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EP0150265A3 - A method for improving the properties of an elongate structural member - Google Patents

A method for improving the properties of an elongate structural member Download PDF

Info

Publication number
EP0150265A3
EP0150265A3 EP84111175A EP84111175A EP0150265A3 EP 0150265 A3 EP0150265 A3 EP 0150265A3 EP 84111175 A EP84111175 A EP 84111175A EP 84111175 A EP84111175 A EP 84111175A EP 0150265 A3 EP0150265 A3 EP 0150265A3
Authority
EP
European Patent Office
Prior art keywords
longitudinally
load
ultimate
compressive
com
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Withdrawn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
EP84111175A
Other languages
German (de)
French (fr)
Other versions
EP0150265A2 (en
Inventor
Laszlo Javorik
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.)
Grotnes Metalforming Systems Inc
Original Assignee
Grotnes Metalforming Systems Inc
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 Grotnes Metalforming Systems Inc filed Critical Grotnes Metalforming Systems Inc
Publication of EP0150265A2 publication Critical patent/EP0150265A2/en
Publication of EP0150265A3 publication Critical patent/EP0150265A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The longitudinally compressive and tensile propor­ tionality limits and ultimate strengths of an elongated struc­ tural member are increased by applying to the member a longitudinally compressive load which is close to its maxi­ mum load. In order to prevent buckling of the member under such a load, the member is confined in an encasement which allows the member to yield longitudinally without bending. By applying to the member a longitudinally com­ pressive load much greater than the member's original (i.e. untreated) ultimate compressive strength, both the ultimate strengths and the proportionality limits of the member are increased. In addition, application of a longitudinally com­ pressive load close to or greater than the original ultimate compressive strength of the member also increases the straightness of the member and frees the member of re­ sidual stresses.
EP84111175A 1984-01-26 1984-09-19 A method for improving the properties of an elongate structural member Withdrawn EP0150265A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57428284A 1984-01-26 1984-01-26
US574282 1984-01-26

Publications (2)

Publication Number Publication Date
EP0150265A2 EP0150265A2 (en) 1985-08-07
EP0150265A3 true EP0150265A3 (en) 1985-11-06

Family

ID=24295452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111175A Withdrawn EP0150265A3 (en) 1984-01-26 1984-09-19 A method for improving the properties of an elongate structural member

Country Status (2)

Country Link
EP (1) EP0150265A3 (en)
JP (1) JPS60159118A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178141A (en) * 1937-07-29 1939-10-31 Nat Supply Co Method for straightening oil-well casings or the like
DE699336C (en) * 1937-01-05 1940-11-27 Hans Moechel Metal rods for components which must have increased buckling strength
AT188738B (en) * 1952-08-12 1957-02-11 Johannes Schwarz Process for work hardening unalloyed or alloyed steel bars, pipes or the like.
DE1508400A1 (en) * 1965-10-30 1969-10-23 Nippon Kokan Kk Process for improving the mechanical strength of metal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE699336C (en) * 1937-01-05 1940-11-27 Hans Moechel Metal rods for components which must have increased buckling strength
US2178141A (en) * 1937-07-29 1939-10-31 Nat Supply Co Method for straightening oil-well casings or the like
AT188738B (en) * 1952-08-12 1957-02-11 Johannes Schwarz Process for work hardening unalloyed or alloyed steel bars, pipes or the like.
DE1508400A1 (en) * 1965-10-30 1969-10-23 Nippon Kokan Kk Process for improving the mechanical strength of metal

Also Published As

Publication number Publication date
JPS60159118A (en) 1985-08-20
EP0150265A2 (en) 1985-08-07

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

PUAL Search report despatched

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AK Designated contracting states

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19860224

17Q First examination report despatched

Effective date: 19860731

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880126

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JAVORIK, LASZLO