US20020022063A1 - Device for forming annular articles from powder material - Google Patents

Device for forming annular articles from powder material Download PDF

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Publication number
US20020022063A1
US20020022063A1 US09/839,154 US83915401A US2002022063A1 US 20020022063 A1 US20020022063 A1 US 20020022063A1 US 83915401 A US83915401 A US 83915401A US 2002022063 A1 US2002022063 A1 US 2002022063A1
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United States
Prior art keywords
core pin
matrix
punch
pressing punch
molding cavity
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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
Application number
US09/839,154
Inventor
Bo Goransson
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SKF Nova AB
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Individual
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Filing date
Publication date
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Assigned to SKF NOVA AB reassignment SKF NOVA AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GORANSSON, BO
Publication of US20020022063A1 publication Critical patent/US20020022063A1/en
Abandoned legal-status Critical Current

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    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • 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
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • 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
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the present invention relates to a device for forming tubular articles from powder material. More particularly, the present invention is directed to a device comprising an upper pressing punch, a lower punch, a core pin and a matrix having an inner periphery corresponding to the outer periphery of the upper and lower punch, a molding cavity being defined between the upper and lower punch, the core pin and the matrix, whereby the core pin is movable in relation to the matrix.
  • a problem encountered when making tubular articles, such as bearing rings, by compacting powdered metal located in a mold cavity having a stationary bottom wall and stationary side walls is uneven compacting of the articles, especially if the height of the tubular article is large in comparison with the wall thickness. This is due to friction between the particles in the metal powder and the walls of the molding cavity during the compacting step so that a large part of the compacting energy is consumed as frictional heat, the result being that the compacted tubular article is more compacted in the parts lying nearest the pressing punch than in other parts.
  • EP-A1-0 450 784 discloses a device for forming cylindrical compacts. In this device all the components except the lower punch is moved with different travelling speeds during the compacting step, which leads to a complicated and expensive construction of the device.
  • An object of the present invention is to provide a device in which the compacting of the tubular articles is more even than in a device having a mold cavity with a stationary bottom wall and stationary side walls, and which device is of a simple construction.
  • the present invention provides a device for forming tubular articles from powder material comprising an upper pressing punch, a lower punch, a core pin and a matrix having an inner periphery corresponding to an outer periphery of the upper and lower punch, a molding cavity being defined between the upper and lower punch, the core pin and the matrix, whereby the core pin is movable in relation to the matrix, wherein the upper pressing punch is arranged to actuate movement of the core pin or the matrix during compacting of a powder in the molding cavity so that the pressing punch and the core pin or the matrix move together.
  • the core pin is movable between a first position in which the upper end thereof is located in line with, or above, the upper wall of the matrix, and a second position in which the upper wall of the core pin is located below the upper wall of the matrix.
  • the core pin can advantageously be biased against the first position.
  • the upper pressing punch has in a first position a part of its lower wall in contact with the upper end wall of the core pin, so that the pressing punch will force the core pin to follow downwards movement thereof from its first position, and the upper pressing punch is preferably moveable upwards from its first position in order to open up the molding cavity for insertion of powder materials.
  • the lower punch can advantageously be upwardly moveable in order to eject a compacted article from the molding cavity.
  • the core pin is an integral part of the upper pressing punch.
  • tubular articles includes articles having various sectional shapes such as polygonal (e.g. - rectangular), circular, etc.
  • the sectional shape can also be an open tubular shape (i.e. - with other shapes than circular), for example a U-shaped section.
  • FIG. 1 is a schematic sectional view of a device according to a preferred embodiment of the invention, showing the device immediately before the pressing step, and
  • FIG. 2 is a view similar to FIG. 1, showing the device in the end of the pressing step.
  • the device in FIGS. 1 and 2 comprises a cylindrical core pin 1 and an annular matrix 2 , which has an inner diameter that is larger than the diameter of the core pin 1 so that a cylindrical space is defined between the core pin and the matrix.
  • a lower punch 3 having the form of a hollow cylinder is dimensioned to fit into the annular space between the core pin and the matrix and the upper wall of the lower punch 3 constitutes the bottom wall of a molding cavity 4 .
  • a work piece 5 of powder metal is disposed in this cavity in FIG. 1.
  • a pressing punch 6 having a cylindrical body with a diameter corresponding to the inner diameter of the matrix 2 is slidable within the inner cylindrical space defined by the matrix.
  • the lower end surface 7 of the pressing punch has a central recess into which the upper end portion 8 of the core pin 1 is fitted.
  • the core pin 1 is slidable within the lower punch 3 and is biased to a first position by a spring 9 disposed between the lower end surface of the core pin and an opening in the foundation. In the first position of the core pin its upper end surface is flush with the upper surface of the matrix 2 in order to facilitate removal of superfluous powder filled into the molding cavity. In FIG. 1, the core pin is disposed in its first position.
  • FIG. 1 the pressing punch 6 is placed in a first position from which the step of compacting the work piece 5 takes place by pressing the punch 6 downwardly with a pressing force P.
  • the surface of the central recess in its lower end surface 7 abuts the surface of the upper end portion 8 of the core pin and the side wall of the upper end portion 8 abuts the vertical wall of the recess in the lower end surface 7 of the pressing punch.
  • the core pin is thus forced to follow downward movement of the pressing punch from its first position.
  • the pressing punch and the core pin will thus move together.
  • the friction forces created between the moving wall of the core pin and the particles in the powder material 5 disposed in the molding cavity 4 will have an opposite direction relative to the frictional forces created between the particles in the powder material and the stationary matrix wall.
  • the friction forces created during the pressing step will thus balance each other and the powder material will be more evenly compacted throughout the height thereof.
  • FIG. 2 the inventive device is shown in the end of the pressing step.
  • the powder material in the molding cavity being compacted to an annular ring 10 .
  • the lower punch 3 is by some suitable means arranged to act as a knock-out punch after the pressure P on the pressing punch 6 has been released, so as to eject the finished ring 10 from the molding cavity.
  • hydraulic pistons disposed in the foundation under the lower punch 3 can be arranged push the lower punch 3 upwardly when actuated.
  • the upper pressing punch 6 is moved upwards to a position above the position shown in FIG. 1 in order to facilitate removal of the ring 10 from the molding cavity 4 .
  • the device is used also for compacting powder material in the form of preshaped tubular articles or green bodies.
  • the devices should therefore preferably be designed to facilitate insertion of such preformed articles into the molding cavity.
  • the described embodiment can of course be modified in several respects while remaining within the scope of the invention.
  • the pressing punch and the core pin can form an integral piece.
  • the pressing punch can have a totally flat lower end surface instead of the recess disclosed in the described embodiment.
  • this is not preferred since the guiding of the core pin will then be decreased.
  • the matrix can be arranged to move together with the pressing punch during the pressing step instead of the core pin, which in such an embodiment is stationary. The scope of invention should therefore be limited only of the wording of the enclosed patent claims.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

The present invention relates to a device for forming tubular articles from powder material including an upper pressing punch, a lower punch, a core pin and a matrix having an inner periphery corresponding to the outer periphery of the upper and lower punch, a molding cavity being defined between the upper and lower punch, the core pin and the matrix, whereby the core pin is movable in relation to the matrix. According to the invention the upper pressing punch is arranged to actuate movement of the core pin or the matrix during compacting of a powder in the molding cavity so that the pressing punch and the core pin or the matrix move together.

Description

    FILED OF THE INVENTION
  • The present invention relates to a device for forming tubular articles from powder material. More particularly, the present invention is directed to a device comprising an upper pressing punch, a lower punch, a core pin and a matrix having an inner periphery corresponding to the outer periphery of the upper and lower punch, a molding cavity being defined between the upper and lower punch, the core pin and the matrix, whereby the core pin is movable in relation to the matrix. [0001]
    • BACKGROUND OF THE INVENTION
  • A problem encountered when making tubular articles, such as bearing rings, by compacting powdered metal located in a mold cavity having a stationary bottom wall and stationary side walls is uneven compacting of the articles, especially if the height of the tubular article is large in comparison with the wall thickness. This is due to friction between the particles in the metal powder and the walls of the molding cavity during the compacting step so that a large part of the compacting energy is consumed as frictional heat, the result being that the compacted tubular article is more compacted in the parts lying nearest the pressing punch than in other parts. [0002]
  • EP-A1-0 450 784 discloses a device for forming cylindrical compacts. In this device all the components except the lower punch is moved with different travelling speeds during the compacting step, which leads to a complicated and expensive construction of the device. [0003]
    • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a device in which the compacting of the tubular articles is more even than in a device having a mold cavity with a stationary bottom wall and stationary side walls, and which device is of a simple construction. [0004]
  • According to one aspect, the present invention provides a device for forming tubular articles from powder material comprising an upper pressing punch, a lower punch, a core pin and a matrix having an inner periphery corresponding to an outer periphery of the upper and lower punch, a molding cavity being defined between the upper and lower punch, the core pin and the matrix, whereby the core pin is movable in relation to the matrix, wherein the upper pressing punch is arranged to actuate movement of the core pin or the matrix during compacting of a powder in the molding cavity so that the pressing punch and the core pin or the matrix move together. [0005]
  • In a preferred embodiment, the core pin is movable between a first position in which the upper end thereof is located in line with, or above, the upper wall of the matrix, and a second position in which the upper wall of the core pin is located below the upper wall of the matrix. The core pin can advantageously be biased against the first position. Furthermore, the upper pressing punch has in a first position a part of its lower wall in contact with the upper end wall of the core pin, so that the pressing punch will force the core pin to follow downwards movement thereof from its first position, and the upper pressing punch is preferably moveable upwards from its first position in order to open up the molding cavity for insertion of powder materials. The lower punch can advantageously be upwardly moveable in order to eject a compacted article from the molding cavity. [0006]
  • In another embodiment the core pin is an integral part of the upper pressing punch. [0007]
  • It is pointed out that the term “tubular articles” includes articles having various sectional shapes such as polygonal (e.g. - rectangular), circular, etc. The sectional shape can also be an open tubular shape (i.e. - with other shapes than circular), for example a U-shaped section.[0008]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will now be further described with reference to the enclosed Figures, of which; [0009]
  • FIG. 1 is a schematic sectional view of a device according to a preferred embodiment of the invention, showing the device immediately before the pressing step, and [0010]
  • FIG. 2 is a view similar to FIG. 1, showing the device in the end of the pressing step.[0011]
    • DESCRIPTION OF EMBODIMENTS
  • The device in FIGS. 1 and 2 comprises a [0012] cylindrical core pin 1 and an annular matrix 2, which has an inner diameter that is larger than the diameter of the core pin 1 so that a cylindrical space is defined between the core pin and the matrix. A lower punch 3 having the form of a hollow cylinder is dimensioned to fit into the annular space between the core pin and the matrix and the upper wall of the lower punch 3 constitutes the bottom wall of a molding cavity 4. A work piece 5 of powder metal is disposed in this cavity in FIG. 1.
  • A [0013] pressing punch 6 having a cylindrical body with a diameter corresponding to the inner diameter of the matrix 2 is slidable within the inner cylindrical space defined by the matrix. The lower end surface 7 of the pressing punch has a central recess into which the upper end portion 8 of the core pin 1 is fitted.
  • According to the invention the [0014] core pin 1 is slidable within the lower punch 3 and is biased to a first position by a spring 9 disposed between the lower end surface of the core pin and an opening in the foundation. In the first position of the core pin its upper end surface is flush with the upper surface of the matrix 2 in order to facilitate removal of superfluous powder filled into the molding cavity. In FIG. 1, the core pin is disposed in its first position.
  • In FIG. 1 the [0015] pressing punch 6 is placed in a first position from which the step of compacting the work piece 5 takes place by pressing the punch 6 downwardly with a pressing force P. In the first position of the pressing punch, the surface of the central recess in its lower end surface 7 abuts the surface of the upper end portion 8 of the core pin and the side wall of the upper end portion 8 abuts the vertical wall of the recess in the lower end surface 7 of the pressing punch. The core pin is thus forced to follow downward movement of the pressing punch from its first position.
  • During the pressing step the pressing punch and the core pin will thus move together. Thereby, the friction forces created between the moving wall of the core pin and the particles in the [0016] powder material 5 disposed in the molding cavity 4 will have an opposite direction relative to the frictional forces created between the particles in the powder material and the stationary matrix wall. The friction forces created during the pressing step will thus balance each other and the powder material will be more evenly compacted throughout the height thereof.
  • In FIG. 2 the inventive device is shown in the end of the pressing step. The powder material in the molding cavity being compacted to an [0017] annular ring 10. The lower punch 3 is by some suitable means arranged to act as a knock-out punch after the pressure P on the pressing punch 6 has been released, so as to eject the finished ring 10 from the molding cavity. For example, hydraulic pistons disposed in the foundation under the lower punch 3 can be arranged push the lower punch 3 upwardly when actuated. Before the ring 10 is ejected the upper pressing punch 6 is moved upwards to a position above the position shown in FIG. 1 in order to facilitate removal of the ring 10 from the molding cavity 4.
  • It is not unusual that the device is used also for compacting powder material in the form of preshaped tubular articles or green bodies. The devices should therefore preferably be designed to facilitate insertion of such preformed articles into the molding cavity. [0018]
  • The described embodiment can of course be modified in several respects while remaining within the scope of the invention. For example, the pressing punch and the core pin can form an integral piece. However, such a structure makes the use of the device for preparatory or green compacts complicated and is therefore not preferred. Moreover, the pressing punch can have a totally flat lower end surface instead of the recess disclosed in the described embodiment. However, this is not preferred since the guiding of the core pin will then be decreased. Furthermore, the matrix can be arranged to move together with the pressing punch during the pressing step instead of the core pin, which in such an embodiment is stationary. The scope of invention should therefore be limited only of the wording of the enclosed patent claims. [0019]
  • While the present invention has been described by reference to the above-mentioned embodiments, certain modifications and variations will be evident to those of ordinary skill in the art. Therefore the present invention is to be limited only by the scope and spirit of the appended claims. [0020]

Claims (6)

What is claimed is:
1. A device for forming tubular articles from powder material comprising an upper pressing punch, a lower punch, a core pin and a matrix having an inner periphery corresponding to an outer periphery of the upper and lower punch, a molding cavity being defined between the upper and lower punch, the core pin and the matrix, whereby the core pin is movable in relation to the matrix, wherein the upper pressing punch is arranged to actuate movement of the core pin or the matrix during compacting of a powder in the molding cavity so that the pressing punch and the core pin or the matrix move together.
2. The device according to claim 1, wherein the core pin is an integral part of the upper pressing punch.
3. The device according to claim 1, wherein the core pin is movable between a first position in which the upper end thereof is located in line with or above the upper wall of the matrix and a second position in which the upper wall of the core pin is located below the upper wall of the matrix.
4. The device according to claim 3, wherein the core pin is biased against the first position.
5. The device according to claim 3, wherein the upper pressing punch in the first position has a part of its lower wall in contact with the upper end wall of the core pin so that the pressing punch will force the core pin to follow downwards movement thereof from its first position, and that the upper pressing punch is moveable upwards from its first position in order to open the molding cavity (4) for insertion of powder material.
6. The device according to claim 1, wherein the lower punch is upwardly moveable in order to eject a compacted article from the molding cavity.
US09/839,154 2000-04-27 2001-04-23 Device for forming annular articles from powder material Abandoned US20020022063A1 (en)

Applications Claiming Priority (2)

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SE0001523-0 2000-04-27
SE0001523A SE0001523D0 (en) 2000-04-27 2000-04-27 A device for forming annular articles from powder material

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JP (1) JP2002001595A (en)
KR (1) KR20010098917A (en)
CN (1) CN1320519A (en)
BR (1) BR0101598A (en)
CA (1) CA2344018A1 (en)
SE (1) SE0001523D0 (en)

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WO2009062592A2 (en) * 2007-11-13 2009-05-22 Ixetic Hückeswagen Gmbh Sintered rotor
US20120107444A1 (en) * 2010-10-29 2012-05-03 Hitachi Powdered Metals Co., Ltd. Forming die assembly for microcomponents
US20120107445A1 (en) * 2010-10-29 2012-05-03 Hitachi Powdered Metals Co., Ltd. Forming die assembly for microcomponents
CN103240904A (en) * 2013-05-23 2013-08-14 郑州磐石新材料科技有限公司 Split-type die
CN104827032A (en) * 2015-04-28 2015-08-12 成都易态科技有限公司 Honeycomb-shaped metal filter core forming method and mold

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US6899846B2 (en) * 2003-01-14 2005-05-31 Sinterstahl Corp.-Powertrain Method of producing surface densified metal articles
JP4490241B2 (en) * 2004-11-22 2010-06-23 三菱マテリアルテクノ株式会社 Powder molding equipment
US7959837B2 (en) * 2009-04-01 2011-06-14 The Gillette Company Method of compacting material
CN101518812B (en) * 2009-04-07 2011-01-26 贵阳高新金睿通纳科技有限公司 Dry press forming method of nano-micron composite material tubular member and dry press forming device of nano-micron composite material tubular member
CN102225467B (en) * 2011-05-20 2013-04-03 西北工业大学 Powder material forming pipe fitting forming mold and method
CN103072283B (en) * 2012-12-30 2015-03-11 南京肯特复合材料有限公司 Production method for annular magnet embedded hollow PTFE part
CN103624254B (en) * 2013-11-01 2015-09-16 横店集团东磁股份有限公司 A kind of thin wall powder metallurgy forming mould and forming method
CN104290229B (en) * 2014-06-24 2016-10-26 南通市日盛园林工具配件厂 Ultra-high molecular weight polyethylene filter element two-way compacting sintering forming die and forming method thereof
CN104553002B (en) * 2014-12-29 2017-01-18 东莞市科雷明斯智能科技有限公司 Method for automatically forming polytetrafluoroethylene tube and equipment
CN104942285B (en) * 2015-06-30 2017-09-26 成都易态科技有限公司 The forming method and mould of compound filter core between honeycomb metal
CN106976192B (en) * 2017-03-21 2023-04-18 江苏肯帝亚木业有限公司 Wood fiber thermal modification wood-plastic composite material equipment and preparation process of wood-plastic composite material
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009062592A2 (en) * 2007-11-13 2009-05-22 Ixetic Hückeswagen Gmbh Sintered rotor
WO2009062592A3 (en) * 2007-11-13 2009-08-20 Ixetic Hueckeswagen Gmbh Sintered rotor
US20120107444A1 (en) * 2010-10-29 2012-05-03 Hitachi Powdered Metals Co., Ltd. Forming die assembly for microcomponents
US20120107445A1 (en) * 2010-10-29 2012-05-03 Hitachi Powdered Metals Co., Ltd. Forming die assembly for microcomponents
US8850494B2 (en) * 2010-10-29 2014-09-30 Hitachi Powdered Metals Co., Ltd Forming die assembly for microcomponents
US8851872B2 (en) * 2010-10-29 2014-10-07 Hitachi Powdered Metals Co., Ltd. Forming die assembly for microcomponents
CN103240904A (en) * 2013-05-23 2013-08-14 郑州磐石新材料科技有限公司 Split-type die
CN104827032A (en) * 2015-04-28 2015-08-12 成都易态科技有限公司 Honeycomb-shaped metal filter core forming method and mold

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CA2344018A1 (en) 2001-10-27
CN1320519A (en) 2001-11-07
JP2002001595A (en) 2002-01-08
BR0101598A (en) 2001-12-04
KR20010098917A (en) 2001-11-08
SE0001523D0 (en) 2000-04-27

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Effective date: 20010612

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