US3859832A - Corrugated sheet material - Google Patents
Corrugated sheet material Download PDFInfo
- Publication number
- US3859832A US3859832A US368216A US36821673A US3859832A US 3859832 A US3859832 A US 3859832A US 368216 A US368216 A US 368216A US 36821673 A US36821673 A US 36821673A US 3859832 A US3859832 A US 3859832A
- Authority
- US
- United States
- Prior art keywords
- corrugations
- strip
- ridges
- counter
- grooves
- 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
Links
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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
- 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
-
- 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
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/126—Supply, or operations combined with supply, of strip material
Definitions
- ABSTRACT This invention relates to manufacturing corrugated sheet or strip from thin material.
- the original material has imparted thereto a series of corrugations which are coarser and wider than those finally required: at least one smaller counter-corrugation is impressed in the crest of each of the wider corrugations, and these counter-corrugations are deepened until all the corrugations resulting from this deepening are of substantially the same height.
- the material can be pressed together sideways to assist in the corrugating action and the invention enables the corrugations to be produced without any stretch in the material.
- the invention also includes a method of forming a tube which comprises taking the corrugated strip formed as above and coiling it around a mandrel in such a fashion that successive convolutions overlap preceding convolutions by approximately half the width of the strip: this produces a tube having a double wall thickness.
- the invention also provides apparatus for carrying out the above methods.
- the present invention relates to a method of and apparatus for manufacturing thin corrugated sheet or strip, in particular a strip of sheet metal for use, for example, for manufacturing a corrugated tube by coiling the strip in spiral fashion.
- the strips are covered on the inside and outside with strips of paper. Depending on the field in which the tubes are used, these strips of paper have then to be removed from the tubes, which requires an additional and laborious operation.
- This known method is not only laborious, without at the same time offering absolute freedom from gashing and splitting, but also has the disadvantage that, despite its complication and expense, it is only suitable for producing tubes of a certain minimum wall-thickness.
- Particularly thin sheet metal cannot therefore be handled by this known method. It is, however, desirable to handle such particularly thin sheets, especially when manufacturing flexible, multilayer tubes by coiling strips in a spiral with the edges of the strips overlapping.
- An object of the invention is therefore a method of and apparatus for manufacturing a thin corrugated sheet or strip, in particular a strip of sheet metal for producing a corrugated tube by coiling the strip in a spiral, in which or by means of which even brittle and hard sheet metal or relatively thin sheet metal can be corrugated in the way required substantially without gashing and tearing occurring when this is done, and without the sheet metal having to be covered on one or both sides with anti-friction layers, such as paper or the like.
- This object is achieved according to the invention by firstly producing a corrugation in a flat sheet which is coarser and wider than the final corrugation required in the sheet, by then impressing, at least, one smaller counter-corrugation in the crests of these large corrugations, and by deepening these counter-corrugations until all the corrugations are equal in height.
- the developed dimensions of the large corrugations are such that they correspond to the sum of the developed dimensions of the plurality of small corrugations of the required size to be formed from these large corrugations, since the method according to the invention is remarkable in that the impressing and/or deepening of the counter-corrugations takes place without the material forming the strip of sheet metal being stretched.
- the procedure for forming the coarse corrugation required at the beginning may consist in that the flat sheet is firstly formed with wide and, if desired, shallow corrugations which, gradually or in increments, are made narrower and possibly deeper by closing up the corrugations by applying sideways pressure on the material. After the counter-corrugations have been impressed and deepened, all the corrugations in the sheet, once having been brought to the same height, can be compressed sideways to form the final desired shape of corrugation by further closing up of the corrugations, so that the sides of the corrugations extend substantially or almost at right angles to a tangent to the crests of the corrugations.
- An apparatus which is particularly suitable for putting the method according to the invention into effect consists of a set of pairs of forming rollers positioned in succession in the direction of movement of the sheet or strip and having inter-engaging ridges and grooves situated between them, the ridges and grooves of the forming rollers first encountered in the direction of movement being of a size corresponding to the first coarse and wide corrugation to be produced in the sheet, and the forming rollers situated after them in the direction of movement having in the crests of their ridges and grooves, which are of similar size, smaller counter-grooves or counter-ridges which are intended to impress the counter-corrugations into the coarse corrugation.
- FIG. II shows such apparatus in plan view
- FIG. 2 shows this apparatus from the side
- FIG. 3 shows, schematically, the various steps in the corrugating process according to the invention to be performed with this apparatus
- FIG. 4 shows, to an enlarged scale, a section through the corrugated wall of a corrugated tube produced using the apparatus of FIGS. 1 and 2, and
- FIG. 5 is a partial section, to an enlarged scale, through one pair of the forming rollers associated with the apparatus shown in FIGS. 1 and 2.
- the apparatus shown in FIGS. 1 and 2 has five mutually adjacent pairs of forming rollers I to 5 with the rollers situated one above another, the rollers being driven by a driveassembly of any desired kind, mounted in a housing 6.
- the strip of sheet metal 7 to be corrugated is drawn from a roll 8 and is passed through each pair of forming rollers in succession. As it is passed through the pairs of opposing forming rollers l to 5, the strip of sheet metal 7 undergoes the corrugation process described in detail below.
- the strip of sheet metal After the strip of sheet metal has been corrugated, it is coiled onto a winding mandrel 9 which is arranged diagonally to the longitudinal direction of the strip in such a way, in the case of the embodiment shown, that the spirally wound coil of strip overlaps by half its width at any given point.
- FIG. 3 of the drawings the stages of deformation are shown schematically underneath one another in a diagrammatic position.
- the straight line marked in the diagram is a schematic representation of the cross-section of the strip of sheet metal 7 immediately after it has been uncoiled from the roll 8 and prior to its first deformation.
- the line marked I shows the strip of sheet metal after its first deformation, which it receives from the first pair of rollers 1. In the course of this first deformation the strip of sheet metal receives wide and relatively gentle corrugations.
- the second pair of rollers 2 makes the wide and gentle corrugations shown by line I narrower by closing up the corrugations by applying sideways pressure to the strip of sheet metal 7.
- the cross-section of the strip of sheet metal subsequent to this stage of deformation is shown in FIG. 3 by line II.
- the next pair of rollers 3 make an impression in the crests of the deep and now relatively steep-flanked corrugations, which have been narrowed, in such a way that small counter-corrugations 11 are produced in the area of each of the crests of the corrugations.
- the strip of sheet metal now has the cross-section shown by line III in FIG. 3.
- the width of the counter-corrugations l1 usefully amounts to approximately a third or less than a third of the width of the deep, narrowed corrugations, while the depth of the counter-corrugations should be less than a third of the depth of the deep corrugations.
- the small counter-corrugations 11 are deepened by reducing the depth of the deep corrugations formed by pair of rollers 2, so that the strip of sheet metal receives the crosssectional shape shown by line IV.
- the deepened counter-corrugations 11 are again deepened as the strip of sheet metal passes between the pair of forming rollers 5 to such an extend that the countercorrugations and the parts of the coarse corrugations remaining between them are of equal height.
- the crosssection of the strip resulting from this is shown by line V in FIG. 3.
- the forming rollers of the first pair 1 have at their periphery interengaging ridges with grooves situated between them which correspond in size to the coarse corrugation shown by line 1 in FIG. 3 which is to be initially produced in the sheet, while the profile of the periphery of the forming rollers of the next pair 2 is so formed with ridges and grooves that the narrowed and steeper deep corrugations shown by line II in FIG. 3 result from those corrugations being closed up sideways.
- rollers in the next pairs of rollers 3, 4 and 5 are so profiled at the periphery that the counter-corrugations 11 are produced by them and are deepened in two successive stages in such a way that the cross-sections shown by lines III, IV and V in FIG. 3 are produced in the strip, in succession.
- the ridges and grooves are all of the same size and the same height.
- FIGS. 1 and 2 For the sake of clarity and simplicity, the forming rollers are shown in FIGS. 1 and 2 without the requisite contouring on their periphery.
- FIG. 5 a cross-section is shown through the peripheral region of rollers 3, which give the strip of sheet metal 7 the crosssectional shape shown schematically by line III in FIG. 3.
- This cross-section through the rollers shows how the two cooperating forming rollers inter-engage at their periphery so that the counter-corrugations II are impressed in the areas of the crests of the relatively deep and steep-flanked corrugations in the strip of sheet metal.
- the strip of sheet metal which has been provided with its final corrugations is next coiled onto the winding mandrel 9, the axis of rotation of which extends diagonally to the longitudinal direction of the strip, in the way described above such that the corrugations at the overlapping edges of the successive coils of the strip rest in one another as shown by the cross-section (FIG. 4 of the drawings) through the wall of the corrugated tube which is to be produced.
- the first convolution of the corrugated tube built up by coiling the corrugated strip of sheet metal 7 in a spiral is marked 12 in FIG. 4.
- the next convolution l3 overlaps this first coil 12 by approximately half its width.
- the edge of convolution 14, which follows convolution 13, is situated in approximately the same area as the edge of the preceding convolution 12 which overlaps convolution 13, the two convolutions 13 and 14 also overlapping one another by approximately half their width.
- Convolution l4 overlaps convolution 15 in the same way. Therefore, when the corrugated strip of sheet metal 7 is coiled onto the winding mandrel 9, a corrugated tube is produced which consists of two layers of corrugated sheet metal, except at its first and last coil, as a result of which the two layers of sheet metal making up the tube can be of very small thickness without prejudicing the resistance of the tube to buckling. When combined with the small thickness of sheet which may be used, the double-walled nature of the corrugated tube enables the tube to be extraordinarily flexible.
- the method according to the invention described in association with the apparatus shown in the drawings may, if desired, be elaborated in respect of the number of stages of deformation.
- the flat strip of sheet metal 7 may first of all be given a less deep corrugation than that shown for the coarse corrugation line 1 in FIG. 3. These shallow corrugations can then be deepened so that the strip receives the coarse corrugation shown by line 1 in FIG. 3.
- a method of manufacturing a thin, corrugated sheet or strip comprising the steps of (a) taking a flat sheet of material, (b) imparting to said sheet a series of corrugations which are coarser and wider than the corrugations finally required, (c) impressing at least one smaller counter-corrugation in the crest of each of said wide corrugations and (d) deepening said countercorrugations until all the corrugations are of substantially the same height.
- said coarse and wide corrugation formed initially is produced by first of all giving said sheet or strip broad and shallow corrugations which are deepened, gradually or by increments, by closing up and narrowing said corrugations.
- Apparatus for forming a corrugated sheet or strip comprising a set of pairs of forming rollers, movement means for moving said sheet or strip through said rollers, said pairs being positioned in succession in the direction of movement of said sheet or strip and each pair having inter-engaging ridges and grooves situated between them, with the ridges and grooves of the forming rollers first encountered in the direction of movement corresponding in size to a first coarse or'wide corrugation to be produced in said sheet or strip, and the forming rollers situated after them in the direction of movement having smaller counter-grooves or ridges in the crests of their grooves and ridges which impress counter-currugations into said coarse corrugations, the width of said counter-ridges and counterridges and counter-grooves being approximately a third of that of the ridges and grooves on the preceding forming rollers for producing said coarse and wide corrugations, and the height of said counter-ridges and grooves being less than a third of the height of the ridges and groove
- Apparatus for forming a corrugated sheet or strip comprising a set of pairs of forming rollers, movement means for moving said sheet or strip through said rollers, said pairs being positioned in succession in the direction of movement of said sheet or strip and each pair having inter-engaging ridges and grooves situated between them, with the ridges and grooves of the forming rollers first encountered in the direction of movement corresponding in size to a first coarse or wide corrugation to be produced in said sheet or strip, and the forming rollers situated after them in the direction of move ment having smaller counter-grooves or ridges in the crests of their grooves and ridges which impress counter-corrugations into said coarse corrugations, said pairs of forming rollers for impressing the countercorrugations being followed by pairs of forming rollers which have ridges and grooves of the same size and height.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2228496A DE2228496C2 (de) | 1972-06-12 | 1972-06-12 | Verfahren zur Wellung eines dünnen, ebenen Bleches |
Publications (1)
Publication Number | Publication Date |
---|---|
US3859832A true US3859832A (en) | 1975-01-14 |
Family
ID=5847497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US368216A Expired - Lifetime US3859832A (en) | 1972-06-12 | 1973-06-08 | Corrugated sheet material |
Country Status (10)
Country | Link |
---|---|
US (1) | US3859832A (it) |
JP (1) | JPS5135548B2 (it) |
AT (1) | AT323526B (it) |
BE (1) | BE800793A (it) |
CH (1) | CH554200A (it) |
DE (1) | DE2228496C2 (it) |
FR (1) | FR2187446B1 (it) |
GB (1) | GB1425615A (it) |
IT (1) | IT986424B (it) |
NL (1) | NL7307839A (it) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4689261A (en) * | 1983-10-05 | 1987-08-25 | Ahnstroem Ove | Rounded corrugated sheet and method and apparatus for its manufacture |
US20090263598A1 (en) * | 2006-08-31 | 2009-10-22 | Luvata Oy | Method for producing a metal tube by clad rolling one more profiles to form at least one channel, a clad rolling mill for joining one or more profiles, a clad rolled metal tube |
US20100009126A1 (en) * | 2008-07-12 | 2010-01-14 | The Boeing Company | Method and Apparatus for Forming a Corrugated Web Having a Continuously Varying Shape |
US20100006700A1 (en) * | 2008-07-12 | 2010-01-14 | The Boeing Company | Aircraft wings having continuously tailored structural strength |
US8028557B2 (en) | 2004-09-08 | 2011-10-04 | The Bradbury Company, Inc. | Methods and apparatus for forming stiffening structures in a strip material |
US20150045198A1 (en) * | 2011-10-28 | 2015-02-12 | Rutgers, The State University Of New Jersey | Method and apparatus for microfolding sheet materials |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2801330B2 (de) * | 1978-01-13 | 1981-04-30 | Ernst 4050 Mönchengladbach Sakanek | Metallschlauch |
DE3424658C2 (de) * | 1984-07-02 | 1986-11-13 | Mannesmann AG, 4000 Düsseldorf | Wärmeübertragungsrohr, insbesondere Wärmerohr, und Verfahren zum Herstellen desselben |
CN107150079A (zh) * | 2017-05-18 | 2017-09-12 | 安岩晨 | 金属矩形圆角/非圆角直条波辊压装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1056871A (en) * | 1912-02-13 | 1913-03-25 | Gen Fireproofing Co | Process for making ribbed sheet metal. |
US3690137A (en) * | 1969-06-20 | 1972-09-12 | Cookson Sheet Metal Dev Ltd | Roll forming of sheet metal |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2513777A (en) * | 1947-12-09 | 1950-07-04 | Chrysler Corp | Apparatus for sinuous contoured material |
FR1467532A (fr) * | 1966-02-07 | 1967-01-27 | Dispositif pour fabriquer de la tôle ondulée |
-
1972
- 1972-06-12 DE DE2228496A patent/DE2228496C2/de not_active Expired
-
1973
- 1973-05-29 CH CH775973A patent/CH554200A/xx not_active IP Right Cessation
- 1973-05-29 AT AT467373A patent/AT323526B/de not_active IP Right Cessation
- 1973-05-31 GB GB2607073A patent/GB1425615A/en not_active Expired
- 1973-06-05 NL NL7307839A patent/NL7307839A/xx active Search and Examination
- 1973-06-06 IT IT68676/73A patent/IT986424B/it active
- 1973-06-08 US US368216A patent/US3859832A/en not_active Expired - Lifetime
- 1973-06-12 FR FR7321277A patent/FR2187446B1/fr not_active Expired
- 1973-06-12 BE BE132165A patent/BE800793A/xx unknown
- 1973-06-12 JP JP48065504A patent/JPS5135548B2/ja not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1056871A (en) * | 1912-02-13 | 1913-03-25 | Gen Fireproofing Co | Process for making ribbed sheet metal. |
US3690137A (en) * | 1969-06-20 | 1972-09-12 | Cookson Sheet Metal Dev Ltd | Roll forming of sheet metal |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4689261A (en) * | 1983-10-05 | 1987-08-25 | Ahnstroem Ove | Rounded corrugated sheet and method and apparatus for its manufacture |
US8028557B2 (en) | 2004-09-08 | 2011-10-04 | The Bradbury Company, Inc. | Methods and apparatus for forming stiffening structures in a strip material |
US20090263598A1 (en) * | 2006-08-31 | 2009-10-22 | Luvata Oy | Method for producing a metal tube by clad rolling one more profiles to form at least one channel, a clad rolling mill for joining one or more profiles, a clad rolled metal tube |
US20120097732A1 (en) * | 2006-08-31 | 2012-04-26 | Luvata Oy | Clad rolling mill for joining one or more profiles |
US20100009126A1 (en) * | 2008-07-12 | 2010-01-14 | The Boeing Company | Method and Apparatus for Forming a Corrugated Web Having a Continuously Varying Shape |
US20100006700A1 (en) * | 2008-07-12 | 2010-01-14 | The Boeing Company | Aircraft wings having continuously tailored structural strength |
US8292227B2 (en) | 2008-07-12 | 2012-10-23 | The Boeing Company | Aircraft wings having continuously tailored structural strength |
US8402805B2 (en) * | 2008-07-12 | 2013-03-26 | The Boeing Company | Method and apparatus for forming a corrugated web having a continuously varying shape |
US20150045198A1 (en) * | 2011-10-28 | 2015-02-12 | Rutgers, The State University Of New Jersey | Method and apparatus for microfolding sheet materials |
WO2013063551A3 (en) * | 2011-10-28 | 2015-06-18 | Rutgers, The State University Of New Jersey | Method and apparatus for microfolding sheet materials |
Also Published As
Publication number | Publication date |
---|---|
DE2228496A1 (de) | 1974-01-03 |
NL7307839A (it) | 1973-12-14 |
IT986424B (it) | 1975-01-30 |
AT323526B (de) | 1975-07-10 |
JPS5135548B2 (it) | 1976-10-02 |
CH554200A (de) | 1974-09-30 |
FR2187446B1 (it) | 1980-04-30 |
BE800793A (fr) | 1973-10-01 |
GB1425615A (en) | 1976-02-18 |
FR2187446A1 (it) | 1974-01-18 |
DE2228496C2 (de) | 1982-07-08 |
JPS4963642A (it) | 1974-06-20 |
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