EP0367358B1 - Verfahren zum Herstellen von Halbzeug - Google Patents

Verfahren zum Herstellen von Halbzeug Download PDF

Info

Publication number
EP0367358B1
EP0367358B1 EP89250048A EP89250048A EP0367358B1 EP 0367358 B1 EP0367358 B1 EP 0367358B1 EP 89250048 A EP89250048 A EP 89250048A EP 89250048 A EP89250048 A EP 89250048A EP 0367358 B1 EP0367358 B1 EP 0367358B1
Authority
EP
European Patent Office
Prior art keywords
block
cross
upsetting
length
starting
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 - Lifetime
Application number
EP89250048A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0367358A3 (de
EP0367358A2 (de
Inventor
Werner Dipl.-Ing. Fritsch
Wilhelm Dipl.-Ing. Nickel
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0367358A2 publication Critical patent/EP0367358A2/de
Publication of EP0367358A3 publication Critical patent/EP0367358A3/de
Application granted granted Critical
Publication of EP0367358B1 publication Critical patent/EP0367358B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting

Definitions

  • the invention relates to a method for producing semi-finished products according to the preamble of the main claim.
  • Semi-finished products with an appropriate cross-sectional format are required to manufacture seamless tubes with an outer diameter of more than 250 mm.
  • This semifinished product can be a continuous casting block which is cut off from an endless strand or a corresponding stationary casting block with a circular, square or polygonal cross section.
  • the economically producible cross sections that have become known so far are 435 mm in diameter for round casting and 560 mm width for an octagonal cross section.
  • the casting speed must be greatly reduced due to the susceptibility to surface cracking as a result of increasing peripheral stresses.
  • a greatly reduced pouring speed means emptying times for the pan, for which the maintenance of the liquid state is no longer guaranteed.
  • the object of the invention is to develop a method with which it is easy and economical to produce suitable semifinished products with a view to optimum forming for the production of hot-worked seamless tubes with an outer diameter of more than 250 mm.
  • a cross-sectionally cylindrical or regular prismatic output block made of continuously cast starting material is heated to a forming temperature corresponding to the material, e.g. B. heated in a deep-freeze or rotary hearth furnace and removed from the furnace after the drawing of the scale created by the heating process.
  • the drawing temperature is in a range from 1200 to 1300 degrees.
  • the descaled block is placed in a die and compressed in the longitudinal direction by means of a press ram.
  • the aim In order for the material to flow evenly on all sides, the aim must be that the axis of the pressure cone that forms ideally coincides with the longitudinal axis of the block. To achieve this, it is proposed to center the block in the die before the longitudinal compression begins.
  • the press ram and / or the die base has an adjustable recess, the circumference of which corresponds to the circumference of the starting block. In the first stage, the middle area is essentially compressed first and the recess is pressed in a second stage.
  • the initial cross-section F o is smaller than the cross section F 1 after upsetting and the length 1 1 of the compressed block is less than the length 1 o of the output block.
  • the diameter d o in the case of a polygonal cross section, for example corresponds to the circular cross section of the same area.
  • the lowest limit is considered to be a ratio of 3 and a ratio of 10 is sought.
  • the longitudinal compression takes place together with the subsequent punching and rolling in one heat.
  • a centering cone is compressed at the foot and / or head end during longitudinal compression.
  • the longitudinal compression itself can take place either only on the head side or only on the foot side, or at the same time on the head and foot side by means of press rams moving centrally towards one another.
  • Both the starting block and the compressed block can be up to 3% conical.
  • the advantage of the method according to the invention is that the positive properties of the continuous casting, such as uniform structure over the length of the strand, good degree of purity and a good surface can also be used for the production of semi-finished products with a larger cross-sectional format.
  • the effect is also exploited that the loosening zone typical of continuous casting is compressed in the middle by longitudinal compression and part of the unfavorable dendritic casting structure is converted. This leads to a considerable improvement, especially of the inner surface of the pipes that are subsequently hot-rolled.
  • the method opens up the possibility with z. B. only two standard dimensions as starting blocks to produce a large number of the required semi-finished product dimensions for the most varied tube dimensions.
  • the method can be used particularly advantageously on a round casting block, but it is also advantageous for a standing casting block with a round or polygonal cross section. In the case of water-capped blocks, the blow hole would weld during longitudinal compression.
  • the blocks can be compressed in a conventional press, so that no additional investment is required to implement the method.
  • the subsequent punching of the compressed block can take place in the same heat in the punch press using a combination punch that is suitable for upsetting and punching, or in the cross-rolling mill.
  • the further rolling of the hollow block to the finished tube is carried out in a corresponding rolling mill, for. B. Pilger Rolling Mill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Articles (AREA)
EP89250048A 1988-11-01 1989-10-02 Verfahren zum Herstellen von Halbzeug Expired - Lifetime EP0367358B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837399A DE3837399C1 (OSRAM) 1988-11-01 1988-11-01
DE3837399 1988-11-01

Publications (3)

Publication Number Publication Date
EP0367358A2 EP0367358A2 (de) 1990-05-09
EP0367358A3 EP0367358A3 (de) 1991-01-09
EP0367358B1 true EP0367358B1 (de) 1994-07-27

Family

ID=6366451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89250048A Expired - Lifetime EP0367358B1 (de) 1988-11-01 1989-10-02 Verfahren zum Herstellen von Halbzeug

Country Status (3)

Country Link
EP (1) EP0367358B1 (OSRAM)
DE (2) DE3837399C1 (OSRAM)
ES (1) ES2057096T3 (OSRAM)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1927413B1 (en) * 2006-12-01 2009-08-19 Topy Kogyo Kabushiki Kaisha Press forging method
MY207484A (en) * 2022-12-28 2025-02-28 Hartalega Res Sdn Bhd Permeation resistant glove

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1302427B (de) * 1963-07-04 1972-05-04 Calmes, Jean-Paul, Mont-sur-Lausanne (Schweiz) Verfahren zur Herstellung eines zylindrischen Hohlkörpers durch Preßlochwalzen
FR2220328A1 (OSRAM) * 1973-03-07 1974-10-04 Inst Obrobki Plastycznes

Also Published As

Publication number Publication date
EP0367358A3 (de) 1991-01-09
EP0367358A2 (de) 1990-05-09
DE3837399C1 (OSRAM) 1989-11-16
ES2057096T3 (es) 1994-10-16
DE58908102D1 (de) 1994-09-01

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