EP0603772B1 - Procédé pour la fabrication de parties extérieures de véhicules par estampage avec de tÔles prérevêtues - Google Patents

Procédé pour la fabrication de parties extérieures de véhicules par estampage avec de tÔles prérevêtues Download PDF

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Publication number
EP0603772B1
EP0603772B1 EP93120457A EP93120457A EP0603772B1 EP 0603772 B1 EP0603772 B1 EP 0603772B1 EP 93120457 A EP93120457 A EP 93120457A EP 93120457 A EP93120457 A EP 93120457A EP 0603772 B1 EP0603772 B1 EP 0603772B1
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EP
European Patent Office
Prior art keywords
stamping
painting
station
along
painted
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
EP93120457A
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German (de)
English (en)
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EP0603772A1 (fr
Inventor
Mario Da Re'
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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Filing date
Publication date
Application filed by Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0603772A1 publication Critical patent/EP0603772A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies

Definitions

  • the present invention relates to a method for the production of external components by stamping using pre-painted metal sheet according to the precharacterising part of claim 1.
  • the bath painting methods e.g. cataphoresis, anaphoresis and the like, used for the painting of mass-produced vehicle bodyworks have a number of drawbacks if applied to small or medium production runs, in which case they are not economic and are a possible cause of environmental pollution as a result of the low level of paint use.
  • typical of some custom-built motor vehicle models for instance convertibles, spiders, etc.
  • use has up to now been made of spray painting methods, followed by oven-drying of the body in order to evaporate the solvents and polymerize the paint.
  • This method also entails high costs, very bulky paint stations and possible environmental pollution due in particular to the solvents which are needed for spray painting; moreover, the degree of finish and the quality of the paint may be lacking as this method does not produce readily reproducible results.
  • the object of the invention is to provide a method for the production of external vehicle bodywork components by stamping which resolves the drawbacks described above by using pre-painted sheet and makes it possible to produce, at the end of a single production line, body components which are painted with a final coat and ready for assembly on the body.
  • a production line is shown overall by 1 and carries out, along the same single line 1, a method for obtaining, by stamping from a roll 2 of metal sheet, external vehicle bodywork components 3, for instance bonnets, mudguards and the like, which are already painted with a final coat and ready for assembly on the vehicle body.
  • external vehicle bodywork components for instance bonnets, mudguards and the like, which are already painted with a final coat and ready for assembly on the vehicle body.
  • the line 1 comprises in sequence a first known station 4 for the unwinding of the roll 2, a known station 5 disposed immediately downstream of the station 4 in which the roll 2 being unwound is cut (for instance by means of a mechanical cutting device) into sections i.e.
  • the line 1 further comprises at least one stamping station 16 for the sections 3 disposed immediately downstream of the station 12 and served, in the non-limiting example shown, by respective robotized handling devices 17, preferably of the known type provided with suction take-up members, which take up the sections 6 from the belt 7 and, respectively, the finished components 3 stamped by the station 16 in order to deposit them on a storage rack 18 or, in a variant which is not shown, directly on a conveyor for an assembly line for the components 3 of the bodywork of a vehicle, which is not shown for purposes of simplicity.
  • the stations 10, 11 and 12 carry out a painting operation on the sections 3 directly on the same cutting and stamping line of the sections or directly on the line 1.
  • the station 10 is a known washing and degreasing station for the sections 3 of the strip 2 of metal sheet and the station 11 is a known wiping and drying station.
  • the washed and dried sections 3 are then supplied to the station 12 which, according to the invention, is formed by an oven of the known paternoster type modified so that it operates as a powder painting booth.
  • the oven forming the station 12 comprises a housing 20 and a moving component 21 on which the sections 3 rest and which has a vertical development and comprises an ascending branch 22 and a descending branch 23; at the summit of the two branches 22, 23 there is disposed within the housing 20 a heating means 24; according to the invention, there is disposed along the ascending branch 22 a powder painting device 25, of known electrostatic type, by means of which a powder paint of any known type is deposited by spraying on the sections 6 entering the station 12 and ascending along the branch 22 towards the summit of the oven and the heating means 24.
  • the spray depositing is carried out by the device 25 using the technology known as "airless” by means of which only the powder paint, without any carrier fluid, is sprayed on the sections 6; the powder paint is caused to adhere to the sections 6 electrostatically, electrically charging with a predetermined polarity the section of the ascending branch 22 disposed at the device 25 (for instance by means of an appropriate sliding contact), in order electrically to charge the sections 6 transported thereby with the same polarity, and charging the spray paint emerging from the device 25 with an opposite polarity.
  • airless by means of which only the powder paint, without any carrier fluid, is sprayed on the sections 6; the powder paint is caused to adhere to the sections 6 electrostatically, electrically charging with a predetermined polarity the section of the ascending branch 22 disposed at the device 25 (for instance by means of an appropriate sliding contact), in order electrically to charge the sections 6 transported thereby with the same polarity, and charging the spray paint emerging from the device 25 with an opposite polarity.
  • the method of the invention for the production of the external bodywork components 3 by stamping is carried out as follows.
  • a roll 2 of metal sheet pre-painted with a base coat which is widely commercially available this is then treated in sequence along the same production line (in this case line 1) by cutting the roll 2 into sections 6, stamping each section 6 into the desired component and painting these sections with a final coat using a powder paint applied by means of an electrostatic painting operation, carried out within the oven of the known paternoster type forming the station 12.
  • the painting operation takes place, as shown in Fig. 1, upstream of the stamping operation; in particular, the sections 6 obtained as output from the station 5, after cleaning and drying (by means of the stations 10 and 11) are introduced into the paternoster oven 12 where the ascending branch 22 of the moving component 21 moves them towards the heating means 24 causing the sections 6 to pass through the painting device 25 where powder paint of the desired colour and quantity is deposited; the temperature increase generated by the means 24 causes the fusion and polymerization of the powder paint deposited on the sections 6 thereby providing a stable film of paint thereon; as they pass along the descending branch 23, the painted sections 6 move away from the means 24, gradually becoming cooler and leaving the station 12 at ambient temperature, where they are taken up by a handling device 17 for the stamping operation.
  • the stations 10, 11 and 12 are disposed in sequence along a production line 100 similar to the line 1 downstream of the stamping station (or plurality of stations) 16, rather than upstream as in the case of the line 1.
  • the production line 100 is otherwise identical to the line 1. Consequently, according to this variant of the method of the invention, the powder painting operation is carried out downstream of the stamping operation, rather than upstream as in the case of Fig. 1.
  • the strip 2 is cut into sections 6 in the station 5 and these sections are then taken up one by one by a first handling device 17 and supplied to the station (or plurality of stations) 16 and stamped into the shape of the components 3 to be obtained, as described above, providing as output from the station 16 semi-finished components or stamped sections 6a; these stamped sections 6a are taken up by a second handling device 17 and deposited on the belt 7 which conveys them through the stations 10, 11 and 12 where the sections 6a are subject to washing and degreasing, to wiping and drying and to powder painting in the desired colour, using the same methods as described above, and providing as output the finished components 3 (stamped and painted with a final coat) ready for assembly on the bodywork.
  • the powder painting takes place by bringing the sections 6 or 6a, as they ascend along the branch 22 of the paternoster station 12, to a temperature of approximately 50°C (as a result of the gradual heating due to their movement towards the heating means 24), then carrying out deposition, using an "airless” technology, of the powder paint on the sections 6, 6a and finally heating the sections 6, 6a again to approximately 120°C at the summit of the oven 12 and the respective branches 22, 23, at which temperature the paint fuses and polymerizes providing the desired film of final paint.
  • the sections 6 or 6a are subsequently cooled to ambient temperature by heat dissipation as they descend along the branch 23.
  • pre-painted metal sheets in order to provide the powder paint with an anchoring substrate.
  • stamping following painting is applied in the case of components 3 of simple shape which may be obtained by stamping which is not very deep; in this case, the fact that the stamping station is disposed along the same line as the painting station and immediately downstream of the latter, makes it possible to carry out the stamping operations while the layer of paint is still at the polymerization stage (in particular reticulation) and therefore has sufficient fluidity to follow the deformation of the sheet without peeling or becoming detached, although remaining sufficiently polymerized to be stably anchored to the section of sheet.
  • the method of Fig. 2 is preferably used when it is necessary to carry out deep stamping operations (of the deep-drawing type) on the sections 6; in this case, however, the fact that the final coat painting operation is carried out using powder technology and immediately downstream of stamping, when the stamped sections 6a still have a certain residual tension and without the layer pre-painted with a base coat, even if possibly damaged, having had time to deteriorate, as could be the case when stored and painted subsequently on a different line, makes it possible to obtain a surface appearance of the final coat which is surprisingly good and free from defects.
  • vehicle production lines using components produced by the method of the invention are of extremely small size because of the omission of the booths and ovens conventionally used for the painting of the entire body which are replaced by the paternoster station 16 which is vertical and combines the oven and painting booth functions and which, as it has to treat the separate components (all of very reduced size when taken individually with respect to an overall bodywork) has very small dimensions with respect to conventional ovens and painting booths.
  • the use of powder paint technology also makes it possible to eliminate any pollution (solvents are not used) and substantially to reduce power consumption.
  • the method of the invention is very advantageous for the small or medium production runs typical of custom-built vehicles, since a single line, with the simple re-equipment of the stamping stations, may produce all the components needed to assembly the bodywork of many different types of vehicle, avoiding any need to store the finished components and thereby making it possible to use "just-in-time" techniques providing substantial reductions in vehicle production costs.
  • the painted components must be handled as delicately as possible along the line 1; use may be made, for this purpose, of robotized handling devices provided with suction take-up devices or, in a variant which is not shown, manual handling by specialist operators.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (8)

  1. Procédé pour la production par estampage de composants extérieurs (3) en utilisant une tôle pré-peinte, dans lequel un rouleau (2) de tôle pré-peinte avec une peinture primaire est traité en séquence le long d'une chaíne de production (1) par les étapes suivantes :
    (i) dérouler la tôle pré-peinte du rouleau (2) ;
    (ii) couper la tôle pré-peinte déroulée en sections sous-dimensionnées (6) ;
    (iii) estamper chacune desdites sections sous-dimensionnées (6) en le composant désiré (3) ;
    (iv) peindre chacune desdites sections sous-dimensionnées (6) avec un revêtement final en utilisant une peinture en poudre appliquée au moyen d'une opération de peinture électrostatique effectuée dans un poste de peinture ;
    caractérisé en ce que
    (a) lesdits composants sont des composants extérieurs de carrosserie de véhicule (3) ;
    (b) ledit poste de peinture est une étuve (12) du type pater-noster, comprenant un carter (20), un composant mobile (21) et un moyen de chauffage (24), dans lequel le composant mobile (21) comprend une branche ascendante (22) et une branche descendante (23) et le moyen de chauffage est disposé dans le carter (20) au sommet des deux branches (22, 23) ;
    (c) ladite opération de peinture électrostatique est effectuée en pulvérisant la peinture en poudre en correspondance avec la branche ascendante (22) et contre les sections sous-dimensionnées (6) montant le long de ladite dernière branche (22) en direction du sommet de l'étuve (12) et du moyen de chauffage (24).
  2. Procédé selon la revendication 1, dans lequel ladite étape de peinture (iv) est effectuée avant ladite étape d'estampage (iii) et le long de la même chaíne de travail (1), en plaçant ladite étuve (12) le long de ladite chaíne de travail (1) en amont d'un poste d'estampage (16).
  3. Procédé selon la revendication 1, dans lequel ladite étape de peinture (iv) est effectuée après ladite étape d'estampage (iii) le long de la même chaíne de travail (1), en plaçant ladite étuve (12) le long de ladite chaíne de travail (1) en aval d'un poste d'estampage (16).
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel, avant ladite étape de peinture en poudre, chacune desdites sections sous-dimensionnées (6) est soumise à des étapes de lavage et de séchage effectuées dans des postes respectifs (10, 11) de ladite chaíne de travail (1).
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel :
    (d) ladite peinture en poudre est appliquée sur lesdites sections sous-dimensionnées (6) au moyen d'une technologie de pulvérisation "sans air" au moyen d'un dispositif de peinture en poudre (25) placé dans ladite étuve (12) le long de ladite branche ascendante (22) dudit composant mobile (21) ; et dans lequel
    (e) chacune desdites sections sous-dimensionnées peintes (6) est progressivement amenée à la température de fusion et de polymérisation de la peinture en poudre le long de ladite branche ascendante (22), en se rapprochant progressivement dudit moyen de chauffage (24) au niveau du haut de l'étuve (12) et est ensuite refroidie pendant qu'elle se déplace vers le bas le long de ladite branche descendante (23) de l'étuve (12).
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel toutes ces étapes sont effectuées en des postes respectifs (4, 5, 10, 11, 12, 16) disposés en séquence le long d'une chaíne de production unique (1), au début de laquelle est disposé ledit rouleau (2) de tôle pré-peinte, et à la fin de laquelle les composants de carrosserie estampés et peints en finition (3), prêts à être montés sur une carrosserie de véhicule, sont prélevés.
  7. Procédé selon la revendication 6, dans lequel le mouvement entre un poste et un autre (4, 5, 10, 11, 12, 16) est obtenu par une manutention manuelle desdites sections sous-dimensionnées (6).
  8. Procédé selon la revendication 6, dans lequel le mouvement entre un poste et un autre (4, 5, 10, 11, 12, 16) est obtenu par une manutention automatique desdites sections sous-dimensionnées (6) effectuée par des dispositifs de manutention robotisés (17) ayant des dispositifs de préhension à ventouses.
EP93120457A 1992-12-22 1993-12-17 Procédé pour la fabrication de parties extérieures de véhicules par estampage avec de tÔles prérevêtues Expired - Lifetime EP0603772B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO921030 1992-12-22
ITTO921030A IT1257949B (it) 1992-12-22 1992-12-22 Procedimento per la produzione per stampaggio di componenti esterni della carrozzeria di veicoli utilizzando lamiere metalliche pre-verniciate.

Publications (2)

Publication Number Publication Date
EP0603772A1 EP0603772A1 (fr) 1994-06-29
EP0603772B1 true EP0603772B1 (fr) 1998-04-01

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ID=11410936

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Application Number Title Priority Date Filing Date
EP93120457A Expired - Lifetime EP0603772B1 (fr) 1992-12-22 1993-12-17 Procédé pour la fabrication de parties extérieures de véhicules par estampage avec de tÔles prérevêtues

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Country Link
EP (1) EP0603772B1 (fr)
DE (1) DE69317745T2 (fr)
IT (1) IT1257949B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4405170A1 (de) * 1994-02-18 1995-08-24 Basf Lacke & Farben Verfahren zur Herstellung von Deckeln und/oder Böden für Verpackungsbehälter, die so hergestellten Deckel und Böden sowie ihre Verwendung zur Herstellung von Verpackungsbehältern, insbesondere für Lebensmittelverpackungen
DE19612898C1 (de) * 1996-03-30 1997-04-03 Herberts Gmbh Verfahren zur Herstellung von Automobilkarosserieteilen und Automobilkarosserien
CN103143623B (zh) * 2013-02-20 2016-03-30 安徽江淮汽车股份有限公司 伺服冲压自动化生产工艺及其装置

Also Published As

Publication number Publication date
ITTO921030A0 (it) 1992-12-22
DE69317745D1 (de) 1998-05-07
EP0603772A1 (fr) 1994-06-29
ITTO921030A1 (it) 1994-06-22
DE69317745T2 (de) 1998-07-30
IT1257949B (it) 1996-02-19

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