EP0141349B1 - Vefahren zur pulvermetallurgischen Herstellung von Rohren sowie danach hergestellte Rohrrohlinge (Halbfabrikate) - Google Patents

Vefahren zur pulvermetallurgischen Herstellung von Rohren sowie danach hergestellte Rohrrohlinge (Halbfabrikate) Download PDF

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Publication number
EP0141349B1
EP0141349B1 EP84112604A EP84112604A EP0141349B1 EP 0141349 B1 EP0141349 B1 EP 0141349B1 EP 84112604 A EP84112604 A EP 84112604A EP 84112604 A EP84112604 A EP 84112604A EP 0141349 B1 EP0141349 B1 EP 0141349B1
Authority
EP
European Patent Office
Prior art keywords
tube
bulge
inner tube
powder
tube surface
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
EP84112604A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0141349A1 (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 EP0141349A1 publication Critical patent/EP0141349A1/de
Application granted granted Critical
Publication of EP0141349B1 publication Critical patent/EP0141349B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power
    • 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
    • B22F3/1258—Container manufacturing
    • 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
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding

Definitions

  • the invention relates to a method for the powder-metallurgical production of pipes, in which powders of metal and / or metal alloys are filled into a thin-walled capsule consisting of an inner tube jacket and an outer tube jacket and a base, the capsule then on its side opposite the base with an annular cover sealed and exposed to a cold isostatic pressure, whereby the powder is compressed or compressed within the capsule, so that a solid or dimensionally stable tube blank is formed, which is then extruded under heat.
  • the object of the present invention is to avoid such a crack formation when the tube blank is heated to the hot working temperature.
  • the bulge according to the invention can compensate or neutralize thermal stresses, the bulge or bulges being formed at the locations of maximum thermal stresses, that is to say preferably at the end regions of the inner tube or inner tube jacket.
  • the bulges preferably extend radially outward and are formed by means of rollers or rollers or the like, it being possible for both male and female dies to be used.
  • the bulges have a “soft or flat” shape, particularly in the area of the transitions from the bulge to the inner tube or inner tube jacket.
  • the cross section of the bulge is thus approximately trough-shaped, the transition radii being approximately in the order of magnitude of the radius of the inner tube jacket. The formation of wrinkles must be avoided in any case.
  • the bulges allow the inner tube or inner tube shell to be easily stretched or stretched when the tube blank or compact is heated to the hot working temperature, so that the inner tube shell is smoothed.
  • a preferred embodiment of a tube blank or compact formed and used according to the invention is briefly explained below with reference to the attached drawing. This shows a cross section of a pipe blank or compact before hot machining. Mean
  • a radially outwardly extending bulge 15, 16 is formed, which allows thermal expansion of the inner tube when the tubular capsule 10 is heated to the hot working temperature, in such a way that the inner tube is smoothed jacket 12 takes place.
  • two or more bulges corresponding to the bulges 15, 16 extending over the circumference of the inner tube or inner tube shell 12 can be arranged at the front ends.
  • the bulges 15, 16 are relatively flat in cross section, ie the transition radii are relatively large and move in the order of magnitude of the radius of the inner tube shell 12.
  • the pipe blank or compact 10 heated to the hot working temperature with the smoothed inner pipe jacket 12 can then be pressed in a conventional manner to the final pipe string.
  • the depth and the transition radii r i , r 2 and r 3 depend both on the dimension of the tube blank or compact 10, the powder material used, the material of the inner tube jacket 12 and outer tube jacket 11 and the hot working temperature.
  • the base radius r 2 is preferably approximately twice as large as the transition radii r, and r 2 in the transition region between the bulge and the inner tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Powder Metallurgy (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Drilling And Boring (AREA)
EP84112604A 1983-10-21 1984-10-18 Vefahren zur pulvermetallurgischen Herstellung von Rohren sowie danach hergestellte Rohrrohlinge (Halbfabrikate) Expired EP0141349B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3338367 1983-10-21
DE3338367A DE3338367C1 (de) 1983-10-21 1983-10-21 Verfahren zur pulvermetallurgischen Herstellung von Rohren sowie danach hergestellte Rohrbolzen(Halbfabrikate)

Publications (2)

Publication Number Publication Date
EP0141349A1 EP0141349A1 (de) 1985-05-15
EP0141349B1 true EP0141349B1 (de) 1987-10-07

Family

ID=6212471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112604A Expired EP0141349B1 (de) 1983-10-21 1984-10-18 Vefahren zur pulvermetallurgischen Herstellung von Rohren sowie danach hergestellte Rohrrohlinge (Halbfabrikate)

Country Status (7)

Country Link
EP (1) EP0141349B1 (ja)
JP (1) JPS60169504A (ja)
KR (2) KR890004603B1 (ja)
BR (1) BR8405321A (ja)
CA (1) CA1228707A (ja)
DE (2) DE3338367C1 (ja)
ES (1) ES8600986A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520910A1 (de) 1985-06-11 1986-12-11 Avesta Nyby Powder AB, Torshälla Verfahren zur herstellung von strangpressbolzen, zur pulvermetallurgischen erzeugung von rohren
FI100422B (fi) * 1994-07-11 1997-11-28 Metso Paper Inc Telan valmistus
JP6303521B2 (ja) * 2014-01-17 2018-04-04 株式会社ダイヤメット 回転体、回転体素材、及び回転体の製造方法
KR102251808B1 (ko) * 2018-08-17 2021-05-20 박성일 트리거식 핸드피스

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3009916C2 (de) * 1980-03-14 1985-10-10 Nyby Uddeholm AB, Torshälla Strangpreßbolzen für die pulvermetallurgische Herstellung von Rohren sowie Verfahren zu seiner Herstellung
FR2492291A1 (fr) * 1980-10-22 1982-04-23 Uk I Sp Conteneur pour l'extrudage a chaud de poudres metalliques

Also Published As

Publication number Publication date
DE3466656D1 (en) 1987-11-12
ES536956A0 (es) 1985-11-01
JPH0515763B2 (ja) 1993-03-02
KR890004603B1 (ko) 1989-11-20
KR850004036A (ko) 1985-07-01
BR8405321A (pt) 1985-09-03
DE3338367C1 (de) 1985-09-26
ES8600986A1 (es) 1985-11-01
KR890004604B1 (ko) 1989-11-20
EP0141349A1 (de) 1985-05-15
KR890003494A (ko) 1989-04-15
CA1228707A (en) 1987-11-03
JPS60169504A (ja) 1985-09-03

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