US3722247A - Corrugation of thin sheet - Google Patents

Corrugation of thin sheet Download PDF

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Publication number
US3722247A
US3722247A US00131048A US3722247DA US3722247A US 3722247 A US3722247 A US 3722247A US 00131048 A US00131048 A US 00131048A US 3722247D A US3722247D A US 3722247DA US 3722247 A US3722247 A US 3722247A
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US
United States
Prior art keywords
corrugation
work station
shell
rolls
sheet
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
Application number
US00131048A
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English (en)
Inventor
G Rouyer
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.)
Airbus Group SAS
Original Assignee
Airbus Group SAS
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Filing date
Publication date
Application filed by Airbus Group SAS filed Critical Airbus Group SAS
Application granted granted Critical
Publication of US3722247A publication Critical patent/US3722247A/en
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    • 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
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
    • B21D13/045—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling the corrugations being parallel to the feeding movement

Definitions

  • ABSTRACT A machine for corrugating thin sheet metal compris- [30] Foreign Application Priority Data ing two rolls at a first work station, at least two rolls at a second work station, tracking lateral rollers, a corru- Apr.
  • the trough of the head corrugation, formed thus in the first rake imprint, returns after a full revolution of the shell into the second rake imprint and accordingly follows a helical path by a process of continuous screwing into the rake.
  • the present invention accordingly provides a method of corrugating by means of two work-stations, the first of which forms the first half-corrugation by drawing in the metal needed to form a half-pitch, and the other bends the metal in the opposite direction to form the other half-pitch and thereby complete the head corrugation, the latter then engaging into the helix pitch of the rake of the first work station whereby to fully assure the high precision required in the geometry of the corrugating process.
  • FIG. 1 is a perspective view of a machine according to the invention for corrugating shells of thin sheet metal
  • FIG. 2 is a sketch illustrating the prior art method of forming corrugated sheets, corrugation by corrugation
  • FIG. 3 is a sketch illustrating the method according to this invention of forming corrugated sheets in successive half-corrugations at two work stations.
  • FIG. 4 shows a sheet undergoing corrugation.
  • FIG. 1 shows a shell 1 of smooth thin sheet to be corrugated placed between two sets of rolls 2,3 and 4,5.
  • the rolls 2 and 3 of the first work station carry roller supporting rakes 6 and 7 (the rake 7 not being visible).
  • the rolls 4 and 5 carry rakes 8 and 9 (rake 9 not being visible).
  • Endless shell 1 is welded back upon itself at 11, and visible at 12 and 13 are the lateral ofi'sets which, through the agency of tracking rolls, determine the degree of skew of the helical troughs 14.
  • FIG. 4 shows the formation of a bulge 15 at the point of initiation of the head corrugation 16.
  • the same figure shows a shell in the process of being corrugated, the set of rollers having been omitted in order to show certain particularities of the method with greater clarity.
  • the shell 1 is driven in the direction of arrow f1 by rolls 2 and 4 rotating in the direction of arrow f2 and rolls 3 and 5 rotating in the direction of arrow f3.
  • the region 21 of the sheet is level with apex 22 of trough 18.
  • the effect of roller 20 at the first work station is to shape a half-corrugation by bending the sheet in the direction of arrow f4 (rightwardly of FIG. 1).
  • the first roller of rake 9 bends the Sheet in the direction of arrow f5 (leftwardly of FIG. 1)
  • FIGS. 2 and 3 Reference will now be made to FIGS. 2 and 3 for a clearer understanding of the mechanism of the invention.
  • FIG. 2 shows in section along II-lI of FIG. 1 the rakes 6 and 7 of a single prior art work station.
  • each revolution of shell 1 causes the trough helix to advance by one pitch.
  • the graph 24 represents the formation of the full corrugation in the first turn taken from offset 13. It will be noted that all the smooth sheet required to form the corrugation is drawn in abruptly, thus causing cumulative elongation and internal stresses, which certain metals will withstand especially if the sheet is relatively thick.
  • the graph 25 represents the profile of the corrugation after a full revolution of the shell, and the graph 26 after two revolutions.
  • FIG. 3 on the contrary, may be seen the rakes 6 and 7 of the first work station of rolls 2 and 3, in accordance with the present invention.
  • Graph 27 shows what happens when the first roller 20 engages with the offset 13 in the shell and how it forms half-corrugation 28 by bending the sheet downwardly in the direction of arrow f4.
  • roller 20' of rake 9 mounted on roll 5 bends the sheet upwards once more in the direction of arrow f5 to form half-corrugation 29 and thereby complete the trough 18 of the first turn in helix 14.
  • Stage 24 in the formation of the first trough is thus effected in two phases and the metal is bent without cumulative elongation and crowding in an entirely rational manner in order to avoid any permanent set from the metallurgical standpoint.
  • roller 20 forms the half-trough 31, and thereafter the roller 20' of rake 9 completes the trough 23 which can be seen in the process of formation in FIG. 1, behind the bulges 17 and 17.
  • Stage 25 is accordingly completed and at the next revolution the two consecutive work stations perform the stage 26' in the same way.
  • the method of producing successive half-corrugations permits of adjusting with extreme precision the process of drawing in the metal of the smooth shell to be corrugated.
  • the work effected by the rollers, which exert virtually no distortion on the sheet is not accompanied by any notable surface wear, which, without the need to touch up the bearing surfaces, makes it possible to guarantee on the corrugated sheet the high precision of to within one-hundredth of a millimeter in respect of pitch and corrugation depth, and to within a few minutes of arc in respect of angles, which precision is essential for the subsequent fabrication and use of sandwich panels.
  • a method of corrugating sheet metal bent to form an endless shell characterized in that it includes the steps of welding upon itself a thin sheet to be corrugated; staggering the welded end edges by providing a degree of offset therebetween; positioning the shell on a cylindrical support between two sets of rolls of two work stations; causing the shell to rotate, the first roller of a rake mounted on one of the rolls of the first work station producing the bending into a half-corrugation upon said offset by pressing against a roller provided on the other roll of the first work station; effecting a bending in the opposite direction to form the second halfcorrugation of the first turn in a helical corrugation by means of two sets of rollers provided at the second work station; engaging, upon the second revolution of said support, said first turn into a second imprint of the first work station and obtaining therebya continuous helical corrugation without exceeding an elongation of 2 percent at any point in the metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Tires In General (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Tyre Moulding (AREA)
US00131048A 1970-04-08 1971-04-05 Corrugation of thin sheet Expired - Lifetime US3722247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR707012767A FR2085315B1 (enrdf_load_stackoverflow) 1970-04-08 1970-04-08

Publications (1)

Publication Number Publication Date
US3722247A true US3722247A (en) 1973-03-27

Family

ID=9053651

Family Applications (1)

Application Number Title Priority Date Filing Date
US00131048A Expired - Lifetime US3722247A (en) 1970-04-08 1971-04-05 Corrugation of thin sheet

Country Status (4)

Country Link
US (1) US3722247A (enrdf_load_stackoverflow)
DE (1) DE2117402C3 (enrdf_load_stackoverflow)
FR (1) FR2085315B1 (enrdf_load_stackoverflow)
GB (1) GB1317114A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021118837A1 (en) 2019-12-11 2021-06-17 Dow Silicones Corporation Rapid hydrosilylation cure composition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19536817B4 (de) * 1995-10-02 2008-11-06 Profiroll Technologies Gmbh Profilwalzwerkzeug zum profilierenden Kaltwalzen der Mantelfläche eines Werkstückes, insbesondere eines dünnwandigen Hohlteils

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940502A (en) * 1955-01-03 1960-06-14 Chance Vought Aircraft Inc Method and apparatus for deep beading thin gauge metal
US3067707A (en) * 1957-03-18 1962-12-11 Floyd P Ellzey Apparatus for making spirally wrapped multi-layer body construction
US3183695A (en) * 1961-07-31 1965-05-18 Republic Steel Corp Apparatus and process for producing perforated, corrugated, spiral, lock-seam pipe
US3548623A (en) * 1968-07-26 1970-12-22 Grotnes Machine Works Inc Method and apparatus for forming circumferential grooves and radial flange in metal pipe ends

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750985A (en) * 1953-02-06 1956-06-19 William A Scully Apparatus for convoluting thin walled articles
FR1391036A (fr) * 1964-01-14 1965-03-05 Nord Aviat Procédé de plissage de matériaux en feuilles et machine pour sa mise en oeuvre
FR1389125A (fr) * 1964-02-26 1965-02-12 Rohr Corp Presse à étamper des ondulations, particulièrement sur un ruban métallique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940502A (en) * 1955-01-03 1960-06-14 Chance Vought Aircraft Inc Method and apparatus for deep beading thin gauge metal
US3067707A (en) * 1957-03-18 1962-12-11 Floyd P Ellzey Apparatus for making spirally wrapped multi-layer body construction
US3183695A (en) * 1961-07-31 1965-05-18 Republic Steel Corp Apparatus and process for producing perforated, corrugated, spiral, lock-seam pipe
US3548623A (en) * 1968-07-26 1970-12-22 Grotnes Machine Works Inc Method and apparatus for forming circumferential grooves and radial flange in metal pipe ends

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021118837A1 (en) 2019-12-11 2021-06-17 Dow Silicones Corporation Rapid hydrosilylation cure composition
US11492449B1 (en) 2019-12-11 2022-11-08 Dow Silicones Corporation Rapid hydrosilylation cure composition

Also Published As

Publication number Publication date
GB1317114A (en) 1973-05-16
DE2117402A1 (de) 1971-10-28
FR2085315B1 (enrdf_load_stackoverflow) 1973-07-13
FR2085315A1 (enrdf_load_stackoverflow) 1971-12-24
DE2117402C3 (de) 1975-08-28
DE2117402B2 (de) 1975-01-23

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