EP0645200B1 - Machine d'étirage des barres - Google Patents

Machine d'étirage des barres Download PDF

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Publication number
EP0645200B1
EP0645200B1 EP94114476A EP94114476A EP0645200B1 EP 0645200 B1 EP0645200 B1 EP 0645200B1 EP 94114476 A EP94114476 A EP 94114476A EP 94114476 A EP94114476 A EP 94114476A EP 0645200 B1 EP0645200 B1 EP 0645200B1
Authority
EP
European Patent Office
Prior art keywords
assembly
machine
chains
bar
links
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94114476A
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German (de)
English (en)
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EP0645200A1 (fr
Inventor
Enzo Coccolo
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.)
Danieli and C Officine Meccaniche SpA
Danieli Centro Maskin SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
Danieli Centro Maskin SpA
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Publication date
Application filed by Danieli and C Officine Meccaniche SpA, Danieli Centro Maskin SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP0645200A1 publication Critical patent/EP0645200A1/fr
Application granted granted Critical
Publication of EP0645200B1 publication Critical patent/EP0645200B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/27—Carriages; Drives
    • B21C1/30—Drives, e.g. carriage-traversing mechanisms; Driving elements, e.g. drawing chains; Controlling the drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21L—MAKING METAL CHAINS
    • B21L11/00—Making chains or chain links of special shape
    • B21L11/10—Making chains or chain links of special shape the chain links having opposed correspondingly shaped cylindrical and hook-like parts of which one parts forms a hinge-like support for the adjacent link

Definitions

  • This invention concerns a machine to draw bars, as set forth in the preamble of the main claim.
  • Such a bar drawing machine consists substantially of a drawing assembly which comprises a pair of opposed contrarotating chains of the type disclosed in EP-A-548723, for instance, and is positioned downstream of a drawplate or die.
  • Such a drawing machine is applied in the field of continuous straight drawing of metallic bars or tubes.
  • Drawing machines of the state of the art consist of an element called a die to reduce the section of the product being drawn and of means which are positioned downstream of the drawplate die and are suitable to carry out lengthwise drawing of the bar to be drawn.
  • An initial segment of the bar to be drawn is prepared with a cross-section smaller than the size of the die, so that in an initial step this segment can be passed through the die and be attached to the drawing assembly.
  • the continuous drawing means comprising the drawing assembly generally consist of a device comprising two opposed chains or tracks, which consist of a series of links to which are fitted the blocks or grippers that act on the two opposite sides of the segment of bar which has already been passed through the die.
  • the state of the art includes devices suitable to adjust the distance between centres of the drawing chains in relation to the drawing axis so as to ensure efficient clamping of the bar to be drawn during each working step.
  • US-A-2,797,798 discloses a drawing assembly in which the adjustment of the distance between centres of the chains is carried out by means of a first mechanical pressure applied directly to the tracks and a second pressure with use of a fluid, this second pressure too being applied directly to the tracks.
  • the mechanical pressure is performed by using wedge means, which are brought to apply pressure to the tracks.
  • This embodiment is very complex from constructional and working points of view, is bulky and also acts substantially on the axes of the sprocket wheels about which the chains rotate. Moreover, the double system of acting mechanically and with a fluid, whereby each system acts on separate parts of the machine, creates lack of homogeneity of actuation and problems of control, adjustment and coordination.
  • EP-A-433767 discloses a drawing assembly for a drawing machine in which the device to adjust the distance between centres of the chains acts directly on the plates bearing the chains and on their position.
  • This document includes a motor which drives a pair of threaded shafts associated with the respective chains by means of respective nut screw assemblies and bush assemblies.
  • the chain When adjustment is necessary, the chain is brought to its position by adjusting, at a right angle to the drawing axis by means of the threaded shafts, the position of the chains in relation to the drawing axis.
  • This system although very effective in principle, has been found, when applied, to be not strong and reliable enough and leads to problems of wear and requires constant and continuous maintenance, above all when the performance required of the machine is at its upper limit. Moreover, this system does not provide for the ability to adjust in a differentiated manner separate zones of the drawing path within the drawing assembly.
  • the adjustment is established on the basis of the nominal diameter of the bar and is possibly corrected only when the drawing section is changed or when obvious difference are found between the actual diameter and the nominal diameter.
  • the bar to be drawn should include a segment of a cross-section such that it can be passed through the drawplate die and is long enough to be attached efficiently to the drawing assembly of the drawing machine.
  • leading end segment of the bar with a reduced cross-section is generally readied in two steps.
  • a first auxiliary operation carried by a suitable machine for sharpening to a point prepares a first leading pointed segment of a modest length.
  • the thrust applied to the bar requires a force which has an effect on the power installed on the machine.
  • the document US-3,945,547 shows a drawing assembly composed of two opposed facing chains between which the tubular bar to be drawn is inserted.
  • These chains consist of a plurality of drawing elements, each of which has at the forward part a gripper element made of wear-resistant material which acts on the tubular bar, and at the rear part a toothed element which engages on the cog wheel which drives the chain.
  • US'547 teaches to include, inside each of the gripper elements, a permanent magnet which keeps the gripper element and the toothed element joined together, so as to allow a quick and easy substitution of the gripper elements.
  • US'547 includes spring means suitable to give resilient contrast to the chains when they grip the bar to be drawn, and stationary means to define and set the initial reciprocal position of the chains.
  • This document does not include means to adjust, both continuously and during the drawing process, the locking pressure of the chains on the bar to be drawn according to the requirements identified during the process.
  • the purpose of the invention is to provide a drawing machine in which the adjustment of the distance between centres of the drawing chains or tracks according to variations in the diameter of the bar being processed or in the section of the die can be achieved substantially with. one single operation with very simple methods.
  • Another purpose of the invention is to be able to adjust the force of closure of the chains substantially continuously according to the drawing force which is measured at the drawplate and to which the bar is subjected.
  • Yet another purpose of the invention is to produce on a bar to be drawn a long enough segment of a reduced cross-section by using the die itself and thus without requiring external auxiliary operations which impair the quality of the segment having a a reduced cross-section.
  • a further purpose of the invention is to achieve this reduction of cross-section by drawing and not by thrusting.
  • a drawing machine 10 shown as a whole in Fig.6 comprises a drawing assembly 11 positioned downstream of a drawplate 12 in the direction of feed of bars 14 to be drawn.
  • the drawing assembly 11 is of the type disclosed in EP-A-548723 and comprises two opposed, contrarotating chains 13-113 arranged on the same plane in the vicinity of the drawing axis 15.
  • the chains 13-113 rotate about respective sprocket wheels 16 and face each other along a segment which defines the drawing path within the drawing assembly 11 along the drawing axis 15.
  • Each of the chains 13-113 consists of a plurality of links 44; these links 44 include at one end a male element 54 and at their other end a female seat 55, which cooperates with the coordinated male element 54 of the adjacent link 44 (see Fig.12).
  • the links 44 are connected together by small lateral plates 52 arranged at each side of the links 44 and fixed to connecting pivots 56 of the links 44.
  • the connecting pivots 56 are positioned at a substantially intermediate position symmetrical in relation to the link 44 in question.
  • the small lateral plates 52 are shown with lines of dashes in Fig.4.
  • the chains 13-113 cooperate with respective stationary rigid guides 43 in producing by interaction a pressure of closure, perpendicular to the drawing axis 15, on the bar 14 to be drawn.
  • a series of idler rolls 38 installed in a succession of articulated cages 25 is included between the chains 13-113 and the respective rigid guides 43; these idler rolls 38 in the drawing zone are positioned between the links 44 of the respective chain 13-113 and the respective rigid guide 43 so as to reduce friction.
  • the idler rolls 38 cooperate with the inner surface of the respective chains 13-113 and are moved by a drawing action of the links 44 so that they move at a speed which is half of that of the chains 13-113.
  • Fig.10 the series of idler rolls 38 with their respective articulated linked cages 25 is shown in an enlarged scale in greater detail.
  • Fig.11 shows a section of two of the articulated linked cages 25.
  • the articulated linked cage 25 consists of a substantially square or rectangular frame 36 consisting of two half-links 36a-36b connected along their axes 37 so as to enable two rolls 38 to be inserted in this case.
  • the frame 36 has a substantially H-shaped cross-section (Fig.13).
  • the rolls 38 may be of a solid type or, according to an evolutive variant, of a resilient type.
  • the linked cages 25 are connected together by pivots 39 which can oscillate partly within their seats to ensure that one linked cage 25 can rotate in relation to the adjacent cage 25.
  • the rolls 38 have the purpose of apportioning correctly the pressure necessary between the rigid guide 43 and the respective chains 13-113 for the drawing action; that pressure is discharged at a right angle to the rigid guide 43 and substantially at the centre line thereof.
  • Half-clamps 45 are fitted to the links 44 of the upper chain 13 and cooperate with mating half-clamps 45 fitted to the links 44 of the lower chain 113 so as to grip the bar 14 to be drawn.
  • the half-clamps 45 are anchored to the respective links 44 by making the dovetail profile 48 of the links 44 cooperate with the inclined-plane profile 51 of the half-clamps 45.
  • the links 44 include means for the quick attachment and release of the relative half-clamps 45.
  • the quick attachment and release means consist of lateral catches 61 which secure the respective half-clamp 45 in position; at least one of the two lateral catches 61 includes resilient release means such as a pin 62, with a spring for instance.
  • the half-clamps 45 include a hollow 49, which in this case is semi-circular and has a profile shaped according to the profile of the bar being processed, and also include lead-in bevels 50 to assist entry and exit of the bar 14 and to facilitate the initial gripping and release of the bar 14 to be drawn (Fig.5).
  • the chains 13-113 are installed on respective upper 27 and lower 127 supporting plates, or track-holders, at the ends of which are fitted the sprocket wheels 16.
  • the drawing assembly 11 includes means to adjust the distance between centres of the chains 13-113 in relation to the drawing axis 15.
  • the drawing assembly 11 comprises a downstream adjustment assembly 59a and an upstream adjustment assembly 59b considered in relation to the direction of drawing 60.
  • This adjustment of the distance between centres is required, in the step of starting the drawing for instance, so as to obtain the insertion and clamping of a new bar 14 to be drawn without any risk of collisions or impacts.
  • the adjustment has the further purpose of adapting the drawing assembly 11 to variations in size of the diameters of the bars 14 and of ensuring a constant pressure of closure of the chains 13-113 according to the drawing force measured at the drawplate 12.
  • the adjustment is performed by acting directly on the upper 27 and lower 127 supporting plates and thus adapting and adjusting the position of the whole structure according to the working requirements.
  • each supporting plate 27-127 of the chains 13-113 comprises two lodgement seats 58 associated respectively with respective supporting pivots 28-128.
  • Each pivot 28-128 is associated eccentrically with a relative cylindrical toothed wheel 30-130 by means of a respective small actuation shaft 29.
  • a left upper toothed wheel 30a there are a left upper toothed wheel 30a, a right upper toothed wheel 30b, a left lower toothed wheel 130a and a right lower toothed wheel 130b.
  • the left upper and lower pivots 28a and 128a together with the respective small actuation shafts 29 and left upper and lower toothed wheels 30a and 130a form the downstream adjustment assembly 59a
  • the right upper and lower pivots 28b and 128b together with the respective small actuation shafts 29 and right upper and lower toothed wheels 30b and 130b form the upstream adjustment assembly 59b.
  • All the cylindrical toothed wheels 30-130 are connected together kinematically in this case, or directly, or by means of a gearwheel 31.
  • Actuation of the toothed wheels 30-130 in this case is performed by two hydraulic cylinder/piston actuators 32. These hydraulic actuators 32 in this case adjust the pressure of closure of the chains 13-113 against the bar 14 to be drawn according to the drawing force measured on the drawplate 12.
  • a toric load cell 33 is included on the base plate 34 supporting the drawing assembly 11 substantially in cooperation with the position of abutment of the drawplate 12 in its normally drawing position 12b.
  • the load cell 33 governs a unit 57 actuating and controlling the hydraulic actuators 32 and establishes the variation of the pressure of closure of the chains 13-113 according to the drawing force measured on the drawplate 12.
  • the load cell 33 measures the strength of the pressure with which a support 47 of the die 46 of the drawplate 12 is drawn against an abutment ring 42 placed facing the load cell 33 on the base plate 34 (Fig.8).
  • the actuation of the toothed wheels 30-130 causes, in one direction or the other, the respective raising or lowering of the upper supporting plates 27 and therefore the whole upper structure and also the corresponding lowering or raising of the lower supporting plates 127 and therefore the whole lower structure.
  • the gearwheel 31 can be disconnected, thus permitting an adjustment differentiated as between one side and the other side of the chains 13-113.
  • At least one eccentric pivot 28 or 128 includes a lever 53 which cooperates with an adjustable stop 35 to govern maximum closure of the chains 13-113.
  • the bars 14 are fed to the drawing machine 10 with a small leading end segment 24 having a reduced cross-section such as to be able to pass through the die 46.
  • This segment 24 of a reduced corss-section has a length sufficient to enable the segment 24 to be clamped by grippers 17 located immediately downstream of the drawplate 12 when the drawplate 12 is in its normal drawing position 12b (shown with lines of dashes in Fig.6).
  • the grippers 17 are immovably installed on the base plate 34 to which the drawing assembly 11 is fitted.
  • the grippers 17 are in their open position (Fig.9) when the bar 14 is inserted.
  • the drawplate 12 is fitted to a carriage 18 able to move along the drawing axis 15 in relation to the base plate 34.
  • the carriage 18 is installed on cross members 19-20 which are solidly fixed to a platform 21, which can be displaced axially along the drawing direction by action of a first jack 22.
  • the die-holder carriage 18 is thus retracted in the direction of backward drawing to produce a required segment of bar of a reduced cross-section, this cross-section being equal to the cross-section to be drawn.
  • the backward displacement of the drawplate 12 is carried out along a travel equal to "l" in this case.
  • the length "l” corresponds substantially to the length required for a segment 40 of a reduced cross-section able to ensure an efficient gripping by the drawing assembly 11 and therefore to achieve excellent drawing conditions.
  • Pincers fitted to the die-holder carriage 18, for instance, may be included and be actuated on the bar 14 in this step.
  • the drawplate 12 with the die 48 is moved to rest on the base plate 34 against the abutment ring 42 in the normal drawing position 12b.
  • the downstream segment 40 made by backward drawing of the bar 14 is positioned between the chains 13-113 of the drawing assembly 11.
  • the drawing machine 10 is now ready to start the drawing operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Turning (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Claims (10)

  1. Machine pour étirer des barres, comprenant un ensemble de filière d'étirage et un ensemble d'étirage associé (11), l'ensemble d'étirage comprenant deux chaínes sans fin (13, 113) installées sur une plaque de support supérieure (27) et une plaque de support inférieure (127) respectivement et disposées de part et d'autre d'un chemin d'étirage, chaque chaíne comprenant une série de maillons (44) pourvus de blocs de pinçage (45) pour pincer la barre étirée en agissant sur les deux côtés opposés du segment de barre qui a été passé à travers la filière d'étirage (12), la distance entre les deux ensembles de chaínes pouvant être réglée à l'aide de moyens de réglage rotatif (59a, 59b) afin de modifier de manière réciproque la distance entre les blocs de pinçage (45) définissant le chemin d'étirage, l'ensemble d'étirage comprenant, en outre, des moyens (16) pour entraíner les chaínes (13, 113) en rotation continue, le sens de rotation de la première chaíne étant opposé au sens de rotation de l'autre chaíne, la machine comprenant, en outre, des pinces (17) en aval de la filière d'étirage (12), des moyens pour actionner momentanément les pinces (17) afin de pincer un segment de barre initial de section transversale réduite qui traverse la filière d'étirage (12), et un premier moyen d'actionnement à vérin (22) pour effectuer un déplacement relatif entre les pinces (17) et la filière d'étirage (12), caractérisée en ce que la machine comprend une capsule dynamométrique torique (33) qui est disposée d'une manière telle qu'elle soit capable de mesurer la force d'étirage exercée pendant l'étirage par la barre sur la filière d'étirage (12), la capsule dynamométrique (33) coopérant à cet effet avec le support (47) de la filière d'étirage (12), la capsule dynamométrique (33) étant associée à une unité de commande (57) destinée à commander des moyens d'actionnement (32) entraínant des moyens de réglage (59a, 59b) d'une manière propre à régler la pression de serrage exercée par les blocs de pinçage (45) sur les chaínes (13, 113) sur les côtés opposés de la barre en fonction de la force d'étirage mesurée et en ce que les pinces (17) sont incluses dans l'ensemble de filière d'étirage, la filière d'étirage (12) étant montée sur un chariot (18) qui, à l'intervention du premier moyen d'actionnement à vérin (22) peut être déplacé le long de l'axe d'étirage entre une position dans laquelle la filière d'étirage (12) est proche des pinces (17) et une position dans laquelle la filière (12) est distante de ces pinces.
  2. Machine à étirer suivant la revendication 1, dans laquelle l'ensemble pour le réglage réciproque des ensembles de chaínes (13-113) comprend la plaque de support de chaíne (27-127) de chaque ensemble de chaíne (13-113) qui présente, dans une position intermédiaire sensiblement symétrique entre les roues à chaíne de transmission amont et aval (16), deux sièges (58) qui sont chacun associés à un pivot excentrique (28-128) de son propre arbre d'actionnement (29), les deux pivots excentriques (28-128) définissant des moyens de réglage d'aval (59a) et d'amont (59b) respectifs, vu par rapport à la direction d'étirage (60), chaque arbre d'actionnement (29) étant relié rigidement à une roue dentée cylindrique (30-130), les roues dentées cylindriques (30a-130a) du moyen de réglage d'aval (59a) et les roues dentées cylindriques (30b-130b) du moyen de réglage d'amont (59b) étant respectivement accouplées.
  3. Machine à étirer suivant la revendication 2, dans laquelle l'accouplement entre les deux paires de roues dentées cylindriques (30-130) respectivement associées aux moyens de réglages d'aval (59a) et d'amont (59b) comprend une roue dentée intermédiaire (31) pour la coordination du mouvement angulaire.
  4. Machine à étirer suivant la revendication 2 ou 3, dans laquelle au moins un pivot excentrique (28-128) d'au moins un des moyens de réglage d'aval (59a) est associé rigidement à un levier (53) coopérant avec une butée réglable (35).
  5. Machine à étirer suivant l'une quelconque des revendications précédentes, dans laquelle l'ensemble de liaisons comprend une pluralité de rouleaux (38) comprenant des cadres de confinement de rouleaux (36) associés à des cages (25) reliées les unes aux autres en succession en une boucle sans fin.
  6. Machine à étirer suivant la revendication 5, dans laquelle le cadre de confinement de rouleaux (36) a une section transversale en substance en forme de "H", le "H" étant disposé sur un de ces côtés.
  7. Machine à étirer suivant la revendication 5 ou 6, dans laquelle le cadre de confinement de rouleaux (36) comprend des sièges de configuration sensiblement cylindrique disposés perpendiculairement à l'axe longitudinal (37) de la cage (25), chaque cadre (36) contenant deux sièges cylindriques.
  8. Machine à étirer suivant l'une quelconque des revendications précédentes, dans laquelle les maillons (44) des chaínes (13-113) comprennent de petites plaques latérales de confinement et de guidage (52), les maillons (44) étant pourvus d'un élément mâle (54) à une extrémité et d'un siège femelle coordonné (55) à l'autre extrémité, les pivots de liaison (56) se trouvant dans une position intermédiaire sensiblement symétrique.
  9. Machine à étirer suivant l'une quelconque des revendications précédentes, dans laquelle les maillons (44) ont, dans une position géométrique intermédiaire dans le sens longitudinal, coordonnée avec la position des pivots de liaison (56), un siège (48) destiné à loger un bloc de pinçage (45) qui assure le pinçage et l'étirage de la barre (14).
  10. Machine à étirer suivant l'une quelconque des revendications précédentes, dans laquelle les maillons (44) comprennent des moyens (61-62) pour permettre un ancrage et une libération rapides des blocs de pinçage (45).
EP94114476A 1993-09-29 1994-09-14 Machine d'étirage des barres Expired - Lifetime EP0645200B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUS930200 1993-09-29
ITUS930200 1993-09-29

Publications (2)

Publication Number Publication Date
EP0645200A1 EP0645200A1 (fr) 1995-03-29
EP0645200B1 true EP0645200B1 (fr) 1998-01-28

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EP94114476A Expired - Lifetime EP0645200B1 (fr) 1993-09-29 1994-09-14 Machine d'étirage des barres

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Country Link
EP (1) EP0645200B1 (fr)
AT (1) ATE162742T1 (fr)
DE (1) DE69408239T2 (fr)
ES (1) ES2111225T3 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP4245434A1 (fr) 2022-03-17 2023-09-20 SMS group GmbH Procédé de traction à chenilles et machine de traction à chenilles

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DE19636322C1 (de) * 1996-08-29 1998-01-15 Mannesmann Ag Verfahren und Vorrichtung zum Einfädeln von Rohren in eine Ziehvorrichtung
DE19637686C1 (de) * 1996-09-06 1998-01-29 Mannesmann Ag Vorrichtung und Arbeitsverfahren zum Einfädeln von Rohren oder Stangen in ein Ziehaggregat
US5921128A (en) * 1996-12-17 1999-07-13 Mannesmann Aktiengesellschaft Method and apparatus for cold rolling tubes
DE19711101C1 (de) * 1997-03-07 1998-04-23 Mannesmann Ag Kettenziehmaschine zum kontinuierlichen Ziehen von Stangen und Rohren
IT1310892B1 (it) * 1999-08-26 2002-02-22 Danieli Ct Maskin Spa Cingolo per gruppo di traino di macchine trafilatrici
IT1310893B1 (it) * 1999-08-26 2002-02-22 Danieli Ct Maskin Spa Catena ausiliaria per gruppo di traino di macchine trafilatrici
DE10134949A1 (de) * 2001-07-23 2003-02-06 Schumag Ag Ziehmaschine zum kontinuierlichen Ziehen von Ziehgut
RU2475318C1 (ru) * 2011-09-21 2013-02-20 Владимир Николаевич Стазаев Промежуточное тяговое устройство в.н. стазаева
EP3089835B1 (fr) * 2014-01-03 2018-03-28 Danieli & C. Officine Meccaniche, S.p.A. Chaîne intermédiaire pour assemblages d'étirage de machines d'étirage
CN104550314A (zh) * 2014-10-23 2015-04-29 苏州奥智机电设备有限公司 管件或杆件变径加工方法及设备
CN109290512B (zh) * 2018-08-08 2024-03-08 张家口北方对焊机有限公司 链条拉伸校正机
CN111570546A (zh) * 2020-06-02 2020-08-25 烟台孚信达双金属股份有限公司 铜铝复合排履带拉拔模具可移动装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4245434A1 (fr) 2022-03-17 2023-09-20 SMS group GmbH Procédé de traction à chenilles et machine de traction à chenilles
DE102022106273A1 (de) 2022-03-17 2023-09-21 Sms Group Gmbh Raupenzugziehverfahren und Raupenzugziehmaschine

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Publication number Publication date
EP0645200A1 (fr) 1995-03-29
ATE162742T1 (de) 1998-02-15
DE69408239T2 (de) 1998-08-27
ES2111225T3 (es) 1998-03-01
DE69408239D1 (de) 1998-03-05

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