Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/002—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the work consisting of separate articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/005—Curtain coaters
• • 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
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
  • B05D1/305—Curtain coating
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S118/00—Coating apparatus
  • Y10S118/04—Curtain coater

Definitions

• the invention relates to a method for the serial painting of metal visible body outer parts of motor vehicles prior to assembly on the motor vehicle, an object surface to be painted being curved in one direction of expansion.
• a visible body part is the bezel attached to the B-pillar, which is found in several vehicle types and is made of metal and requires a high-quality paint job.
• the panel is regularly at least slightly curved in the longitudinal direction of expansion in accordance with the later body shape.
• the present invention is therefore based on the object of proposing a method of the type mentioned at the outset which enables the objects to be painted more cost-effectively without sacrificing quality.
• the objects to be painted are fixed on holding means of a transport device and then, while remaining permanently on the respective holding means, by a falling paint curtain consisting of liquid paint whose curtain level is moved through in such a way that the curved surface of the object points upwards and the direction of expansion of the curvature, seen in plan view, coincides with the direction of transport, with the positioning of the holding means as it passes through the lacquer curtain expediently being controlled painting objects affected.
• Paint pouring devices as such are known.
• One type known to the applicant has a pouring head for producing a lacquer curtain consisting of liquid lacquer flowing downward, a collecting device for unused lacquer of the lacquer curtain arranged at a distance below the pouring head, and one outside of the fal ⁇ transport device for transporting the objects to be painted on a transport path crossing the paint curtain transversely to the plane of the curtain.
• a further object of the invention is therefore to provide a paint pouring device of the aforementioned type which enables time-saving, cost-effective and high-quality painting even with curved article surfaces and with articles of smaller dimensions.
• holding means are provided on the transport device, which allow detachable individual fixing of the objects to be painted, and on which the objects to be painted remain when passing through the paint curtain, and that the holding means from the side are directed towards the transport path crossing the curtain level, so that they pass through the lacquer curtain in the region of at least one side edge when passing through.
• Fig. 1 shows a preferred design of the invention
• FIG. 2 shows a cross section through the lacquer casting device according to FIG. 1 in the sectional plane indicated by section line II-II and upstream of the casting zone,
• FIG. 3 shows an embodiment variant of the holding means used to fix the objects to be painted
• Fig. 4 is a schematic representation of a preferred mode of operation of the paint pouring device.
• the paint pouring device shown in FIGS. 1 and 2 has a first paint pouring station 10 with a pouring head 1 of known type, which has an elongated shape and has a longitudinal slot 2 indicated by dashed lines on the underside.
• Liquid coating which comes from a storage container 4 can be supplied to the casting head 1 by means of a pump 3.
• the term “paint” is understood to mean any paint or coating material.
• liquid paint emerges from the casting head 1 via the longitudinal slot 2 and forms a kind of coherent film, which in the present case is referred to as a paint curtain 5.
• This continuously falling paint curtain 5 falls into a bowl-like collecting device 6, which is arranged at a distance below the casting head 1 and is vertically opposite the longitudinal slot 2.
• a return line 7 connected to the collecting device 6 leads the collected paint into the storage container 4 back from where it is fed to the casting head 1 again.
• a preparation device can be interposed in the line connection between the collecting device 6 and the pouring head 1, which ensures constant paint quality.
• the area occupied by the falling paint curtain 5 during operation is referred to as the casting zone 8.
• a transport device 12 is provided, which serves to move objects 13 of any type to be painted transversely and in particular at right angles to the curtain plane 14 (FIG. 4) containing the paint curtain 5 (FIG. 4) through the paint curtain 5.
• the transport path 15 traversed by the objects 13 is indicated by dash-dotted lines in FIGS. 1 and 4. It preferably crosses the curtain plane 14 at a right angle.
• the transport device 12 is located on the side next to the casting zone 8, next to which it extends past. It is adjacent to one of the side edges 16 of the falling paint curtain 5 (see also FIG. 2).
• the transport device 12 preferably comprises a transport strand 17 that is only schematically and only partially shown. It can be of endless design and be self-contained. By means of a drive motor (not shown in more detail), it can be driven for a transport movement in a direction of movement indicated by arrow 18. In the exemplary embodiment, the transport movement is a circular movement.
• the transport line 17 according to the example is a link line 23 which is formed by a chain which is guided, for example, by at least two spaced wheels, not shown.
• a plurality of holding means 25 spaced apart from one another are arranged on the transport strand 17 in the direction of movement 18. They extend transversely to the direction of movement 18 and also transversely to the transport path 15 crossing the lacquer curtain 5. As can be clearly seen from FIG. 2, they project in the transverse direction from the transport strand 17 in the manner of a cantilever. They are thus directed from the side towards the transport path 15, in the area of which they are each equipped with at least one fastening means 26, which enables the detachable fastening of one of the objects 13 to be painted.
• These fasteners 26 are designed as required, in the present case they are permanent magnetic magnetic parts which enable the objects 13, which are made of ferromagnetic metal, for example, to be optimally fixed. Detachable adhesives, hook parts, clamping elements or suction means could be mentioned as examples of further configurations. The latter is particularly the case for objects made of aluminum or other non-ferromagnetic material.
• the objects 13 to be painted remain permanently fixed on the associated holding means 25 on the transport path 15 during the penetration of the paint curtain 5. They are attached to a holding means 25 before they pass through the lacquer curtain 5 and are then transported by the latter in the direction of the lacquer curtain 5 and through it.
• a holding means 25 In Fig. 1, one of the objects 13 'is in front of the paint curtain 5, another (13' ') has already passed through the paint curtain 5, and another (13' '') has just about half penetrated the paint curtain 5 .
• the other holding means 25 present are not shown in FIG. 1.
• the uninterrupted and transferless fixation of the objects 13 when passing through the paint curtain 5 has the advantage that the objects 13 can be aligned without problems in a way that ensures an optimal painting of the object surface 27 to be painted. This advantage is particularly noticeable with such objects.
• the one whose object surface 27 to be painted is not flat, as in the exemplary embodiment, but is curved in at least one direction of expansion - indicated by double arrow 28.
• a respective object 13 should be aligned such that the section of the curved object surface 27 pointing in the direction of advance is higher than the following surface sections, which sink counter to the transport direction.
• the optimum position in each case is determined empirically, and then the holding means 25 and / or the fastening means 26 are arranged or positioned such that the objects 13 assume the desired basic object position. It is advantageous if the holding means 25 and / or the fastening means 26 are adjustable with respect to the transport strand 17.
• the transport device 12 Since the transport device 12 is located outside the casting zone 8, it is not contaminated or at least not significantly contaminated by the paint flowing downward. This ensures trouble-free long-term operation. Only the holding means 25 briefly enter the casting zone 8 when they pass through the lacquer curtain 5. They pass through the lacquer curtain 5 in the area of the side edge 16 mentioned. However, since the holding means 25 can be designed to be relatively narrow, they hold the loss of paint and the pollution within small limits. In addition, cleaning can be carried out without any problems because of the small surfaces. For this reason, the holding means 25 present according to the example are designed as holding arms having a rod structure.
• holding means 25 are arranged only on one side of the casting zone 8. If required, however, corresponding holding means 25 can also be provided on the opposite side (indicated in FIG. 2 at 25 '), which are then expediently arranged on a further transport line. These opposed orderly holding means then pass through the assigned other side edge 16 of the lacquer curtain 5 in a corresponding manner during the object transport. It is thus possible to make better use of the width of the paint curtain 5 by simultaneously moving two parallel rows of objects through the paint curtain 5, an independent drive being possible. Furthermore, there is also the possibility of constantly holding a respective object from two sides at the same time, provided that it appears necessary in order to ensure that objects 13 are fixed in a stable manner.
• the objects 13 which are subjected to the painting process in the exemplary embodiment are sheet metal parts of smaller dimensions which are used as visible exterior parts of the body in automobiles. In the special case, these are metal screens which are installed on the B-pillar between the front and rear side windows of the automobiles.
• the object surface 27 which forms the visible surface is slightly curved in the longitudinal direction and can run, in particular, in a straight line transversely thereto or likewise have a slight curvature.
• the objects 13 are preferably attached to the holding means 25 in such a way that the object surface 27 to be painted faces upwards, ie one facing upwards Has directional component, wherein the alignment is also made so that the direction of expansion 28 of the curvature - seen vertically from above in plan view - coincides with the transport direction of the objects 13 along the transport path 15.
• flat object surfaces can also be painted.
• the objects 13 to be painted in the embodiment have, in addition to the already mentioned first object surface 27, a second object surface 27 'to be painted, which runs at an angle to the former.
• the present objects 13 are thin metal parts which are bent along a longitudinal edge, so that two first and second object surfaces 27, 27 ', which run essentially at right angles to one another, result.
• the exemplary coating device is now equipped with first control means 32, with which the holding means 25 can be shifted between two holding positions 33, 33 'shown in FIG. 2, in which the objects 13 arranged thereon are two different objects - Assume basic positions 34, 34 ', in each of which one of the object surfaces 27, 27' assumes the optimal and previously described orientation for the application of casting lacquer.
• the exemplary coating device has a second coating station 10 ', the structure of which corresponds to that of the first (10), which is why it is only indicated by dash-dotted lines in FIG. It is arranged at a distance from the first paint casting station 10 in the transport direction of the objects 13. It is provided according to the example that a respective object 13 passes through the lacquer curtains 5 of both lacquer casting stations 10, 10 * one after the other, namely the first lacquer casting station 10 in one object basic position 34 and the following second lacquer casting station 10 'in the other object basic position 34 '.
• FIG. 2 shows the first basic object position 34 in the first paint pouring station 10, the dot-dash line in the second paint pouring station 10 'assumed second basic object position 34' and the associated second holding position 33 'is entered to illustrate the different orientations.
• Holding means 25 are arranged rigidly on the transport line 17, the first control means 32 act on the transport line 17.
• the action zones are preferably located in the area adjacent to the casting zone 8 of a respective coating station 10, 10 '.
• the first control means 32 can, as indicated, be formed by rail-like guide means, in which the transport strand 17 runs, and which have different orientations at the two lacquer casting stations 10, 10 ', so that the transport strand 17 and thus also the holding means 25 attached to it Be forced to go through the different positions.
• the guide means which are profiled approximately U-like in cross section, are pivoted or rotated by 90 ° about the direction of movement 18 for specifying the two holding positions 33, 33 '.
• each holding means 25 has a first section 46 adjoining the transport strand 17 and an end section 47 standing at an angle thereto, on which the fastening means 26 is located.
• the holding means 25 with the first section 46 protrudes transversely to the transport path 15 and in particular horizontally into the paint curtain 5 when the paint curtain 5 passes through, and the end section 47 projects upward.
• the first section 46 projects in particular vertically downwards and only the end section 47 dips into the lacquer curtain 5 via the intermediate space 42.
• FIG. 3 shows a variant in which the first control means, not shown here, have a movable section 36 act on the arm-like holding means 25 without influencing the position of the transport strand 17.
• the movable section 36 is expediently a swivel section which can be swiveled up and down between the two possible positions by the first control means 32 according to the double arrow 37.
• the first control means can be formed here, for example, by a control curve or line along which the movable sections 36 of the holding means 25 run. It would also be possible for the entire holding means to be movably suspended on the transport line 17 instead of a movable section.
• the exemplary lacquer casting device on both sides of the casting zone 8 has an edge delimiter 38, 39 which defines the associated side edge 16, 16 'of the lacquer curtain 5. It protrudes vertically starting from the casting head 1 downward, but at least the edge delimiter 38 associated with the mentioned side edge 16 ends at a distance above the collecting device 6. In this way, a passage gap 42 remains for the holding means 25 holding the objects 13.
• Edge delimiter 38 when passing through the paint curtain 5 by passing through the passage space 42.
• the objects 13 are attached to the respective holding means 25 in such a way that the object surface 27, 27 'to be painted is held in the area of the paint curtain 5 flanked on both sides by the edge delimiters 38, 39.
• the paint application thus takes place in the area of optimal formation of the paint curtain 5.
• second control means 43 which enable the position of the holding means 25 to be changed while the respectively assigned object 13 passes through the paint curtain 5.
• the second control means 43 can, for example, have suitable servomotors, for the control of which there are sensors 44 which detect the current position of the object 13 in the painting process.
• an incoming object 13 drawn in solid lines is initially oriented such that the front surface area of the curved object surface 27 to be painted, which is pointing in the direction of advance, is perpendicular to the curtain plane 14. running.
• the front surface area is lowered by pivoting the holding means 25 (dash-dotted line), so that the subsequent surface areas of the object surface 27, which are each under the influence of the paint curtain 5, are always approximately at right angles to the curtain level 14.

Landscapes

• Application Of Or Painting With Fluid Materials (AREA)
• Coating Apparatus (AREA)
• Spray Control Apparatus (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)
• Liquid Crystal (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=6510367

Family Applications (1)

Country Status (14)

Cited By (1)

Families Citing this family (16)

Family Cites Families (8)

• 1994
  • 1994-02-17 DE DE4404877A patent/DE4404877C1/de not_active Expired - Fee Related
• 1995
  • 1995-02-01 US US08/693,129 patent/US5773094A/en not_active Expired - Fee Related
  • 1995-02-01 HU HU9602140A patent/HU219064B/hu not_active IP Right Cessation
  • 1995-02-01 AT AT95907006T patent/ATE173658T1/de not_active IP Right Cessation
  • 1995-02-01 PL PL95315957A patent/PL176914B1/pl not_active IP Right Cessation
  • 1995-02-01 ES ES95907006T patent/ES2123955T3/es not_active Expired - Lifetime
  • 1995-02-01 CA CA002183356A patent/CA2183356A1/fr not_active Abandoned
  • 1995-02-01 WO PCT/EP1995/000351 patent/WO1995022410A1/fr active IP Right Grant
  • 1995-02-01 EP EP95907006A patent/EP0745001B1/fr not_active Expired - Lifetime
  • 1995-02-01 CN CN95191682A patent/CN1065455C/zh not_active Expired - Fee Related
  • 1995-02-01 JP JP52153595A patent/JP3498961B2/ja not_active Expired - Fee Related
  • 1995-02-01 AU AU15376/95A patent/AU1537695A/en not_active Abandoned
  • 1995-02-01 DK DK95907006T patent/DK0745001T3/da active
  • 1995-02-01 MX MX9603428A patent/MX9603428A/es unknown
  • 1995-02-01 DE DE59504335T patent/DE59504335D1/de not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events