EP0042450B1 - Procédé pour la fabrication d'enveloppes de pots d'échappement à joint longitudinal plié et dispositif pour la réalisation de ce procédé - Google Patents

Procédé pour la fabrication d'enveloppes de pots d'échappement à joint longitudinal plié et dispositif pour la réalisation de ce procédé Download PDF

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Publication number
EP0042450B1
EP0042450B1 EP80103466A EP80103466A EP0042450B1 EP 0042450 B1 EP0042450 B1 EP 0042450B1 EP 80103466 A EP80103466 A EP 80103466A EP 80103466 A EP80103466 A EP 80103466A EP 0042450 B1 EP0042450 B1 EP 0042450B1
Authority
EP
European Patent Office
Prior art keywords
edges
mandrel
sheet metal
edge
blank
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
Application number
EP80103466A
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German (de)
English (en)
Other versions
EP0042450A1 (fr
Inventor
Joachim Bichel
Werner Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leifeld GmbH and Co
Original Assignee
Leifeld GmbH and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Leifeld GmbH and Co filed Critical Leifeld GmbH and Co
Priority to EP80103466A priority Critical patent/EP0042450B1/fr
Priority to AT80103466T priority patent/ATE4782T1/de
Priority to DE8080103466T priority patent/DE3065038D1/de
Publication of EP0042450A1 publication Critical patent/EP0042450A1/fr
Application granted granted Critical
Publication of EP0042450B1 publication Critical patent/EP0042450B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/108—Making tubes with riveted seams or with non-welded and non-soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/101—Making of the seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/105—Supply, or operations combined with supply, of strip material

Definitions

  • the invention relates to a method for producing mufflers of mufflers with a folded longitudinal seam, wherein a rectangular sheet metal plate is bent on two mutually parallel edges, bent around a mandrel in a U-shape, the longitudinal edges are brought together at the same time and then by driving over a tool carriage with several rollers once are bent to the seam and then the jacket is stripped from the mandrel and a device for carrying out this method with a device for folding the sheet metal plate on two parallel edges, a mandrel for bending the U-shaped plate, bending jaws for simultaneously bringing together the longitudinal edges of the plate , a tool trolley with several rollers for bending the seam and means for stripping the jacket from the mandrel.
  • a lever joint device (in particular FIG. 9) is also provided for the bending of the board, with which the U-shape is bent and the longitudinal edges of the board are then brought together at the same time.
  • These activities are performed by articulated levers and the bending jaws initially act as sliding jaws.
  • the actual bending process is still relatively unstable and therefore carried out inaccurately and the device is complex, prone to failure and limited in its working speed.
  • US-A-1 543460 it is also known to produce cans by bending the plate and executing the fold by means of a roller carriage.
  • a corresponding device cannot be used in the manufacture of mufflers, since very thin and easily bendable sheets are used in the production of tin cans, to which completely different requirements are to be placed than for the sheets of mufflers.
  • a transfer of the corresponding teaching is not obvious, since, in the known method, folding edges are also used, but the blanks are not bent at right angles, but rather to bevels, and the folding process is therefore carried out differently, corresponding to the completely different sheet material.
  • the mufflers should be particularly precise and have a perfectly uniform diameter over the length.
  • the method according to the invention and the device according to the invention should be suitable for also enabling the high-quality production of jackets from double sheets. Furthermore, the processing of stainless steel should also be possible, whereby lubrication of the sliding points can be largely avoided, which is very important for further processing.
  • Processing with a minimum of lubrication points or lubricant application is of course also an essential advantage of the invention when processing conventional, non-stainless steel sheets.
  • the bending of the sheets and the shaping of the tubular muffler body should be easier to control and optimize.
  • the switch should also be possible by untrained or trained personnel.
  • the above-mentioned object is achieved in that the blanks are bent upwards at right angles on both sides by folding jaws and then bent downwards, then transported under the mandrel, and for the U-shaped bending sliding jaws and separate bending jaws are provided for the subsequent joining of the folded edges are.
  • the invention is achieved in that the device has folding jaws for folding once upwards and downwards for another, and in that a conveying means for transporting the folded board in the middle under the mandrel, a pressure piston for pressing the board against the mandrel, lifting and lowering sliding jaws for U-shaped bending of the board and for bringing together the longitudinal edges of the board, the bending jaws are available separately.
  • the processing of two-layer or multi-layer sheets, which are connected to one another at one of their longitudinal edges, is advantageously achieved in that the sheet lying on the outside in the finished jacket at its free edge in relation to the inside protrudes as much as the circumferential difference between corresponds to the outer and the inner sheet, the outer sheet after clamping and possibly bending the connected edge with its free edge so far in the direction of the tensioned end with curvature of the outer sheet between the edges until the free edges of the outside - And inner sheet metal lie in a certain ratio above one another, the free edges of the sheet metal are clamped together and folded and after the tension has been released, the outer sheet rests against the inner sheet metal, the bent pieces at the free edge taking a distance from one another.
  • the corresponding device is advantageously constructed in accordance with the invention in such a way that it has two clamping jaws on both sides for clamping the edges of the board and one preferably upward and one preferably downward folding jaw, and that on one side there is a sliding jaw which protrudes the protruding edge of the outside Push the sheet to the edge of the inner sheet before the sheets are folded together on this edge.
  • the solution according to the invention allows the manufacture of mufflers for mufflers according to the requirements mentioned above with the simplest means, particularly short cycle times and thus particularly good machine utilization is possible, one can speak of an ideal solution to the problems at hand.
  • a board first runs into the device 1 for folding the two longitudinal edges of the board 3.
  • This device (Fig. And 7) can be used to bend boards made of one sheet or boards made of two sheets 3 and 3a.
  • this is clamped on both sides by the clamping jaws 22 and 23 on the one hand and the clamping jaws 24 and 25 on the other hand and the folding jaws 26 on the one hand and 27 on the other hand, the protruding sheet metal edges according to FIGS. 6 and 7 preferably edge up on the left side or down on the right.
  • the blank 3 thus pre-processed then runs over a conveyor track 33 and against a stop 30, so that it is ensured that, regardless of the size of each blank, the outermost edge at which the subsequent folding process will begin, as far as possible in the direction of the roller carriage 9 was advanced to make the fold seam.
  • the folding device 1 is equipped with a further sliding jaw 28.
  • the double-sheet board is at one of its longitudinal edges with a connection, for. B. welding of the two different sheets and this is clamped in accordance with FIGS. 6 and 7 on the right side and bent by the folding jaw 27 as described.
  • the outer, thinner sheet 3a protrudes from the thicker 3 by a distance by which the circumference of the outer sheet after rounding is greater than that of the inner sheet 3.
  • the thinner outer sheet 3a is now pushed back with its edge by the sliding jaw 28 until this edge is in a certain relationship to the outer edge of the sheet 3 and the sheet bends slightly according to FIG. 6.
  • the protruding edge is then preferably bent upwards by the folding jaw 26 as described above, and after loosening the clamping jaws 22 and 23, the lower sheet 3a is pushed by a small, as shown in FIG. projecting piece 29 before.
  • both the span between the two folding sides of the folding device 1 and the position of the stop 32 can be changed in the simplest way, so that sheets of various widths and lengths can be processed with minor changes.
  • the conveyor tracks 33 and 34 are preferably designed as walking beam tracks.
  • the board 3 After the board 3 has run in under the mandrel 4 with the bends already made, the board is fixed relative to the mandrel by raising the piston of the cylinder-piston arrangement 5. Then the sliding jaws 6a and 6b are lifted simultaneously and now bend the plate 3 in the shape of a U. 'The mandrel 4 and the height adjustment of the parts 5, 6a and 6b can also be changed in a simple manner, so that mufflers for mufflers are readily available various diameters or different, rounded shape, for. B. elliptical, oval and the like can be produced.
  • the mandrel 4 is divided into at least two halves, 4a and 4b and between the halves there are spreading elements, e.g. B. a wedge with which the parts of the mandrel 4 during the machining process, d. H. the bending and folding, can be spread apart. After the folding is finished, the spread is withdrawn and thus the friction when pushing the jacket off the mandrel is decisively prevented, which could otherwise easily damage the board 3.
  • the division can also be triple.
  • the board which now occupies a position according to the broken line in FIG. 8, is now evenly joined together with its folded edges over its entire length. presses.
  • the device according to the invention has bending jaws 7, each of which can be pivoted via a piston-cylinder arrangement 8, and when the bending jaws 7 are retracted, the sheet or plate is now brought into the position according to FIG. 7, which is ensured by the bending jaws 7 that the sheet metal edges are in an absolutely parallel position to each other.
  • the jacket therefore also has a cross-sectional shape which is uniform over its length.
  • a roller carriage 9 is arranged next to the area of the mandrel 4 in the device according to the invention, which carries a number of downwardly directed rollers 10-21, the rollers 10-19 each being arranged in pairs and acting laterally.
  • rollers are combined in a roller carriage 9, which can be exchanged as a unit when the shape of the seam is changed or, if necessary, also when the diameter of the casing to be manufactured is changed and thus when the width of the seam is changed.
  • the roles can therefore be exchanged by untrained personnel - the same also applies to the above-described adaptation of the device according to the invention to a wide variety of sheet widths, i. H. Diameter and sheet lengths, d. H. Jacket lengths.
  • the upright bend is placed on the mandrel 4 by the roller 10 and at the same time the downward bend is pressed down by the roller 1.
  • the following pair of rollers 12 and 13 places the upright bevel in an inclined position, while at the same time the material of the board is brought parallel to the downward beveled up to the edge of the upright bevel.
  • roller pairs 14, 15; 16, 17 and 18, 19 a bending of the downward-pointing fold to the upward-pointing fold and a bending around it.
  • the rollers 20 and 21 are arranged in the roller carriage as seen in the direction of travel, which apply the fold to the jacket or recalibrate the fold.
  • the jacket can then be stripped off by means of a hook attached to the roller carriage when the roller carriage returns.
  • the roller carriage is controlled so that it interrupts its overflow when the latter of the rollers, 21, has overflowed the end of the jacket. Since the approach of the stop 30 has already chosen that the edge of the profile to be folded is directly in front of the first roller 10, the length of movement of the roller carriage 9 is thus kept as short as possible, so that the cycle times of the machine can be optimally high and so that maximum machine utilization can be achieved. Since only a much smaller number of rolls are used than in the known prior art, the rolls can also have a greater distance from one another than previously used, and this also improves the quality of the fold, since the various influences of the rolls no longer act to the next point of engagement can.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Exhaust Silencers (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Claims (9)

1. Procédé de fabrication d'enveloppes de pots d'échappement comportant un joint longitudinal plié, suivant lequel une plaque rectangulaire de tôle (3) est bordée sur deux bords parallèles entre eux, et cintrée en forme de U autour d'un mandrin (4), puis les bords longitudinaux sont simultanément rapprochés et, ensuite, par un seul passage d'un chariot porte-outil (6) comportant plusieurs galets (10-21), ils sont cintrés sous la forme d'un joint plié et ensuite l'enveloppe est éjectée du mandrin (4), caractérisé en ce que les plaques (3) sont bordées des deux côtés à angle droit par des mâchoires de bordage (26, 27) d'une part vers le haut et, d'autre part, vers le bas, puis elles sont transportées en dessous du mandrin (4) et en ce qu'il est prévu, pour le cintrage en forme de U, des mâchoires de glissement (6a, 6b) et, pour la jonction ultérieure des bords tombés, des mâchoires de pliage spéciales (7).
2. Procédé selon la revendication 1, pour le conditionnement de tôles (3, 3a) à deux couches qui sont liées entre elles le long d'un des bords à tomber, caractérisé en ce que la tôle (3a) située à l'extérieur dans l'enveloppe finie dépasse, sur son bord libre, par rapport à la tôle située à l'intérieur (3) d'une distance correspondant à la différence entre les périmètres de la tôle placée à l'extérieure et de la tôle placée à l'intérieur, en ce que la tôle extérieure (3a) est déplacée, après le serrage unilatéral et, le cas échéant, le bordage du bord associé, avec son bord libre en direction de l'extrémité serrée, avec incurvation de la tôle extérieure (3a), jusqu'à ce que les bords libres de la tôle extérieure et de la tôle intérieure soient situés l'un au-dessus de l'autre dans une relation déterminée, en ce que les bords libres des tôles sont ensuite serrés ensemble et sont bordés, et en ce que, après suppression du serrage, la tôle extérieure s'applique à nouveau contre la tôle intérieure, les parties marginales pliées, s'écartant l'une de l'autre sur le bord libre.
3. Procédé selon la revendication 1, caractérisé en ce que la plaque est transportée, après le bordage, dans une direction parallèle aux bords tombés indépendamment de la grosseur de la plaque conditonnée jusque dans une position déterminée du bord avant, puis elle est engagée, perpendiculairement à la première voie de mouvement et en direction du bord tombé, en dessous du mandrin.
4. Procédé selon l'une revendications 1 à 3, caractérisé par les étapes suivantes de formage pour la réalisation du joint plié par passage de galets après le rapprochement des bords:
a) Application du bord tombé dirigé vers le haut sur le mandrin et poussée simultanée vers le bas du bord tombé dirigé vers le bas (Fig. 9).
b) Mise en oblique du bord tombé dirigé vers le haut et cintrage simultané de la matière parallèlement et à côté du bord tombé dirigé vers le bas jusqu'à l'application contre la lisière du bord tombé dirigé vers le haut (Figure 10).
c), d), e) Pliage du bord tombé dirigé vers le bas vers et autour du bord tombe dirige vers le haut en trois étapes (Figures 11, 12, 13).
f) Application du pli contre l'enveloppe arrondie (Figure 14), et
g) Calibrage du pli.
5. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 à 4, comportant un équipement (1) pour effectuer le bordage de la plaque de tôle (3) sur deux bords parallèles, un mandrin (4) pour cintrer la tôle en forme de U, des mâchoires de cintrage (7) pour rapprocher simultanément les bords longitudinaux de la plaque, un chariot porteoutil (6) comportant plusieurs galets (10-21 ) pour le cintrage du joint plié et des moyens pour éjecter l'enveloppe du mandrin (4), caract erisée en ce quel'équipement (1) comporte des mâchoires de bordage (26, 27) pour assurer le bordage, d'une part, vers le haut et, d'autre part, vers le bas et en ce qu'il est prévu un moyen transporteur (33, 34) pour le transport de la plaque bordée (3) au milieu et en dessous du mandrin (4), un piston d'application (5) pour appliquer la plaque (3) contre le mandrin (4), des mâchoires de glissement (6a, 6b) pouvant exécuter des mouvements de montée et de descente por le cintrage en forme de U de la plaque (3) et en ce que, pour le rapprochement des bords longitudinaux de la plaque, il est prévu des mâchoires de cintrage (7) spéciales.
6. Dispositif selon la revendication 5, caractérisé en ce qu'il comporte de chaque côté respectivement deux mâchoires de serrage (22, 23 et 24, 25) pour le serrage des bords de la plaque et, avantageusement, une mâchoires de bordage opérant vers le haut (26) et une mâchoire de bordage opérant vers le bas (27), et en ce qu'il est prévu d'un côté une mâchoire de poussée (28) qui pousse le bord en dépassement (29) de la tôle placée à l'extérieur (3a) dans une relation déterminée jusque sur le bord de la tôle située à l'intérieur (3) avant que les tôles ne soient bordées en commun sur ce bord après le serrage.
7. Dispositif selon l'une des revendications 5 et 6, caractérisé en ce qu'il comporte une butée (30) ainsi qu'une première voie de transport (33) pour transporter la plaque du dispositif de bordage (1) jusque contre la butée (30) dans une direction parallèle aux bords tombés de la plaque ainsi qu'une seconde voie transporteuse (34) qui est disposée à angle droit par rapport à la première voie transporteuse (33) pour le transport de la plaque en dessous du mandrin (4) jusqu'à une butée (32).
8. Dispositif selon l'une des revendications 5 à 7, caractérisé en ce que le mandrin (4) est divisé longitudinalement en au moins deux parties (4a, 4b) et comporte des moyens (non représentés) pour écarter les parties de mandrin l'une par rapport à l'autre et pour les rapprocher l'une de l'autre.
9. Dispositif selon l'une des revendications 5 à 8, caractérisé en ce que les galets (10-21) sont fixés de façon réglable sur un chariot (9) dont le mouvement parallèlement à l'axe du mandrin (4) est réglable en longueur de telle sorte que le dernier galet (21), en considérant le sens de déplacement, revienne, également lors de la fabrication d'enveloppes de faible longueur, seulement d'une certaine distance jusqu'à l'extrémité de l'enveloppe.
EP80103466A 1980-06-21 1980-06-21 Procédé pour la fabrication d'enveloppes de pots d'échappement à joint longitudinal plié et dispositif pour la réalisation de ce procédé Expired EP0042450B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP80103466A EP0042450B1 (fr) 1980-06-21 1980-06-21 Procédé pour la fabrication d'enveloppes de pots d'échappement à joint longitudinal plié et dispositif pour la réalisation de ce procédé
AT80103466T ATE4782T1 (de) 1980-06-21 1980-06-21 Verfahren zur herstellung von maenteln fuer auspufftoepfe mit einer gefalzten laengsnaht und vorrichtung zur durchfuehrung dieses verfahrens.
DE8080103466T DE3065038D1 (en) 1980-06-21 1980-06-21 Process for producing silencer cases with a folded longitudinal seam and apparatus for carrying out this process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80103466A EP0042450B1 (fr) 1980-06-21 1980-06-21 Procédé pour la fabrication d'enveloppes de pots d'échappement à joint longitudinal plié et dispositif pour la réalisation de ce procédé

Publications (2)

Publication Number Publication Date
EP0042450A1 EP0042450A1 (fr) 1981-12-30
EP0042450B1 true EP0042450B1 (fr) 1983-09-28

Family

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Application Number Title Priority Date Filing Date
EP80103466A Expired EP0042450B1 (fr) 1980-06-21 1980-06-21 Procédé pour la fabrication d'enveloppes de pots d'échappement à joint longitudinal plié et dispositif pour la réalisation de ce procédé

Country Status (3)

Country Link
EP (1) EP0042450B1 (fr)
AT (1) ATE4782T1 (fr)
DE (1) DE3065038D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4235629C2 (de) * 1992-10-22 1996-01-25 Peter Knoll Vorrichtung zum Profilieren und bzw. oder ggf. Schneiden von Blechen
GB9816074D0 (en) * 1998-07-24 1998-09-23 Eagle Precision Tech Tubular product formation
CN104646459A (zh) * 2013-11-20 2015-05-27 铜陵市大成轧辊有限责任公司 法兰压制装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888413A (en) * 1930-03-13 1932-11-22 Arthur H Parker Method of making alpha can

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7324077U (de) * 1973-09-27 Asdorfer Eisenwerk Gmbh Biegevorrichtung zum Rundbiegen von Blechzuschnitten, insbesondere zu Rohrschüssen
US1543460A (en) * 1922-01-26 1925-06-23 Seattle Astoria Iron Works Can-body-forming machine
US1588413A (en) * 1925-03-06 1926-06-15 Henry A Hardy Ice-cream dipper
US2212715A (en) * 1938-01-26 1940-08-27 Excel Curtain Company Method of and machine for forming tubing
US2644416A (en) * 1949-02-02 1953-07-07 Oldberg Mfg Company Apparatus for forming tubes
US3369568A (en) * 1964-06-23 1968-02-20 Grace W R & Co Side seam seal for metal containers
US3495065A (en) * 1968-07-05 1970-02-10 Tagers Gmbh Fa Process for electrical resistance-welding of overlapping sheets
US3672317A (en) * 1971-02-19 1972-06-27 Export Tool & Welding Co Ltd Metal spinning machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888413A (en) * 1930-03-13 1932-11-22 Arthur H Parker Method of making alpha can

Also Published As

Publication number Publication date
DE3065038D1 (en) 1983-11-03
ATE4782T1 (de) 1983-10-15
EP0042450A1 (fr) 1981-12-30

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