DE4428435A1 - Production method for air gap insulated tube - Google Patents

Production method for air gap insulated tube

Info

Publication number
DE4428435A1
DE4428435A1 DE19944428435 DE4428435A DE4428435A1 DE 4428435 A1 DE4428435 A1 DE 4428435A1 DE 19944428435 DE19944428435 DE 19944428435 DE 4428435 A DE4428435 A DE 4428435A DE 4428435 A1 DE4428435 A1 DE 4428435A1
Authority
DE
Germany
Prior art keywords
tube wall
pressure medium
medium inlet
wall
production method
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.)
Withdrawn
Application number
DE19944428435
Other languages
German (de)
Inventor
Anton Bauer
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.)
Huber and Bauer GmbH
Original Assignee
Huber and Bauer GmbH
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 Huber and Bauer GmbH filed Critical Huber and Bauer GmbH
Priority to DE19944428435 priority Critical patent/DE4428435A1/en
Publication of DE4428435A1 publication Critical patent/DE4428435A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/051—Deforming double-walled bodies

Abstract

The production method involves two stages using internal high pressure deformation. In the first stage a mould (4) has two pressure medium unions (5 and 6) with a seal (8) for the union (5) applied against the inner tube wall (2). In the second stage a mould (10) has two pressure medium unions (11 and 12) with a seal (13) for the union (11) applied against the outer tube wall (3).

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Hohlkörpers mit einer Hohl­ wand, insbesondere eines luftspaltisolierten Rohres.The invention relates to a method for producing a hollow body with a hollow wall, in particular an air gap insulated pipe.

Der Erfindung liegt die Aufgabe zugrunde, den Hohlkörper mit geringem Arbeitsauf­ wand in genauer Form herzustellen.The invention has for its object the hollow body with little work wall in precise form.

Gemäß der Erfindung wird dieser Zweck in der Weise erfüllt, daß ein doppelwandiges Rohr durch Innenhochdruckumformung in zwei Schritten verformt wird, wobei in einer ersten mit mindestens einem Druckmitteleinführungsstutzen versehenen Form unter Abdichtung des Druckmitteleinführungsstutzens gegenüber der inneren Rohrwand diese in ihre vorgesehene Form gebracht wird und in einer zweiten mit einem Druckmittelein­ führungsstutzen versehenen Form unter Abdichtung des Druckmitteleinführungsstut­ zens nur gegenüber der äußeren Rohrwand diese in ihre vorgesehene Form gebracht wird.According to the invention, this purpose is achieved in such a way that a double-walled Tube is deformed by internal high pressure forming in two steps, one in first provided with at least one pressure medium inlet connector Sealing of the pressure medium inlet connector against the inner tube wall is brought into its intended form and in a second with a pressure medium guiding nozzle provided form under sealing of the pressure medium insertion zens only in relation to the outer tube wall brought into their intended shape becomes.

Die Zeichnungen geben ein Ausführungsbeispiel der Erfindung wieder.The drawings show an embodiment of the invention.

Fig. 1 zeigt ein Werkstück in der Ausgangsform in axialem Schnitt, Fig. 1 shows a workpiece in the initial shape in axial section,

Fig. 2 zeigt das Werkstück nach einem ersten Verformungsschritt in einer ersten Form in axialem Schnitt und Fig. 2 shows the workpiece after a first deformation step in a first shape in axial section and

Fig. 3 zeigt das Werkstück nach einem zweiten Verformungsschritt in einer zweiten Form in axialem Schnitt. Fig. 3 shows the workpiece after a second deformation step in a second form in axial section.

Das in Fig. 1 dargestellte Werkstück besteht aus einem doppelwandigen Rohr 1, des­ sen innere Rohrwand mit 2 und dessen äußere Rohrwand mit 3 bezeichnet ist. Die äußere Rohrwand 3 steht an den Enden über die innere Rohrwand 2 über.The workpiece shown in Fig. 1 consists of a double-walled tube 1 , the sen inner tube wall with 2 and the outer tube wall is designated 3 . The outer tube wall 3 projects beyond the inner tube wall 2 at the ends.

In Fig. 2 ist eine aus einem Oberteil und einem Unterteil bestehende Form 4 mit zwei Druckmitteleinführungsstutzen 5 und 6 zu erkennen. FIG. 2 shows a form 4 consisting of an upper part and a lower part with two pressure medium inlet connections 5 and 6 .

Der Druckmitteleinführungsstutzen 5 stößt stirnseitig gegen die innere Rohrwand 2 und ragt mit einem konischen Ende sowie einem Dichtring 8 in die innere Rohrwand 2. Der hydraulische Druck preßt den Dichtring 8 an die innere Rohrwand 2 sowie an den Druckmitteleinführungsstutzen 5 und bewirkt damit die Abdichtung.The pressure medium inlet connection 5 abuts the end against the inner tube wall 2 and projects with a conical end and a sealing ring 8 into the inner tube wall 2 . The hydraulic pressure presses the sealing ring 8 against the inner tube wall 2 and against the pressure medium inlet connector 5 and thus effects the seal.

Im Anschluß daran ist der Durchmesser des Druckmitteleinführungsstutzens 5 dem Innendurchmesser der äußeren Rohrwand 3 angepaßt. In geringem Abstand vom Ende der äußeren Rohrwand 3 folgt ein Absatz 9, an dem der Druckmitteleinführungsstutzen 5 einen in den Innendurchmesser der hier zylindrischen Form 4 passenden Durchmesser annimmt.Following this, the diameter of the pressure medium inlet connector 5 is adapted to the inside diameter of the outer tube wall 3 . At a short distance from the end of the outer tube wall 3 there follows a shoulder 9 , on which the pressure medium inlet connection 5 assumes a diameter that fits into the inner diameter of the cylindrical shape 4 here.

Es wären auch andere Gestaltungen möglich. Der Druckmitteleinführungsstutzen 6 symbolisiert dementsprechend einen Druckmitteleinführungsstutzen schlechthin, und zwar in ein doppelwandiges Rohr, dessen innere Wand und dessen äußere Wand bündig miteinander abschließen.Other designs would also be possible. The pressure medium inlet connector 6 accordingly symbolizes a pressure medium inlet connector par excellence, namely in a double-walled tube, the inner wall and the outer wall of which are flush with one another.

Gezeigt ist der Zustand nach der Verformung des Rohres 1. Die, allein dem hydrau­ lischen Druck ausgesetzt gewesene, innere Rohrwand 2 hat die äußere Rohrwand 3 in die Verformung mitgenommen. Beide Rohrwände sind zusammen verformt worden.The state after the deformation of the tube 1 is shown . The, alone exposed to the hydraulic pressure inner tube wall 2 has taken the outer tube wall 3 into the deformation. Both tube walls have been deformed together.

Fig. 3 läßt eine weitere aus einem Oberteil und einem Unterteil bestehende Form 10 mit zwei Druckmitteleinführungsstutzen 11 und 12 erkennen. Fig. 3 shows a further consisting of an upper part and a lower part 10 with two pressure medium inlet ports 11 and 12 .

Der Druckmitteleinführungsstutzen 11 stößt gegen die äußere Rohrwand 3 und ist die­ ser gegenüber durch einen Dichtring 13 in gleicher Weise abgedichtet wie in Fig. 2 der Druckmitteleinführungsstutzen 5 gegenüber der inneren Rohrwand 2. Im übrigen paßt der Druckmitteleinführungsstutzen 11 wiederum in das zylindrische Ende des Formhohl­ raumes.The pressure medium inlet connector 11 abuts against the outer tube wall 3 and is sealed against it by a sealing ring 13 in the same way as in FIG. 2 of the pressure medium inlet connector 5 against the inner tube wall 2 . In addition, the pressure fluid inlet 11 fits into the cylindrical end of the cavity.

Der andere Druckmitteleinführungsstutzen 12 zeigt wieder schematischer eine weitere Möglichkeit, die von einem Ausgangswerkstück mit bündigem Abschluß der inneren mit der äußeren Rohrwand auszugehen erlaubt. Der Druckmitteleinführungsstutzen 6 stößt, beispielsweise unter Abdichtung durch einen scharfen ringförmigen Vorsprung auf der Dicke der äußeren Rohrwand 3, gegen diese und nimmt die innere Rohrwand 2 in einem ringförmigen Schlitz 14 auf. Der nicht gezeichnete ringförmige Vorsprung ist mit den Pfeilen 15 angedeutet.The other pressure medium inlet connection 12 again shows schematically a further possibility, which allows starting from a starting workpiece with a flush closure of the inner and outer tube walls. The pressure medium inlet connection 6 abuts against it, for example by sealing by a sharp annular projection on the thickness of the outer tube wall 3 , and receives the inner tube wall 2 in an annular slot 14 . The not shown annular projection is indicated by the arrows 15 .

In der Form 10 verformt das eingeführte Druckmittel nur noch die äußere Rohrwand 3 weiter. Es dringt, siehe Pfeil 16, zwischen den beiden nicht gegeneinander abgedichte­ ten Rohrwänden 2 und 3 hindurch. Die innere Rohrwand 2 ist dem Druck sowohl von innen als auch von außen ausgesetzt und verbleibt daher in der vorher in der Form 4 erlangten Gestalt.In the mold 10, the pressure medium introduced only deforms the outer tube wall 3 further. It penetrates, see arrow 16 , between the two pipe walls 2 and 3 , which are not sealed off from one another. The inner tube wall 2 is exposed to the pressure both from the inside and from the outside and therefore remains in the shape previously obtained in the form 4 .

Das Nachrutschen der äußeren Rohrwand 3 an ihren Enden infolge des Materialbedarfs für die weitere Aufweitung wird im Falle des Druckmitteleinführungsstutzens 11 durch den ursprünglichen Überstand der äußeren Rohrwand 3 über die innere Rohrwand 2 (Fig. 1) ermöglicht und im Falle des Druckmitteleinführungsstutzens 12 durch den Schlitz 14.The slipping of the outer tube wall 3 at its ends as a result of the material required for the further expansion is made possible in the case of the pressure medium inlet connector 11 by the original projection of the outer tube wall 3 over the inner tube wall 2 ( FIG. 1) and in the case of the pressure medium inlet connector 12 through the slot 14 .

Die betreffende Nachführung der Druckmitteleinführungsstutzen 11 und 12 wie auch der Druckmitteleinführungsstutzen 5 und 6 ist mit Pfeilen 18 angedeutet.The relevant adjustment of the pressure medium inlet connection 11 and 12 as well as the pressure medium inlet connection 5 and 6 is indicated by arrows 18 .

Mit Ausnahme der noch abzuschneidenden Enden erscheint in Fig. 3 die fertige Form eines luftspaltisolierten Rohres mit einer Hohlwand 17.With the exception of the ends still to be cut, the finished shape of an air-gap-insulated tube with a hollow wall 17 appears in FIG. 3.

Claims (1)

Verfahren zum Herstellen eines Hohlkörpers mit einer Hohlwand (17), insbesondere eines luftspaltisolierten Rohres, dadurch gekennzeichnet, daß ein doppelwandiges Rohr (1) durch Innenhochdruckumformung in zwei Schritten (Fig. 2; Fig. 3) verformt wird, wobei in einer ersten mit mindestens einem Druckmit­ teleinführungsstutzen (5; 6) versehenen Form (4) unter Abdichtung (8) des Druckmit­ teleinführungsstutzens (5) gegenüber der inneren Rohrwand (2) diese in ihre vorgese­ hene Form gebracht wird (Fig. 1) und in einer zweiten mit einem Druckmitteleinfüh­ rungsstutzen (11; 12) versehenen Form (10) unter Abdichtung (13) des Druckmittelein­ führungsstutzens (11) nur gegenüber der äußeren Rohrwand (3) diese in ihre vorgese­ hene Form gebracht wird (Fig. 3).Method for producing a hollow body with a hollow wall ( 17 ), in particular an air-gap-insulated tube, characterized in that a double-walled tube ( 1 ) is deformed by internal high pressure forming in two steps ( Fig. 2; Fig. 3), in a first with at least a Druckmit teleinführungsstutzen ( 5 ; 6 ) provided form ( 4 ) under seal ( 8 ) of the Druckmit teleinführungsstutzens ( 5 ) with respect to the inner tube wall ( 2 ) this is brought into their intended shape ( Fig. 1) and in a second with one Pressure fluid inlet connector ( 11 ; 12 ) provided form ( 10 ) under seal ( 13 ) of the pressure medium inlet connector ( 11 ) only with respect to the outer tube wall ( 3 ) this is brought into its intended shape ( Fig. 3).
DE19944428435 1994-08-11 1994-08-11 Production method for air gap insulated tube Withdrawn DE4428435A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944428435 DE4428435A1 (en) 1994-08-11 1994-08-11 Production method for air gap insulated tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944428435 DE4428435A1 (en) 1994-08-11 1994-08-11 Production method for air gap insulated tube

Publications (1)

Publication Number Publication Date
DE4428435A1 true DE4428435A1 (en) 1996-02-15

Family

ID=6525434

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944428435 Withdrawn DE4428435A1 (en) 1994-08-11 1994-08-11 Production method for air gap insulated tube

Country Status (1)

Country Link
DE (1) DE4428435A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19713411A1 (en) * 1997-04-01 1998-10-08 Benteler Werke Ag Procedure for manufacture of double=walled exhaust bends
DE19752773A1 (en) * 1997-11-28 1999-06-02 Daimler Chrysler Ag Method for producing an air gap-insulated exhaust manifold of a vehicle exhaust system
DE19752772A1 (en) * 1997-11-28 1999-06-02 Daimler Chrysler Ag Process for producing an air-gap-insulated exhaust pipe provided with a branch connection
DE10019384A1 (en) * 2000-04-19 2001-10-31 Hamacher Karl Gmbh Method for producing a compound pipe for transport of fluid media involves application of high internal pressure to bring the loosely fitting pipes into contact with one another at least at certain points
DE10201594A1 (en) * 2002-01-16 2003-07-24 Tower Automotive Hydroforming Double-wall tube production starts from two sheets one with spacer layer as thick as required sheet interval for forming to two tubes and spacer layer removal.
CN102756033A (en) * 2011-04-27 2012-10-31 上海汇众汽车制造有限公司 Multi-layer pipe quick liquid-filled forming method and system
CN103341544A (en) * 2013-07-08 2013-10-09 丽水市海卓科技有限公司 Method and device for multi-level omega tube internal high-pressure forming
CN106269978A (en) * 2016-08-25 2017-01-04 宁波市沃瑞斯机械科技有限公司 A kind of metal bi multiple tube and processing technology thereof
CN106363070A (en) * 2016-08-25 2017-02-01 宁波市沃瑞斯机械科技有限公司 Machining process for double-layer composite metallic tube
WO2017036610A1 (en) * 2015-03-23 2017-03-09 Zs Zylinder-Service Gmbh Sealing head, device and method for producing bimetallic pipes
CN107138586A (en) * 2017-07-11 2017-09-08 南昌航空大学 A kind of structure of cutting somebody's hair for being used to seal multilayer pipe

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19713411C2 (en) * 1997-04-01 2001-02-15 Benteler Werke Ag Process for producing a double-walled exhaust manifold
DE19713411A1 (en) * 1997-04-01 1998-10-08 Benteler Werke Ag Procedure for manufacture of double=walled exhaust bends
US6539764B2 (en) * 1997-11-28 2003-04-01 Daimlerchrysler Ag Air gap insulated exhaust pipe with branch pipe stub and method of manufacturing same
DE19752772C2 (en) * 1997-11-28 1999-09-02 Daimler Chrysler Ag Process for producing an air-gap-insulated exhaust pipe provided with a branch connection
DE19752773C2 (en) * 1997-11-28 1999-09-02 Daimler Chrysler Ag Method for producing an air gap-insulated exhaust manifold of a vehicle exhaust system
DE19752772A1 (en) * 1997-11-28 1999-06-02 Daimler Chrysler Ag Process for producing an air-gap-insulated exhaust pipe provided with a branch connection
US6343417B1 (en) 1997-11-28 2002-02-05 Daimler-Benz Aktiengesellschaft Process of manufacturing an air-gap-insulating exhaust elbow of a vehicle exhaust system
US6349468B1 (en) 1997-11-28 2002-02-26 Daimlerchrysler Ag Air gap insulated exhaust pipe with branch pipe stub and method of manufacturing same
US6519851B2 (en) 1997-11-28 2003-02-18 Daimlerchrysler Ag Air gap insulated exhaust pipe with branch pipe stub and method of manufacturing same
DE19752773A1 (en) * 1997-11-28 1999-06-02 Daimler Chrysler Ag Method for producing an air gap-insulated exhaust manifold of a vehicle exhaust system
DE10019384A1 (en) * 2000-04-19 2001-10-31 Hamacher Karl Gmbh Method for producing a compound pipe for transport of fluid media involves application of high internal pressure to bring the loosely fitting pipes into contact with one another at least at certain points
DE10019384B4 (en) * 2000-04-19 2005-11-17 Karl Hamacher Gmbh Method for producing a composite pipe and a composite pipe for transporting fluid media
DE10201594A1 (en) * 2002-01-16 2003-07-24 Tower Automotive Hydroforming Double-wall tube production starts from two sheets one with spacer layer as thick as required sheet interval for forming to two tubes and spacer layer removal.
CN102756033A (en) * 2011-04-27 2012-10-31 上海汇众汽车制造有限公司 Multi-layer pipe quick liquid-filled forming method and system
CN103341544A (en) * 2013-07-08 2013-10-09 丽水市海卓科技有限公司 Method and device for multi-level omega tube internal high-pressure forming
CN103341544B (en) * 2013-07-08 2015-08-05 宁波市沃瑞斯机械科技有限公司 A kind of multistage Ω pipe inside high-pressure forming method and device
WO2017036610A1 (en) * 2015-03-23 2017-03-09 Zs Zylinder-Service Gmbh Sealing head, device and method for producing bimetallic pipes
CN106269978A (en) * 2016-08-25 2017-01-04 宁波市沃瑞斯机械科技有限公司 A kind of metal bi multiple tube and processing technology thereof
CN106363070A (en) * 2016-08-25 2017-02-01 宁波市沃瑞斯机械科技有限公司 Machining process for double-layer composite metallic tube
CN106363070B (en) * 2016-08-25 2018-08-17 宁波市沃瑞斯机械科技有限公司 A kind of processing technology of metal bi multiple tube
CN106269978B (en) * 2016-08-25 2019-01-25 宁波市沃瑞斯机械科技有限公司 A kind of metal bi multiple tube and its manufacture craft
CN107138586A (en) * 2017-07-11 2017-09-08 南昌航空大学 A kind of structure of cutting somebody's hair for being used to seal multilayer pipe
CN107138586B (en) * 2017-07-11 2018-10-19 南昌航空大学 A kind of structure of cutting somebody's hair for sealing multilayer pipe

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