EP0232257B1 - Process for the production of flanges or collars on hollow parts by lateral extrusion - Google Patents
Process for the production of flanges or collars on hollow parts by lateral extrusion Download PDFInfo
- Publication number
- EP0232257B1 EP0232257B1 EP85904093A EP85904093A EP0232257B1 EP 0232257 B1 EP0232257 B1 EP 0232257B1 EP 85904093 A EP85904093 A EP 85904093A EP 85904093 A EP85904093 A EP 85904093A EP 0232257 B1 EP0232257 B1 EP 0232257B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flanges
- lateral extrusion
- process according
- hollow
- extrusion
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K23/00—Making other articles
- B21K23/04—Making other articles flanged articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/14—Making machine elements fittings
Definitions
- the invention relates to a method for producing flanges or bundles on hollow bodies which are supported on the inside during cross-extrusion.
- Flanges formed on hollow bodies have a large number of possible uses, for example as flanges on pipes, for hubs and the like.
- Cross extrusion as a forming process is defined, for example, according to DIN 8583.
- Methods and devices for the production of tenons by the transverse extrusion method are known, as is the transverse extrusion of a bundle on solid bodies. It is also known to press gearwheels using radially movable tool elements from the outside inwards. In cross extrusion, the material flows in the radial direction partly from the outside to the center of the workpiece and partly from the center of the workpiece to the outside.
- the transverse extrusion of flanges or bundles on hollow bodies has been disadvantageous in that a fold has always occurred at the training location of the flange in the interior of the hollow part. It has now become known to avoid a fold by a combination of double-sided cup extrusion presses and cross extrusion presses.
- a hollow body with a collar or flange can also be produced by perforating the bottom of the bowl.
- the length of the hollow body that can be achieved in this way depends on the process-related ratio of length to diameter (up to approximately 4), i.e. until now only hollow parts with a process-related maximum length could be produced in this way.
- the invention has for its object to provide a method for producing hollow parts with flange or collar, which enables the production of flanges or collars without a fold in the flange or collar area at low manufacturing costs, with no procedural limitation of the length of the flanged hollow parts should occur .
- the object is achieved by the method according to the claim.
- the cross-flowing material can be deflected outwards without forming an internal fold, and the flange can be produced in a single process step.
- water is used as a support which exhibits an elastic behavior under pressures in the range from up to 10,000 bar.
- the process according to the invention can be used to produce both rotationally symmetrical and non-rotationally symmetrical flanges or bundles.
- the support can also be partially achieved by means of a mandrel, while the liquid is only used in the flange area to compensate and to reverse the flow.
- the forming can be carried out both at room temperature and at higher temperatures.
- the method can be applied to all materials that can be formed by transverse extrusion and can also form a component of other known forming methods, for example together with the drawing-in method, expanding and similar are used.
- the method according to the invention makes it possible for the first time to produce flanges or bundles on hollow bodies by means of transverse extrusion without costly process steps, without forming wrinkles in the interior of the hollow body.
- Fig. 1 shows a conventional tube with a molded collar 2 with a fold 3. It can be produced by the method according to the invention without a fold in the collar area (Fig. 2).
- water is pumped under high pressure, i.e. in the range of up to 10,000 bar for support in the cavity during the cross extrusion of a pipe. Due to the fact that water provides an elastic support that always adapts to the current geometric requirements, the desired flow direction of the material can be achieved in cross extrusion presses.
- the forming and liquid pressure is reduced and the finished workpiece can be done without further reworking of the inner flange can be removed.
- the forming can also take place simultaneously with an expansion of the tube itself during the forming of a collar, so in FIG. 2 the original tube diameter of the hollow body 5 in a forming zone 6 is expanded to the final diameter of the tube part 1 in parallel with the forming while producing the collar 2 been.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Forging (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein verfahren zur Herstellung von Flanschen oder Bunden an Hohlkörpern, die während des Querfließpressens innen abgestützt werden.The invention relates to a method for producing flanges or bundles on hollow bodies which are supported on the inside during cross-extrusion.
An Hohlkörpern ausgeformte Flansche besitzen eine Vielzahl von Anwendungsmöglichkeiten, beispielsweise als Flansche an Rohren, für Naben und ähnliches.Flanges formed on hollow bodies have a large number of possible uses, for example as flanges on pipes, for hubs and the like.
Das Querfließpressen als Umformverfahren ist beispielsweise nach der DIN 8583 definiert.Cross extrusion as a forming process is defined, for example, according to DIN 8583.
Es sind Verfahren und Vorrichtungen zur Herstellung von Zapfen nach dem Querfließpressverfahren bekannt, wie auch das Querfließpressen eines Bundes an Vollkörpern. Es ist auch bekannt, Zahnräder zu pressen, wobei von außen nach innen radialbewegliche Werkzeugelemente benutzt werden. Beim Querfließpressen fließt der Werkstoff in radialer Richtung teils von außen zur Mitte des Werkstücks und teils von der Werkstückmitte nach außen.Methods and devices for the production of tenons by the transverse extrusion method are known, as is the transverse extrusion of a bundle on solid bodies. It is also known to press gearwheels using radially movable tool elements from the outside inwards. In cross extrusion, the material flows in the radial direction partly from the outside to the center of the workpiece and partly from the center of the workpiece to the outside.
Die Massivumformung von Vollkörpern aus Stahl durch Querfließpressen eins Bundes ist beispielsweise in der Zeitschrift Draht, 35 (1984), S. 13 ff. beschrieben. Aus der DE-AS 10 87 433 ist die Innenabstützung mittels Stempel beim Querfließpressen von Nabenkörpern, insbesondere für Freilaufbremsnaben, bekannt geworden.The massive forming of solid bodies made of steel by transverse extrusion one bundle is described, for example, in the magazine wire, 35 (1984), p. 13 ff. From DE-AS 10 87 433 the internal support by means of stamps during cross extrusion of hub bodies, in particular for freewheel brake hubs, has become known.
Bisher war das Querfließpressen von Flanschen oder Bunden an Hohlkörpern insofern nachteilig, als stets an der Ausbildungsstelle des Flansches im Innenraum des Hohlenteils eine falte entstand. Es ist nun zwar bekanntgeworden, durch eine Kombination aus zweitseitigem Napf- Rückwärts- Fließpressen und Querfließpressen eine Falte zu vermeiden. Auch durch Lochen des Napfbodens ist ein Hohlkörper mit einem Bund oder Flansch herstellbar. Die derart erreichbare Länge des Hohlkörpers ist jedoch von dem verfahrensbedingten Verhältnis Länge zu Durchmesser (bis ungefähr 4) abhängig, d.h., bisher konnten auf diese Weise nur Hohlteile mit verfahrensbedingter Maximallänge hergestellt werden.So far, the transverse extrusion of flanges or bundles on hollow bodies has been disadvantageous in that a fold has always occurred at the training location of the flange in the interior of the hollow part. It has now become known to avoid a fold by a combination of double-sided cup extrusion presses and cross extrusion presses. A hollow body with a collar or flange can also be produced by perforating the bottom of the bowl. However, the length of the hollow body that can be achieved in this way depends on the process-related ratio of length to diameter (up to approximately 4), i.e. until now only hollow parts with a process-related maximum length could be produced in this way.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Herstellen von Hohlteilen mit Flansch oder Bund anzugeben, welches die Herstellung von Flanschen oder Bunden ohne Falte im Flansch oder Bundbereich bei niederen Herstellungskosten ermöglicht, wobei keine verfahrensbedingte Einschränkung der Länge der mit Flanschen versehenen Hohlteile auftreten soll.The invention has for its object to provide a method for producing hollow parts with flange or collar, which enables the production of flanges or collars without a fold in the flange or collar area at low manufacturing costs, with no procedural limitation of the length of the flanged hollow parts should occur .
Die Aufgabe wird durch das Verfahren gemöß Anspruch gelöst.The object is achieved by the method according to the claim.
Überraschenderweise kann dadurch, daß eine solche Innenabstützung des Hohlkörpers während des Querfließpressens erfolgt, eine Umlenkung des querfließenden Materials nach außen erfolgen, ohne Bildung einer inneren Falte, und der Flansch kann in einem einzigen Verfahrenschritt hergestellt werden.Surprisingly, because such an internal support of the hollow body takes place during the transverse extrusion, the cross-flowing material can be deflected outwards without forming an internal fold, and the flange can be produced in a single process step.
Durch diese Abstützung wird ein variabler gesteuerter Stofffluß erzielt. Herkömmlich hergestellte Teile mit Bundfalte, die nach kostengünstigen Querfließpressverfahren hergestellt wurden, konnten nur für untergeordnete Zwecke eingesetzt werden, da die Falte in der Festigkeitsrechnung praktisch nicht erfaßbar ist und gleichzeitig eien Ausgangspunkt für Risse bei Belastung und den Bruch des Bauteils darstellt.A variable controlled material flow is achieved through this support. Conventionally manufactured parts with pleats, which were produced using inexpensive cross-extrusion processes, could only be used for subordinate purposes, since the fold is practically undetectable in the strength calculation and at the same time represents a starting point for cracks under load and breakage of the component.
Bei einer besonders bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird Wassser als Abstützung eingesetzt, welches unter Drücken im Bereich von bis 10.000 bar ein elastisches Verhalten zeigt.In a particularly preferred embodiment of the method according to the invention, water is used as a support which exhibits an elastic behavior under pressures in the range from up to 10,000 bar.
Durch das erfindungsgemäße Verfahren können sowohl rotationssymmetrische als auch nicht rotationssymmetrische Flansche oder Bunde hergestellt werden.The process according to the invention can be used to produce both rotationally symmetrical and non-rotationally symmetrical flanges or bundles.
Die Abstützung kann auch teilweise durch einen Dorn erzielt werden, während nur im Flanschenbereich die Flüssigkeit zum Ausgleich und zur Flußumkehr eingesetzt wird.The support can also be partially achieved by means of a mandrel, while the liquid is only used in the flange area to compensate and to reverse the flow.
Das Umformen kann sowohl bei Raumtemperatur als auch bei höheren Temperaturen durchgeführt werden.The forming can be carried out both at room temperature and at higher temperatures.
Das Verfahren ist auf alle durch Querfließpressen umformbaren Werkstoffe anwendbar und kann auch einen Bestandteil an sich bekannter anderer Umformverfahren bilden, beispielsweise gemeinsam mit Einziehverfahren, Aufweiten und ähnlichem eingesetzt werden.The method can be applied to all materials that can be formed by transverse extrusion and can also form a component of other known forming methods, for example together with the drawing-in method, expanding and similar are used.
Besonders bevorzugt kann Stahl nach dem erfindungsgemäßen Verfahren querfließgepreßt werden.Steel can particularly preferably be extruded using the process according to the invention.
Durch das erfindungsgemäße Verfahren ist es erstmals möglich, ohne kostenaufwendige Verfahrensschritte durch Querfließpressen Flansche oder Bunde an Hohlkörpern ohne Faltenbildung im Innenraum des Hohlkörpers herzustellen.The method according to the invention makes it possible for the first time to produce flanges or bundles on hollow bodies by means of transverse extrusion without costly process steps, without forming wrinkles in the interior of the hollow body.
Im nachfolgenden wird ein Anwendungsbeispiel anhand der beigefügten Zeichnung näher erläutert.In the following, an application example is explained in more detail with reference to the attached drawing.
- Fig. 1Fig. 1
- einen Schnitt durch ein herkömmliches Verfahrensprodukt und a section through a conventional process product and
- Fig. 2Fig. 2
- das Angreifen der Kräfte, die sich im elastischen/ plastischen Medium auf die Innenwände des Hohlkörpers beim Querfließpressen auswirken. the attack of the forces that affect the inner walls of the hollow body during cross-extrusion in the elastic / plastic medium.
Fig. 1 zeigt ein herkömmliches Rohr mit einem angeformten Bund 2 mit Falte 3. Es kann durch das erfindungsgemäße Verfahren ohne Falte im Bundbereich hergestellt werden (Fig. 2).Fig. 1 shows a conventional tube with a molded
Bei einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird Wasser unter hohem Druck, d.h. im Bereich von bis 10.000 bar zur Abstützung in den Hohlraum während des Querfließpressens eines Rohr gespreßt. Dadurch, daß Wasser eine elastische, sich stets den momentanen geometrischen Anforderungen anpassende Abstützung bewirkt, kann die erwünschte Fließrichtung des Materials bei Querfließpressen erzielt werden.In a preferred embodiment of the process according to the invention, water is pumped under high pressure, i.e. in the range of up to 10,000 bar for support in the cavity during the cross extrusion of a pipe. Due to the fact that water provides an elastic support that always adapts to the current geometric requirements, the desired flow direction of the material can be achieved in cross extrusion presses.
Nach beendetem Querfließpressen wird der Umform- und Flüssigkeitsdruck abgebaut und das fertige Werkstück kann ohne weitere Nacharbeitung des Innenflansches entnommen werden.After the transverse extrusion has been completed, the forming and liquid pressure is reduced and the finished workpiece can be done without further reworking of the inner flange can be removed.
Die Umformung kann auch gleichzeitig mit einer Aufweitung des Rohres selbst während des Anformen eines Bundes erfolgen, so ist in Fig. 2 der ursprüngliche Rohrdurchmesser des Hohlkörpers 5 in einer Umformzone 6, paralell zur Umformung unter Herstellung des Bundes 2 auf den Enddurchmesser des Rohrteils 1 erweitert worden.The forming can also take place simultaneously with an expansion of the tube itself during the forming of a collar, so in FIG. 2 the original tube diameter of the
Claims (7)
- Process for the production of flanges or collars on hollow parts by way of a lateral extrusion process, whereby the hollow body is internally supported during the lateral extrusion process, characterised in that the support means is a liquid which is entered into the hollow space.
- Process according to claim 1, characterised in that water is used as a support means.
- Process according to one of the above claims, characterised in that the flange or the collar is symmetrical with respect to rotation.
- Process according to one of claims 1 to 3, characterised in that the flange is not symmetrical with respect to rotation.
- Process according to one of the above claims, characterised in that a pin is entered into the hollow space, in addition to the liquid, as a support means during the lateral extrusion process.
- Process according to one of the above claims, characterised in that the deformation is carried out at increased temperature.
- Process according to one of the above claims, characterised in that the material to be deformed and laterally extruded is steel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/DE1985/000276 WO1987001062A1 (en) | 1985-08-14 | 1985-08-14 | Process for the production of flanges or collars on hollow parts by lateral extrusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0232257A1 EP0232257A1 (en) | 1987-08-19 |
| EP0232257B1 true EP0232257B1 (en) | 1991-05-29 |
Family
ID=6776124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85904093A Expired - Lifetime EP0232257B1 (en) | 1985-08-14 | 1985-08-14 | Process for the production of flanges or collars on hollow parts by lateral extrusion |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4782679A (en) |
| EP (1) | EP0232257B1 (en) |
| DE (1) | DE3583041D1 (en) |
| WO (1) | WO1987001062A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5724850A (en) * | 1993-03-26 | 1998-03-10 | Honda Giken Kogyo Kabushiki Kaisha | Rear fork for a motorcycle |
| CN1060415C (en) * | 1997-04-25 | 2001-01-10 | 张应宪 | Technological process of manufacturing steel flange blank |
| US6098437A (en) * | 1998-03-20 | 2000-08-08 | The Budd Company | Hydroformed control arm |
| US6209372B1 (en) | 1999-09-20 | 2001-04-03 | The Budd Company | Internal hydroformed reinforcements |
| CA2326746A1 (en) | 1999-11-24 | 2001-05-24 | Wolfgang K. Rohn | Modular roof and headliner assembly |
| FR2807684B1 (en) * | 2000-04-17 | 2002-07-19 | Michel Beffrieu | MODULAR TOOL CARRIER |
| EP2030701A1 (en) * | 2007-08-25 | 2009-03-04 | IFUTEC Ingenieurbüro für Umformtechnik GmbH | Tool and method for producing a hollow body |
| DE102010009345B4 (en) | 2010-02-25 | 2011-09-22 | Schuler Cartec Gmbh & Co. Kg | Method and tool for producing a component and a component produced by deformation |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US203842A (en) * | 1878-05-21 | Improvement in the methods of bending plumbers traps | ||
| US2138199A (en) * | 1935-09-28 | 1938-11-29 | Frans B Wendel | Method of making metal fittings and the like |
| US2198643A (en) * | 1935-09-28 | 1940-04-30 | W S A Inc | Method of and apparatus for making hollow articles |
| US2200664A (en) * | 1937-10-22 | 1940-05-14 | Northern Indiana Brass Co | Method of forming hollow metal members |
| US2168641A (en) * | 1938-03-07 | 1939-08-08 | Northern Indiana Brass Co | Die mechanism |
| US2328742A (en) * | 1941-02-17 | 1943-09-07 | Thompson Prod Inc | Method of making flanged tubing |
| US2960763A (en) * | 1955-10-11 | 1960-11-22 | Reymond M Reichl | Method of forging with thin webs |
| US3286498A (en) * | 1964-02-03 | 1966-11-22 | Gen Electric | Compressive forming |
| NL6607578A (en) * | 1965-06-04 | 1966-12-05 | ||
| US3442106A (en) * | 1966-09-12 | 1969-05-06 | Mueller Brass Co | Method and apparatus for making wrought metal branch fittings |
-
1985
- 1985-08-14 US US07/037,256 patent/US4782679A/en not_active Expired - Lifetime
- 1985-08-14 DE DE8585904093T patent/DE3583041D1/en not_active Expired - Lifetime
- 1985-08-14 WO PCT/DE1985/000276 patent/WO1987001062A1/en active IP Right Grant
- 1985-08-14 EP EP85904093A patent/EP0232257B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0232257A1 (en) | 1987-08-19 |
| US4782679A (en) | 1988-11-08 |
| DE3583041D1 (en) | 1991-07-04 |
| WO1987001062A1 (en) | 1987-02-26 |
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