EP0850114B1 - Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends - Google Patents

Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends Download PDF

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Publication number
EP0850114B1
EP0850114B1 EP96931011A EP96931011A EP0850114B1 EP 0850114 B1 EP0850114 B1 EP 0850114B1 EP 96931011 A EP96931011 A EP 96931011A EP 96931011 A EP96931011 A EP 96931011A EP 0850114 B1 EP0850114 B1 EP 0850114B1
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EP
European Patent Office
Prior art keywords
press
pressure rollers
mandrel
press mandrel
tailstock
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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.)
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EP96931011A
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German (de)
French (fr)
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EP0850114A1 (en
Inventor
Bernd Stein
Heinz Lehnert
Wilhelm Zimmermann
Heinz Steinhauer
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Dynamit Nobel GmbH Explosivstoff und Systemtechnik
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Dynamit Nobel AG
Dynamit Nobel GmbH Explosivstoff und Systemtechnik
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    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
    • B21H7/187—Rolling helical or rectilinear grooves

Definitions

  • the invention relates to a method and an apparatus for producing pressure-rolled tubes according to the preamble of claim 1 or 2, (see e.g. FR-A-468 918).
  • DE-A-44 46 919 describes a method for Ironing presses of internally toothed parts are described, whereby on a Mandrel a workpiece is arranged, which by applying force from Spinning rollers is plastically deformed.
  • the synchronous pressing method is detailed and described the counter-rotation pressing method.
  • the pressure rolling technology allows the weight advantages to be exploited to the full due to the smallest wall thicknesses because of the highest solidifications that can be achieved used materials (steel, steel alloys, aluminum and Aluminum alloys, titanium and titanium alloys, copper and copper alloys, Stainless steels etc.) and the extreme uniformity of the manufactured parts.
  • the method allows, in particular, inside the Workpieces with excellent surfaces, i.e. the roughness is extreme low. These low surface roughness ensure special Protection against cracks caused by internal notches in e.g. Exceed overloads can.
  • the process also allows high repeatability. Scattering within the work pieces is minimal.
  • the invention has for its object a method according to the preamble of claim 1 and an associated device according to the preamble of claim 2 further develop with them Cost-effective and tolerance-accurate pressure-rolled pipes with inner Wall thickenings can be made at the ends.
  • the outer diameter of the first mandrel corresponds to that Desired inner diameter of the undickened middle area of the finished pipe and the outer diameter of the paragraph corresponds to that desired inside diameter of the wall thickening.
  • the mandrel and / or the shoulder is open provide a profile on the outside.
  • the profile can only be on be attached to certain sections and advantageously consists of Ribs and grooves. However, any other conceivable profile is possible.
  • the mandrel and / or the shoulder is at least partially a polygon in cross-section, e.g. a hexagon.
  • a mandrel is here of course the first or the second mandrel or both.
  • This method and this device are particularly suitable for the production of structural parts for bicycles / motorcycles.
  • Fig. 1 shows schematically the first operation on a pressure rolling machine for the production of a tube 3 with end wall thickenings.
  • the pipe 3 is arranged on a first mandrel 1a and is by Force application of the pressure rollers 2 plastically deformed.
  • the outer diameter of the first mandrel 1a corresponds to that desired inner diameter of the later thickened central area of the finished pipe 3.
  • a tailstock-side shoulder 4 is arranged on the first mandrel 1a, the outside diameter d 1 of which corresponds to the desired inside diameter of the end-side wall thickenings of the finished tube 3.
  • the spinning rollers 2 begin on the tailstock-side paragraph 4 their forming work and work in the direction of not shown Machine spindle.
  • the feed of the spinning rollers 2 is 8 indicated.
  • Fig. 2 shows the semi-finished pipe 3a produced after this operation with the one-sided wall thickening produced on one side 5.
  • Reference number 9 is the end of processing by the spinning rollers 2 indicated.
  • the semifinished pipe 3a After the semifinished pipe 3a has been removed from the first mandrel 1a, the semifinished pipe 3a is in a second operation (see FIG. 3) on the side with the wall thickening 5 that has already been produced into a lathe chuck 6 (mandrel or the like) mounted in the press-rolling machine. ) clamped.
  • a mandrel 1 b attached to the tailstock is pushed into the semi-finished tube 3a.
  • the second mandrel 1b has an outer diameter d 2 which corresponds to the inner diameter of the wall thickening.
  • the spinning rollers 2 then form the second wall thickening from the tailstock end towards the machine spindle.
  • the reference number 12 indicates the end of processing by the pressure rollers 2.
  • Fig. 4 shows the finished pipe 3 with the end wall thickening.
  • 5 a, b, c show three different tubes 3, each with a different one Inner contour.
  • 5a shows a tube 3 with a hexagonal cross section.
  • 5b, c show a tube with fins 10 and grooves 11.
  • a pressing mandrel 1b with ribs 10 and grooves 11 is shown in FIG. They are one Many variations of these mandrels 1b, as well as paragraphs 4 possible here not all of them can be displayed.
  • the devices allow the Production of conical parts, partially conical parts, combined with partial if necessary different wall thicknesses, as well as with ribs or inside Grooves in one step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Extrusion Of Metal (AREA)

Abstract

PCT No. PCT/EP96/03870 Sec. 371 Date Sep. 1, 1998 Sec. 102(e) Date Sep. 1, 1998 PCT Filed Sep. 4, 1996 PCT Pub. No. WO97/09135 PCT Pub. Date Mar. 13, 1997A method for producing press-rolled tubes (3) with a press mandrel (1) and one or more pressure rollers (2), with the tube (3) being arranged between the press mandrel (1) and the pressure rollers (2) and being plastically deformed by means of force loading of the pressure rollers (2). To produce tubes with end wall thickenings, in a first working operation, a first press mandrel (1a) with a tailstock-end shoulder (4) is used. The pressure rollers (2) begin their transforming work at the tailstock-end shoulder (4) and work in the direction of the machine spindle. The half-finished tube (3a) is taken from the first press mandrel (1a), and, in a second working operation, the half-finished tube (3a) is clamped at the end with the wall thickening (5) which has already produced into a lathe chuck (6) (tensioning spindle or similar) mounted in the press-rolling machine, and a second press mandrel (1b), fastened on the tailstock end and having an outer diameter (d2) which corresponds to the inner diameter of the wall thickening, is pushed into the half-finished tube (3a). Then the pressure rollers (2) form the second wall thickening from the tailstock-end in the direction of the machine-spindle end.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung von drückgewalzten Rohren nach dem Oberbegriff des Anspruchs 1 bzw. 2, (siehe z.B. FR-A-468 918).The invention relates to a method and an apparatus for producing pressure-rolled tubes according to the preamble of claim 1 or 2, (see e.g. FR-A-468 918).

Bei der konstruktiven Auslegung von belasteten Teilen im Fahrzeugbau (z.B. im Fahrrad-/Motorradbau) werden rotationssymmetrische Teile (z.B. Rohre) benötigt, die möglichst leicht sein sollen, jedoch an den belasteten Stellen die notwendigen Widerstandsmomente aufweisen müssen. Dazu werden bei rohrförmigen Konstruktionsteilen z.B. innen die Enden verstärkt, die Wanddicken in der Mitte innen verstärkt, Längsrippen innen angebracht oder Kombinationen dieser Maßnahmen durchgeführt. Da die Außendimensionen dieser rohrförmigen Konstruktionsteile aus konstruktiven Gründen nicht verändert werden können, diese sogar teils genormt sind (z.B. bei Fahrrädern), werden diese Maßnahmen grundsätzlich zweckmäßigerweise bei den rohrförmigen Werkstücken innen angebracht.When designing loaded parts in vehicle construction (e.g. in Bicycle / motorcycle construction) are rotationally symmetrical parts (e.g. pipes) needed, which should be as light as possible, but in the stressed areas must have the necessary resistance moments. This will be done at tubular construction parts e.g. inside the ends reinforced, the wall thicknesses Reinforced on the inside in the middle, longitudinal ribs on the inside or combinations of these measures. Because the outer dimensions of this tubular Construction parts cannot be changed for design reasons, these are even partially standardized (e.g. for bicycles), these measures basically useful inside the tubular workpieces appropriate.

Diese Maßnahmen zur Modifikation im Innenbereich der rotationssymmetrischen Teile sind allerdings schon seit langem bekannt und sind Stand der Technik. Jedoch sind die dazu erforderlichen Maßnahmen sehr aufwendig und zum Teil auch heute noch mit vertretbaren Kosten praktisch nicht darstellbar. So kann auch heute schon ein rohrförmiges Konstruktionsteil für Fahrräder mit beiderseitiger innerer Verdickung der Rohrenden hergestellt werden. Es bedarf dazu aber mehrerer aufwendiger Ziehvorgänge und das an jedem einzelnen Konstruktionsteil. Durch die verfahrensbedingten Toleranzen bei der herkömmlichen Herstellung dieser Teile kann der Gewichtsvorteil nicht voll genutzt werden wegen des großen Toleranzfeldes z.B. der Ungleichwandigkeit (Wanddickendifferenzen), da die geringste Wanddicke in die Konstruktionsberechung eingehen muß.These measures for modification in the interior of the rotationally symmetrical However, parts have been known for a long time and are state of the art. However, the measures required for this are very complex and sometimes even today it is practically not feasible with reasonable costs. So can even today with a tubular structural part for bicycles mutual inner thickening of the pipe ends are produced. It requires but also several complex pulling processes and each one Construction part. Due to the procedural tolerances at Conventional manufacture of these parts cannot fully benefit from the weight advantage be used because of the large tolerance range e.g. of inconsistency (Wall thickness differences), since the smallest wall thickness is in the Design calculation must be received.

Aus der DE-A-44 46 919 ist ein Verfahren zum Abstreckdrücken von innenverzahnten Teilen beschrieben, wobei auf einem Drückdorn ein Werkstück angeordnet ist, welches durch Kraftbeaufschlagung von Drückrollen plastisch verformt wird. Eingehend ist das Gleichlaufdrückverfahren und das Gegenlaufdrückverfahren beschrieben. DE-A-44 46 919 describes a method for Ironing presses of internally toothed parts are described, whereby on a Mandrel a workpiece is arranged, which by applying force from Spinning rollers is plastically deformed. The synchronous pressing method is detailed and described the counter-rotation pressing method.

Dabei erlaubt die Drückwalztechnik äußerste Ausnutzungen der Gewichtsvorteile durch geringste Wanddicken wegen der erzielbaren höchsten Verfestigungen der verwendeten Materialien (Stahl, Stahllegierungen, Aluminium und Aluminiumlegierungen, Titan und Titanlegierungen, Kupfer und Kupferlegierungen, Edelstähle etc.) sowie der extremen Gleichwandigkeit der hergestellten Teile. Das Verfahren erlaubt insbesondere im Inneren der Werkstücke hervorragende Oberflächen, d.h. die Rauhigkeiten sind äußerst gering. Diese geringen Oberflächenrauhigkeiten gewährleisten besonderen Schutz gegen Risse, die von inneren Kerben bei z.B. Überbelastungen ausgehen können. Das Verfahren erlaubt darüber hinaus hohe Wiederholgenauigkeiten. Streuungen innerhalb der Werkstücke sind minimal.The pressure rolling technology allows the weight advantages to be exploited to the full due to the smallest wall thicknesses because of the highest solidifications that can be achieved used materials (steel, steel alloys, aluminum and Aluminum alloys, titanium and titanium alloys, copper and copper alloys, Stainless steels etc.) and the extreme uniformity of the manufactured parts. The method allows, in particular, inside the Workpieces with excellent surfaces, i.e. the roughness is extreme low. These low surface roughness ensure special Protection against cracks caused by internal notches in e.g. Exceed overloads can. The process also allows high repeatability. Scattering within the work pieces is minimal.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren nach dem Oberbegriff des Anspruchs 1 und eine zugehörige Vorrichtung nach dem Oberbegriff des Anspruchs 2 weiterzuentwickeln mit denen kostengünstig und toleranzgenau drückgewalzte Rohre mit inneren Wandverdickungen an den Enden hergestellt werden können.The invention has for its object a method according to the preamble of claim 1 and an associated device according to the preamble of claim 2 further develop with them Cost-effective and tolerance-accurate pressure-rolled pipes with inner Wall thickenings can be made at the ends.

Gemäß der Erfindung wird diese Aufgabe durch ein Verfahren bzw. durch eine Vorrichtung mit den Merkmalen des Anspruchs 1 bzw. 2 gelöst. Die abhängigen Ansprüche 3 bis 5 definieren bevorzugte Ausführungen der Vorrichtung gemäß der Erfindung.According to the invention, this object is achieved by a method or by an apparatus having the features of claims 1 and 2, respectively. The dependent claims 3 to 5 define preferred embodiments of the device according to the invention.

Durch dieses Verfahren ist mit einfachen Mitteln ein Rohr mit inneren Wandverdickungen an den Enden herzustellen. Es wird in der Drückwalzmaschine lediglich ein reitstockseitig befestigter zweiter Drückdorn benötigt. By this method, a tube with inner is simple Produce wall thickening at the ends. It will be in the The press-rolling machine only has a second mandrel attached to the tailstock needed.

Erfindungsgemäß entspricht der Außendurchmesser des ersten Drückdorns dem gewünschten Innendurchmesser des unverdickten mittleren Brereiches des fertigen Rohres und der Außendurchmesser des Absatzes entspricht dem gewünschten Innendurchmesser der Wandverdickungen.According to the invention, the outer diameter of the first mandrel corresponds to that Desired inner diameter of the undickened middle area of the finished pipe and the outer diameter of the paragraph corresponds to that desired inside diameter of the wall thickening.

In einer bevorzugten Ausführungsform ist der Drückdorn und/oder der Absatz auf seiner Außenseite mit einem Profil versehen. Das Profil kann auch nur auf bestimmten Abschnitten angebracht sein und besteht vorteilhafterweise aus Rippen und Nuten. Es ist jedoch jedes andere erdenkliche Profil möglich.In a preferred embodiment, the mandrel and / or the shoulder is open provide a profile on the outside. The profile can only be on be attached to certain sections and advantageously consists of Ribs and grooves. However, any other conceivable profile is possible.

In spezieller Ausführungsform ist der Drückdorn und/oder der Absatz zumindest partiell im Querschnitt ein Vieleck, wie z.B. ein Sechseck. Mit Dückdorn ist hier selbstverständlich der erste oder der zweite Drückdorn oder beide gemeint.In a special embodiment, the mandrel and / or the shoulder is at least partially a polygon in cross-section, e.g. a hexagon. With a mandrel is here of course the first or the second mandrel or both.

Dieses Verfahren und diese Vorrichtung eignen sich besonders zur Herstellung von Konstruktionsteilen für Fahrräder/Motorräder.This method and this device are particularly suitable for the production of structural parts for bicycles / motorcycles.

Weitere bevorzugte Merkmale der Erfindung ergeben sich aus den Figuren, die nachfolgend eingehend beschrieben werden. Es zeigt:

Fig. 1
schematisch den ersten Arbeitsgang zur Herstellung eines Rohres mit endseitigen Wandverdickungen;
Fig. 2
im Schnitt das halbfertige Rohr nach dem ersten Arbeitsgang;
Fig. 3
schematisch den zweiten Arbeitsgang;
Fig. 4
das fertige Rohr mit endseitigen Wandverdickungen;
Fig. 5
verschiedene Rohre mit unterschiedlichen inneren Profilen und
Fig. 6
einen zweiten Drückdorn mit einem Profil aus Rippen und Nuten.
Further preferred features of the invention result from the figures, which are described in detail below. It shows:
Fig. 1
schematically the first operation for producing a tube with end wall thickening;
Fig. 2
on average the semi-finished pipe after the first step;
Fig. 3
schematically the second operation;
Fig. 4
the finished pipe with end wall thickening;
Fig. 5
different tubes with different inner profiles and
Fig. 6
a second mandrel with a profile of ribs and grooves.

Fig. 1 zeigt schematisch den ersten Arbeitsgang auf einer Drückwalzmaschine zur Herstellung eines Rohres 3 mit endseitigen Wandverdickungen. Das Rohr 3 ist auf einem ersten Drückdorn 1a angeordnet und wird durch Kraftbeaufschlagung der Drückrollen 2 plastisch verformt. Der Außendurchmesser des ersten Drückdorns 1a entspricht dabei dem gewünschten Innendurchmesser des später unverdickten mittleren Bereichs des fertigen Rohres 3.Fig. 1 shows schematically the first operation on a pressure rolling machine for the production of a tube 3 with end wall thickenings. The pipe 3 is arranged on a first mandrel 1a and is by Force application of the pressure rollers 2 plastically deformed. The The outer diameter of the first mandrel 1a corresponds to that desired inner diameter of the later thickened central area of the finished pipe 3.

Am ersten Drückdorn 1a ist ein reitstockseitiger Absatz 4 angeordnet, dessen Außendurchmesser d1 dem gewünschten Innendurchmesser der endseitigen Wandverdickungen des fertigen Rohres 3 entspricht.A tailstock-side shoulder 4 is arranged on the first mandrel 1a, the outside diameter d 1 of which corresponds to the desired inside diameter of the end-side wall thickenings of the finished tube 3.

Als erster Arbeitsgang beginnen die Drückrollen 2 am reitstockseitigen Absatz 4 ihre Umformarbeit und arbeiten in Richtung der nicht gezeigten Maschinenspindel. Der Vorschub der Drückrollen 2 ist mit dem Bezugszeichen 8 angedeutet.As a first step, the spinning rollers 2 begin on the tailstock-side paragraph 4 their forming work and work in the direction of not shown Machine spindle. The feed of the spinning rollers 2 is 8 indicated.

Fig. 2 zeigt das nach diesem Arbeitsgang hergestellte halbfertige Rohr 3a mit der auf einer Seite hergestellten einseitigen Wandverdickung 5. Mit dem Bezugszeichen 9 ist das Ende der Bearbeitung durch die Drückrollen 2 angedeutet.Fig. 2 shows the semi-finished pipe 3a produced after this operation with the one-sided wall thickening produced on one side 5. With the Reference number 9 is the end of processing by the spinning rollers 2 indicated.

Nachdem das halbfertige Rohr 3a vom ersten Drückdorn 1a genommen wurde, wird das halbfertige Rohr 3a in einem zweiten Arbeitsgang (siehe Fig. 3) an der Seite mit der bereits hergestellten Wandverdickung 5 in ein in der Drückwalzmaschine montiertes Drehfutter 6 (Spanndorn o.ä.) eingespannt. Außerdem wird ein reitstockseitig befestigter Drückdorn 1 b in das halbfertige Rohr 3a geschoben. Der zweite Drückdorn 1b weist dabei einen Außendurchmesser d2 auf, der dem Innendurchmesser der Wandverdickung entspricht. Anschließend formen die Drückrollen 2 vom reitstockseitigen Ende aus in Richtung Maschinenspindel die zweite Wandverdickung. Mit dem Bezugszeichen 12 ist das Ende der Bearbeitung durch die Drückrollen 2 angezeigt.After the semifinished pipe 3a has been removed from the first mandrel 1a, the semifinished pipe 3a is in a second operation (see FIG. 3) on the side with the wall thickening 5 that has already been produced into a lathe chuck 6 (mandrel or the like) mounted in the press-rolling machine. ) clamped. In addition, a mandrel 1 b attached to the tailstock is pushed into the semi-finished tube 3a. The second mandrel 1b has an outer diameter d 2 which corresponds to the inner diameter of the wall thickening. The spinning rollers 2 then form the second wall thickening from the tailstock end towards the machine spindle. The reference number 12 indicates the end of processing by the pressure rollers 2.

Fig. 4 zeigt das fertige Rohr 3 mit den endseitigen Wandverdickungen. Fig. 4 shows the finished pipe 3 with the end wall thickening.

Fig. 5 a,b,c zeigen drei verschiedene Rohre 3 mit jeweils unterschiedlicher Innenkontur. Fig. 5a zeigt ein Rohr 3 mit einem sechseckigen Querschnitt. Fig. 5b,c zeigen ein Rohr mit Rippen 10 und Nuten 11.5 a, b, c show three different tubes 3, each with a different one Inner contour. 5a shows a tube 3 with a hexagonal cross section. 5b, c show a tube with fins 10 and grooves 11.

In Fig.6 ist ein Drückdorn 1b mit Rippen 10 und Nuten 11 gezeigt. Es sind eine Vielzahl von Variationen dieser Drückdorne 1b, sowie der Absätze 4 möglich, die hier nicht alle dargestellt werden können.A pressing mandrel 1b with ribs 10 and grooves 11 is shown in FIG. They are one Many variations of these mandrels 1b, as well as paragraphs 4 possible here not all of them can be displayed.

Mit den verschiedenen vorstehend beschriebenen Werkzeuganordnungen können kaltdrückgewalzte Teile mit Modifikationen im Inneren dieser Werkstücke hergestellt werden. Teils können die gewünschten Modifikationen im Inneren dieser Teile mit vertretbaren Kosten nur mit den beschriebenen Werkzeuganordnungen produziert werden. Bezogen auf die Fahrradindustrie bedeutet dies, daß mit dem Drückwalzverfahren hochfeste und dünnwandige Teile hergestellt werden können, die auf dem Sektor der Renn- und Rennsporträder sowie gegen Aluminiumräder eine gute Marktchance haben. Durch gute Gleichwandigkeiten, glatte Innenoberflächen und höchste Festigkeiten bei noch ausreichenden Dehnwerten werden dünnwandige und somit leichtere als heute übliche Bauteile möglich. Weiter erlauben die beschriebenen Vorrichtungen hohe Wiederholgenauigkeiten. Somit ist ein Teil wie das andere, da die Streuungen in den Werten minimal sind. Die Verfahren erlauben durch Variationen im Umformgrad und natürlich durch die Modifikationen im Inneren der Teile partiell unterschiedliche Widerstandsmomente und Festigkeiten. D.h., es besteht die Möglichkeit, die Stelle mit der höchsten Belastung den entsprechenden Widerstandsmomenten und Festigkeiten individuell zuzuordnen. Auch können beispielsweise an einem Teil höchste Festigkeiten an der einen Stelle und an einer anderen Stelle höchste Dehnwerte kombiniert werden. Schließlich erlauben die Vorrichtungen die Herstellung konischer Teile, partiell konischer Teile, kombiniert ggf. mit partiell unterschiedlich starken Wanddicken, sowie mit innen angebrachten Rippen oder Nuten in einem Arbeitsgang. With the various tool arrangements described above can cold press rolled parts with modifications inside these workpieces getting produced. Some of the desired modifications can be made inside these parts with reasonable costs only with the described Tool assemblies are produced. Related to the bicycle industry this means that with the pressure rolling process, high-strength and thin-walled Parts that can be manufactured in the racing and automotive sector Racing bikes and aluminum wheels have a good market opportunity. Thanks to good uniformity, smooth inner surfaces and the highest Strengths with sufficient elongation values become thin-walled and thus lighter components than possible today. Further allow the described devices high repeatability. So that's part like the other, because the scatter in the values is minimal. The proceedings allow by variations in the degree of deformation and of course by the Modifications inside the parts are partially different Moments of resistance and strength. That is, there is a possibility that Place the corresponding resistance moments with the highest load and assign strengths individually. Also, for example, on one Partly highest strengths in one place and highest in another Strain values can be combined. Finally, the devices allow the Production of conical parts, partially conical parts, combined with partial if necessary different wall thicknesses, as well as with ribs or inside Grooves in one step.

Alle diese Vorteile ergeben Kosteneinsparungen bei der Herstellung rohrförmiger Teile mit den beschriebenen Modifikationen im Inneren dieser Werkstücke.All of these advantages result in cost savings in the manufacture of tubular ones Parts with the described modifications inside these workpieces.

Claims (7)

  1. Method for producing press-rolled tubes (3) with inner wall thickenings at the ends, with the use of a press mandrel (1) and one or more pressure rollers (2), with the tube (3) being arranged between the press mandrel (1) and the pressure rollers (2) and being plastically deformed by force loading of the pressure rollers (2), and in a first working operation, a first press mandrel (1a) with a tailstock-end shoulder (4) is used, characterized in that
    the pressure rollers (2) begin their transforming work at the tailstock-end shoulder (4) and work in the direction of the machine spindle in order to produce the first wall thickening (5),
    subsequently the half-finished tube (3a) is taken from the first press mandrel (1a),
    in a second working operation, the half-finished tube (3a) is clamped into a lathe chuck (6) mounted in the press-rolling machine at the end (6) with the wall thickening (5) which has already been produced, and a second press mandrel (1b), fastened on the tailstock end and having an external diameter (d2) which corresponds to the internal diameter of the wall thickening, is pushed into the half-finished tube (3a), and
    subsequently the pressure rollers (2) form the second wall thickening from the tailstock end in the direction of the machine-spindle end.
  2. Device for producing press-rolled tubes (3) with inner wall thickenings at the ends, with a first press mandrel (1a) for a first working operation and one or more pressure rollers (2), with the tube (3) being arranged between the pressure rollers (2) and the first press mandrel (1a) and with the external diameter of the first press mandrel (1a) corresponding to the desired internal diameter of the middle region of the tube (3) which has not been thickened, and with the external diameter (d1) of the shoulder (4) corresponding to the desired internal diameter of the wall thickening, characterized by a second press mandrel (1b), fastened on the tailstock end, for a second working operation, with an external diameter (d2) which corresponds to the internal diameter of the wall thickening.
  3. Device according to claim 2, characterized in that the press mandrel (1a, 1b) and/or the shoulder (4) is provided with a profile on its outside.
  4. Device according to claim 2 or 3, characterized in that the press mandrel (1a, 1b) and/or the shoulder (4) is at least in part of polygonal cross section.
  5. Device according to one of claims 3 to 4, characterized in that the profile comprises ribs (10) and grooves (11).
  6. Use of the method according to claim 1 for producing structural parts for bicycles/motorcycles.
  7. Use of the device according to one of claims 2 to 5 for producing structural parts for bicycles/motorcycles.
EP96931011A 1995-09-07 1996-09-04 Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends Expired - Lifetime EP0850114B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19532951 1995-09-07
DE19532951A DE19532951A1 (en) 1995-09-07 1995-09-07 Method and device for the production of pressure-rolled pipes with internal wall thickening at the ends
PCT/EP1996/003870 WO1997009135A1 (en) 1995-09-07 1996-09-04 Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends

Publications (2)

Publication Number Publication Date
EP0850114A1 EP0850114A1 (en) 1998-07-01
EP0850114B1 true EP0850114B1 (en) 2000-08-09

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Application Number Title Priority Date Filing Date
EP96931011A Expired - Lifetime EP0850114B1 (en) 1995-09-07 1996-09-04 Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends

Country Status (10)

Country Link
US (1) US6038901A (en)
EP (1) EP0850114B1 (en)
JP (1) JPH11512028A (en)
KR (1) KR19990044435A (en)
CN (1) CN1195306A (en)
AT (1) ATE195274T1 (en)
CA (1) CA2228570A1 (en)
CZ (1) CZ48098A3 (en)
DE (2) DE19532951A1 (en)
WO (1) WO1997009135A1 (en)

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Also Published As

Publication number Publication date
US6038901A (en) 2000-03-21
CN1195306A (en) 1998-10-07
MX9801793A (en) 1998-08-30
CZ48098A3 (en) 1999-05-12
KR19990044435A (en) 1999-06-25
JPH11512028A (en) 1999-10-19
DE19532951A1 (en) 1997-03-13
DE59605725D1 (en) 2000-09-14
WO1997009135A1 (en) 1997-03-13
CA2228570A1 (en) 1997-03-13
ATE195274T1 (en) 2000-08-15
EP0850114A1 (en) 1998-07-01

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