Патент USA US2110378код для вставки
March 8, 1938. w. R. HUME 2,110,378 MANUFACTURE OF PIPES AND THE LIKE FROM SHEET METAL Filed May 26, 1934 5 Sheets-Sheet l March 8, 1938. W. R. HUME 2,110,378 MANUFACTURE OF PIPES AND THE LIKE FROM SHEET METAL Filed May 26, 1934 s sheéts-sheet 2 March s', 193s. w_ R, „UME . 2,110,378> MANUFACTURE OF PIPES AND THE LIKE FROM SHEET METAL _Filed May 26, 1954 ' 5 Sheets-Sheet 3 Patented Mar. 8, 1938 - 2,110,378g UNITED `STATI-:s PAT-ENT .OFFICE , MANUFACTURE OF PIPES ANVI?)- THE LIKE FROM SHEET METALWaiter Reginald Hume, Melbourne,- victoria, Australia, assignor to Hume Steel Limited, Melbourne, Victoria, Australia ’ Application May 26, 1934, Serial No.~ 727,812 . In Australia June 15, 1933 - 6 Claims. (ci. 153-54) This invention relates to the manufacture of lsheet» metal pipes and like hollow bodies wherein flat metal plate is caused to travel lengthwise between successive sets of shaping rollers which 5 progressively bend the plate from its longitudinal edges towards its center so that the plate con verges from the flat at one end into tubular form at the other end. ' , central zone of the plate remains fiat and unsub jected to pressure as aforesaid tends to keep the work perfectly straight during bending opera- v tions so _that a substantially perfectly straight tube results. ' c The invention'also provides apparatus for car rying the method intoeiïect and comprising sets of shaping rollers between which the plate is In` prior proposals of this kind, some or all of caused to pass, arranged 'at intervals in the di the sets of shaping rollers consist of an upper rection of travel of the plate, some of the rollers 10 10 roller and a lower roller, both rotatable about _of each set being located at one side and the other rollers at the opposite side of the longi horizontal axes and extending across the longi tudinal center line of the plate, the respective tudinal center line ofthe plate, each set of roll rollers having complementary convex-concave ers comprising two lower or outside rollers adapt ed to rotate about vertical axes and havingv pe 15 15 peripheral faces which engage the upper and lower surfaces of the plate. Owing to the rollers ripheries of concave curvature conforming, to extending across the center line of the plate the external curvature of the pipe to be formed, as aforesaid, the longitudinally extending central . and >two cooperating upper or inside rollers adapted. to rotate about a transverse axis and zone of the plate is, from the time the plate en ters 'between the first rollers until it assumes or having peripheries of convex curvature conform ing to th'e internal curvature of th'e pipe to be approaches the desired tubular condition, con tinuously subject to bending or to pressure by the formed,` each succeeding set of rollers being dis various pairs of rollers. This bending or pres _ posed nearer to the longitudinal center line of the plate than the preceding set so that the plate sure, which is additional to the bending or pres is progressively bent from its longitudinalV edges 25 sure that is actually necessary for -imparting the 5 towards the center thereof into tubular form. desired finished curvature to the plate, consid According to a preferred mode of carrying out erably increases friction between the plate and rollers as well as Wear on the rollers and may re sult in the central longitudinal zone of the plate, 30 while fiat, being compressed- to an extent suffi cient to disaffect the subsequent bending of the central zone or causevthe finished pipe to lose its true circular section or cylindrical shape. The present invention provides an improved the method, a plate in a substantially flat con dition is fed to and lcaused to’tra'vel longitudi nally between sets of shaping rollers arranged l at intervals in the direction of travel of the plate, some ofthe rollers of each set being located at one side, and the kother rollers atA the opposite side, of the longitudinal centre line of the plate. The ñrst group or set- of shaping rollers'act upon 52.» method of manufacturing sheet meta-1 pipes >and, like hollow bodies according to which a plate the longitudinal edgeportions of the plate to while moving lengthwise is subjected at each side bend these portions arcuately in conformity with of its longitudinal center line, but not at or across the curvature of the finished pipe or like body. . such center line, to pressure between sets of shap - Each succeeding .set of rollers is disposed nearer ing rollers whereby portions of the plate at op-- to the longitudinal centre line of the plate than posite sides of the 'center line are progressively the preceding series of rollers and act upon the platel in a similar manner so that its longitudinal bent towards each other in arcuate form until the longitudinal edges thereof meet, the radii edge portions are gradually or progressively bent of all of the bends being the same as the radius 43 of the pipe to be formed, so that subsequent bending actions merely extend or continue the curvature of previously curved portions without subjecting said portions to further bending or pressing actions, while a flat longitudinally ex tending central portion of the plate of generally isosceles triangular shape which> gradually di minishes in area as bending operations proceed remains unsubjected to pressure or bending until the apex or leading‘end thereof is adjacent thefl- ' 55 nal set of rollers. The fact that the longitudinal >into senil-circular form and their longitudinal edges abutted ready for welding together. The plate isfed forwardly by the shaping rollers. vThe vinvention permits of the economic pro duction of pipes which are practically perfectly straight and cylindrical and of relatively great length devoid of circumferential joints. ' 50 ' The invention also involves apparatus for car rying out the' manufacture of pipes by the'im proved method. ` - Referring to the drawings which form part of this specification- » ’ 1 9,110,373 with the longitudinal centre lille- of the plate 2. >'I‘he periphery of each horizontally rotating out- Figure 1 is a side elevation of a machine~ ac cording to one embodiment of the invention'. F‘igure2illaplanofF'lgure1.»V „ , , F'igure 3 is an end elevation looking onvr the left hand end of Figure 1. . . ' to the externalcurvature of the pipe to be n Figure 4 isa perspective view illustrating the Figure 5 is a fragmentary end view on an en larged scale of one of a set of shaping rollers, and associated parts of the machine. _ Figure 6 is a part sectional view taken on line l Y ’ ` 2. i. the longitudinal edge portions of the leading Figure 7 is a fragmentary end view of .a further set ot shaping rollers and aœociated parts.` „ 1 r F‘lgure 8 is aside elevation of the ?nal twoscts of shaping rollers and associated parts. ' ¿ , , formed. „Cooperating with the pair of rollers I is a pair of ,upper or inside rollersl i mounted Vupon a transverse spindle 1. ’ille periphery of each roller l is of convex curvature conforming to the internal curvature oi the pipe Vto be" formed. Thus. Aas the plate 2 is entered and passed-‘between the cooperating pairs of rollers manner of bending the plate into tubularform. VI-VI'of Figure 5. side roller I is of concave curvature and of ap proximately quarter-circular profile, conforming end ofthe plate are initially bent into the de siredcurvedform, theradius of thebends being ythesameastheraciiusoilthepipetolle iormed p while'theV centralportion of the plate Figure 9 is an end view oi the sets of rollers É. and associated parts seen in the left hand portion side of Figure 8. ‘ 'I‘he rollers of sets f vie'w` of thennal set'of " substantially identical with those of seta seen in _the right are indicated ’by like numerals. The rollers R 'eachfsuccessive set are, however. arranged closer handportionoi’Flg'ureß. 1l is a detail view , Y partlyin 'section to the longitudinal centre line lof 'the apparatus showings bar and a backing member whichfex-Í as will be seen in Figure 2 so that'thefplate will tend within theshaped metal sheet adiacent the >be gradually( shapedinto cylindrical form while passing www!! the sets of rollers. ' e , 'l ` iinal shaping rollers in order toV assist the weld The vertical spindles l of the various' outside ing. ot >abutted longitudinal edges of the Figure 10 is ,rollers-and rollers and the transverse-spindles 1 ot the Vilp _ Figure 12 is anv end view looking on >the right so hand end of Figure 1l. ' - ` ‘ per or inside rollers I may be supported by bear ing brackets l secured toy a framework La’l‘he 13 is an' enlarged plan view of a -lower` , outside rollers may'be driven from a main shaft portionoi the `backing' member seen in Figures 1iA and 12 showing arrangements for the water Il'through'spur gearing I2,V a> countershaft Il.y bevel gearing |74, transverse shafts il, worms il 14 is a vertical cross section taken A and Bvmay be positively driven as by being and worniwheels Il. ‘l 'I‘he inside rollers »l of sets ' . bevel geared as Vat izto the respective side rollers through the 'centre'of the backing member. morder tumore readily explain the method. „3, but such inside‘rollers as well «as those of„sets reference is made to Figure 4 which depicts a , QC, D, Eand F may, Vif desired, be devoid of posi >plate 2 in an intermediate stage of the bending> tive drivingmeans and rotate `merely by friction , i n» 40 operations. It willbe seen therefrom that the wlththe plate.»V ` 'H trailing end luis in its original ilat condition, while the opposed longitudinal edge portions 2b , The wormwheels I‘I may be made fast to the respective outside rollers I. as by means of pegs are progressively bentin curved formation, the I8 extending within co-aligned apertured bosses radii of thebends being'uniform andv equal to I0 o'f the wormwheels ligand rollers). as seen the radius- of the pipe to be formed, while the ' in'Figures 5'and 6 whichmay be assumed to illus extent of the bends' increases towards the lead-ing end 2c which, at the stage indicated, is shaped ¿into cylindrical form. It will valso be noted that the central portion of the plate re fiat until the plate'l‘has as' sumedf the'desired cylindrical form. .Buch iisltV portion will be of Vgenerally isosceles triangular vshape having the trailing edge 2a as its >base - . and its sides, indicated by> the references 2d, de 55 iinedwby lines from which the longitudinal edge trate'the-E‘set'ofrollers. It will also be seen. from these' two figures vthat the transverse shafts , Ii'are supported by 'bearing`brackets “attached Ato. the brackets l `before referred to. - „ , a ` According toF'Agure 7, which illustrates the set of rollersfthe vtwo inside rollers l are canted or tilted upwardly .towardsfeach other.«the shaft 1» having opposltely-inclined portions 'la for the ` respective rollers. ~ 4 , `The rrollers;- of set Gv (see the left hand’part portions 2b commence to curve upwardly from ` of Flgure'ß >and‘F‘lgure 9) -comprise outside rolle.. theV iiat'portion by the action of the successive ers la and inside rollers ïla- similar to those oi sets of rollers. ,The approximately triangular the preceding set but..as at this stage'the platel ,iiat'portion will gradually diminish in area asthe `is closely approaching the ydesired cylindrical so bending operations proceed and will disappear form, the inside rollers are of comparatively CZ) just prior to the entire plate arriving at a tubular small diameter to avoid them-fouling the upper condition. ’ ` ' parts of the curved plate. For similar» reasons. ' Referringìnow 'more particularly to Figures 1, e the inside rollers are mounted upona compara tively short `shaft 22:.fsupported by a hanger 2l , depending from an overhead frame member 2l;~ The rollers of set H (i. e. thefinal set asseen ing denoted `generally in Figure 1 by the referf " ence characters A, B,'C,`D, E, F, G, H. The plate in the rightv hand part of Figure 8 and in Figure V2 to be in the direction from the 10). comprise two laterally-spaced outside rollers ‘ “A” set of rollers to the "H”-set so that it is 3b having concave peripheries `oi’ substantially'. by‘each` succeeding set semi-circular proiile, the upper and'lower rims 3c 70 'progressively of -the two rollers' contacting with, orbeing in of rollers. _. The' rollers of set “A" comprise two lower .or close> proximity to, eachother in alignment withk '2 and 3. the'apparatus is shown as including reight sets of'shaping rollers,l the various sets bej outside rollers 3 rotating about vertical spindles 'the longitudinal centre line of the apparatus, thus l at opposite sides of the longitudinal 75 centrer line _0f the 3pm ¿Whlch‘is coincident defining a substantially circular passage or ori nce' 2l (Figure 12) conforming to the external 3 2,110,378 contour of the pipe to be formed. The co-op erating inside rollers 6b are'located within the confines of this passage Vor orifice and are of rela tively small diameter and may be canted or tilted upwardly away from each other as seen in Fig-_ ures 1'0 and 12. These rollers may be supported by an extension 23a of the hanger 23 which sup ports the rollers 6a ofset G. The hanger and 10 frame may be reinforced by stays 25 (Figure 8). The aforesaid orifice or passage furnished by the rollers 3b of set H is preferably not trulylcir cular but of slightly greater diameter measured horizontally than vertically so that the plate 2 in passing between the rollers is slightly elliptical. A15 As soon as >the plate passes the two rollers, how ever, the resilience of the plate causes it to as sume a substantially truly cylindrical form as small diameter pipes, say up- to six or eight inches in diameter, there is a possibility that, owing to shrinkage or contraction taking place during the cooling of the welded joint, the resultant pipe may lose its desirable straightness and become slightly curved, in a longitudinal direction, the curvature beingv concave along the line of the weld. To _counteract any such tendency, the bed of the machine may be “roached” or alterna tively, the sets of rollers commencing from set 10 B may be successively arranged at a slightly low er level than each -preceding set of rollers, so I that the >plate is fed forwardly at a slight down -ward inclination or curvature which isv corrected or compensated for by shrinkage or contraction -which occurs during the cooling of _the weld. _ In sorne instanceavit may be preferable to iso ' late or separate the final set of rollers H from the ' indicated in Figure 12. The vertical spindles 4a of the outside rollers btherset of rollers so that the plate may be first 20 da, 3b may be supported by bearing brackets 8a shaped into partially cylindrical formby sets A to G, then removed and passed through the set secured to the framework 3 and driving connec tions similar> to those referred to in connection H which may, with the appropriate welding plant, with the preceding set of rollers may extend from. form la. separate unit. 'I_‘o permit ofthe production of pipes of differ countershaft I3 to worm wheels l1 associated 'ent diameters, the brackets 8, 8a supporting the with the outside rollers. ' vIt will be evident from the foregoing that, as spindles of rollers 3, 3a, 3b and 6, 6a,"6b may be the trailing end of the plate is entering between adjustable in a lateral direction upon the frame and being acted upon by the rollers of set A, 9. Alternatively, the‘brackets may be mounted the forward or leading end portion of 'the platel upon longitudinallyextending beams or frame has assumed a substantially cylindrical form. ,members which may be swung or adjusted to 30 Thus, the plate converges from the flat at one wards and from each other so that the lateral spacing of the rollers may- bevaried to suit vthe I end to a tubular form at the other end with the side edges curved upwardly to a progressively diameter of the pipes .to be formed. The rollers greater extent from the flat to the tubular end. may be _readily removed from their spindles and This procedure and formation which results in replaced by -other rollers lhaving peripheries of the central portion of the plate remaining fiat the requisite contour. ' until the plate assumes cylindrical -form en sures that the pipe will be practically perfectly straight from end to end. In order to prevent any possibility of the cen tral flat portion of the plate sagging due to roller pressure duringv the bending process,v a bearer IIJ may extend lengthwise beneath the centre por tion of the plate so as to contact with the un 45 der surface thereof as in Figures 5,- 7, 9 and 10. The longitudinal meeting edges of the- plate Having now described my invention, what `I claim as new and desire to secure by Letters Patent is:--- „ r l 1. Apparatus for manufacturing pipes and like 40 hollow bodies from flat metal plate; comprising sets of shaping rollers, between which the plate is caused to pass, arranged lat intervals in the direction of .travel ofthe plate, some of the rollers of eachset vbeing located at one side and the 45 other rollers at the opposite side of the- longi 2 may be progressively welded together soon after tudinal centre line‘of the plate, each succeeding set of rollers being disposed nearer to theflongi they emerge from the orifice or passage 26 pro vided by rollers -3b. In order to assist effective tudinal centre line of the plate than the preced ing set so that the plate is progressively bent 50 50 welding, a backing member 26 may be arranged to bear upwardly against the internal surface from its longitudinal edges towards the centre of the now cylindrical plate in vertical alignment „thereof into tubular form, the final set of rollers with the- welding electrode 21. The backing ~cömprising two outside rollers adapted to rotate about vertical axes and having peripheries ofv con cave semi-circular profile defining'between them 55 an orifice conforming substantially to the external circular form of the pipe to be produced, and two co-operating inside rollers disposed within said member, which may be of copper in order to 55 exercise a desirable chilling effect upon the line of weld, may have a depending stem 28 engaged at its lower end by a spring 29 anchored to an upper bar 30 attached at its front end to the rear of the hanger 23. A lower bar 3| may also be 60 attached at'its front end to the _hanger and se cured at its rear end to the upper bar by straps 32. 'I'he backing member may be provided at its front with an anti-wearing piece such as a _steel nose 33. jos » Provision may be made for cooling the back ing member by suitable fluid. For example, the backing member and a separable base 34- therefor may be provided in their contiguous faces with grooves 35, 36 defining a passage 31 for'water or 70 the like which may be circulated through the passage‘from a supply pipe 38 to av discharge pipe 39. A gasket 40 may extend between the backing member and its base to prevent leak age of'fiuid from the passage. 75 In the case of manufacturing comparatively orifice or passage on opposite sides of the longi tudinal center line of the plate and adapted to ro tate about different axes which extend trans 60 versely relatively to the path of travel of the plate, the peripheries of the inside rollers being of convex curvature conforming to the internal curvature of the pipe to be formed.`- - 65 2. Apparatus according to claim 1’; in which the diameter of the orifice or passage defined by said loutside rollers of the final set of rollers is slightly greater measured in one direction than in a direction at right angles thereto so that the 70 plate may assume a slightly elliptical form in passing between said rollers and after emerging therefrom may automatically assume a substan tially true circular form. 3. lApparatus for manufacturing pipes and like 2,110,878 hollow bodies from ?at metal plate, comprising sets of shaping rollers between. which the plate like 5. An hollow apparatus bodies forI frommanufacturing ilatl metal plate, pipescom is caused to pass, arrangedat intervals in the . prising a plurality of spaced sets of shaping rollers arranged at intervals ‘in the direction of travel direction oftravel of the plate, some of the roll ers of each setbeing located at one side and the ' oi' the plate and through which the'plate is pro other rollers at the opposite side of the longi-> gressively caused to pass,- the first set oi' rollers oenter line of theplate, _each set of rollers through which said plate is passed having pairs 4comprising two lower or outside rollers adaptedY ¿of rollers -positioned 4to engage portionsfofthe to rotate about vertical axes and having periph vplate adjacent the side edges thereof and bend Y veries'off. concave curvature conforming to the ei: the edges toward each other to form a bend Vin ternaljcur'vatu?e of the pipe to be formed, and saidportions having va.' radim of curvature equal> two' cooperating upper or inside rollers mounted to the radius of the pipe _to be formed. while leav ingA thecentral portion of the plate dat, each sue cessive set of rollers through'which the plate is passed having pairs of'rollers positioned to en gage yfiat portions _of the plate,lmmedlatclyïad-` of convex curvature conforming to the internal. jacent the bent portions formed by the set o! rollers from‘which the plate has Just ' curvature of the pipe to be formed, each fsuc ceeding set of rollers being disposed nearer'to bend the side edgesof the plate closer together yon oppositesides of the longitudinal centerline of the plate and adapted to rotate aboutdiiierent axes which ~extend transversely relatively to the path of travel of ther‘ate and ~having peripheries the longitudinal center line of the plate than the ' preceding yset so'that the' plate is progressively bent from its longitudinal edges Ítowards the center thereof into tubular form. ' 4'. An apparatus for manufacturing pipes and like hollow bodies from fiat metal plate, compris to form in said last-mentionedflat portions a 20 bend'adjacent to and continuous with the pre viously formed bend and having the same radius of curvature, whereby the. iiat portions 'of the plate on opposite sides of the longitudinal» center . , line are progressivelyfbent toward each other in arcuate form until the longitudinal‘sideodges arranged at intervals in the direction of‘travel of ‘ meet without bending' the previously-bent por-. tions, eachv succeeding aet'ot rollers being ar the plate and through which the plate is progres sively caused -to pass. the first set of rollers ranged at a slightly lower level for imparting a downward Icurvature to 'the tube being formed 30 30 through which-said plate is passed having pairs of rollers positioned to engage portions of the to compensate iofr warpage due to shrinkage upon plate' adjacent the side'edges thereof and bend vwelding the side edges »of the bent’plate together the edges toward each other to forma bend in y kto complete the tube, the iinal-’set of rollers com said portions'having a radius o! curvature equal prising two outside. rollers adapted' to rotate to the radius of the pipe to be formed, whileleav - labout vertical axes and'havlng peripheries of con 85 ing the -central portion of the lplate ilat, each cave semi-circular pronle defining between them successive set of rollers through which the plate an oriñce conforming substantially to the ex- ` ternal circular form of the pipe to be produced is passed having pairs of rollers positioned to en gage ilat portions of the plate immediately and each set of rollers including two cooperating ‘ adjacent the bent‘portions formed by the set of inside rollers mounted on opposite sides ofthe ‘ rollers from which the plate has just passed and longitudinal center line'of a plate fed through bend the side edges oi.'- the plate closer'together the apparatus for rotation about axes which ex tend transversely relatively to the path of travel ` 4to form in said last-mentioned ilat portions a oi the Vplate within said oriilce and having periph bend adjacent to and continuous with the previ ously-formed bend and having the same radius --eries conforming to the internal curvature `of the -fing- a plurality of spaced sets of shaping rollers , ' of"cur_vature, whereby the flat portions'of the pipe to be formed. plateon opposite sides ofthe longitudinal center Y , v 6. In a roller bending apparatus for producing line are progressively bent toward each other in arcuate‘torm until the longitudinal side edges »meet without bending the previously-bent por-_ tions, the ñnal set of rollers comprising two outside rollers adapted to rotate about vertical 'pipes' and. like hollow bodies from hat metal plates, a' set of shaping rollers comprising outside rollers adapted to Vrotate about vertical> axes and having peripheries of concave, approxi vaxes and having peripheries ofl concave semi-cir-V them an Vorifice having a diameter y somewhat cular profile defining between them an oriñce conforming substantially to the external circular form of the pipe to be produced, and Aeach set vof greater‘measured in one direction than in a direc tion lat a right angle thereto, and two cooperating` 55 inside rollers mounted on opposite sides of the rollers including two cooperating inside rollers longitudinal center line of a plate fed through the mately semi-circular, profile denning between apparatus for rotation about difl'erent axes which ter line' of a plate fed through the apparatus for extend transversely relatively` to the path of rotation about axes which extend transversely ' travel of said plate within said orifice and having 60 peripheries conforming to the internal curvature ‘ relatively to the path of travel of the vplate with o l in said oriilce and having peripheries conforming of the pipe to be formed. ’mounted on opposite sides of the longitudinal cen on so to the internal curvature of the pipe to be formed. . _ n w. 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