EP0028809B1 - Procédé et dispositifs de dudgeonnage de tubes revêtus à l'intérieur - Google Patents

Procédé et dispositifs de dudgeonnage de tubes revêtus à l'intérieur Download PDF

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Publication number
EP0028809B1
EP0028809B1 EP80106822A EP80106822A EP0028809B1 EP 0028809 B1 EP0028809 B1 EP 0028809B1 EP 80106822 A EP80106822 A EP 80106822A EP 80106822 A EP80106822 A EP 80106822A EP 0028809 B1 EP0028809 B1 EP 0028809B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
tube
rolling
unexpanded
out device
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
EP80106822A
Other languages
German (de)
English (en)
Other versions
EP0028809A1 (fr
Inventor
Theo Cyron
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.)
CYRON, THEO
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT80106822T priority Critical patent/ATE13745T1/de
Publication of EP0028809A1 publication Critical patent/EP0028809A1/fr
Application granted granted Critical
Publication of EP0028809B1 publication Critical patent/EP0028809B1/fr
Expired legal-status Critical Current

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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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/06—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes in openings, e.g. rolling-in

Definitions

  • the invention relates generally to methods for rolling a tube coated on the inside with a plastic protective layer into a bore associated with this tube, the diameter of which is larger than the outside diameter of the tube.
  • the end of the tube to be rolled is inserted into the bore and, over part of its end, expanded and rolled in by a rotatable roll-in tool by means of roll-in rolls distributed over its circumference.
  • a metallic sleeve previously inserted into the pipe prevents the internal pipe coating from being destroyed during the rolling process.
  • the sleeve in the present invention is mechanically removed from the rolled-in tube immediately after the rolling-in process, without the inside Damage the protective layer of the pipe.
  • the invention also relates to devices for performing this method.
  • DE-B 1 122 031 proposes a method for rolling tubes into tube sheets, in which, before the tubes are fastened in the tube sheets, the corrosion protection layer of the tubes by a metal sleeve of small wall thickness, e.g. of 0.1-0.25 mm, covered in the area of the fastening surfaces and then the fastening of the tubes in the tube sheets in a manner known per se by the action of the fastening forces, e.g. Roll-in pressures on the metal sleeve. » It also mentions »that e.g.
  • a brass sleeve which is removed after rolling in (presumably for examination purposes), has in no way influenced the wafer-thin plastic protective coating layer of 20-50 ⁇ on the inner jacket of a condenser tube, but the layer is still fully functional. It can therefore be used sleeves made of materials that are not corrosion-resistant, for. B. iron materials, in which later corrosion has no adverse effect. The sleeve can and may later corrode or wear out during operation. » No suggestions are made for removing the sleeves or about the appropriate lengths of sleeves or rollers. From this one can clearly conclude that the sleeve provided there normally remains in the tube.
  • the object of the present invention is to carry out the above-mentioned method in such a way that no sleeves remain in the tube and the protective layer is not damaged, even when working with considerable expansion and with considerable rolling-in forces and high rolling-in speed. It is also an object of the present invention to provide suitable sleeves and devices for removing the sleeves.
  • the method according to the first claim starts from a sleeve which is longer than the roll-in rollers and which is only expanded over part of its length. This leaves a part of this sleeve with the original and therefore precisely defined masses after the sleeve has been rolled in and expanded. In this part, which is not changed by accidental differences during rolling, a mandrel with small tolerances can be inserted, which centers the pull-out device, with which the thin-walled sleeve, which is therefore sensitive to buckling or buckling, can be removed from the tube by pulling it out together can.
  • the method according to the second claim uses a pull-out device which has a circumferential projection at its end remote from the pipe mouth.
  • This pull-out device is inserted into the tube before the sleeve is inserted and rests there outside the roll-in area.
  • the sleeve is then inserted and expanded at its end adjacent to the pipe mouth.
  • the pull-out device is then pulled out of the tube together with the sleeve, because during the pull-out process the larger diameter of the pull-out protrusion of the pull-out device presses on the unexpanded end of the sleeve.
  • the sleeve is first inserted into the tube and widened at its end adjacent to the tube mouth.
  • the rolling-in device is then removed and a pull-out device is inserted, which not only has a cylindrical mandrel with small tolerances at its end which is more distant from the pipe end, but also a plurality of resilient projections in the radial direction which can grip the unexpanded edge of the sleeve.
  • the specified dimensioning of the projections ensures that they cannot damage the inner coating of the tube.
  • the sleeve is not fully inserted into the tube and, accordingly, is not widened at the projecting end. After rolling in and after removing the rolling device, the sleeve is gripped at its protruding end and pulled out.
  • This method is particularly suitable for very thin-walled sleeves, which can no longer be grasped properly even with the projections mentioned above.
  • sleeves that are approximately 25 to 30% longer than the roll-in rolls.
  • the outside diameter of these sleeves should be at least 0.5 mm smaller than the inside diameter of the unexpanded coated pipe.
  • the sleeve proposed in the fifth claim avoids damage to the inside coating of the tube during rolling. If the sleeve material had a lower strength than the pipe, the sleeve would also flow in the longitudinal direction of the pipe during rolling and would destroy the coating lying between the pipe and the sleeve as a result of the relative movement triggered under high radial pressure.
  • This expansion is intended to create a tension pressure between the tube and the tube sheet, which seals the tube perfectly in the tube sheet, even under external pressure, when heated or expanded in the longitudinal direction.
  • the local flexing work in the rolling zone of the rolls increases so much within the plastic coating that the bond between the coating and the pipe material is destroyed. If, on the other hand, the wall thickness of the sleeve is increased, then the roller forces and accordingly the adhesive strength of the sleeve in the coated tube increase accordingly, so that the removal of the sleeve without damage to the coating encounters increasing difficulties.
  • the sleeve wall thickness should not be less than 0.5 mm so that the protective layer remains undamaged.
  • the sleeve wall thickness should be about 1 mm.
  • the device proposed in the eighth claim serves to remove the sleeve according to the method proposed in the second claim.
  • the circumferential protrusion together with the mandrel that lies closely against the unexpanded part of the sleeve, serves to introduce the forces, which are very high in relation to the buckling stability of the thin-walled sleeve, to overcome the adhesive strength in an axially parallel and centric manner, and thus wedging by buckling or buckling to prevent the sleeve to be pressed out of the internally coated tube.
  • the non-expanded and thus always dimensionally correct inner diameter of the sleeve allows precise guidance on the outer diameter of the mandrel
  • the proposed circumferential projection applying the required pushing-out forces clearly in a central and uniform manner over the circumference of the relatively thin sleeve wall and applying a force-flow effect over the conical part of the transition zone transmits the roll-in area of the sleeve, which is under high ring compressive stress, so that it can be removed from the rolled-in pipe end without deformation and without damaging the coating. Since the circumferential protrusion is smaller in diameter than the unexpanded coated tube, contact between the protrusion and the coating is also avoided and damage to the coating during removal is prevented.
  • the device proposed in the ninth claim serves to carry out the method according to the third claim.
  • the mandrel serves to secure the unexpanded end of the sleeve against buckling or buckling and to allow the protrusions which are resilient in the radial direction to act on the sleeve evenly distributed over the circumference.
  • the device proposed in the tenth claim serves to carry out the method rens according to the fourth claim.
  • the mandrel serves to center the pull-out device on the sleeve and to protect the sleeve against being compressed by the segments acting from the outside.
  • Fig. 1 shows a bore 1 in a tube sheet 2 of a heat exchanger.
  • a tube 4 coated on the inside with a thermosetting corrosion protection layer 3 is inserted flush with its end 5 to be rolled into the bore 1 of the tube sheet 2.
  • the enlarged section in FIG. 1 makes the coating clear.
  • the sleeve 6, which is also flush with the face of the internally coated tube 4, is first plugged onto the rolling tool 8 up to a stop in order to clearly fix and hold its position in relation to the rolling-in area E and is stretched polygonally according to the number of rolls by spreading the rolling-in or pressure rolls 7 .
  • the rolling tool 8 rotating about its axis 9 presses the pressure rollers 7 radially apart in the rolling area E with the aid of a longitudinal movement of the cone 10 during the rotation while deforming the protective sleeve 6 and the tube 4 including the protective layer 3, until the gap 11 between the protective sleeve 6 and the inner coating 3 and gap 12 between the tube 4 and the bore 1 are eliminated and the tube 4 adheres with the desired press fit in the bore 1 of the tube sheet 2.
  • the roll-in area E can also cover the entire thickness of the tube sheet 2.
  • Fig. 2 shows the situation after rolling in and before pulling out the sleeve 6.
  • the mandrel 14 of the extracting tool 15 is with a pull rod 16 from the opening of the rolled tube from the right into the unexpanded part 17 of the sleeve 6 to Collar 18 inserted, the mating surfaces 19 take over the central guidance of the mandrel 14.
  • the device for carrying out the method only requires careful smoothing of the outer surface of the sleeve 6, as can be achieved with the usual manufacturing techniques for fine machining. However, it has been found that very high surface qualities, e.g. be achieved by electrochemical polishing, are advantageous in terms of process.
  • the application of a high-pressure lubricating film on the outer surface of the sleeve 6 can also significantly promote the process for removing the protective sleeve by reducing the adhesive sliding forces.
  • Fig. 3 corresponds to Fig. 2 with the difference that in this example, the mandrel 20 is inserted from the left into the unexpanded part 17 of the sleeve 6 via the mating surfaces 19 and resilient cams 21 behind the collar 18 at the end of the insertion path Grip sleeve 6, which transmit the axial pull-out force clearly centrically and evenly to part 17 of the protective sleeve 6.
  • Fig. 4 shows the finished state of the rolled-in internally coated tube.
  • the gap 1 indicated there can be avoided by appropriate dimensioning of the rolled-in area E.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Laminated Bodies (AREA)

Claims (10)

1. Procédé pour mandriner un tuyau (4) recouvert à l'intérieur d'une couche protectrice en plastique (3) dans un alésage (1) correspondant à ce tuyau (4); le diamètre de l'alésage (1) est plus grand que le diamètre extérieur du tuyau (4); le tuyau (4) est introduit par son extrémité à mandriner dans l'alésage (1); dans l'extrémité du tuyau à mandriner est placée une douille cylindrique métallique (6) qui est évasée et mandrinée avec le tuyau (4) sur une partie de son extrémité par un outil de mandrinage rotatif (8) moyennant des rouleaux de mandrinage (7) distribués sur sa circonférence; ensuite la douille (6) est enlevée du tuyau (4), caractérisé par le fait que
a) la douille (6) est plus longue que les rouleaux de mandrinage (7),
b) la douille (6) n'est évasée que sur une partie de sa longueur,
c) un dispositif extracteur (15), centré et appuyé par un mandrin (14) aux tolérances réduites, est introduit dans l'extrémité non évasée de la douille (6),
d) la douille (6) est sortie du tuyau (4) ensemble avec le dispositif extracteur (15).
2. Procédé suivant la revendication 1, caractérisé par le fait que
a) le dispositif extracteur (15) est introduit dans le tuyau (4) déjà avant de placer la douille (6),
b) le dispositif extracteur (15) reste dans le tuyau (4) en dehors de la zone de mandrinage E, au cours du mandrinage,
c) le dispositif extracteur (15) présente, sur son extrémité plus éloignée de la bouche du tuyau, une saillie continue dont le diamètre extérieur est plus petit que le diamètre intérieur du tuyau recouvert (4) non évasé, mais plus grand que le diamètre intérieur de la douille (6) non évasée,
d) la douille (6) est évasée à son extrémitée voisine de la bouche du tuyau.
3. Procédé suivant la revendication 1, caractérisé par le fait que
a) la douille (6) est évasée à son extrémitée voisine de la bouche du tuyau,
b) le dispositif extracteur est introduit après le mandrinage et après avoir enlevé le dispositif de mandrinage (8),
c) le dispositif extracteur présente, sur son extrémité plus éloignée de l'extrémité du tuyau, plusieurs saillies (21) élastiques en sens radial dont le diamètre extérieur le plus grand est plus petit que le diamètre intérieur du tuyau recouvert non évasé (4), mais plus grand que le diamètre intérieur de la douille (6) non évasée.
4. Procédé suivant la revendication 1, caractérisé par le fait que
a) la douille (6) déborde du tuyau (4) lors du mandrinage,
b) après avoir enlevé le dispositif de mandrinage (8), le dispositif extracteur (15) prend la douille (6) par son extrémité faisant saillie et la sort de l'extrémité du tuyau.
5. Douille suivant la revendication 1, caractérisé par le fait que
a) la résistance de la douille (6) est plus grande ou identique à la résistance du tuyau non évasé.
6. Douille suivant la revendication 1 en cas de matériaux hautement résistants de tuyau et douille, caractérisée par le fait que
a) l'épaisseur de la paroi de cette douille (6) est plus petite que l'épaisseur de paroi métallique du tuyau à mandriner,
b) l'épaisseur de paroi de la douille (6) est au moins l'épaisseur triple de la couche protectrice (3) en plastique.
7. Douille suivant la revendication 1 en cas de matériaux doux de tuyau et douille, caractérisé par le fait que
a) l'épaisseur de paroi de cette douille (6) est plus petite que l'épaisseur de paroi métallique du tuyau (4) à mandriner,
b) l'épaisseur de paroi de la douille (6) est maxi. 95% de l'épaisseur de paroi du tuyau (4) métallique.
8. Dispositif pour réaliser le procédé suivant la revendication 2, caractérisé par le fait que
a) le mandrin (14) possède un diamètre extérieur cylindrique, plus petit que le diamètre intérieur de la douille (6) non évasée,
b) le dispositif extracteur (15) a une saille continue sur son extrémité plus éloignée de la bouche du tuyau, le diamètre extérieur de cette saillie étant plus petit que le diamètre intérieur du tuyau recouvert non évasé, mais plus grand que le diamètre de la douille (6) non évasée.
9. Dispositif pour réaliser le procédé suivant la revendication 3, caractérisé par le fait que
a) le mandrin (20) possède un diamètre extè- rieur plus petit que le diamètre intérieur de la douille (6) non évasée,
b) le dispositif extracteur présente, sur son extrémité plus éloignée de l'extrémité du tuyau, plusieurs saillies (21) élastiques en sens radial, dont le diamètre extérieur le plus grand est plus petit que le diamètre intérieur du tuyau recouvert (4) non évasé, mais plus grand que le diamètre intérieur de la douille (6) non évasée.
10. Dispositif pour réaliser le procédé suivant la revendication 4, caractérisé par le fait que
a) le dispositif extracteur a un mandrin cylindrique dont le diamètre extérieur est plus petit que le diamètre intérieur de la douille (6) non évasée,
b) le dispositif extracteur comprend plusieurs segments qui peuvent être emmanchés par pression sur la douille (6) comportant le mandrin, depuis l'extérieur et de façon radiale, à la manière d'un mandrin de serrage.
EP80106822A 1979-11-08 1980-11-05 Procédé et dispositifs de dudgeonnage de tubes revêtus à l'intérieur Expired EP0028809B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106822T ATE13745T1 (de) 1979-11-08 1980-11-05 Verfahren und einrichtungen zum einwalzen von innenseitig beschichteten rohren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2945085 1979-11-08
DE19792945085 DE2945085A1 (de) 1979-11-08 1979-11-08 Verfahren und einrichtungen zum einwalzen von innenseitig beschichteten rohren

Publications (2)

Publication Number Publication Date
EP0028809A1 EP0028809A1 (fr) 1981-05-20
EP0028809B1 true EP0028809B1 (fr) 1985-06-12

Family

ID=6085459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106822A Expired EP0028809B1 (fr) 1979-11-08 1980-11-05 Procédé et dispositifs de dudgeonnage de tubes revêtus à l'intérieur

Country Status (3)

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EP (1) EP0028809B1 (fr)
AT (1) ATE13745T1 (fr)
DE (2) DE2945085A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4640114A (en) * 1985-01-29 1987-02-03 Grumman Aerospace Corporation Automated process for cold working holes
FR2592147B1 (fr) * 1985-12-23 1988-03-18 Stein Industrie Dispositif de controle de debit dans un tube d'echangeur de chaleur.
FR2609330B2 (fr) * 1985-12-23 1989-03-03 Stein Industrie Dispositif de controle de debit dans un tube d'echangeur de chaleur
DE19800910A1 (de) * 1998-01-14 1999-07-15 Itc Rohrtechnik Gmbh Rohrverbindungsverfahren und Vorrichtung zur Durchführung derselben
DE102007011868B3 (de) 2007-03-07 2008-09-04 Mannesmann Präzisrohr GmbH Verfahren zur Herstellung eines Hochdruckspeicherrohres aus Stahl für Kraftstoffeinspritzanlagen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556481A (en) * 1945-12-06 1951-06-12 Earl Lincoln Hydraulic jack
US2545527A (en) * 1947-06-21 1951-03-20 Babcock & Wilcox Co Method of forming an expanded tube and tube seat connection with an intervening metallic bonding stratum of low fusion temperature
GB629505A (en) * 1947-11-10 1949-09-21 Serck Radiators Ltd Means for extracting ferrules from the tubes of heat interchange apparatus
US2617181A (en) * 1948-04-07 1952-11-11 Chicago Pneumatic Tool Co Cylinder sleeve puller
US2573567A (en) * 1949-06-11 1951-10-30 William L Ruhle Pump and ram hydraulic lifting device
DE1122031B (de) * 1958-09-12 1962-01-18 Hubert Salmen Verfahren zum Befestigen von Rohren in Waenden, wie Einwalzen von Kondensatorrohren in Kondensatorboeden
US3057631A (en) * 1958-11-12 1962-10-09 Pittsburgh Plate Glass Co Tube extractor
US3241223A (en) * 1964-04-10 1966-03-22 Oliver B Anderson Bearing puller having grippers parallel to a screw element
US3945104A (en) * 1975-04-25 1976-03-23 Brookover Jr William S Diesel engine cylinder liner puller tool
US4152818A (en) * 1977-07-14 1979-05-08 United Aircraft Products, Inc. Making mechanical tube joints

Also Published As

Publication number Publication date
DE2945085A1 (de) 1981-05-21
ATE13745T1 (de) 1985-06-15
DE3070758D1 (en) 1985-07-18
EP0028809A1 (fr) 1981-05-20

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