DE3209993C1 - Process for improvement of the further deformability of work-hardened metallic workpieces - Google Patents

Process for improvement of the further deformability of work-hardened metallic workpieces

Info

Publication number
DE3209993C1
DE3209993C1 DE19823209993 DE3209993A DE3209993C1 DE 3209993 C1 DE3209993 C1 DE 3209993C1 DE 19823209993 DE19823209993 DE 19823209993 DE 3209993 A DE3209993 A DE 3209993A DE 3209993 C1 DE3209993 C1 DE 3209993C1
Authority
DE
Germany
Prior art keywords
bending
pipes
deflection
followed
annealing
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
DE19823209993
Other languages
German (de)
Inventor
Gustav 5674 Hellenthal Godau
Hans-Erich 5372 Schleiden-Gemünd Schlömer
Alfred 5374 Hellenthal Schmitz
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
Priority to DE19823209993 priority Critical patent/DE3209993C1/en
Application granted granted Critical
Publication of DE3209993C1 publication Critical patent/DE3209993C1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C19/00—Devices for straightening wire or like work combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • 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
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • 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
    • 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
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars

Abstract

The invention relates to a process for improvement of the further deformability of work-hardened metallic workpieces, particularly for austenitic workpieces such as 18/8 chromium-nickel steels and nickel-based alloys. It is proposed, to avoid an intermediate annealing and to improve the surface quality, that the work-hardened workpiece be subjected to a flexing process under rotation (rotating bending) before the further deformation.

Description

Patentansprüche: 1. Verfahren zur Verbesserung der Weiterverformbarkeit ,von 'kaltverfestigten metallischen Werkstücken, insbesondere aus austenitischen Werkstoffen wie 18/8 Chrom-Nickel-Stählen und Nickelbasislegierungen, d a d u r c h g e k e n n -z e i c h n e t, daß das kaltverfestigte Werkstück vor der Weiterverformung einem Walkvorgang unter Rotation (rotierenden Biegen) unterworfen wird. Claims: 1. Method for improving the deformability 'of' work-hardened metallic workpieces, especially austenitic Materials such as 18/8 chrome-nickel steels and nickel-based alloys, d a d u r c h e k e n n n -z e i c h n e t that the work-hardened workpiece before further deformation is subjected to a flexing process with rotation (rotating bending).

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei dem Walkvorgang die Durchbiegung mindestens 4 mm beträgt 3. Verfahren' nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der Walkvorgang wiederholt wird, wenn das Kaltverformungsvermögen des Werkstoffes erschöpft ist. 2. The method according to claim 1, characterized in that in the The flexing process is at least 4 mm. 3. Method according to the claims 1 and 2, characterized in that the flexing process is repeated when the cold deformability the material is exhausted.

Die Erfindung betrifft ein Verfahren zur Verbesserung der. Weiterverformbarkeit von kaltverfestigten metallischen Werkstücken, insbesondere aus austenitischen Werkstoffen, wie 18/8 Chrom-Nickel-Stähle und Nickelbasislegierungen, zum Beispiel beim Ziehen von langgestrecktem Walzgut wie Rohre, Stangen, Drähte usw. The invention relates to a method for improving the. Deformability of cold-hardened metallic workpieces, in particular made of austenitic materials, such as 18/8 chrome-nickel steels and nickel-based alloys, for example when drawing of elongated rolled stock such as pipes, bars, wires, etc.

Bekannterweise werden Werkstücke einem Glühvorgang unterworfen, wenn deren Kaltverformungsvermögen erschöpft ist. In besonderen Fällen, wie z. B. der Wärmebehandlung von 18/8 Stählen, ist der Wärmebehandlung ein Reinigungsprozeß vorzuschalten. It is known that workpieces are subjected to an annealing process when whose cold deformability is exhausted. In special cases, such as B. the Heat treatment of 18/8 steels, a cleaning process must be added to the heat treatment.

Aufgabe der Erfindung ist es, ein Verfahren zur Verbesserung der Weiterverformbarkeit von kaltverfestigten metallischen Werkstücken, insbesondere aus austenitischen Werkstoffen wie 18/8 Chrom-Nickel-Stählen und Nickelbasislegierungen, vorzugsweise beim Ziehen langgestreckten Walzgutes aus diesen Werkstoffen zu schaffen, bei dem Zwischenglühungen sich erübrigen und die Oberflächenqualität wesentlich verbessert wird. The object of the invention is to provide a method for improving the Further deformability of work-hardened metallic workpieces, in particular made of austenitic materials such as 18/8 chrome-nickel steels and nickel-based alloys, to create elongated rolled stock from these materials, preferably when drawing, in which intermediate anneals are unnecessary and the surface quality is essential is improved.

Zur Lösung dieser Aufgabe wird ein Verfahren vorgeschlagen, wie es it, Patentanspruch 1 beschrieben ist. To solve this problem, a method is proposed such as it, claim 1 is described.

Vorzugsweise Ausgestaltungen ergeben sich aus den Preferably refinements result from the

Claims (1)

Unteransprüchen.Subclaims. Das erfindungsgemäße Verfahren hat neben den wirtschaftlichen Vorteilen eine wesentliche Zeit- und Energieeinsparung durch den Fortfall der Zwischenglühungen aufzuweisen. In addition to the economic advantages, the process according to the invention has a significant time and energy saving due to the omission of the intermediate annealing to have. Durch das erfindungsgemäße Walken des Werkstoffes unter Rotation wird ein Gefügezustand erreicht, der beim anschließenden Verformen zu wesentlich verbesserten Oberflächen, d. h. verbesserten Rauhigkeitswerten der Oberflächen führt Dies gilt z. B. bei Rohren auch für die Innenoberfläche. By milling the material according to the invention with rotation a structural condition is achieved that is too essential for the subsequent deformation improved surfaces, d. H. leads to improved roughness values of the surfaces This applies e.g. B. for pipes also for the inner surface. Es sei erwähnt, daß das Walken (Biegen) auf einer Rollenrichtmaschine durchgeführt werden kann, wobei dann das Rohr in Rotation (Eigenrotation) versetzt wird oder aber eine Vorrichtung benutzt wird, die um das Rohr während des Biegens rotiert. It should be mentioned that the fulling (bending) on a roller straightener can be carried out, in which case the tube is set in rotation (self-rotation) is used or a device is used, which is around the pipe during bending rotates. Die Erfindung soll nachfolgend an einem Beispiel erläutert werden: An Rohren, die im gereinigten Zustand zur Glühbehandlung bereit lagen, wurden ein rotierendes Biegen (RB) ohne Druck auf einer üblichen Richtmaschine vorgenommen. The invention will be explained below using an example: On pipes that were cleaned and ready for annealing treatment, a rotary bending (RB) carried out without pressure on a conventional straightening machine. Zum Einsatz kamen Rohre des Werkstoffes 18/8 Chrom-Nickel mit einem Durchmesser/Wandverhältnis von 44,5 4,5 mm. Die Rohre wurden reduziert in einem ersten Stangenzug auf 36,6~2,3mm und in einem zweiten Stangenzug auf 28 ~ 1,5 mm. Hier schloß sich ein Hohlzug an, bei dem die Rohre auf 21 ~ 1,5 mm reduziert wurden. Tubes made of the material 18/8 chrome-nickel with a Diameter / wall ratio of 44.5 4.5 mm. The pipes were reduced in one first rod pull to 36.6 ~ 2.3mm and in a second rod pull to 28 ~ 1.5 mm. This was followed by a hollow draft in which the tubes were reduced to 21 ~ 1.5 mm. Anstelle der nunmehr erforderlichen Glühbehandlung wurde ein rotierendes Biegen mit einer Durchbiegung von 7 mm vorgenommen. In einem anschließenden Stangenzug wurden die Abmessungen auf 18 1 mm und einem Hohlzug auf 15 ~ 1 mm reduziert. Anstelle des wiederum erforderlichen Zwischenglühens wurde ein rotierendes Biegen mit einer Durchbiegung von 7 mm durchgeführt, woran sich ein Hohlzug anschloß, bei dem das Rohr auf 12 ~ l mm gezogen wurde. Daran schloß sich wiederum ein rotierendes Biegen mit einer Durchbiegung von 7 mm und ein Hohlzug an, und zwar auf 10. 1 mm. Nach einem weiteren rotierenden Biegen mit der gleichen Durchbiegung von 7 mm erfolgte ein letzter Hohlzug auf 8. 1 mm. Hierbei wurde eine 25fache Streckung ohne die sonst erforderlichen mehrfachen Zwischenglühungen erzielt Nach einer üblichen Endglühung und nach dem Richten entsprach das Produkt bei verbesserter Oberflächenqualität den auf herkömmlichen Weg erzeugten Rohren. Die Werkstoffkennwerte, wie Zugfestigkeit, Streckgrenze, Dehnung usw. lagen im Rahmen der relevanten Werkstoffnorm. Instead of the annealing treatment that is now required, a rotating one was used Bending made with a deflection of 7 mm. In a subsequent rod train the dimensions were reduced to 18 1 mm and a hollow draw to 15 ~ 1 mm. Instead of of the intermediate annealing required in turn was a rotary bending with a Deflection of 7 mm was carried out, followed by a hollow draw, in which the Tube has been pulled to 12 ~ 1 mm. This in turn was followed by a rotary bending with a deflection of 7 mm and a hollow draw, namely to 10. 1 mm. To another rotary bending with the same deflection of 7 mm a last hollow draw on 8.1 mm. Here, a 25-fold stretch was achieved without the otherwise required multiple intermediate anneals after a conventional final annealing and after straightening, the product corresponded with improved surface quality the pipes produced in the conventional way. The material parameters, such as tensile strength, Yield point, elongation, etc. were within the framework of the relevant material standard.
DE19823209993 1982-03-16 1982-03-16 Process for improvement of the further deformability of work-hardened metallic workpieces Expired DE3209993C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19823209993 DE3209993C1 (en) 1982-03-16 1982-03-16 Process for improvement of the further deformability of work-hardened metallic workpieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823209993 DE3209993C1 (en) 1982-03-16 1982-03-16 Process for improvement of the further deformability of work-hardened metallic workpieces

Publications (1)

Publication Number Publication Date
DE3209993C1 true DE3209993C1 (en) 1983-10-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823209993 Expired DE3209993C1 (en) 1982-03-16 1982-03-16 Process for improvement of the further deformability of work-hardened metallic workpieces

Country Status (1)

Country Link
DE (1) DE3209993C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858178A1 (en) * 1998-12-17 2000-06-29 Wiederholt V W Werk Hollow precision steel profile, e.g. hydraulic, pneumatic or shock absorber cylinder, is produced from hot rolled strip by cold rolling and repeated deflection for levelling, smoothing and compaction prior to profile forming

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NICHTS-ERMITTELT *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858178A1 (en) * 1998-12-17 2000-06-29 Wiederholt V W Werk Hollow precision steel profile, e.g. hydraulic, pneumatic or shock absorber cylinder, is produced from hot rolled strip by cold rolling and repeated deflection for levelling, smoothing and compaction prior to profile forming
DE19858178C2 (en) * 1998-12-17 2002-03-21 Wiederholt V W Werk Method and device for the production of steel precision tubes, in particular cylinder tubes

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8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee