP1228856A3 (de) 2001-02-06 2002-02-04 Werkzeug zum Zusammenpressen von Pulver

Country Status (3)

Country Link
EP (1) EP1228856A3 (de)
CN (1) CN1369368A (de)
SE (1) SE0100364D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003008131A2 (en) * 2001-07-20 2003-01-30 Hawk Precision Components Group, Inc. Apparatus and method for high-velocity compaction of multiple-level parts
CN106891279A (zh) * 2017-03-07 2017-06-27 郑州磨料磨具磨削研究所有限公司 异形砂轮成型模具及其压头组件和压头
CN109781937A (zh) * 2017-11-15 2019-05-21 罗伯特·博世有限公司 用于传感器的传感器元件的密封元件和其制造方法
JP2021110031A (ja) * 2019-12-31 2021-08-02 ウォンジン アルミニウム 高強度複合素材の製造装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104162851B (zh) * 2014-07-29 2017-01-25 郑州磨料磨具磨削研究所有限公司 压头及使用该压头的压制成型模具和压制成型方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593366A (en) * 1968-12-11 1971-07-20 Wolverine Pentronix Multiple punch tool set for powder compacting press
US3664785A (en) * 1968-12-13 1972-05-23 Birmingham Small Arms Co Ltd Presses for production of complex components
DE19816969A1 (de) * 1998-04-17 1999-10-21 Komage Gellner Gmbh & Co Masch Vorrichtung für die Herstellung von Pulverpreßlingen
JP2000326100A (ja) * 1999-05-20 2000-11-28 Hitachi Powdered Metals Co Ltd 傾斜面を有する圧粉体の成形方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593366A (en) * 1968-12-11 1971-07-20 Wolverine Pentronix Multiple punch tool set for powder compacting press
US3664785A (en) * 1968-12-13 1972-05-23 Birmingham Small Arms Co Ltd Presses for production of complex components
DE19816969A1 (de) * 1998-04-17 1999-10-21 Komage Gellner Gmbh & Co Masch Vorrichtung für die Herstellung von Pulverpreßlingen
JP2000326100A (ja) * 1999-05-20 2000-11-28 Hitachi Powdered Metals Co Ltd 傾斜面を有する圧粉体の成形方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14, 5 March 2001 (2001-03-05) & JP 2000 326100 A (HITACHI POWDERED METALS CO LTD), 28 November 2000 (2000-11-28) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003008131A2 (en) * 2001-07-20 2003-01-30 Hawk Precision Components Group, Inc. Apparatus and method for high-velocity compaction of multiple-level parts
WO2003008131A3 (en) * 2001-07-20 2003-11-27 Hawk Prec Components Group Inc Apparatus and method for high-velocity compaction of multiple-level parts
CN106891279A (zh) * 2017-03-07 2017-06-27 郑州磨料磨具磨削研究所有限公司 异形砂轮成型模具及其压头组件和压头
CN106891279B (zh) * 2017-03-07 2019-03-01 郑州磨料磨具磨削研究所有限公司 异形砂轮成型模具及其压头组件和压头
CN109781937A (zh) * 2017-11-15 2019-05-21 罗伯特·博世有限公司 用于传感器的传感器元件的密封元件和其制造方法
JP2021110031A (ja) * 2019-12-31 2021-08-02 ウォンジン アルミニウム 高強度複合素材の製造装置
JP7009579B2 (ja) 2019-12-31 2022-01-25 ウォンジン アルミニウム 高強度複合素材の製造装置

Also Published As

Publication number Publication date
SE0100364D0 (sv) 2001-02-06
EP1228856A3 (de) 2002-08-28
CN1369368A (zh) 2002-09-18

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