CA1101245A - Bellows sections welder - Google Patents
Bellows sections welderInfo
- Publication number
- CA1101245A CA1101245A CA309,860A CA309860A CA1101245A CA 1101245 A CA1101245 A CA 1101245A CA 309860 A CA309860 A CA 309860A CA 1101245 A CA1101245 A CA 1101245A
- Authority
- CA
- Canada
- Prior art keywords
- welder
- sections
- bellows
- welded
- movable support
- 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
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- Diaphragms And Bellows (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The bellows sections welder according to the invention comprises a bed carrying a stationary support and a movable support with a driver chuck and a driven chuck, respectively, which chucks are kinematically interconnected. The bed further carries a welding torch and a yoke disposed between the chucks and intended for centering the ends of bellows sections being welded. The movable support is driven by at least two pneuma-tic cylinders symmetrically arranged with respect to the lon-gitudinal axis of the welder. Viewed in the direction of the work movement, the movable support is preceded by adjustable stops and followed by a means to receive welded bellows sec-tions.
The bellows sections welder according to the invention comprises a bed carrying a stationary support and a movable support with a driver chuck and a driven chuck, respectively, which chucks are kinematically interconnected. The bed further carries a welding torch and a yoke disposed between the chucks and intended for centering the ends of bellows sections being welded. The movable support is driven by at least two pneuma-tic cylinders symmetrically arranged with respect to the lon-gitudinal axis of the welder. Viewed in the direction of the work movement, the movable support is preceded by adjustable stops and followed by a means to receive welded bellows sec-tions.
Description
~LOWS SEC~IONS ~LD~R
~ he present invention relates to welders ~or butt-weld-ing sections o~ bsllows with circum~erential seams.
rr'he invention is the most advan-tageous ~or welding large-size, thin-walled sections o~ bellows set i~ rotation about their longitudinal axis. '~he welder according to the invention can thus be u5ed to produce bellows o~ a de~ired length and weld adaptors, bottoms and ~langes thereto.
~ here is known a welder (c~. USSR Inventor's Certificate No. 491,458) ~or welding articles witLI circu~erential seams, comPrisin~ a movable bed 7 whereupon there is mounted an axi~
ally movable welcling head with a drive, a means ~or pressing butt ends o~ components being walded against one another, and a mechanism ~or rotating said means.
The welder under review is applicable ~or butt welding of tubular artioles without corrugations on their lateral sur-~aces.
~ owever, in the case o~ welding corrugated bellows sec-tions it is impossible to match and ~irmly press together the butts o~ sections being welded, which, in turn, makes it im-possible to produce a high-strength seam. The disadvantage is due to the ~act that the welder under review lacks a clamp~
ing maans ~or pressing togetber -the butts of corrugated sec-.
~ he present invention relates to welders ~or butt-weld-ing sections o~ bsllows with circum~erential seams.
rr'he invention is the most advan-tageous ~or welding large-size, thin-walled sections o~ bellows set i~ rotation about their longitudinal axis. '~he welder according to the invention can thus be u5ed to produce bellows o~ a de~ired length and weld adaptors, bottoms and ~langes thereto.
~ here is known a welder (c~. USSR Inventor's Certificate No. 491,458) ~or welding articles witLI circu~erential seams, comPrisin~ a movable bed 7 whereupon there is mounted an axi~
ally movable welcling head with a drive, a means ~or pressing butt ends o~ components being walded against one another, and a mechanism ~or rotating said means.
The welder under review is applicable ~or butt welding of tubular artioles without corrugations on their lateral sur-~aces.
~ owever, in the case o~ welding corrugated bellows sec-tions it is impossible to match and ~irmly press together the butts o~ sections being welded, which, in turn, makes it im-possible to produce a high-strength seam. The disadvantage is due to the ~act that the welder under review lacks a clamp~
ing maans ~or pressing togetber -the butts of corrugated sec-.
2~a~
tions being welcled.
There is known a clamping means for welding bellows sec-tions with circumferential seams (c~. USSR Inventor~s Cer-ti~i-ca-te No 439,365~.~he clamping means comprises a base carrying an axle to accommodate bellows sections7 a mechanism ~or pres-sing to~ether and locking i~ place bellows sectio~s, and a drive for ro-tating sections being ~elded. ~aid mechanism has a common drive ~or the locking and pressing means. These are composed o~ separate members so that sections being welded are not match-ed and pressed together over -their entire butt perimeters.
The means un~er review makes it possible to press together and lock in place bellows sec-tions wi-th a diameter o~ 94 mm and wall thicl~ness o~ 0.1 mm.
However, this means does not make it possible -to weld bell-ows sections with thinner wal:ls ancl cliameters o~ more than lOO~m.
Besides, the clamping means under review has a limi-ted working space, whereby -the production o~ long bellows is ei-ther impossible or calls ~or a clamping means o~ inordi~a~e dimensions~
There is known a welaer ~or welding large-siæe article,~
o~ the s~ell type, comprising a bed carrying a drive ~or ro-tating an article being ~velded and a means ~or pressing -toge-ther the butts o~ articles bein~ welded, composed o~ -two chucks, , , : : . : ~,: . : ~ . . :
whereof one is installed in a stationary suppor-t and connect-ed to -the rotation drive, ~vhereas tha other is installed in a movable support. The welcler ~urther includes a pneumatic cy-linder interacting wi-th the movable support, and a leg carry-ing a welding torch movable along a horizontal beam.
On this type of welder, bellows sections are rotated while being welded together. ~he sections are ~ixed between the driver chuck and the driven chuck and rotated by the drive OL ~he driver chuc~ In the course of welding, the edges be-ing welded together may get misaligned or skewed with respect to each other 3 both e~ects may take place simultaneously.
Besides, the welded bellows por-tion iS cantilevered with respect -to the bellows sec-tions being welded, which accounts :~or unclesirable s-tresses in the weld area and a~fects the qua-lity o~ the weld.
'~he conventional welders are not ~it ~or high-quali~y welding o~ thin-walled, large-size bellows sections with cir-cum~erential seams because they are unable to firmly press together the butts o~ sections being welded over -their entire perimeter. It must be remembered in this connection that a gap even of a ~ew hundred-ths o~ a millimeter seriously af~ects heat removal and may cause a burn-through. ~he latter o~ ~he two welders under review does not ensule an accurate center~
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z~s ing of the outer diameters of sections being welded, nor does it provide for an accurate positioning of the butt plane, which means that the weld plane does not always extend at a perpendicular to the longitudinal axis of the article being welded, This factor also affects the quality of welding and calls for additional means to control the mutual positioning of the welding head and the weld, which, in turn, complicates the overall design of the welder.
The absence of simple and reliable welders, which would provide for high-quality welding of large-size, thin~
walled bellows sections, makes it extremely difficult to manufacture large-size, thin-walled bellows and bellows units ~:~
of stainless steel, having a wall thickness of 0.1 to 0.3 mm and a diameter of 200 to 800 mm~
It is the main object of the present invention to provide a welder for welding sections of bellows, which would improve the quality of welded joints in the manufacture of large-size, thin-walled bellows.
It is an equally important object o~ the invention to make such a welder simple in design.
It is an important object of the invention to make such a welder convenient for the operator.
In accordance with a specific embodiment of the invention, a welder for welding sections~of bellows comprises~
a bed, a stationary support mounted on said bed, a ~ :
: rotatable driver chuck mounted on said stationary support, a movable support, a rotatable driven chuck mounted on said movable support with said movable support mounted on said bed for axial movement between a first position closely spaced from said driver chuck and a second position spaced a greater dis-tance from said driver chuck9 a bellows section to be welded ,.~
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being insertable b~tween said chucks when said movable support is in said second position, a drive for rotating said driver chuck, a gear train for providing kinematic coupling between said driver and driven chucl~s, a support mounted on said bed adjacent said driver chuck and carrying a welding torch; a plurality of pneumatic cylinders mounted between said bed and said movable SUppOl ~ for moving said movable support between said first and said second positions, the cylinders being rigid-ly coupled to said movable support and arranged symmetrically with respect to the longitudinal axis of the welder, annular clip means mounted on each of said chucks and extending towards each other, one clip means per each chuck, one of said clip means being spring-loaded in the direction of its chuck, split collar springs mounted on said clip means, one split collar spring per each clip means, said split collar springs having projections on their end faces to interact with respective recesses of corrugations of the bellows sections being welded an expanding yoke for centering outer diameters of bellows sections being welded, said yoke being mounted on said bed between said chucks and resting, when in a wor~ing position, on said split collar springs; and in engagement with the bellow sections to center said sections, two swivel means, each intended for tightening the respective split collar spring about said clip means so that said end face projections inter-act with the corrugations, adjustable stops mounted on said bed and interacting with said movable support for stopping said movable support in a position to perform the centering oper-ation, said adjustable stop being releasable to allow further movement of said movable support to said first position to effect clamping of said bellows sections about their entire periphery, and means for receiving welded bellows sections mounted on said bed behind said movable support.
:- - 5 -From a different aspect, and in accordance with the invention, a method of fabricating a thin-walled tubular metal bellows composed of axially aligned bellows sections welded to one another at their circumferentially extending ~ ~
contiguous end surfaces, comprises placing the sections with :;:
their ends to be welded in confronting relationship, embracing adjacent end-portions of respective bellows sections with ;~
circumferentially extending spring collars, centering the spring collars, and thus the bellows ends, by tightening an ~
expandible yoke around them, resiliently forcing together the ;
opposed end surfaces of respecti~e bellows sections by pres-sure applied by way of the collars while centered by the yoke, expanding the yoke to free it from the collars, rotating the bellows sections in synchronism about the axis on which they are centered to move their circumferentially extending con-tiguous end surfaces located between the collars progressively past a welding station which effects the welding, halting -rotation of the sections after completion of the weld, and removing the collars from the welded-together sections. :
The foregoing welder design accounts for an improved quality of welded joints in the manufacture o~ large-size, thin~walled bellows, which is due to the fact that the butts :
of sections being welded are accurately centered by the expand- ~
ing yoke resting on the split collar springs which are firmly -tightened by the swivel means on the clip means and are close- :
5a -2~S
ly fitted around the perillleter o~ the bu-tts of sections being welded by the clip means which is spring-loaded in relation to i-ts chuck.
~ he kinematic coupling between the chucks accoun-ts for synchronous rotation o~ the bellows sections being welded. '~he pneumatic cylinders, which fix the movable support in a desired positionJ pxevent skewing o~ the edges in the welding zone.
'rhe means for receiving welded bellows sec-tions serves the same purpose in -that it supports -the finished portion o~ bel~
lows and -thus makes it possible -to manufacture bellows of con-siderable lengths withou-t sagg~ing, which otherwise migh-t ad-versely affect the welded joints.
- It is e~pedient -that the kinematic coupling bet~.veen the driver and driven chucks shou]d be e~eected by means o~ gears interacting with respec-tive gears mounted on a shaft secured in bearings inst~lled on -the bed.
~; This type of kinema-tic coupling is both simple and re-liable. It also ensures synchronous ro-tation of sections be-ing welded, which, in -turn, accounts for a high quality of seams It i9 pre~erable that each of the adjustable stops should be composed of a Pair o~ spring-loaded rods, each having a transversely extending through hole to receive a rack .
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~ a~l245 provided wi-th a drive ~or being set in longi-tudinal mot,ion and having slanted surfaces in-teracting with respective slanted surfaces o~ the walls o~ -the holes, the rods and racks be-inp, arranged on guides mounted on the bad.
'~he ~oregoing stop design is simple enough and conveni-ent in opera-tion.
In addition~ it helps to minimize the gap between -the butts of bellows sections being welded, which is necessary ~or an accurate cen-tering o~ the butts by the e~panding yoke.
'~he welder according to the invention ~ay be provided with at least one additional pair o~ pneuma-tic cylinders ar-ranged symmetrically with respect to vertica1 and horizontal planes e~tending through the longitudinal axis of -the wel~er.
~ his makes it possible to weld bellows sec-tions o~ very lar~e diameters, press the butts o~ the sections being welded uni~ormly a~d tightly against one another, and accura-tely en-sur~ heir ver-tical position.
'lhe welder according to the invention may be provided with a -third pneumatic cylinder, in which case it is expedient tha-t the pneumatic cylinders should be spaced at equal dis--tances ~rom the longitudinal a~is ol the welder, as well as at an equal distance ~rom one ano-theri it is also e~pedient -that the pneumatiG cylinders should be arranged symmetrically :,. : .-. : : : , . : . : :
z~s in relation to the vertical plane ex-tending through -the longi-tudinal a~is of the welder.
~ he above number and arrangemen~t o~ the pneumatic cy-linders simpli~y -the calculation o~ forces re~uired to press the butts o~ bellows sections being weldecl agains-t one ano-ther ~
It is desirable that the support carrying the welding-torch should be arranged in the plane o~ -the e~panding ~-oke and carry a pneuma-tic cylinder ~i-th a rod e~tending through said cylinder, one end o~ the rod carrying ths welding -torch, whereas its opposite end carries a means to lock the welding torch in the welding position.
'~he above arrangement o~ the welding torch accounts for an improvcd quality o~ welded joints because the torch is ri-gidly secured with respect to the edp,es bein~ welded. In ad-dition, such an arrangement ~akes it possible to bring the weld-ing torch rapidly and easily to both the initlal and working positions.
It is expedient that the means ~or receiving welded bel~
lows sections should comprise rollers whose longitudinal a~es are parallel to that o~ the welder 5 the rollers being arranged on a circular arc.
~ 'his provicles for ~ree rotation o~ bellows sections be-.. .. ...
:. . . ~ ~: ; .
~:~f~:1245 ing welded, as well as ~or longitudinal It~ovement o~ these sec-tions afte~r ~the welding.
It is desirable -tha-t the lateral surf~ces of the rollers should have a coating of pol~luoroethylene resin.
~ he latter factor prevents de~ormation O:e the other s~r-face o~ bellows sections as these rotate in the course o~ weld-ing or are moved in the longitudinal direction.
~ ther objects and advantages of the present invention will become more apparen-t from the following detailed descrip-tion of' a preferred embodiment thereoY, taken in conjunction wi-th the accomPanying drawings, wherein;
Fig. 1 is a side view o~ a welder according to the in~
vention with a bellows (shown b~ the dot-and-dash lines);
Fig. 2 is a closer view of zone A o~ -the welder of Fi~. 1, Fig. 3 is a longitudinal section taken on line III-III
of ~ig. 2 3 Fig. L~ iS a transverse section taken on line IY-IV
of Fig. 2j Fig. 5 is a closer view of ~one B o~ the welder of ~ig. 1, Fig. 6 is a longitudinal section taken on line IV-IV
of Fig~ 5i Fig. 7 is a transverse section taken on line VII-VII
of ~igo ls - ~ .... .. .. .. .
Fig~ 8 is a schematic view o~ a first preferred arrange-ment o~ -two pairs o~ pneumatic cylinders;
~ `ig. 9 is a schematic view o~ a second pre~erred arrange~
~e~ o~ bwo pairs o~ pn0umatio cylinders;
Fig. lO is a schematic view o~ a pre~erred arrange~lent o~ three pneumatic cylinders.
Xeferring -to the attached drawings, the welder accord-ing to ~he invention comprises a bed 1 (Fig~ 1), whereupon there is moun-ted a stationary support 2 with a driver chuck 3 kine-ma-tically linked -to its rotation drive 4 and -to a driven chuck 5 mounted on a movable suppor~ 6 driven by a-t least one pair o~ pneumatic cylinders 7. r~he bed 1 also carries a support 8 (Fig~ 7) which, in turn, carries a welding -torch 9.
'rhe kinematic coupling between the driver chuck 3 and -the driven chuck 5 (Fig. 1) is e~ected by means o~ a gear train co~prising gears lO and 11 mounted on the chucks 3 and 5, respectively, and interacting with gears 12 and 13 mounted on a sha~t 14 5ecured in bearings (not shown) provided in the : ;
bed 1.
r~he driver chuck 3 carries a clip means 15. r~he driven chuck 5 oarries a clip mea~s 16 which is spring-loaded by a 5pacer 17 (Fig. 3~ of an elas-tic material, such as rubber.
Disposed between the chucks 3 and 5 (Fig. 1) is an e~-panding yoke 18 (Fig. 7) mounted on -the bed 1 and resting 3 .
.: -:.. ` ~ , " ' , ` :
':: ' ,' when in the working posi-tion~ on spli-t collar spri~gs 20 and 21 (Fig. 3). The yoke 18 is intended to cen-ter the outer dia-meters o~ bellOws sections 19 being welded.
~ ach o~ the clip means 15 and 16 has its own spli-t collar spring, 20 and 21, respec-tively~ which are tightened by swivel means 22 (Figs 2 and 4). The split collar springs 20 and 21 (Fig. 3) have projections 23 to interact with recesses 24 of the corrugations o~ the bellows sac-tions 19 (shown by the dot--and-dash lines) bein~ welded, which projections 23 are intend-ed to improve the heat dissipation in the course o~ welding.
Viewed in the direction of movement of the bellows sec-tions 19 being welded, the movable support 6 is preceded by adjustable stops 25 (~igs 5 and 6) mounted on the bed 1. ~ach of the adjus-t~ble stops 25 is composed o~ a pair o~ rod~ 26 Yorced by springs 27 away from the movable support 6. ~ach o~
the rods 26 ha~ a transversely e~tending t~rough hole 28 (Fig.6) întended to receive a rack 29 provided with a drive 30 ~or set-ting it in longitudinal motion. The rack 29 has slan-ted sur-faces 31 interac-ting with respective slan-ted surfaces 32 o~
the wall`s o~ the through holes 28 provided in the rods 26. The rack 29 and rods 26 are arranged in guides 33 moun-ted on -the bed 1. 'l'he stops 25 in-teract with the movable support 6 so as to lock i-t in the desired position and thus minimize the gap (H) (Fig~ 5) between the end faces of the split collar springs 20 and 21 and properly match the edges of the bellows sections 19 (Fiy. 3) as these are being centered. The movable support 6 (Fi~. 1) with the driven chuck 5 is driven by two or more pneumatic cylinders 7 arranged symmetrically with re~
spect to the longitudinal axis of the welder and pivotably secured in brackets 34 mounted on the bed 1. Rods 35 of the pneumatic cylinders are rigidly coupled to the movable support 6. :
The support 8 (Fig. 7), which carries the welding torch 9, is arranged in the plane of the expanding yoke 18 and also carries a pneumatic cylinder 36 with a hollow piston rod 37 extending through said cylinder. Mounted at one end 38 of the rod 37 is the welding torch 9, mounted at the opposite end 39 o~ the rod 37 is a means 40 for locking the welding torch 9 in the welding position. The means 40 comprises a plate 41 secured at the end 39 o~ the rod 37 of the pneumatic cylinder 36 and carrying a guide member 42 interacting with a hole provided in a bracket 43 rigidly mountad on the housing of the pneumatic cylinder 36. The way the welding torch 9 is locked in the welding position precludes its rotation about the long-itudinal axis of the housing of the pneumatic cylinder 36.
Viewed in the direction of the work movement, the movable .
support 6 has behind itsel~ a means 44 for receivin~ the welded bellow~ sections 19~ Tlle means l~4 iS mounted on the bed 1 (Fig.l) and composed o~ rollers 45 (~ig. 8) spaced on a circular arc, -their longitudinal a~es being Parallel to the longitudinal axis (O) of the welderO The lat-eral sur~aces o~ the rollers 45 (Fig.l) have a coating o~ poly~luoroethylene resin.
; According to an alternative embodiment, -the welder is provided with additional Pairs Oe pneumatlc cylinders 4-6 (Fig.8) arran~ed symmetrically with respect to a vertical plane 47 and a horizontal plane 48 e~tending through the longitudinal axis (O) o~ the welder.
The pairs o~ the pneumatic c~linders 7 and 46 may be ar-ranged as shown in Fig. 9~
Th~ welder according to the inventio~ may have three pneu matic cylinders 49 (Fig. 10) spaced a-t equal dis-tances 1 ~rom one another and at equal dis-tances (r) from the longi-tudinal axis O o~ the welder, and arranged symmetrically vrith respect to the vertical plane 47 e~tending through the longitudinal a~is O Q~ the welder~
The bellows sections welder according to the invention operates as follo~s.
~ o pIace the bellows sections 19 (Fig~ 1) to be vrelded between the chuc~s 3 and 5, the movable support 6 is moved - ~; . ., : . . :
:
to its extreme position by the pneumatic cylinders 7, or by the pneumatic cylinders 7 and 46 shown in Figs 8 and 9, or ~ -by the pneumatic cylinders 49 shown in Fig. 10. Simultaneously, the rod 37 of the pneumatic cylinder 36 drives the welding torch 9 (Fig. 7) to the initial position away from the welding zone. The swivel means 22 (Figs 2 and 4) are turned so as to free the end faces of the split collar springs 20 and 21 (Fig. 3). The collar springs 20 and 21 are then fitted over the outer surfaces of the clip means 15 and 16 (Figs. 1 and 3).
The drive 30 (Fig. 6) moves the rack 29 so that the stops 25 are brought to a position which accounts for a minimum gap H ~ -between the end faces of the split collar springs 20 and 21 (Fig. 5).
The bellows sections 19 to be welded are inserted one by one into the holes of the clip means 15 and 16 (Figs 1 and 3). The projections 23 of the split collar springs 20 and 21 are introduced into the recesses 24 (Fig. 3) between the corrugations of the bellows sections 19, whereupon the end ~ ;
faces of the collar springs 20 and 21 are brought together by the swivel means 22 (Figs 2 and 4).
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s The pneumatic cylinders 7 (Fig. 1) drive the movable suppor-t 6 to ~ring it into contact with the supports 25 (FigsO
5 and 6). The expanding yoke 18 (Figs 3 and 7) is then tighten-ed, and the bellows sections 19 to be welded are centered. The drive 30 (Fig. 6) then drives the rack 29 so that it releases the rods 26 which are brought by the springs 27 to the initial position. The pneumatic cylinders 7 tFig. 1) bring together the edges of the bellows sections 19 centered by the yoke 1~3 (Fig. 3).
As this takes place, the elastic spacer 17 deforms ~ , and firmly presses the edges of the sections 19 one against ; `-the other over their entire perimeter. The halves of the yoke 18 (Fig. 7) are brought apart. The hollow rod 37 of the pneu-matic cylinder 36 brings the welding torch 9 to the welding ~;
zone, whereupon the torch 9 is locked by the means 40 in the ` welding position. The drive ~ (Fig. 1) is then brought into ' action to rotate -the chucks 3 and 5 and the bellows sections 19, and welding is carried out. In the course of welding9 heat removal is improved due to the presence of the projections 23 (Fig. 3). The welding being over, the swivel means 22 (Figs 2 and 4) are turned so as to open the split collar springs 20 and 21 (Fig. 3) and thus remove the welded bellows sections 19 from the split collar springs 20 and 21 To weld a new bellows section 19 to those already welded ;
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together, the welding torch ~ ~ig. 7) i5 ~oved away from -the weldin~ position, and -the l~ovable support 6 (Fig, 1) is driven to its initial position, ~he~welded bellows sections 19 are ~oved -to the means 44 ~or receiving welded bellows sections.
~he surfaces of the rollers 45 of the means 44 are coated with polyf'luoroet~ylene resin, where~ore -the sur~ace o~ -the bellows section 19 is no-t de~ormed as it rotates and moves in -the lon-gitudinal direction. l`he foregoing sequence o~ events is then re-peated.
Tests haVe shown that the welder according to the inven-tion can produce high-quality welded join-ts when bu-tt-welding sec-tions of thin-walled bellows. r~his is due to -the fac-t that the bellows sections are accurately centered by -the expanding yoke, and that their edges are uni~ormly and ~irmly pressed together by the clip means mounted on the chucks and provided with split collar springs. Improved dissipation o~ heat due to the provi-sion o~ proaections on the end ~aces o~ the split collar springs 7 which are received in the recesses between -the corruga-tions o~
bellows sections, rules out burn-throughs. ~he welder accord-ing to the invention also rules out skewing o:~ bellows sections being welded in the weld plane and with respect to the long~i-tu-dinal axis o~ the bellows and -the welding head, which is due to the ~act that the bellows sec-tions are ~irmly pressed toge-ther by the symme-trically arranged pneumatic cylinders, and .
x -that the welding head is firmly locked in the welding position.
Due to the above combination o~ ~eatures, the welder o~
- this invention does not require any additional means to con-trol -the mutual positioning o~ -the torch and weld, which are normal-ly employed in butt welding of ~lexible proliled ar-ticles, such as bellows.
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tions being welcled.
There is known a clamping means for welding bellows sec-tions with circumferential seams (c~. USSR Inventor~s Cer-ti~i-ca-te No 439,365~.~he clamping means comprises a base carrying an axle to accommodate bellows sections7 a mechanism ~or pres-sing to~ether and locking i~ place bellows sectio~s, and a drive for ro-tating sections being ~elded. ~aid mechanism has a common drive ~or the locking and pressing means. These are composed o~ separate members so that sections being welded are not match-ed and pressed together over -their entire butt perimeters.
The means un~er review makes it possible to press together and lock in place bellows sec-tions wi-th a diameter o~ 94 mm and wall thicl~ness o~ 0.1 mm.
However, this means does not make it possible -to weld bell-ows sections with thinner wal:ls ancl cliameters o~ more than lOO~m.
Besides, the clamping means under review has a limi-ted working space, whereby -the production o~ long bellows is ei-ther impossible or calls ~or a clamping means o~ inordi~a~e dimensions~
There is known a welaer ~or welding large-siæe article,~
o~ the s~ell type, comprising a bed carrying a drive ~or ro-tating an article being ~velded and a means ~or pressing -toge-ther the butts o~ articles bein~ welded, composed o~ -two chucks, , , : : . : ~,: . : ~ . . :
whereof one is installed in a stationary suppor-t and connect-ed to -the rotation drive, ~vhereas tha other is installed in a movable support. The welcler ~urther includes a pneumatic cy-linder interacting wi-th the movable support, and a leg carry-ing a welding torch movable along a horizontal beam.
On this type of welder, bellows sections are rotated while being welded together. ~he sections are ~ixed between the driver chuck and the driven chuck and rotated by the drive OL ~he driver chuc~ In the course of welding, the edges be-ing welded together may get misaligned or skewed with respect to each other 3 both e~ects may take place simultaneously.
Besides, the welded bellows por-tion iS cantilevered with respect -to the bellows sec-tions being welded, which accounts :~or unclesirable s-tresses in the weld area and a~fects the qua-lity o~ the weld.
'~he conventional welders are not ~it ~or high-quali~y welding o~ thin-walled, large-size bellows sections with cir-cum~erential seams because they are unable to firmly press together the butts o~ sections being welded over -their entire perimeter. It must be remembered in this connection that a gap even of a ~ew hundred-ths o~ a millimeter seriously af~ects heat removal and may cause a burn-through. ~he latter o~ ~he two welders under review does not ensule an accurate center~
. -. .. ~ . .
., , , , ~ ~
z~s ing of the outer diameters of sections being welded, nor does it provide for an accurate positioning of the butt plane, which means that the weld plane does not always extend at a perpendicular to the longitudinal axis of the article being welded, This factor also affects the quality of welding and calls for additional means to control the mutual positioning of the welding head and the weld, which, in turn, complicates the overall design of the welder.
The absence of simple and reliable welders, which would provide for high-quality welding of large-size, thin~
walled bellows sections, makes it extremely difficult to manufacture large-size, thin-walled bellows and bellows units ~:~
of stainless steel, having a wall thickness of 0.1 to 0.3 mm and a diameter of 200 to 800 mm~
It is the main object of the present invention to provide a welder for welding sections of bellows, which would improve the quality of welded joints in the manufacture of large-size, thin-walled bellows.
It is an equally important object o~ the invention to make such a welder simple in design.
It is an important object of the invention to make such a welder convenient for the operator.
In accordance with a specific embodiment of the invention, a welder for welding sections~of bellows comprises~
a bed, a stationary support mounted on said bed, a ~ :
: rotatable driver chuck mounted on said stationary support, a movable support, a rotatable driven chuck mounted on said movable support with said movable support mounted on said bed for axial movement between a first position closely spaced from said driver chuck and a second position spaced a greater dis-tance from said driver chuck9 a bellows section to be welded ,.~
~ ~, ,~ ,1; :
S
being insertable b~tween said chucks when said movable support is in said second position, a drive for rotating said driver chuck, a gear train for providing kinematic coupling between said driver and driven chucl~s, a support mounted on said bed adjacent said driver chuck and carrying a welding torch; a plurality of pneumatic cylinders mounted between said bed and said movable SUppOl ~ for moving said movable support between said first and said second positions, the cylinders being rigid-ly coupled to said movable support and arranged symmetrically with respect to the longitudinal axis of the welder, annular clip means mounted on each of said chucks and extending towards each other, one clip means per each chuck, one of said clip means being spring-loaded in the direction of its chuck, split collar springs mounted on said clip means, one split collar spring per each clip means, said split collar springs having projections on their end faces to interact with respective recesses of corrugations of the bellows sections being welded an expanding yoke for centering outer diameters of bellows sections being welded, said yoke being mounted on said bed between said chucks and resting, when in a wor~ing position, on said split collar springs; and in engagement with the bellow sections to center said sections, two swivel means, each intended for tightening the respective split collar spring about said clip means so that said end face projections inter-act with the corrugations, adjustable stops mounted on said bed and interacting with said movable support for stopping said movable support in a position to perform the centering oper-ation, said adjustable stop being releasable to allow further movement of said movable support to said first position to effect clamping of said bellows sections about their entire periphery, and means for receiving welded bellows sections mounted on said bed behind said movable support.
:- - 5 -From a different aspect, and in accordance with the invention, a method of fabricating a thin-walled tubular metal bellows composed of axially aligned bellows sections welded to one another at their circumferentially extending ~ ~
contiguous end surfaces, comprises placing the sections with :;:
their ends to be welded in confronting relationship, embracing adjacent end-portions of respective bellows sections with ;~
circumferentially extending spring collars, centering the spring collars, and thus the bellows ends, by tightening an ~
expandible yoke around them, resiliently forcing together the ;
opposed end surfaces of respecti~e bellows sections by pres-sure applied by way of the collars while centered by the yoke, expanding the yoke to free it from the collars, rotating the bellows sections in synchronism about the axis on which they are centered to move their circumferentially extending con-tiguous end surfaces located between the collars progressively past a welding station which effects the welding, halting -rotation of the sections after completion of the weld, and removing the collars from the welded-together sections. :
The foregoing welder design accounts for an improved quality of welded joints in the manufacture o~ large-size, thin~walled bellows, which is due to the fact that the butts :
of sections being welded are accurately centered by the expand- ~
ing yoke resting on the split collar springs which are firmly -tightened by the swivel means on the clip means and are close- :
5a -2~S
ly fitted around the perillleter o~ the bu-tts of sections being welded by the clip means which is spring-loaded in relation to i-ts chuck.
~ he kinematic coupling between the chucks accoun-ts for synchronous rotation o~ the bellows sections being welded. '~he pneumatic cylinders, which fix the movable support in a desired positionJ pxevent skewing o~ the edges in the welding zone.
'rhe means for receiving welded bellows sec-tions serves the same purpose in -that it supports -the finished portion o~ bel~
lows and -thus makes it possible -to manufacture bellows of con-siderable lengths withou-t sagg~ing, which otherwise migh-t ad-versely affect the welded joints.
- It is e~pedient -that the kinematic coupling bet~.veen the driver and driven chucks shou]d be e~eected by means o~ gears interacting with respec-tive gears mounted on a shaft secured in bearings inst~lled on -the bed.
~; This type of kinema-tic coupling is both simple and re-liable. It also ensures synchronous ro-tation of sections be-ing welded, which, in -turn, accounts for a high quality of seams It i9 pre~erable that each of the adjustable stops should be composed of a Pair o~ spring-loaded rods, each having a transversely extending through hole to receive a rack .
: . . . .
. ~ ., . ~ , ., ~ :
~ a~l245 provided wi-th a drive ~or being set in longi-tudinal mot,ion and having slanted surfaces in-teracting with respective slanted surfaces o~ the walls o~ -the holes, the rods and racks be-inp, arranged on guides mounted on the bad.
'~he ~oregoing stop design is simple enough and conveni-ent in opera-tion.
In addition~ it helps to minimize the gap between -the butts of bellows sections being welded, which is necessary ~or an accurate cen-tering o~ the butts by the e~panding yoke.
'~he welder according to the invention ~ay be provided with at least one additional pair o~ pneuma-tic cylinders ar-ranged symmetrically with respect to vertica1 and horizontal planes e~tending through the longitudinal axis of -the wel~er.
~ his makes it possible to weld bellows sec-tions o~ very lar~e diameters, press the butts o~ the sections being welded uni~ormly a~d tightly against one another, and accura-tely en-sur~ heir ver-tical position.
'lhe welder according to the invention may be provided with a -third pneumatic cylinder, in which case it is expedient tha-t the pneumatic cylinders should be spaced at equal dis--tances ~rom the longitudinal a~is ol the welder, as well as at an equal distance ~rom one ano-theri it is also e~pedient -that the pneumatiG cylinders should be arranged symmetrically :,. : .-. : : : , . : . : :
z~s in relation to the vertical plane ex-tending through -the longi-tudinal a~is of the welder.
~ he above number and arrangemen~t o~ the pneumatic cy-linders simpli~y -the calculation o~ forces re~uired to press the butts o~ bellows sections being weldecl agains-t one ano-ther ~
It is desirable that the support carrying the welding-torch should be arranged in the plane o~ -the e~panding ~-oke and carry a pneuma-tic cylinder ~i-th a rod e~tending through said cylinder, one end o~ the rod carrying ths welding -torch, whereas its opposite end carries a means to lock the welding torch in the welding position.
'~he above arrangement o~ the welding torch accounts for an improvcd quality o~ welded joints because the torch is ri-gidly secured with respect to the edp,es bein~ welded. In ad-dition, such an arrangement ~akes it possible to bring the weld-ing torch rapidly and easily to both the initlal and working positions.
It is expedient that the means ~or receiving welded bel~
lows sections should comprise rollers whose longitudinal a~es are parallel to that o~ the welder 5 the rollers being arranged on a circular arc.
~ 'his provicles for ~ree rotation o~ bellows sections be-.. .. ...
:. . . ~ ~: ; .
~:~f~:1245 ing welded, as well as ~or longitudinal It~ovement o~ these sec-tions afte~r ~the welding.
It is desirable -tha-t the lateral surf~ces of the rollers should have a coating of pol~luoroethylene resin.
~ he latter factor prevents de~ormation O:e the other s~r-face o~ bellows sections as these rotate in the course o~ weld-ing or are moved in the longitudinal direction.
~ ther objects and advantages of the present invention will become more apparen-t from the following detailed descrip-tion of' a preferred embodiment thereoY, taken in conjunction wi-th the accomPanying drawings, wherein;
Fig. 1 is a side view o~ a welder according to the in~
vention with a bellows (shown b~ the dot-and-dash lines);
Fig. 2 is a closer view of zone A o~ -the welder of Fi~. 1, Fig. 3 is a longitudinal section taken on line III-III
of ~ig. 2 3 Fig. L~ iS a transverse section taken on line IY-IV
of Fig. 2j Fig. 5 is a closer view of ~one B o~ the welder of ~ig. 1, Fig. 6 is a longitudinal section taken on line IV-IV
of Fig~ 5i Fig. 7 is a transverse section taken on line VII-VII
of ~igo ls - ~ .... .. .. .. .
Fig~ 8 is a schematic view o~ a first preferred arrange-ment o~ -two pairs o~ pneumatic cylinders;
~ `ig. 9 is a schematic view o~ a second pre~erred arrange~
~e~ o~ bwo pairs o~ pn0umatio cylinders;
Fig. lO is a schematic view o~ a pre~erred arrange~lent o~ three pneumatic cylinders.
Xeferring -to the attached drawings, the welder accord-ing to ~he invention comprises a bed 1 (Fig~ 1), whereupon there is moun-ted a stationary support 2 with a driver chuck 3 kine-ma-tically linked -to its rotation drive 4 and -to a driven chuck 5 mounted on a movable suppor~ 6 driven by a-t least one pair o~ pneumatic cylinders 7. r~he bed 1 also carries a support 8 (Fig~ 7) which, in turn, carries a welding -torch 9.
'rhe kinematic coupling between the driver chuck 3 and -the driven chuck 5 (Fig. 1) is e~ected by means o~ a gear train co~prising gears lO and 11 mounted on the chucks 3 and 5, respectively, and interacting with gears 12 and 13 mounted on a sha~t 14 5ecured in bearings (not shown) provided in the : ;
bed 1.
r~he driver chuck 3 carries a clip means 15. r~he driven chuck 5 oarries a clip mea~s 16 which is spring-loaded by a 5pacer 17 (Fig. 3~ of an elas-tic material, such as rubber.
Disposed between the chucks 3 and 5 (Fig. 1) is an e~-panding yoke 18 (Fig. 7) mounted on -the bed 1 and resting 3 .
.: -:.. ` ~ , " ' , ` :
':: ' ,' when in the working posi-tion~ on spli-t collar spri~gs 20 and 21 (Fig. 3). The yoke 18 is intended to cen-ter the outer dia-meters o~ bellOws sections 19 being welded.
~ ach o~ the clip means 15 and 16 has its own spli-t collar spring, 20 and 21, respec-tively~ which are tightened by swivel means 22 (Figs 2 and 4). The split collar springs 20 and 21 (Fig. 3) have projections 23 to interact with recesses 24 of the corrugations o~ the bellows sac-tions 19 (shown by the dot--and-dash lines) bein~ welded, which projections 23 are intend-ed to improve the heat dissipation in the course o~ welding.
Viewed in the direction of movement of the bellows sec-tions 19 being welded, the movable support 6 is preceded by adjustable stops 25 (~igs 5 and 6) mounted on the bed 1. ~ach of the adjus-t~ble stops 25 is composed o~ a pair o~ rod~ 26 Yorced by springs 27 away from the movable support 6. ~ach o~
the rods 26 ha~ a transversely e~tending t~rough hole 28 (Fig.6) întended to receive a rack 29 provided with a drive 30 ~or set-ting it in longitudinal motion. The rack 29 has slan-ted sur-faces 31 interac-ting with respective slan-ted surfaces 32 o~
the wall`s o~ the through holes 28 provided in the rods 26. The rack 29 and rods 26 are arranged in guides 33 moun-ted on -the bed 1. 'l'he stops 25 in-teract with the movable support 6 so as to lock i-t in the desired position and thus minimize the gap (H) (Fig~ 5) between the end faces of the split collar springs 20 and 21 and properly match the edges of the bellows sections 19 (Fiy. 3) as these are being centered. The movable support 6 (Fi~. 1) with the driven chuck 5 is driven by two or more pneumatic cylinders 7 arranged symmetrically with re~
spect to the longitudinal axis of the welder and pivotably secured in brackets 34 mounted on the bed 1. Rods 35 of the pneumatic cylinders are rigidly coupled to the movable support 6. :
The support 8 (Fig. 7), which carries the welding torch 9, is arranged in the plane of the expanding yoke 18 and also carries a pneumatic cylinder 36 with a hollow piston rod 37 extending through said cylinder. Mounted at one end 38 of the rod 37 is the welding torch 9, mounted at the opposite end 39 o~ the rod 37 is a means 40 for locking the welding torch 9 in the welding position. The means 40 comprises a plate 41 secured at the end 39 o~ the rod 37 of the pneumatic cylinder 36 and carrying a guide member 42 interacting with a hole provided in a bracket 43 rigidly mountad on the housing of the pneumatic cylinder 36. The way the welding torch 9 is locked in the welding position precludes its rotation about the long-itudinal axis of the housing of the pneumatic cylinder 36.
Viewed in the direction of the work movement, the movable .
support 6 has behind itsel~ a means 44 for receivin~ the welded bellow~ sections 19~ Tlle means l~4 iS mounted on the bed 1 (Fig.l) and composed o~ rollers 45 (~ig. 8) spaced on a circular arc, -their longitudinal a~es being Parallel to the longitudinal axis (O) of the welderO The lat-eral sur~aces o~ the rollers 45 (Fig.l) have a coating o~ poly~luoroethylene resin.
; According to an alternative embodiment, -the welder is provided with additional Pairs Oe pneumatlc cylinders 4-6 (Fig.8) arran~ed symmetrically with respect to a vertical plane 47 and a horizontal plane 48 e~tending through the longitudinal axis (O) o~ the welder.
The pairs o~ the pneumatic c~linders 7 and 46 may be ar-ranged as shown in Fig. 9~
Th~ welder according to the inventio~ may have three pneu matic cylinders 49 (Fig. 10) spaced a-t equal dis-tances 1 ~rom one another and at equal dis-tances (r) from the longi-tudinal axis O o~ the welder, and arranged symmetrically vrith respect to the vertical plane 47 e~tending through the longitudinal a~is O Q~ the welder~
The bellows sections welder according to the invention operates as follo~s.
~ o pIace the bellows sections 19 (Fig~ 1) to be vrelded between the chuc~s 3 and 5, the movable support 6 is moved - ~; . ., : . . :
:
to its extreme position by the pneumatic cylinders 7, or by the pneumatic cylinders 7 and 46 shown in Figs 8 and 9, or ~ -by the pneumatic cylinders 49 shown in Fig. 10. Simultaneously, the rod 37 of the pneumatic cylinder 36 drives the welding torch 9 (Fig. 7) to the initial position away from the welding zone. The swivel means 22 (Figs 2 and 4) are turned so as to free the end faces of the split collar springs 20 and 21 (Fig. 3). The collar springs 20 and 21 are then fitted over the outer surfaces of the clip means 15 and 16 (Figs. 1 and 3).
The drive 30 (Fig. 6) moves the rack 29 so that the stops 25 are brought to a position which accounts for a minimum gap H ~ -between the end faces of the split collar springs 20 and 21 (Fig. 5).
The bellows sections 19 to be welded are inserted one by one into the holes of the clip means 15 and 16 (Figs 1 and 3). The projections 23 of the split collar springs 20 and 21 are introduced into the recesses 24 (Fig. 3) between the corrugations of the bellows sections 19, whereupon the end ~ ;
faces of the collar springs 20 and 21 are brought together by the swivel means 22 (Figs 2 and 4).
.~`
: ' ~ - 14 -."
s The pneumatic cylinders 7 (Fig. 1) drive the movable suppor-t 6 to ~ring it into contact with the supports 25 (FigsO
5 and 6). The expanding yoke 18 (Figs 3 and 7) is then tighten-ed, and the bellows sections 19 to be welded are centered. The drive 30 (Fig. 6) then drives the rack 29 so that it releases the rods 26 which are brought by the springs 27 to the initial position. The pneumatic cylinders 7 tFig. 1) bring together the edges of the bellows sections 19 centered by the yoke 1~3 (Fig. 3).
As this takes place, the elastic spacer 17 deforms ~ , and firmly presses the edges of the sections 19 one against ; `-the other over their entire perimeter. The halves of the yoke 18 (Fig. 7) are brought apart. The hollow rod 37 of the pneu-matic cylinder 36 brings the welding torch 9 to the welding ~;
zone, whereupon the torch 9 is locked by the means 40 in the ` welding position. The drive ~ (Fig. 1) is then brought into ' action to rotate -the chucks 3 and 5 and the bellows sections 19, and welding is carried out. In the course of welding9 heat removal is improved due to the presence of the projections 23 (Fig. 3). The welding being over, the swivel means 22 (Figs 2 and 4) are turned so as to open the split collar springs 20 and 21 (Fig. 3) and thus remove the welded bellows sections 19 from the split collar springs 20 and 21 To weld a new bellows section 19 to those already welded ;
:
. :
:~ `
~ .
- ~ - 15 2 ~ ~
together, the welding torch ~ ~ig. 7) i5 ~oved away from -the weldin~ position, and -the l~ovable support 6 (Fig, 1) is driven to its initial position, ~he~welded bellows sections 19 are ~oved -to the means 44 ~or receiving welded bellows sections.
~he surfaces of the rollers 45 of the means 44 are coated with polyf'luoroet~ylene resin, where~ore -the sur~ace o~ -the bellows section 19 is no-t de~ormed as it rotates and moves in -the lon-gitudinal direction. l`he foregoing sequence o~ events is then re-peated.
Tests haVe shown that the welder according to the inven-tion can produce high-quality welded join-ts when bu-tt-welding sec-tions of thin-walled bellows. r~his is due to -the fac-t that the bellows sections are accurately centered by -the expanding yoke, and that their edges are uni~ormly and ~irmly pressed together by the clip means mounted on the chucks and provided with split collar springs. Improved dissipation o~ heat due to the provi-sion o~ proaections on the end ~aces o~ the split collar springs 7 which are received in the recesses between -the corruga-tions o~
bellows sections, rules out burn-throughs. ~he welder accord-ing to the invention also rules out skewing o:~ bellows sections being welded in the weld plane and with respect to the long~i-tu-dinal axis o~ the bellows and -the welding head, which is due to the ~act that the bellows sec-tions are ~irmly pressed toge-ther by the symme-trically arranged pneumatic cylinders, and .
x -that the welding head is firmly locked in the welding position.
Due to the above combination o~ ~eatures, the welder o~
- this invention does not require any additional means to con-trol -the mutual positioning o~ -the torch and weld, which are normal-ly employed in butt welding of ~lexible proliled ar-ticles, such as bellows.
: '`
.
Claims (12)
1. A welder for welding sections of bellows, comprising:
a bed; a stationary support mounted on said bed; a rotatable driver chuck mounted on said stationary support; a movable support; a rotatable driven chuck mounted on said movable support with said movable support mounted on said bed for axial movement between a first position closely spaced from said driver chuck and a second position spaced a greater distance from said driver chuck, a bellows section to be welded being insertable between said chucks when said movable support is in said second position; a drive for rotating said driver chuck;
a gear train for providing kinematic coupling between said driver and driven chucks; a support mounted on said bed adjacent said driver chuck and carrying a welding torch; a plurality of pneumatic cylinders mounted between said bed and said movable support for moving said movable support between said first and said second positions, the cylinders being rigidly coupled to said movable support and arranged symmetrically with respect to the longitudinal axis of the welder; annular clip means mounted on each of said chucks and extending towards each other, one clip means per each chuck, one of said clip means being spring-loaded in the direction of its chuck; split collar springs mounted on said clip means, one split collar spring per each clip means, said split collar springs having pro-jections on their end faces to interact with respective recesses of corrugations of the bellows sections being welded;
an expanding yoke for centering outer diameters of bellows sections being welded, said yoke being mounted on said bed between said chucks and resting, when in a working position, on said split collar springs; and in engagement with the bellow sections to center said sections; two swivel means, each intended for tightening the respective split collar spring about said clip means so that said end face projections inter-act with the corrugations; adjustable stops mounted on said bed and interacting with said movable support for stopping said movable support in a position to perform the centering oper-ation, said adjustable stop being releasable to allow further movement of said movable support to said first position to effect clamping of said bellows sections about their entire periphery; and means for receiving welded bellows sections mounted on said bed behind said movable support.
a bed; a stationary support mounted on said bed; a rotatable driver chuck mounted on said stationary support; a movable support; a rotatable driven chuck mounted on said movable support with said movable support mounted on said bed for axial movement between a first position closely spaced from said driver chuck and a second position spaced a greater distance from said driver chuck, a bellows section to be welded being insertable between said chucks when said movable support is in said second position; a drive for rotating said driver chuck;
a gear train for providing kinematic coupling between said driver and driven chucks; a support mounted on said bed adjacent said driver chuck and carrying a welding torch; a plurality of pneumatic cylinders mounted between said bed and said movable support for moving said movable support between said first and said second positions, the cylinders being rigidly coupled to said movable support and arranged symmetrically with respect to the longitudinal axis of the welder; annular clip means mounted on each of said chucks and extending towards each other, one clip means per each chuck, one of said clip means being spring-loaded in the direction of its chuck; split collar springs mounted on said clip means, one split collar spring per each clip means, said split collar springs having pro-jections on their end faces to interact with respective recesses of corrugations of the bellows sections being welded;
an expanding yoke for centering outer diameters of bellows sections being welded, said yoke being mounted on said bed between said chucks and resting, when in a working position, on said split collar springs; and in engagement with the bellow sections to center said sections; two swivel means, each intended for tightening the respective split collar spring about said clip means so that said end face projections inter-act with the corrugations; adjustable stops mounted on said bed and interacting with said movable support for stopping said movable support in a position to perform the centering oper-ation, said adjustable stop being releasable to allow further movement of said movable support to said first position to effect clamping of said bellows sections about their entire periphery; and means for receiving welded bellows sections mounted on said bed behind said movable support.
2. A welder as claimed in claim 1, wherein said gear train comprises gears mounted on said chucks and interacting with respective gears mounted on a shaft installed in bearings provided in said bed.
3. A welder as claimed in claim 1, wherein each of said adjustable stops is composed of a pair of spring-loaded rods, each having a transverse through hole to receive a rack pro-vided with a drive for setting it in motion in the longitudinal direction and having slanted surfaces interacting with respec-tive slanted surfaces of the walls of the holes provided in said rods, said rods and rack being arranged in guides mounted on said bed.
4. A welder as claimed in claim 1, additionally provided with at least one pair of pneumatic cylinders arranged symm-etrically with respect to the horizontal and vertical planes extending through the longitudinal axis of the welder.
5. A welder as claimed in claim 1, comprising three pneumatic cylinders, said pneumatic cylinders being spaced at an equal distance from the longitudinal axis of said welder and at an equal distance from one another, and also arranged symmetrically with respect to the vertical plane extending through the longitudinal axis of the welder.
6. A welder as claimed in claim 1, wherein arranged in the plane of said yoke is the support carrying the welding torch, the support carrying a pneumatic cylinder with a rod extending through said cylinder which carries the welding torch at one end and a means for locking said torch in the welding position at its opposite end.
7. A welder as claimed in claim 1, wherein said means for receiving welded bellows sections comprises rollers spaced on a circular arc, their longitudinal axes being parallel to that of the welder.
8. A welder as claimed in claim 7, wherein the lateral surfaces of said rollers have a coating of polyfluoroethylene resin.
9. A method of fabricating a thin-walled tubular metal bellows composed of axially aligned bellows sections welded to one another at their circumferentially extending contiguous end surfaces, comprising placing the sections with their ends to be welded in confronting relationship, embracing adjacent end-portions of respective bellows sections with circumfer-entially extending spring collars, centering the spring collars, and thus the bellows ends, by tightening an expand-ible yoke around them, resiliently forcing together the opposed end surfaces of respective bellows sections by pres-sure applied by way of the collars while centred by the yoke, expanding the yoke to free it from the collars, rotating the bellows sections in synchronism about the axis on which they are centred to move their circumferentially extending con-tiguous end surfaces located between the collars progressively past a welding station which effects the welding, halting rotation of the sections after completion of the weld, and removing the collars from the welded-together sections.
10. A method as claimed in claim 9, in which the extent to which the collars can be moved towards one another during centering by the yoke is limited by stops which are displace-able to second positions at which they allow a predetermined further movement of the collars towards one another after the centering by the yoke has been carried out.
11. The method claimed in claim 10, in which the collars form parts of respective clip assemblies attached to respective opposed chucks which are connected for synchronous rotation, one of the chucks is mounted on a stationary support while the other is mounted on a movable support which displaces to produce the resilient force applied to the collars, and, after completion of a weld the welded-together bellows sections are moved axially through one of the supports.
12. The method claimed in claim 11, in which pneumatic piston and cylinders are used to displace the movable support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA309,860A CA1101245A (en) | 1978-08-23 | 1978-08-23 | Bellows sections welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA309,860A CA1101245A (en) | 1978-08-23 | 1978-08-23 | Bellows sections welder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101245A true CA1101245A (en) | 1981-05-19 |
Family
ID=4112190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA309,860A Expired CA1101245A (en) | 1978-08-23 | 1978-08-23 | Bellows sections welder |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1101245A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110370195A (en) * | 2019-08-14 | 2019-10-25 | 江苏欧朗汽车管路系统有限公司 | Clamping adjusting device is used in a kind of processing of automobile pipeline |
-
1978
- 1978-08-23 CA CA309,860A patent/CA1101245A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110370195A (en) * | 2019-08-14 | 2019-10-25 | 江苏欧朗汽车管路系统有限公司 | Clamping adjusting device is used in a kind of processing of automobile pipeline |
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