Abstract: A roll stamping apparatus includes sets of rollers that rotate while facing each other so as to press opposite surfaces of a material which is continuously supplied to move between the rollers. The sets of rollers have molding portions with a stamping structure applied to outer surfaces so as to mold the material, wherein a plurality of sets of rollers are disposed along a movement direction of the material, the respective molding portions of the sets of rollers are formed to sequentially change a cross section of the material along the movement of the material, and the molding portion of at least one set of rollers before a final set of rollers through which the material finally passes is a set of over-molding rollers having a length in a circumferential direction longer than the molding portions of the final set of rollers.

Abstract: An apparatus and method are disclosed for the automated manufacture of a duct flange profile to make small duct fittings, including a transverse duct flange duct flange profile. The duct flange profile is directed to small part duct fittings with section widths up to about 16 inches in 20 to 26 gauge metal. The apparatus includes a bending head assembly having a drive roller, a pressure roller, an anvil and a bending leaf and a roll form assembly.

Abstract: Disclosed is an example of a method of manufacturing a pressed product including a substantially U-shaped main body and an undercut flange situated in the main body, in which an angle modification process can be eliminated. In the disclosed method, a third bent part, which is situated away from a first bent part towards a second bent part on a metallic sheet by a first length or more, is bent such that the first bent part is moved towards a first press direction and the undercut flange is moved towards a second press direction. The first press direction and the second press direction are opposite to each other. The first length is a length from a boundary between the undercut flange and a first plate portion to a tip of the undercut flange sized by projecting the undercut flange on an imaginary surface orthogonal to the first plate portion.

Abstract: A metal roof panel includes a rib with a unique shape. The rib is bilateral with upwardly angled sides that each transition into an indentation, with both indentations transitioning into a central flat apex. Between each rib is a channel, preferably including at least one raised surface. The lower surface of the channel between the raised surfaces, and the top of the raised surfaces, are substantially planar and parallel to the flat surface of the apex of the panel. A unique method of manufacturing the roof panel employs a roll machine configured to shape a piece of sheet metal into the roof panel by modifying the shape in many small increments, which allows the final product to have a fairly intricate bend pattern.

Abstract: A method for forming a longitudinal bend in a strap in a strapping machine by forming a pre-bend in the strap between a first wheel and a second wheel having cooperating, non-planar strap contact surfaces and subsequently forming the longitudinal bend in the strap between the second wheel and a third wheel having cooperating non-planar strap contact surfaces.

Abstract: A cold rolling method for manufacturing a profile (16) from a one-piece rolling stock in form of initial material (6; 56) with a plurality of rolls (26, 36, 46; 6, 76, 86) each having a deforming region (28, 38, 48; 68, 78, 88) for deforming the initial material (6; 56) includes bending the initial material (6; 56) with formation at least one folded section (8) extending in a rolling direction of the initial material (6; 56), and deforming the initial material (6; 56) in its width direction with reduction of its thickness at least in one region.

Abstract: A roll former has a plurality of paired die assemblies spaced apart across a midline of the roll former, and a web of material is fed through the roll former along the midline for operations by the die assemblies. The spacing between each pair of die assemblies is uniformly adjustable by way of mounting the die assemblies on collector plates movable toward and away from each other by linear actuators such as jack screws. Smoothness of movement is enhanced by supporting the collector plates only on the linear actuators. Precision of positioning is enhanced by using jack screws as the linear actuators.

Abstract: A roll-forming machine for forming smooth curves in profiled panel sections. The roll forming machine has opposed pinch pass rollers having a roller profile generally corresponding to said profiled panel and a pair of cantilever rollers downstream of said pinch pass rollers. The cantilever rollers have axes of rotation that are offset relative to one another in the direction of travel of the profiled panel through the machine and having a roller profile also generally corresponding to the profiled panel. At least one sweep roller is positioned downstream of the cantilever rollers for bending said panel in a longitudinal direction as said panel passes past said sweep roller. The sweep roller also has a roller profile generally corresponding to the profiled panel. The at least one sweep roller can be positioned to the degree of bend of the smooth curve formed in said profiled panel by the machine.

Abstract: An apparatus for bending sheet metal comprises a housing, a first shaft and second mounted in the housing, a motor, a first gear mounted on the first shaft, and a second gear mounted on the second shaft. The motor rotates both the first gear and the second gear. The first gear and comprises a first plurality of components and the second gear comprises a second plurality of components. The first gear and the second gear are capable of engaging sheet metal passed between the gears while they are moving. The first and second plurality of components are capable of being configured to change a bend radius, a wavelength of waves formed in the sheet metal, and a distance between the first shaft and the second shaft can be adjusted to change an amplitude of waves formed in the sheet metal engaged by the first and second gears.

Abstract: A pipe manufacturing system and method for producing helically corrugated metal pipe is provided. The system and method utilize controlled profile formation.

Abstract: The configuration comprises a shaping member 3 having a substantially rectangular shape and shaping the inner surface side of a bent portion 1b, a worm gear 2 slidably linked with the shaping member 3 and gradually reducing the distance between the shaping members 3 for sequentially feeding the shaping member 3 from one side to the other side, and a reference member 4 arranged so that the upper end surface of the bent portion 1b comes into contact with its reference surface, and the distance between the shaping members 3 is gradually reduced to a predetermined fin pitch and the upper end surface of the bent portion 1b is shaped into a predetermined shape by rotating the worm gear 2 after the plurality of bent portions 1b are arranged at the shaping members 3. Due to this, it is possible to shape the bent portion into a continuous and stable shape.

Abstract: A V-shaped metal strip has a U-shaped bottom having U-shaped inside and outside surfaces. Only the U-shaped inside surface is formed with a plurality of fold lines extending in a longitudinal direction of the strip and reducing the influence of springback. The fold lines may be arranged in a manner of bilateral symmetry with respect to an imaginary median plane bisecting the V-shaped cross section of the metal strip.

Abstract: The present invention enables to firmly assemble a steel-frame structure. To form a steel-frame structure or to join two steel members being reinforcing members thereof, a slip-proof surface having one or plural concentric higher parts and grooves is formed on the joined surface of one side or both sides of the steel members, and these two steel members are clamped by a connecting member that passes through connecting holes in the state where the first and the second slip-proof surfaces are mutually engaged or not engaged. Thus, joining force between the joined surfaces is increased.

Abstract: A tube and turbulator and method of making the same for a heat exchanger including a base, a top spaced from and opposing the base, a first side interposed between the base and the top along one side thereof, and a second side interposed between the base and the top along another side thereof. The base, top, first side and second side form a channel. The second side is triple hemmed such that ends of the base and the top are disposed within the channel. A flat turbulator may be disposed inside the tube and includes a base extending laterally and longitudinally in a strip. The flat turbulator also includes a plurality of corrugations spaced laterally along the base and extending longitudinally and generally perpendicular to the base in an alternating manner. The corrugations are rolled in a direction parallel to a longitudinal axis of the strip.

Abstract: An apparatus for manufacturing a roofing panel has been accomplished such that the desired panel version can be produced by altering the infeed point of the panel (6) on a feeding table (5). The apparatus can be utilized in the manufacture of roofing panels of various materials and with varied profile shapes.

Abstract: A tube and turbulator and method of making the same for a heat exchanger including a base, a top spaced from and opposing the base, a first side interposed between the base and the top along one side thereof, and a second side interposed between the base and the top along another side thereof. The base, top, first side and second side form a channel. The second side is triple hemmed such that ends of the base and the top are disposed within the channel. A flat turbulator may be disposed inside the tube and includes a base extending laterally and longitudinally in a strip. The flat turbulator also includes a plurality of corrugations spaced laterally along the base and extending longitudinally and generally perpendicular to the base in an alternating manner. The corrugations are rolled in a direction parallel to a longitudinal axis of the strip.

Abstract: A metallic corrugated plate applying to a cooling inner fin of a heat exchanger, wherein a bending angle .THETA. of an end bent ridge portion is smaller than bending angle .theta. of the other bent ridge portions. Thus, in case the bending angle .THETA. becomes large by a resilient force after forming the bent ridge portions, preventing a bending rigidity of the end bent ridge portion in the spreading direction from being reduced is possible. Accordingly, preventing the inner fin from being warped from substantially the center ridge of the bent ridge portion is attained.

Abstract: A metalworking iterative method of cold-working blanks into configurations having contiguously repeated predetermined forms wherein an advance-worked form functions to locate a succeeding form. A first portion of a blank is squeezed into a predetermined form in a forming position of a press. The predetermined form corresponds to one cycle of the reciprocal undulations of an undulated plate spring. The blank is then shifted in the feed direction of the press by a feed pitch corresponding to one undulation, thereby locating the worked first portion of the blank into a locating position of the press, meanwhile a pitch-length second portion is in the forming position. Accordingly, the accuracy of the succeeding press operation on the second portion in terms of its contiguous position relative to the worked first portion is secured.

Abstract: A roll forming device receives a continuous elongated flat sheet of metal to form selected profiles along at least one longitudinal margin thereof. The roll forming device comprises a drive assembly, located within the apparatus frame which engages the elongated sheet proximate to the entryway and advances the sheet in a downstream direction discharge it at an exit. Preferably, at least one guide bar is supported by the frame which also engages the longitudinal margin of the sheet as it is advanced downstream and bends it into a trough-shaped cross-section. The frame houses at least one forming station having a coacting pair of first and second forming rollers journaled for rotation about respective axes. Some of the forming stations may include a plurality of pairs of coacting first and second forming rollers, at least some of which are mounted to be adjustably positioned toward and apart from one another to accommodate varying widths of sheet metal.

Abstract: The strip 2 is inserted between forming rollers 1a and 1b so that fins 3 are formed on the strip 2. The forming rollers 1a 1b have a line of protrusion protruding radially on the periphery thereof and the protrusion of one roller mates with protrusion of the other roller. A pair of forming rollers or more pairs of forming rollers are employed. A part of the strip 2 sandwiched between side face portions 13a and 14a of the protrusion 13 and 14 is pressed in the direction of the thickness of the strip with a stress between yield stress and maximum stress of the strip 2. To adjust the stress, a clearance G between protrusions is controlled.

Abstract: A rolling mill comprising a plurality of roll passes for progressively forming a workpiece to a desired final cross-sectional shape wherein each roll pass comprises a pair of rotatable mountings, the mountings being disposed on opposite sides of a pass line of the mill, each rotatable mounting carrying at least two rolling means of different configuration to form the workpiece to a different final shape and rotation of the mountings permitting a selected rolling means of each mounting to be disposed, at a rolling position, on opposite sides of said pass line to engage and form the workpiece and wherein the mill has a drive means to rotate at least one rolling means of at least one of said roll passes when disposed in said rolling position.

Abstract: Hollow profile elements are formed by shaping a starting workpiece that consists of multiple layers of a material having a large width-to-thickness ratio, e.g., woven fabrics or laid materials. The layers are joined by seams to define elongated pockets or channels. Shaping tools are inserted into these channels to form the profile elements with a desired cross sectional shape, which can be constant or varied. The shaping tools employ one or more endless belts that extend in closed loops around guide rollers; the belts are driven so that during the shaping process sliding friction is substantially eliminated between the material of the workpiece and the respective shaping tool.

Abstract: A rolling mill comprising a plurality of roll passes for progressively forming a workpiece to a desired final cross-sectional shape wherein each roll pass comprises a pair of rotatable mountings, the mountings being disposed on opposite sides of a pass line of the mill, each rotatable mounting carrying at least two rolling means of different configuration to form the workpiece to a difference final shape and rotation of the mounting permitting a selected rolling means of each mounting to be disposed, at a rolling position, on opposite sides of said pass line to engage and form the workpiece and wherein the mill has a drive means to rotate at least one rolling means of at least one of said roll passes when disposed in said rolling position.

Abstract: An improved cold formed, sheet metal profiled building unit and method of making the same are disclosed. The building unit incorporates at least one longitudinal stiffening rib in a longitudinal flat region of the type having a tendency to buckle when subjected to compressive forces. The longitudinal stiffening rib is formed not by drawing-in sheet metal as in current roll forming practices, but, instead, by stretching a segment of the sheet metal. Each longitudinal rib has a profile width, as measured along the centerline of the rib, which is greater than the linear of the sheet metal segment from which it was stretched-in. Roll forming machines incorporating the principles of this invention utilize fewer roll stands than do roll forming machines incorporating the principles of current roll forming practices.

Abstract: A machine for corrugating sheet metal or the like comprises a plurality of successive working stations each provided with upper and lower rotatable corrugating devices adapted to jointly provide corrugations of successively increasing depth in a metal sheet (6) which is successively advanced through the machine from a front station toward a rear station. According to the invention, both the upper and the lower corrugating device at each station comprises a plurality of rollers (13, 16) which are individually mounted and thus rotatable at optionally variable peripheral speeds. The rollers (13, 16) preferably are adjustably movable in the direction of their axes of rotation and lockable at desired spaced-apart locations.

Abstract: A cold-forming method is disclosed for thinning localized, longitudinally extending portions of sheet metal by lateral shear deformation without any substantial longitudinal deformation. With such method, it is possible to produce elongated members which are thinned in zones of low stress and are thicker in zones of higher stress so as to provide high metal use efficiency. The method is performed by an apparatus including a rotating mandrel providing opposed conical surfaces and pressure rolls operable to apply forces substantially perpendicular to the axis of rotation of the mandrel to cause a portion of the sheet metal to yield in shear to reduce the thickness of longitudinally extending portions of the sheet metal. The forces are applied in a plane normal to the length of the strip in order to avoid longitudinal elongation.

Abstract: An improved cold formed, sheet metal profiled building unit and method of making the same are disclosed. The building unit incorporates at least one longitudinal stiffening rib in a longitudinal flat region of the type having a tendency to buckle when subjected to compressive forces. The longitudinal stiffening rib is formed not by drawing-in sheet metal as in current roll forming practices, but, instead, by stretching a segment of the sheet metal. Each longitudinal rib has a profile width, as measured along the centerline of the rib, which is greater than the linear of the sheet metal segment from which it was stretched-in. Roll forming machines incorporating the principles of this invention utilize fewer roll stands than do roll forming machines incorporating the principles of current roll forming practices.

Abstract: A machine for cutting a relatively wide sheet of material into a plurality of relatively narrow strips to reduce bowing and camber in the cut strips is disclosed. The machine supports and moves the material along a path defined through the machine. The material initially engages a first pair of furrowing disc sets disposed on opposites sides of the sheet, which form a plurality of shallow furrows in the sheet as it passes therebetween. The material next engages a pair of slitting disc sets, also disposed on opposite sides of the sheet, which cut the relatively wide sheet into a plurality of relatively narrow strips as it passes therebetween. The slitting disc sets also engage and firmly hold the sheet near the furrows during the cutting process. Lastly, the material engages a second pair of furrowing disc sets which also engage and firmly hold the sheet near the furrows during the cutting process.

Abstract: A drywall corner bead providing a rounded nose and two mounting flanges extending from opposite sides of the nose is formed from a strip of galvanized metal of uniform thickness. The two flanges are provided with three discrete longitudinally extending bands of reduced thickness formed by shear deformation of the material forming the band. The flanges are knurled to emboss the surface thereof and openings are formed in the flanges at intervals along their length. The corner bead is formed by a method in which shear deforming forces are progressively applied to the material forming the thinned bands to produce lateral deformation of such material without any appreciable lengthwise deformation. After the thinned bands are formed, forces are applied to straighten the corner bead. Subsequently, the flanges are knurled to provide an embossed surface and holes are punched in the flanges at intervals along their length.

Abstract: A machine for adjustable longitudinal corrugating of sheet materials, particularly of metal with stepwise folding/bending over free-running rollers and counter-rollers, so that alternating longitudinal convex and concave corrugations are formed. At each profiling step there are upward and downward forming rollers (47) which can be individually adjusted laterally to the direction of corrugation. Separate from the forming rollers there are at least one set of drive rollers (60) and counter-rollers (37) where both the drive rollers and the counter-rollers can be adjusted laterally to the direction of corrugation.

Abstract: The invention relates to a profiled sheet for building purposes, especially roofing and facade sheet, the sheet having a normal profiling and having in addition, at least in certain sections, a corrugated microprofiling deviating from the normal profiling. The microprofiling exhibits flattened and/or pressed-in areas in its crest, valley and/or flank sections resulting in that the thickness of the profiled sheet varies in a direction transversely of the longitudinal direction of the microprofiling which agrees with the longitudinal direction of the normal profiling. The flattened and/or pressed-in areas extend in the longitudinal direction of the microprofiling.

Abstract: Two rolls are supported laterally in bearings in two pairs of side-by-side members with the members being supported by a frame. Adjustment of synchronization and registration is accomplished by adjusting the relative positions of the side-by-side members in or against the rolling direction. The relative positions of the rolls can be adjusted by use of notches engraved in the ends of the rolls; and can be continuously monitored with the aid of a stroboscope light. Magnetic signal devices and other sensors are also suitable for monitoring. Continuous adjustment of roll position is accomplished through low-pitch screws or through hydraulic or electric positioning motors.

Abstract: A roll forming process is described wherein longitudinal areas of curvature are formed in strip material between longitudinal areas of narrower width, the areas of curvature being bowed downwardly from the center toward the longitudinal flat areas. As the strip material is fed progressively through roll forming stations, the longitudinal areas of curvature are formed into areas of lesser curvature and finally flattened to provide strip material having relative flat areas separated by substantially rectangular ribs. The process is one in which areas of curvature are provided to initially gather strip material for use in forming the sides of one or more ribs with little or no thinning of the strip material.

Abstract: A cold-forming method is disclosed for thinning localized, longitudinally extending portions of sheet metal by lateral shear deformation without any substantial longitudinal deformation. With such method, it is possible to produce elongated members which are thinned in zones of low stress and are thicker in zones of higher stress so as to provide high metal use efficiency. The method is performed by an apparatus including a rotating mandrel providing opposed conical surfaces and pressure rolls operable to apply forces substantially perpendicular to the axis of rotation of the mandrel to cause a portion of the sheet metal to yield in shear to reduce the thickness of longitudinally extending portions of the sheet metal. The forces are applied in a plane normal to the length of the strip in order to avoid longitudinal elongation.

Abstract: The present invention relates to rounded corrugated sheeting (4) whose profile exhibits crest portions (5), flanks (6), and bottom portions (7). The crest portions (5) are located on the concave side of the rounded sheet and are provided with grooves formed by pressing during rounding of the sheeting. The grooves form ribs (10) on the convex side of the sheet. In the rounding of the sheet, the material present in the crest-portions (5) of the sheet (4) is distributed in a manner which facilitates rounding and counteracts the formation of folds or wrinkles in the crest portions (5), and prevents other forms of damage.

Abstract: In a lightweight longitudinal angled section, particularly a cover-carrying profile, which includes two legs spaced from one another extending along the longitudinal direction, wherein a longitudinal bar connects the legs, and each leg is formed with stiffening devices, which, in turn, include at least one longitudinal impression, each leg has a free longitudinal end facing away from the bar, and wherein the free longitudinal end is formed with a longitudinal flange extending approximately parallel with the bar so as to face inwardly, the improvement includes longitudinal edge portions connecting respective legs to the bar, corrugations which extend transverse to the longitudinal direction along each leg up to the longitudinal impressions, and therebeyond to the longitudinal edge portions, and at least partly over a portion of the width of the bar, and wherein the corrugations are spaced from one another at substantially identical distances.

Abstract: To make vane airfoils for an axial flow compressor metal strip is first contour rolled to a cross section comprised of two opposing airfoils separated by a center rib, where one of the faces of the strip is kept planar. The rib is used to guide the strip into dies where it is notched and slotted to define individual airfoils. Next, die stamping makes concave the planar surface of each airfoil.

Abstract: Apparatus for forming a flat metal sheet into a panel having a central region of deep corrugations and a marginal edge which is either uncorrugated or has longitudinal or light traverse corrugations therein. A corrugation roll assembly forms the corrugated panel and a tension roll assembly pulls the panel through the corrugation roll assembly. A combination of cooperative corrugation roll sections and edge roll subassemblies are mounted on respective shafts with the edge roll subassembly providing a resilient gripping of an edge panel section in an angled channel region. This resilient gripping causes inward drawing of metal from the edge section into the corrugated central section to equalize the overall lengths of the respective sections.

Abstract: Forming rolls of a tube-producing apparatus comprise an upper roll having two identical roll parts supported at spaced-apart positions on a roll shaft, each roll part having a rounded outer circumferential working surface which, as viewed in section taken along a plane passing through the rotational axis of the roll, has a rounded convex profile shape of mutually different inner and outer radii of curvature on inner and outer sides of the profile centerline perpendicular to the axis, the working surface portion of the outer radius operating cooperatively with the outer portion of a lower roll to form the lateral portion of a strip metal plate passed therebetween. Each upper roll part can be turned around in orientation on the roll shaft to place the working surface of the originally inner radius on the outer side, thereby changing the gap between the upper and lower rolls to suit the wall thickness of the tube being produced.

Abstract: Starting sheets are straightened and stiffened in electrolytic refining plants by shaping the same predetermined areas of the starting sheet surfaces once or several times during successive shaping stages in such a manner that the elasticity range of the starting sheet material is at least in part exceeded. During each shaping stage depressions or grooves deviating from the plane of the starting sheet surface are produced in the starting sheets by shaping the said same areas of the starting sheet surface alternately from the opposite sides of the starting sheet during the different shaping stages, whereby the alternate shaping of the areas of the starting sheet surfaces from the opposite sides of the starting sheet straightens the starting sheet and causes work-hardening in the material of the starting sheet, and the depressions or grooves deviating from the plane of the starting sheet surface cause a stiffening of the starting sheet.

Abstract: The mill stand comprises forming rolls, which have congruent forming elements, mounted on a stand frame member in such a way that one of the forming rolls is adapted for a vertical reverse motion. This forming roll is connected with a hydraulic cylinder provided with control means, interacting with a master device operatively connected with one of the forming rolls.

Abstract: A machine for forming corrugated plate from a flat sheet defined by a plurality of serially arranged corrugating stands. At least one stand has cooperating corrugating rolls defined by a plurality of disc shaped dies which, during corrugating, are rotated at differing rates so that the peripheral speed at a selected diameter, of each such disc substantially equals the linear speed of the plate being corrugated. The discs can be constructed of disc shaped die halves, the axial position of which can be varied so as to vary the corrugation pitch or the profile while maintaining the pitch constant. Drives for the corrugating rolls and, in particular, for the disc dies can power rotate all dies or only some of them while others are free wheeling.

Abstract: A cold sheet metal forming apparatus in which the forming rolls are held at each end by bearing housings in each case held by screw-threaded rods engaging the housings and being secured directly to a main supporting frame.Such an arrangement leaves additional room between adjacent pairs of rolls and a second set of rollers are nested between the first set also with the simplified support arrangement at each end of each roll so as to allow a second rolling line to be kept in position and available for prompt use without as has hitherto been the case the necessity to change rollers.

Abstract: A corrugated plate is disclosed which has trapezoidal corrugations defined by alternating, side by side, relatively thick corrugation peaks and corrugation troughs and relatively thin, inclined corrugation sides which interconnect edges of adjoining peaks and troughs. A method is also disclosed for corrugating the corrugated plate from flat sheet by providing a flat sheet with spaced apart, longitudinally extending, relatively thick sections which thereafter define the corrugation peaks and corrugation troughs or for forming the thick sections by providing a relatively thin sheet and folding over portions of the thin sheet in the areas which ultimately form the corrugation peaks and corrugation troughs so that the latter are defined by a plurality of staked sheet layers.

Abstract: Sheet metal is processed by providing one or more corrugations longitudinally along the sheet in a position spaced from both lateral edges of the sheet while the lateral edges are maintained in fixed relationship to each other, thereby causing the sheet metal portion containing the corrugations to be stretched. The corrugated portion is subsequently rolled or otherwise pressed to flatten out the corrugations either partially or completely, resulting in a sheet which is wider than the original, but which still has certain areas having the original thickness. The sheet metal thus processed may be utilized to form structural members such as channels or studs which are less expensive for a given size than conventional structural members, but which still exhibit sufficient supportive strength by virtue of the portions thereof which retain their original thickness.

Abstract: A machine for manufacturing metal duct or pipe having improved efficiency, reliability, and speed of operation. A continuous, thin metal strip is corrugated, helically wound and seamed to form a durable yet bendable duct or pipe. The corrugation of the strip along its longitudinal axis is achieved by passing the thin metal strip through a plurality of synchronously driven (same RPM) corrugating strip roller die stands, each stand having progressively larger diameter rollers such that as a point on the metal strip passes from one corrugating strip roller stand to the next, the next stand rollers have progressively higher circumferential surface speed than the last, creating a pull on the strip material emerging from the preceeding roller stand, the pulling force at each stand preventing wrinkling or buckling of the strip as it passes through the corrugating operation.

Abstract: A corrugated pipe forming apparatus and method in which flat sheet metal is passed through a plurality of first and second opposite roller pairs and deformed into a corrugated sheet. Lateral lips are formed parallel to the edges of the sheet and extend generally perpendicular to the sheet over the full length thereof. A pipe rolling machine helically deforms the corrugated sheet and folds the lip into a mechanical lock seam defining Pittsburgh lock of predetermined dimensions and tolerances. To maintain such dimensions and tolerances the width of the lips is adjusted by simultaneously moving one roll of each set in identical increments towards and away from the other roll of each set to thereby correspondingly change the depth of the corrugations and the width of the lips. The sheet can be moved laterally to maintain the lips of equal width. Corrugating stations of the device are defined by opposed corrugating rollers with the upper rollers held on a first frame and the lower rollers held on a second frame.