EP0121252B1 - Verfahren und Werkzeugsatz zum Walzen quergerippter Rohre - Google Patents

Verfahren und Werkzeugsatz zum Walzen quergerippter Rohre Download PDF

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Publication number
EP0121252B1
EP0121252B1 EP19840103535 EP84103535A EP0121252B1 EP 0121252 B1 EP0121252 B1 EP 0121252B1 EP 19840103535 EP19840103535 EP 19840103535 EP 84103535 A EP84103535 A EP 84103535A EP 0121252 B1 EP0121252 B1 EP 0121252B1
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EP
European Patent Office
Prior art keywords
rib
tube
tools
disks
profile
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
EP19840103535
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English (en)
French (fr)
Other versions
EP0121252A2 (de
EP0121252A3 (en
Inventor
Janusz Przybyla
Zygmunt Gozdziewicz
Andrzej Szal
Ryszard Zub
Andrzej Maczynski
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.)
ZAKLADY URZADZEN CHEMICZNYCH METALCHEM IM. WLADYSL
Original Assignee
Zaklady Urzadzen Chemicznych METALCHEM im Wladyslawa Planetorza
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 Zaklady Urzadzen Chemicznych METALCHEM im Wladyslawa Planetorza filed Critical Zaklady Urzadzen Chemicznych METALCHEM im Wladyslawa Planetorza
Publication of EP0121252A2 publication Critical patent/EP0121252A2/de
Publication of EP0121252A3 publication Critical patent/EP0121252A3/en
Application granted granted Critical
Publication of EP0121252B1 publication Critical patent/EP0121252B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • 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
    • B21C37/207—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 with helical guides

Definitions

  • the subject matter of the invention is a method of rolling transverse ribbed bimetallic tubes and a set of tools for rolling laterally ribbed bimetallic tubes, especially ribs having a small thickness, finding application in heat exchangers.
  • Rolling the ribs on tubes consists in pressing down rotationally driven multi-disk tools onto the surface of the tube.
  • a set of three tools comprising sets of disks realizing several stages of producng the rib, which are chasing the tube, drawing the rib and forming the shape of the rib.
  • the external ribbed tube is additionally pressed down onto the internal core tube in order to provide for good adhesion of tubes and an improvement of thermal conduction.
  • Another tool for rolling ribs on bimetallic tubes is known from the PL-A-79817.
  • a set of unsymmetrical piano-convergent disks is additi- nally applied.
  • Such a design of the tool enables in the first stage the formation of a low rib, and then intensive bilateral thinning thereof with simultaneous increasing of the height thereof.
  • the thinning process creates the tendency to increase the diameter of the perimeter of the rib, while the radial flow of metal in the region adjacent to the tops of the initial disks leads to the formation of draw-in directly under the rib.
  • the set of unsymmetrical disks performs the work of causing the previously formed draw-in to be shifted to the region of the direct action of the last burnishing disk.
  • the ribs are rolled by introducing after initially chasing the tube, drawing and forming the rib, additional operations consisting in annealing and then several-times-repeated contraflexure of ribs in relation to the axis perpendicular to the direction of rolling, and pressing down the external tube of the core tube during contraflexure.
  • the tool for realization of the said method comprises, apart from the known sections of initial disks, a supporting disk increasing the rigidity of the tool and initially deflecting the rib, a section of contraflexure disks at a certain distance from this disk, inside which there are burnishing disks, and also, as the last one, the disk straightening the rib.
  • a method of rolling transverse ribbed bimetallic tubes comprising an external tube and a core tube by means of rotary tools composed of roll-shaped disks comprises:
  • the rib is deflected unilaterally non-linearly preferably parabolically. Because of this the deflection of the rib at its base is negligible and this protects it against destruction even in the case of local cracks in the rib caused by defects of the surface of the tube being rolled. Moreover, by pressing down the external tube onto the core tube (internal tube) immediately after deflecting the rib, both steps being performed during one revolution of the tube, eliminates the necessity of conducting the rib through subsequent stages of the treatment thereof, thereby reducing the number of contraflexures harmful to very thin ribs. By this method it is possible to roll industrially for example on aluminium tubes ribs of the average thickness of from 0.3 to 0.4 mm.
  • the essence of the set of tools for rolling transverse ribbed bimetallic tubes according to the invention consists in that the set is composed of three tools, whereof each one comprises roll-shaped disks forming the section for chasing the tube, the section for drawing the rib and the section for forming the shape of the rib, each followed by a supporting disk and a straightening disk, said disks being axially aligned whereby each of the supporting disks has a profile with a first upstream lateral face corresponding to the profile of the last forming disk, and a second lateral face, the second lateral face having a non-linear profile.
  • the outer diameter of the supporting disk furthest downstream is greater by from 0.1 to 0.8 mm than the outer diameter of the other supporting disks.
  • the non-linear profile is preferably a concave parabolic profile.
  • the concave profile of the second part of supporting disks is preferably a segment of a parabola, included within the quantity range x from 0 to 6 mm in the equation where axis x is the axis of the tool, axis y lies in the plane of the base of the supporting disk, coefficient A>0, coefficient B--O, and coefficient C corresponds to the quantity of the radius of the base of the supporting disk.
  • the set of tools for rolling is characterized by great rigidity and is simple in design.
  • This disk By increasing the outer diameter of the last supporting disk, this disk being the least loaded with forces along the axis, it performs the additional work of pressing down the external tube onto the core tube. It has appeared that such pressing down with one supporting disk after previously deflecting the rib enables the obtaining of bimetallic tubes practically without inter-tube gap, of correct parameters of thermal conduction.
  • the parabolic shape of supporting disks is close to the optimum shape of the section of the supporting disk of constant bending strength, said bending being caused by rolling forces along the axis.
  • the set of tools consists of three tools 1, and 3 situated every 120° round the external tube 4, inside which a core tube 5 is placed.
  • the tools are composed of roll-shaped disks 6 forming sections for chasing the tube, for drawing the rib and for forming the shape thereof, supporting disks 7 and 8 and straightening disks 9.
  • Supporting disk 7 and 8 have a profile with a first upstream lateral face corresponding to the profile of the last forming disk, and a second lateral face that is parabolic.
  • the selection of quantities A and B depends on the geometry of the ribs and the diameter of the charge tube, namely, the external tube 4.
  • the external tube 4 together with the core tube 5 after passing through the zone of the action of the roll-shaped disks 6 moves with rotary-translatory motion (helically) to the zone of the action of supporting disks 7 and 8.
  • Supporting disks 7 situated in the first tools 1 and 2 in relation to the direction of rolling deflect the rib 11 parabolically.
  • the supporting disk 8 situated on the third, the furthest downstream tool 3, has an outer diameter larger by from 0.1 to 0.8 mm than the outer diameter of the first supporting disks 7.
  • the increased diameter of the disk 8 causes the external tube 4 to be pressed down onto the core tube 5.
  • the rib 11 is straightened in the last stage of rolling by the straightening disk 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Forging (AREA)

Claims (5)

1. Verfahren zum Walzen von quergerippten, ein Außenrohr (4) und ein Kernrohr (5) umfassenden Bimetallrohren mittels sich drehender Werkzeuge (1, 2, 3), die sich aus walzenförmigen Scheiben (6) zusammensetzen, wobei das Verfahren umfaßt:
-anfängliches Drücken des Außenrohres (4) zum Ziehen und Formen einer Rippe;
-Abbiegen jeder geformten Rippe nichtlinear in Walzrichtung;
-dann Herunterdrücken des Außenrohres auf das Kerhrohr;
-Durchführend des Abbiegens der Rippe und des Herunterdrückens des Außenrohres auf das Kernrohr während einer Umdrehung des Rohres;
-und danach Geraderichten der Rippe.
2. Verfahren nach Anspruch 1, gemäß dem das nichtlinieare Abbiegen parabolisch erfolgt.
3. Satz von Werkzeugen zum Walzen quergerippter Bimetallrohre, der sich aus drei Werkzeugen (1, 2, 3) zusammensetzt, von denen jedes walzenförmige Schreiben (6) umfaßt, die den Abschnitt zum Drücken des Rohres (4), den Abschnitt zum Ziehen der Rippe (11) und den Abschnitt zum Ausbilden der Form der Rippe (11) umfassen, wobei jede dieser Scheiben gefolgt ist von einer Stützscheibe (7, 8) zum Abbiegen der Rippe und einer Geraderichtscheibe (9), welche Scheiben (6, 7, 8, 9) axial ausgerichtet sind, wobei jede Stützscheibe (7, 8) ein Profil mit einer ersten stromaufliegenden Seitenfläche hat, die dem Profil der letzten Formscheibe entspricht und eine zweite Seitenfläche, dadurch gekennzeichnet, daß die zweite Seitenfläche ein nichtlineares Profil hat, und daß der Außendurchmesser der Stützscheibe (8) weiter stromab im Bereich von 0,1 bis 0,8 mm größer ist als der Außendurchmesser der anderen Stützscheibe (7).
4. Satz von Werkzeugen nach Anspruch 1, bei dem das nichtlineare Profil ein konkaves parabolisches Profil ist.
5. Satz von Werkzeugen nach Anspruch 4, bei dem das Profil der genannten zweiten Seitenfläche ein Segment einer Parabel der Gleichung
Figure imgb0004
ist, bei der x von 0 bis 6 mm beträgt, die x-Achse die Werkzeugachse ist, die y-Achse in der Ebene der Basis der Stützscheibe liegt, der Koeffizient A>0, der Koeffizient B?0 ist und der Koeffizient C der Größe des Radius der Basis des Stützscheibe entspricht.
EP19840103535 1983-03-31 1984-03-30 Verfahren und Werkzeugsatz zum Walzen quergerippter Rohre Expired EP0121252B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL241324 1983-03-31
PL24132483A PL139849B1 (en) 1983-03-31 1983-03-31 Method of rolling of transversally finned pipes and set of tools therefor

Publications (3)

Publication Number Publication Date
EP0121252A2 EP0121252A2 (de) 1984-10-10
EP0121252A3 EP0121252A3 (en) 1987-05-27
EP0121252B1 true EP0121252B1 (de) 1989-06-07

Family

ID=20016489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840103535 Expired EP0121252B1 (de) 1983-03-31 1984-03-30 Verfahren und Werkzeugsatz zum Walzen quergerippter Rohre

Country Status (7)

Country Link
EP (1) EP0121252B1 (de)
CS (1) CS247078B2 (de)
DE (1) DE3478581D1 (de)
HU (1) HU197237B (de)
PL (1) PL139849B1 (de)
RO (1) RO89288A (de)
SU (1) SU1268094A3 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1084142A (de) * 1900-01-01
US3683656A (en) * 1970-03-25 1972-08-15 Carl M Lewis Heat exchanger apparatus and method of making the same
PL79817B1 (de) * 1973-11-22 1975-08-30
ZA764761B (en) * 1976-08-09 1978-01-25 Heat Exchangers Africa Ltd Finned tubing
PL113419B1 (en) * 1977-01-26 1980-12-31 Zaklad Doswiadczalny Przy Zakl Method of rolling transversely finned pipes and workingtool therefor

Also Published As

Publication number Publication date
SU1268094A3 (ru) 1986-10-30
RO89288A (ro) 1986-03-15
EP0121252A2 (de) 1984-10-10
CS247078B2 (en) 1986-11-13
EP0121252A3 (en) 1987-05-27
HU197237B (en) 1989-03-28
PL241324A1 (en) 1984-10-08
HUT38065A (en) 1986-04-28
PL139849B1 (en) 1987-02-28
DE3478581D1 (en) 1989-07-13

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