DE836034C - Process for the production of pipes of uniform wall thickness by reducing according to the stretching process - Google Patents
Process for the production of pipes of uniform wall thickness by reducing according to the stretching processInfo
- Publication number
- DE836034C DE836034C DEP19351A DEP0019351A DE836034C DE 836034 C DE836034 C DE 836034C DE P19351 A DEP19351 A DE P19351A DE P0019351 A DEP0019351 A DE P0019351A DE 836034 C DE836034 C DE 836034C
- Authority
- DE
- Germany
- Prior art keywords
- pipes
- wall thickness
- production
- uniform wall
- pipe
- 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
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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Description
Beim Reduzieren nach dem Streckverfahren läßt sich ein Anstauchen der Rohrenden und damit ein Verdicken der Wandstärken gegen das Ende der Rohre hin nicht vermeiden. Diese Verdickungen erstrecken sich auf ein beträchtliches Stück nach rückwärts und nehmen dann einen nicht unwesentlichen Teil der Rohrlänge ein. Da man Rohrluppen nach den bekannten Fertigungsverfahren nur in begrenzter Länge herstellen kann, nimmt der Ausschuß durch Wandstärkenverdickung einen beachtlichen Anteil ein.When reducing by the stretching process, upsetting can be achieved the pipe ends and thus a thickening of the wall thickness towards the end of the pipes do not avoid. These thickenings extend over a considerable distance backwards and then take a not insignificant part of the pipe length. Since one tube blanks according to the known manufacturing process only in a limited length can produce, the reject takes a considerable amount of wall thickness thickening Share a.
Gegenstand der Erfindung ist nun ein Verfahrerzum Herstellen von Rohren gleichmäßiger Wandstärken durch Reduzieren nach dem Streckverfahren, das sich dadurch kennzeichnet, daß zwei oder mehrere Rohrluppen oder Rohre vor oder während des Reduzierens aneinandergeschweißt werden. Dadurcb, daß nunmehr Rohrluppen praktisch unbegrenzter Länge zum Reduzieren nach dem Streckverfahren kommen, wird der prozentuale Ausschuß durch Wandstärkenverdickung am Rohrende so weit vermindert, daß er kaum noch eine Rolle spielt. Das Ancinanderschweißen der Rohrluppen kann finit scrrkrechten oder schrägen Schweißnähten geschehen, aber auch mit Schweißnähten, die schräg abgestuft oder zickzackförmig zur Rohrachse verlaufest.The subject matter of the invention is a process for producing pipes of uniform wall thickness by reducing by the stretching process, which is characterized in that two or more pipe blanks or pipes are welded to one another before or during the reduction. Due to the fact that pipe blanks of practically unlimited length are now being reduced after the stretching process, the percentage reject is reduced by thickening the wall thickness at the end of the pipe to such an extent that it hardly plays a role. The pipe blanks can be welded to one another with finite vertical or inclined weld seams, but also with weld seams that run obliquely or zigzag to the pipe axis.
l?s ist bekannt, Walzstäbe beliebiger Länge durch Aneinanderschweißen einzelner Walzgutstücke vor dein Walzwerk herzustellen, wobei das Aneinander-' schweil.@en durch Preßschw,eifien geschieht, indem eilte Fördervorrichtung das anzufügende Walzgutstück nach dem Verlassen gegen das vorhergehende Stück drückt und sodann auf die zusammengedrücktem Hüpfe der Stücke ein Luft- oder Sauerstoffstrom gerichtet wird, durch den die Preßschweißteinpcratur aufrechterhalten oder noch erhöht wird. Hier handelt es sich um das bloße Aneinandervon Walzstäben vollen Querschnitts nur zur Verlängerung des dem Walzwerk zugeführten Walzgutes. Eine solche Wirkung hat zwar das Verfahren nach dieser Erfindung auch, doch besteht sein wesentlicher technischer Fortschritt darüber hinaus darin, daß durch die Herstellung unbegrenzt langer Rohrluppen der das bisherige Verfahren in wirtschaftlicher Weise so außerordentlich störende Anteil an Rohrschrott deshalb praktisch völlig entfällt, weil jetzt nur ein kurzes Stück des langen Rohres Ausschuß ist und das durch Reduzieren nach dem Streckverfahren hergestellte Rohr im übrigen aber auf seiner ganzen Länge eine völlig gleichmäßige Wandstärke besitzt. Dagegen fällt die besondere Sorgfalt nicht ins Gewicht, die man bekanntlich beim Zusammenschw,eif?en von Rohren gegenüber dem wesentlich einfacheren Verschweißen von Vollquerschnitten anzuwenden hat.l? s is known to weld rolled rods of any length together to produce individual pieces of rolling stock in front of your rolling mill, whereby the welded together. @ en by Preßschw, eifien happens by the hurried conveyor device to be attached rolled piece after leaving it presses against the previous piece and then on the one that has been compressed Hop the pieces a stream of air or oxygen is directed through which the pressure welding temperature maintained or increased. Here it is a matter of mere juxtaposition Rolling bars with full cross-section only to extend the amount fed to the rolling mill Rolling stock. The method according to this invention also has such an effect, but furthermore, its essential technical advance is that through the production of tube blanks of unlimited length using the previous process in economically so extremely disruptive share of scrap pipe therefore practically completely eliminated, because now only a short piece of the long pipe is scrap and the pipe made by reducing by the stretching process, by the way but has a completely uniform wall thickness over its entire length. Against it The special care that is known to be exercised when swimming together is negligible of pipes compared to the much easier welding of full cross-sections has to apply.
In den Abb. i bis 5 sind einige Beispiele für de:i Verlauf der Rohrnähte gezeigt, unter denen man das Zusamnienschw-eil°en criitidungsgemälj durclifüliren klnti. Die Abhildun,-cri sind ohne weiteres verständlich.In Figs. I to 5 are some examples of de: i course of the pipe seams shown, under which the union is carried out according to the criteria klnti. The Abhildun, -cri are readily understandable.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP19351A DE836034C (en) | 1948-10-23 | 1948-10-23 | Process for the production of pipes of uniform wall thickness by reducing according to the stretching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP19351A DE836034C (en) | 1948-10-23 | 1948-10-23 | Process for the production of pipes of uniform wall thickness by reducing according to the stretching process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE836034C true DE836034C (en) | 1952-04-07 |
Family
ID=7367412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP19351A Expired DE836034C (en) | 1948-10-23 | 1948-10-23 | Process for the production of pipes of uniform wall thickness by reducing according to the stretching process |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE836034C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996001386A1 (en) * | 1994-07-05 | 1996-01-18 | Grant Tfw, Inc. | Enhancement of fatigue and load properties of drill pipe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE726541C (en) * | 1939-07-27 | 1942-10-15 | E H Gustav Asbeck Dr Ing | Process for the production of rolling bars of any length |
-
1948
- 1948-10-23 DE DEP19351A patent/DE836034C/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE726541C (en) * | 1939-07-27 | 1942-10-15 | E H Gustav Asbeck Dr Ing | Process for the production of rolling bars of any length |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996001386A1 (en) * | 1994-07-05 | 1996-01-18 | Grant Tfw, Inc. | Enhancement of fatigue and load properties of drill pipe |
| US5562312A (en) * | 1994-07-05 | 1996-10-08 | Grant Tfw, Inc. | Discountinuous plane weld apparatus and method for enhancing fatigue and load properties of subterranean well drill pipe immediate the area of securement of pipe sections |
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