EP0123923B1 - Verfahren zum Einwalzen von Rippen in Rohre - Google Patents

Verfahren zum Einwalzen von Rippen in Rohre Download PDF

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Publication number
EP0123923B1
EP0123923B1 EP19840103536 EP84103536A EP0123923B1 EP 0123923 B1 EP0123923 B1 EP 0123923B1 EP 19840103536 EP19840103536 EP 19840103536 EP 84103536 A EP84103536 A EP 84103536A EP 0123923 B1 EP0123923 B1 EP 0123923B1
Authority
EP
European Patent Office
Prior art keywords
tube
ribs
tubes
tool
stresses
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
EP19840103536
Other languages
English (en)
French (fr)
Other versions
EP0123923A1 (de
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 EP0123923A1 publication Critical patent/EP0123923A1/de
Application granted granted Critical
Publication of EP0123923B1 publication Critical patent/EP0123923B1/de
Expired legal-status Critical Current

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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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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 or 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 or tubes with decorated walls with helical guides

Definitions

  • the subject of the invention is a method of drawing ribs on tubes, especially ribs of small pitches or ribs on tubes of low-plastic materials.
  • Forming the ribs on the tube is the result of producing in the zone of the action of the tool a corresponding state of stresses in the material of the tube, causing a plastic strain.
  • the material of the tube deforms in the zone of the action of the tool in the axial and radial direction.
  • Radial strain manifests itself in a form of increasing the diameter of ribs
  • axial strain manifests itself in a form of elongation of the tube.
  • Elongation of the tube in the process of drawing the ribs is a disadvantageous phenomenon because the quantity of the elongation is random variable for each segment of the tube. This characteristic causes the necessity of applying technological allowances, and thus, production of wastes.
  • Axial strains of the tube are caused by corresponding axial stresses induced by the tool in the zone of its operation.
  • the tool In the result of the action of the said stresses the tool is subject to very high loads in the axial direction.
  • the said loads cause bending out the disks of which the tool consists.
  • the pitch of ribs In the result thereof the pitch of ribs is not uniform and always bigger than the pitch of the disks.
  • the substantial problem in the hitherto applied methods of drawing the ribs is a low durability of the tool whose disks are destroyed in the result of the action of bending loads of a fatigue character.
  • polish patent specification No. 113419 presents the design of a tool with the use of an additional disk stiffening the tool and increasing its durability. Such a solution does not eliminate, however, the elongation of the tube and it is difficult to draw ribs of very small pitches on tubes of materials having big resistance of the plastic strain because the increase of loads in the axial direction of the tool is considerably bigger than the possibility of increasing the rigidity of the tool.
  • a method is known of producing bimetallic ribbed tubes with the application of blocking the possibility of elongation of the tube on which ribs are drawn.
  • This blocking consists in clamping the end of the external tube on the internal tube, and then the drawing process starts from the second, free end of the tube.
  • different values of axial stresses are observed along the length of the tube.
  • axial stresses in the non-deformed part of the tube grow systematically till reaching a definite state of equilibrium of stresses in the material of the external tube.
  • the essence of the method of drawing ribs on tubes according to the invention consists in that to the material of the tube from which ribs are drawn initial compressive stress is introduced, of the quantity smaller than the elasticity limit Re of the material of the tube, and then in the zone of the action of disk tools, with maintenance of the initial compressive stress in the material of the tube, ribs are formed by pressing down the tube driven rolling-disk tools. It is preferable when the quantity of the initial compressive strength is in the range of where Fo denotes the size of the area of the section of the tube, and Fr denotes the size of the area of the section of the core of the tube, after drawing the rib.
  • the tool By introducing the initial state of compressive stresses to the material of deformed tube, the tool is discharged from loads along the axis, bending out the rolling-form-disks, practically already in the first stage of the contact of the tool with the material.
  • Another effect of introducing the initial state of compressive stresses is the avoidance of the axial elongation of the tube. In these conditions the work or the tool resolves itself to inducing plastic strains of the tube in the radial direction.
  • the tube 1 before the operation of drawing ribs has been clamped with a screw 2, thus inducing the origination of an initial compressive stress of an established quantity.
  • the quantity of the said stress is preferably in the range of where Fo is the size of the area of the cross-section of the tube before the drawing operation, Fr is the size of the area of the cross-section of the core of the tube 3 after the operation of drawing the rib 4, and Re is the elasticity limit of the material of the tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (2)

1. Verfahren zum Einwalzen von Rippen, in bV Rohre durch Verwenden von drehangetriebenen Werkzeugen, die als Form Scheiben umfassen, dadurch gekennzeichnet, daß in das Material des Rohres (3), in das Rippen (4) eingewalzt werden, eine anfängliche Kompressionskraft einer Stärke eingebracht wird, die kleiner ist als die Elastizitätsgrenze Re des Materials des Rohres, und daß dann in der Zone der Wirkung der Scheibenwerkzeuge (6) unter Aufrechterhaltung der anfänglichen Kompressionsbeanspruchung im Material des Rohres Rippen dadurch ausgebildet werden, daß die angetriebenen Walzformscheibenwerkzeuge in das Rohr getrieben werden.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Stärke der anfänglichen Kompressionskraft im Bereich von
Figure imgb0004
liegt, wobei Fo die Größe des Bereiches des Querschnitts des Rohres vor dem Einwalzen bezeichnet und Fr die Größe des Bereiches des Querschnitts des Kerns des Rohres (3) nach dem Einwalzen der Rippe.
EP19840103536 1983-03-31 1984-03-30 Verfahren zum Einwalzen von Rippen in Rohre Expired EP0123923B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL241323 1983-03-31
PL24132383A PL139848B1 (en) 1983-03-31 1983-03-31 Method of pressing of fins on pipes

Publications (2)

Publication Number Publication Date
EP0123923A1 EP0123923A1 (de) 1984-11-07
EP0123923B1 true EP0123923B1 (de) 1986-09-03

Family

ID=20016488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840103536 Expired EP0123923B1 (de) 1983-03-31 1984-03-30 Verfahren zum Einwalzen von Rippen in Rohre

Country Status (5)

Country Link
EP (1) EP0123923B1 (de)
CS (1) CS247175B2 (de)
DE (1) DE3460598D1 (de)
HU (1) HU192046B (de)
PL (1) PL139848B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL139850B1 (en) * 1983-04-23 1987-02-28 Zakl Urzadzen Chem Metalchem Method of drawing of fins on bimetal pipes
CA1247592A (en) * 1983-08-04 1988-12-28 James L. Cunningham Finned heat exchanger tubes and method and apparatus for making same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463997A (en) * 1944-06-19 1949-03-08 Calumet And Hecla Cons Copper Method of making integral external and internal finned tubing
US2508517A (en) * 1945-10-01 1950-05-23 Calumet And Hecla Cons Copper Method of forming integral fins on tubing
US3881342A (en) * 1972-07-14 1975-05-06 Universal Oil Prod Co Method of making integral finned tube for submerged boiling applications having special o.d. and/or i.d. enhancement
US3868754A (en) * 1973-09-21 1975-03-04 Hatsuo Kawano Method of manufacturing a finned-tube heat exchanger
US4353234A (en) * 1977-07-13 1982-10-12 Carrier Corporation Heat transfer surface and method of manufacture

Also Published As

Publication number Publication date
DE3460598D1 (en) 1986-10-09
PL139848B1 (en) 1987-02-28
HU192046B (en) 1987-05-28
HUT38068A (en) 1986-04-28
CS247175B2 (en) 1986-12-18
PL241323A1 (en) 1984-10-08
EP0123923A1 (de) 1984-11-07

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