EP0141350B1 - Verfahren zur Herstellung pulvermetallurgischer Gegenstände - Google Patents

Verfahren zur Herstellung pulvermetallurgischer Gegenstände Download PDF

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Publication number
EP0141350B1
EP0141350B1 EP84112605A EP84112605A EP0141350B1 EP 0141350 B1 EP0141350 B1 EP 0141350B1 EP 84112605 A EP84112605 A EP 84112605A EP 84112605 A EP84112605 A EP 84112605A EP 0141350 B1 EP0141350 B1 EP 0141350B1
Authority
EP
European Patent Office
Prior art keywords
capsule
outer shell
approximately
circumferential surface
flexibly extensible
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.)
Expired
Application number
EP84112605A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0141350A1 (de
Inventor
Christer Aslund
Claes Tornberg
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.)
Nyby Uddeholm Powder AB
Original Assignee
Nyby Uddeholm Powder 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 Nyby Uddeholm Powder AB filed Critical Nyby Uddeholm Powder AB
Publication of EP0141350A1 publication Critical patent/EP0141350A1/de
Application granted granted Critical
Publication of EP0141350B1 publication Critical patent/EP0141350B1/de
Expired 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
    • 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
    • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
    • 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
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1216—Container composition
    • B22F3/1233—Organic material
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1216—Container composition
    • B22F3/1241—Container composition layered
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/031—Pressing powder with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y10T428/1359—Three or more layers [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section
    • Y10T428/2975—Tubular or cellular

Definitions

  • the invention relates to a process for the production of tubes in which the powder of metal and / or metal alloys is filled into a thin-walled capsule, the capsule is then closed and subjected to cold isostatic pressure, as a result of which the powder is compressed within the capsule to form a shape-retaining shape Pipe blanks, wherein the outer shell of the capsule has at least one approximately straight weld seam extending in the longitudinal direction of the pipe.
  • the weld seam extending in the longitudinal direction of the pipe represents an extremely critical area in the production of the pipe blank.
  • a longitudinal fold is formed which extends into the interior of the capsule.
  • the pipe blank must be discarded as a committee. The resulting losses in machine time and material are obvious.
  • US-A-2 932 882 discloses a method for coating a metal body with a. Layer of particularly corrosion-resistant material are removed, for this purpose the metal body, which can be made by powder metallurgy, is arranged within a deformable sleeve made of corrosion-resistant material and this arrangement is placed inside a container made of elastically stretchable material, in particular inside a rubber bag, and then exert pressure on the entire unit in the range of 1,000 to 60,000 psi. (6.9-413 N / mm2). This is intended to achieve a close connection between the metal body and the deformable sleeve made of corrosion-resistant material with corresponding deformation thereof. US-A-2 932 882 does not provide an indication of how to solve the above problem.
  • the outer shell of the capsule is provided with an elastically stretchable layer in such a way that an approximately uniform prestress is applied to the outer surface, the thickness of the elastically stretchable layer being approximately the same corresponds to one to two times the wall thickness of the capsule shell.
  • the method according to the invention for producing elongated tubes has proven to be particularly advantageous.
  • the measure according to the invention to provide the circumferential surface comprising the weld seam with an elastically stretchable layer of hard rubber or similar material in such a way that an approximately uniform prestress is applied to this surface, an approximately uniform pressure distribution is achieved over the entire circumference of the capsule shell. In this way, wrinkling along the weld seam when the cold isostatic pressure is applied is surprisingly avoided. It is.
  • an essential prerequisite for the function of the elastically stretchable layer is that it lies closely against the outer surface of the capsule shell and preferably exerts an approximately uniform surface pressure.
  • the elastically stretchable layer can be pulled or put over the outer surface of the capsule shell.
  • the elastically stretchable layer is fixed by means of hose clamps or adhesive strips in the area of the front ends of the capsule.
  • a particularly simple solution is the use of a sleeve made of elastically stretchable material, which has approximately the same length as the capsule and an inner diameter which is slightly less than the outer diameter of the capsule. This sleeve is pulled over the outer shell of the capsule before the cold isostatic pressure is applied. Due to the diameter ratio mentioned, a tight fit is guaranteed after being fitted onto the outer shell of the capsule. It is also ensured that the elastically stretchable layer formed in this way exerts an approximately uniform surface pressure on the lateral surface.
  • the front ends of the elastically stretchable and pressure-distributing layer are preferably designed to be somewhat thicker, in order in this way to compensate for the additional pressure on the capsule on the front side.
  • the tubular capsule 10 according to FIGS. 1 and 2 is filled with preferably spherical powder 13 made of metal and / or metal alloys and is closed on all sides.
  • the inner tubular jacket 11 is formed in one piece, while the outer tubular jacket 12 consists of a thin-walled sheet metal blank bent into a cylindrical sleeve, the abutting longitudinal edges of which are connected to one another by means of an approximately rectilinear weld seam 14 which extends in the longitudinal direction of the capsule.
  • the risk of wrinkles in the area of the weld seam 14 can be reliably avoided by the fact that the outer surface of the weld seam (outer tubular jacket 12) with an elastically stretchable layer 15, for. B. in the form of a sleeve made of elastically stretchable material, such as hard rubber, rubber, or the like, is surrounded ( Figures 3 and 4).
  • the sleeve 15 made of elastically stretchable material and drawn over the outer jacket 12 has a greater thickness in the region of the front ends of the capsule 10 than in the region in between. This compensates for the pressurization of the capsule 10 on the face side.
  • the inner diameter of the elastic, stretchable sleeve 15 is somewhat smaller than the outer diameter of the capsule 10 or the outer capsule shell 12, so that it is ensured that the sleeve 15 lies tightly or closely against the outer shell 12 of the capsule 10 and there is a somewhat uniform prestressing thereon exercises.
  • the sleeve 15 made of elastically stretchable material causes an approximately uniform pressure distribution when a cold isostatic pressure is applied, as a result of which the aforementioned wrinkling in the region of the longitudinal weld seam 14 is avoided. This fold is identified in FIG. 2 by reference number 16.
  • the sleeve 15 made of elastically stretchable material is fixed in the embodiment according to FIGS. 3 and 4 in the region of the front ends of the capsule 10 by means of hose bands 17 of a conventional type.
  • the elastically stretchable layer is also relatively thin-walled.
  • the wall thickness corresponds approximately to the wall thickness of the capsule skin.
  • the wall thickness of the elastically stretchable layer 15 is preferably approximately twice as large as the wall thickness of the capsule skin 11 or 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Powder Metallurgy (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP84112605A 1983-10-21 1984-10-18 Verfahren zur Herstellung pulvermetallurgischer Gegenstände Expired EP0141350B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3338369 1983-10-21
DE3338369A DE3338369C1 (de) 1983-10-21 1983-10-21 Verfahren zur Herstellung pulvermetallurgischer Gegenstaende

Publications (2)

Publication Number Publication Date
EP0141350A1 EP0141350A1 (de) 1985-05-15
EP0141350B1 true EP0141350B1 (de) 1988-09-07

Family

ID=6212473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112605A Expired EP0141350B1 (de) 1983-10-21 1984-10-18 Verfahren zur Herstellung pulvermetallurgischer Gegenstände

Country Status (5)

Country Link
US (1) US4565668A (enrdf_load_stackoverflow)
EP (1) EP0141350B1 (enrdf_load_stackoverflow)
JP (1) JPS60145303A (enrdf_load_stackoverflow)
KR (1) KR850004035A (enrdf_load_stackoverflow)
DE (2) DE3338369C1 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244623A (en) * 1991-05-10 1993-09-14 Ferro Corporation Method for isostatic pressing of formed powder, porous powder compact, and composite intermediates
AT411580B (de) * 2001-04-11 2004-03-25 Boehler Edelstahl Verfahren zur pulvermetallurgischen herstellung von gegenständen
KR100688748B1 (ko) * 2002-08-20 2007-03-02 마츠시타 덴끼 산교 가부시키가이샤 비트 축소 장치
JP2011503471A (ja) * 2007-11-07 2011-01-27 パーカー・ハニフィン・コーポレーション アルミニウム箔ホース
US9199308B2 (en) 2011-09-20 2015-12-01 GM Global Technology Operations LLC Method of producing composite articles and articles made thereby
CN109014219A (zh) * 2018-09-14 2018-12-18 河南德源净化装备有限公司 一种外表面光滑型粉末烧结过滤管的生产方法
CN109365824B (zh) * 2018-10-25 2021-06-25 西安石油大学 一种6.5wt％高硅电工钢薄壁空心管材的制备方法
CN115740448A (zh) * 2022-12-02 2023-03-07 同创(丽水)特种材料有限公司 一种金属棒材的冷等静压制备方法
CN117947386B (zh) * 2024-03-26 2024-06-25 成都晨发泰达航空科技股份有限公司 高致密度eb-pvd金属涂层及其制备方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1081618A (en) * 1912-03-28 1913-12-16 Westinghouse Lamp Co Process of preparing billets of refractory materials.
US2932882A (en) * 1954-02-25 1960-04-19 Jr John C R Kelly Method of preparing powdered refractory metals for mechanical working
FR1282645A (fr) * 1960-12-13 1962-01-27 Commissariat Energie Atomique Perfectionnements apportés aux procédés pour l'agglomération de poudres, notamment métalliques, en particulier d'uranium
US3551946A (en) * 1968-08-26 1971-01-05 Wah Chang Albany Corp Method and apparatus for compacting isostatically metal particles into solid form
US3862286A (en) * 1972-10-10 1975-01-21 Aluminum Co Of America Method of fabricating compacted powdered metal extrusion billets
US3780418A (en) * 1972-10-10 1973-12-25 Aluminum Co Of America Method of fabricating composite multi-metallic billets useful for metal working operations
US3892030A (en) * 1974-04-29 1975-07-01 Us Air Force Method of fabricating a billet from metal preforms and metal powder
US4000235A (en) * 1975-05-13 1976-12-28 National Forge Company Method for molding particulate material into rods
US4077109A (en) * 1976-05-10 1978-03-07 The International Nickel Company, Inc. Hot working of metal powders

Also Published As

Publication number Publication date
US4565668A (en) 1986-01-21
EP0141350A1 (de) 1985-05-15
JPS60145303A (ja) 1985-07-31
KR850004035A (ko) 1985-07-01
DE3473840D1 (en) 1988-10-13
JPS6340843B2 (enrdf_load_stackoverflow) 1988-08-12
DE3338369C1 (de) 1985-09-26

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