KR20010098917A - A device for forming annular articles from powder material - Google Patents

A device for forming annular articles from powder material Download PDF

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Publication number
KR20010098917A
KR20010098917A KR1020010022815A KR20010022815A KR20010098917A KR 20010098917 A KR20010098917 A KR 20010098917A KR 1020010022815 A KR1020010022815 A KR 1020010022815A KR 20010022815 A KR20010022815 A KR 20010022815A KR 20010098917 A KR20010098917 A KR 20010098917A
Authority
KR
South Korea
Prior art keywords
core pin
mold
upper
punch
casting cavity
Prior art date
Application number
KR1020010022815A
Other languages
Korean (ko)
Inventor
괴란손 보
Original Assignee
추후제출
에스케이에프 노바 에이비
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
Priority to SE0001523-0 priority Critical
Priority to SE0001523A priority patent/SE0001523D0/en
Application filed by 추후제출, 에스케이에프 노바 에이비 filed Critical 추후제출
Publication of KR20010098917A publication Critical patent/KR20010098917A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10Manufacture 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
    • B22F5/106Tube or ring forms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • B22F3/03Press-moulding apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10Manufacture 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B11/00Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02Presses 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F2998/00Supplementary information concerning processes or compositions relating to powder metallurgy

Abstract

The present invention is the upper and lower punch, the upper and lower punches, the casting cavity (4), the core pin and the upper press punch (6), the lower punch (3), the core pin having an inner circumference coinciding with the outer circumference A device for forming an annular item 10 from a powder material 5 comprising (1) and a mold (2). Accordingly, the core pin can move relative to the mold.
According to the present invention, the upper pressing punch 6 is arranged to perform the movement of the core pin 1 or the mold 2 during the compression of the powder 5 in the casting cavity 4 so that the pressure punch and the core pin or the mold move together. do.

Description

A device for forming annular articles from powder material

The present invention relates to an annular form of a powder material comprising an upper and lower punch, a casting cavity defined between the upper and lower punches, an upper press punch, a lower punch core pin and a mold having an inner circumference in which the core pin and the mold coincide with the outer circumference. It relates to an apparatus for forming an item. Accordingly, the core pin can move relative to the mold.

The problem encountered when manufacturing tubular items such as support rings by compressing powder metal located in a casting cavity having a fixed bottom wall and a fixed side is particularly uncompressed when the tubular items are larger than the wall thickness. It is.

This is due to the frictional heat between the particles in the metal powder and the walls of the casting cavity during the compression phase, where most of the compression energy is consumed by the frictional heat. This allows the compressed tubular item to be more compressed near the pressure punch than in other parts.

EP-A1-0 450 784 describes an apparatus for forming a cylindrical compression according to the front end of claim 1. In the apparatus, all elements except the lower punch are moved at different speeds during the compression process, making the construction of the apparatus complicated and expensive.

It is an object of the present invention to achieve an apparatus having a simpler structure and that the compression of tubular articles is made flatter than in an apparatus having a cast cavity with a fixed bottom wall and a fixed side wall.

An object of the present invention includes a casting cavity, a core pin and a mold defined between an upper press punch, a lower punch, a core pin and a mold having an inner circumference coinciding with the outer circumference of the upper and lower punches, the core pin and the mold, and accordingly the core The pin is an apparatus for forming a tubular item from a powdered metal that is movable relative to the mold.

An upper press pin is arranged so that the movement of the core pin or the mold is carried out while compressing the powder in the casting cavity such that the press punch and the core pin or the mold move together.

In this arrangement, the frictional forces between the particles in the metal powder and the wall of the core pin and the mold are balanced with each other during the pressing step so that the tubular material in the casting cavity is compressed more evenly through the height.

1 is a schematic cross-sectional view of a device according to a preferred embodiment of the present invention showing the device prior to the pressing process.

FIG. 2 is a view similar to FIG. 1 showing the apparatus at the end of the pressing process.

* Code Description

1: core pin 2: mold

3: lower punch 4: casting cavity

5: material 6: press punch

7: Lower end surface 8: Upper end surface

9: spring 10: ring

In a preferred embodiment, the core pin can move between a first position where the upper end is in the line or on the top wall of the mold and a second position where the top wall of the core pin is below the top wall of the mold. The core pin has the advantage of being biased against the first top wall of the mold.

In addition, the upper press punch has a portion of the lower wall in contact with the upper end wall of the core pin to force the core pin in the first position to follow the downward motion from the first position, the upper press punch having a powder material It is desirable to be able to move upward from the first position to open the casting cavity to insert the.

The lower punch has the advantage of being able to move upwards in order to release the compressed item from the casting cavity.

In a second embodiment, the core pin is an integral part of the upper pressure punch.

The term "tubular item" mentioned above includes an item having a section in which a tubular item is formed having a shape different from that of the annular shape, that is, a rectangular and open tubular shape, for example a U-shape.

The device of FIGS. 1 and 2 comprises an annular mold 2 having an inner diameter larger than the diameter of the core pin 1 such that the cylindrical core pin 1 and the cylindrical space are defined between the core pin and the mold. do. The lower punch 3 in which the hollow cylinder is formed is sized to fit the annular space between the core pin and the mold, and the upper wall of the lower punch 3 constitutes the bottom wall of the casting cavity 4. The raw material 5 of powder metal is arranged in the cavity of FIG.

The press punch 6 having a cylindrical body formed with a diameter corresponding to the inner diameter of the mold 2 is slidable in an inner cylindrical space defined by the mold.

The lower end surface 7 of the pressing punch has a center recess into which the upper end portion 8 of the core pin 1 is fitted.

According to the invention, the core pin is deflected into the first position by a spring 9 which is slidable in the lower punch 3 and arranged between the lower end surface of the core pin and the opening of the foundation. In the first position, the core pin is ejected to the upper surface of the mold 2 to facilitate the removal of excess powder filled with the casting cavity. In FIG. 1 the core pin is disposed in a first position.

In Fig. 1, the pressure punch 6 is disposed in a first position where the step of compressing the raw material 5 occurs by pressing the punch 6 downward with the pressing force P.

In the first position of the pressing punch, the surface of the center recess in the lower end surface 7 is adjacent to the surface of the upper end portion 8 of the core pin and the side wall of the upper end portion 8 is the lower end surface of the pressing punch. It is adjacent to the vertical wall of the groove in (7). Thus, the core pin follows the downward movement of the pressure punch from the first position. Thus, the pressing punch and core pin move together during the pressing process. Accordingly, the frictional force formed between the movable wall of the core pin and the particles in the powder material 5 disposed in the casting cavity 4 has a direction opposite to the friction force formed between the particles in the powder material and the fixed mold wall. Thus, the frictional forces formed during the pressing process balance each other and the powder material is compressed more evenly through the height.

In Fig. 2 the device of the present invention is shown at the end of the pressing process, in which the powder material in the casting cavity is compressed into an annular ring 10.

The lower punch 3 is arranged to act as a knock-out punch by appropriate means so that the ring 10 closed from the casting cavity is discharged after the pressure P on the pressure punch 6 is released.

For example, the hydraulic piston disposed in the foundation under the lower base 3 may be arranged to press the lower punch disposed upward when acting. Before the ring 10 is discharged, the upper pressing punch 6 moves downward to a position above the position shown in FIG. 1 to facilitate removal of the ring 10 from the casting cavity 4.

It is common for the device to be used to compress the powder material in the form of a preformed optical item or green body as well, and the device is therefore preferably designed to facilitate the insertion of the preformed item into a casting cavity. .

The above-described embodiments may be changed in some respects without departing from the scope of the present invention. For example, the pressure punch and the core pin may be integrally formed. However, this structure leads to the use of a reserve device or the use of complex green compression and is therefore undesirable.

The press punch also has a lower end surface that is generally flat in place of the recesses disclosed in the above embodiments. However, this is not desirable because the core pin is not guided. The mold may also be arranged to move with the pressing punch during the pressing process instead of the core pin fixed in the embodiment. Accordingly, the scope of the invention should be limited only by the description of the appended claims.

Claims (6)

  1. Upper press punch 6, lower punch 3, core pin 1 and mold 2 having an inner circumference corresponding to the outer circumference of the upper and lower punches, a casting cavity 4 defined between the upper and lower punches, In an apparatus comprising a core pin and a mold (2), whereby the core pin forms a tubular item (10) from powder material (5) that is movable relative to the mold.
    Characterized in that the upper pressing pin is arranged so that the movement of the core pin 1 or the mold 2 is executed while compressing the powder 5 in the casting cavity 4 so that the pressing punch and the core pin or the mold move together. Device.
  2. 2. The apparatus of claim 1, wherein the core pin is an integral part of the upper pressure punch.
  3. 2. A first position according to claim 1, wherein said core pin (1) is positioned in a line at an upper end thereof or on an upper wall of the mold (2) and the upper wall of said core pin is located under an upper wall of the mold (2). And moveable between the second positions.
  4. 4. Device according to claim 3, characterized in that the core pin (1) is deflected with respect to the first position.
  5. 5. The upper press punch (6) according to claim 3 or 4, wherein the upper press punch (6) contacts the upper end wall of the core pin to force the core pin (1) in the first position such that the press punch follows the downward motion from the first position. And a portion of the lower wall, said upper press punch being movable upwardly from the first position to open the casting cavity (4) to insert powder material.
  6. Device according to one of the preceding claims, characterized in that the lower punch (3) is movable upward to discharge the compressed item (10) from the casting cavity (4).
KR1020010022815A 2000-04-27 2001-04-27 A device for forming annular articles from powder material KR20010098917A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE0001523-0 2000-04-27
SE0001523A SE0001523D0 (en) 2000-04-27 2000-04-27 A device for forming Annular articles from powder materials

Publications (1)

Publication Number Publication Date
KR20010098917A true KR20010098917A (en) 2001-11-08

Family

ID=20279434

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020010022815A KR20010098917A (en) 2000-04-27 2001-04-27 A device for forming annular articles from powder material

Country Status (7)

Country Link
US (1) US20020022063A1 (en)
JP (1) JP2002001595A (en)
KR (1) KR20010098917A (en)
CN (1) CN1320519A (en)
BR (1) BR0101598A (en)
CA (1) CA2344018A1 (en)
SE (1) SE0001523D0 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE112008003014A5 (en) * 2007-11-13 2010-09-16 Ixetic Hückeswagen Gmbh sintered rotor
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
JP5548588B2 (en) * 2010-10-29 2014-07-16 日立粉末冶金株式会社 Molding device for micro parts
JP5548587B2 (en) * 2010-10-29 2014-07-16 日立粉末冶金株式会社 Molding device for micro parts
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
CN103240904A (en) * 2013-05-23 2013-08-14 郑州磐石新材料科技有限公司 Split-type die
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
CN104827032B (en) * 2015-04-28 2017-03-08 成都易态科技有限公司 The forming method of honeycomb metal filter core and mould
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

Also Published As

Publication number Publication date
US20020022063A1 (en) 2002-02-21
CN1320519A (en) 2001-11-07
SE0001523D0 (en) 2000-04-27
CA2344018A1 (en) 2001-10-27
JP2002001595A (en) 2002-01-08
BR0101598A (en) 2001-12-04

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