EP1000671A2 - Procédé pour éviter la formation de gouttes de peinture sur des objets - Google Patents

Procédé pour éviter la formation de gouttes de peinture sur des objets Download PDF

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Publication number
EP1000671A2
EP1000671A2 EP99121210A EP99121210A EP1000671A2 EP 1000671 A2 EP1000671 A2 EP 1000671A2 EP 99121210 A EP99121210 A EP 99121210A EP 99121210 A EP99121210 A EP 99121210A EP 1000671 A2 EP1000671 A2 EP 1000671A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
paint
formation
collection
drops
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.)
Granted
Application number
EP99121210A
Other languages
German (de)
English (en)
Other versions
EP1000671B1 (fr
EP1000671A3 (fr
Inventor
Rudolf Dipl.-Ing. Linek
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1000671A2 publication Critical patent/EP1000671A2/fr
Publication of EP1000671A3 publication Critical patent/EP1000671A3/fr
Application granted granted Critical
Publication of EP1000671B1 publication Critical patent/EP1000671B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures

Definitions

  • the present invention relates to a method for avoiding drops of paint on the Usable surface of workpieces to be painted as well as appropriately adapted Workpieces.
  • Varnishes and coating agents are used to protect and optically design Surfaces applied to workpieces.
  • the processing of the paints and Coating agent takes place in the liquid or flowable state, since then on best a large, even distribution and a smooth surface of the Coating can be obtained.
  • the paints harden on the workpiece. This is usually done through chemical Crosslinking of the binders contained in the lacquer to form a polymer.
  • paints in the following general painting and Include coating agents
  • workpieces are different processes applied, especially dipping, flooding, brushing, rolling, rolling and spraying as well as special spraying processes for powder coatings.
  • paints which is kept liquid by solvents and / or water, manually using spray guns or automatically sprayed onto the workpiece. The runs on the workpiece fresh paint then to a more or less uniform and smooth coating.
  • the present invention has the object, the disadvantages of Avoid prior art and a method for avoiding drops of paint on electrically conductive workpieces and corresponding modifications of the To develop workpieces in which the formation of drops on the surface, especially around corners and edges.
  • This task is solved by a painting process, in which on the workpiece at least one paint collection formation is arranged outside the usable surface, on which possible drops of paint concentrate during painting.
  • the method according to the invention therefore takes on the workpiece to be painted constructive change.
  • This can be temporary, i.e. only for the duration of the Painting exist.
  • it is preferably permanent on the workpiece educated. Because the required change in the production of the workpiece is in generally simple and less time and effort than corresponding temporary manipulations before and after painting.
  • That the paint collection formation should be arranged "outside the usable surface” means that the drop forming must not disturb the usable surface, because one Such interference should be avoided.
  • the Paint collection formation are connected to the usable surface to be painted, so that flowing paint from the usable surface reaches the paint collection molding can. The paint then becomes one on the paint collection molding itself Drop formation directed at which a drop of paint can form without it would be annoying. The varnish collection thus guides the excess varnish from the critical points to uncritical ones, where the drop formation does not represent any damage.
  • the paint collection formation can have very different shapes as long as it is Function fulfills that focus on their paint drops that normally (without Paint collection molding) would form on the usable surface.
  • it can be both a depression and an elevation on the workpiece.
  • the lacquer collection formation is designed so that it adheres to it Paint drops due to gravity and / or due to electrical effects focus. Because the flow due to gravity or due to electrostatic repulsion of the electrically charged paint Main causes of drop formation.
  • the paint collection formation can bottom out during painting of the workpiece.
  • the paint collects on it due to the Flow according to gravity.
  • the "low point” can be both local (lowest point of the workpiece in a certain environment around the point) as also globally (no other point of the workpiece is lower) the lowest point of the Workpiece.
  • ground is the electrical potential of the environment of the painting process and is usually carried out with the voltage value zero (volts) equated.
  • the workpiece to be painted is often referred to when painting this ground potential is kept at a predetermined potential. That potential does not have to remain constant during painting, but can be a given one Follow the course. It can be larger (positive) or smaller (negative) than the ground potential his. The exact values depend on the conditions in practice, i.e. in particular the type of paint, the sign of the charge, the type and Geometry of the workpiece and the course of drying.
  • the potential at which the workpiece to be painted is held is preferably becomes equal to the ground potential, i.e. the workpiece is "grounded" or to zero volts placed. With this grounding, all charges can be found in the applied paint have accumulated, drain off. The remaining paint is then electrically neutral.
  • the method according to the invention is basically the case with all customary painting methods applicable where paint is in liquid or flowable form on the workpiece is applied, runs there and then dried. Preferably it will used together with a spray application of the paint, because this is precisely where the Drop formation intensifies.
  • the method according to the invention is most effectively carried out so that the workpiece automatically when inserted into the holder in which it is during painting is in a predetermined orientation in which the paint collection formation can take effect. Then there are no additional steps to align of the workpiece is necessary. If necessary, when inserting into the holder an electrical contact is automatically established.
  • the correct orientation of the Workpiece and possibly also the successful establishment of the contact can are easily monitored, e.g. since the contacting of the workpiece is capacitive noticeable. Unless correct alignment or insufficient contact exist, a warning signal can make workers aware of this, so that a review and correction can take place.
  • the invention further relates to workpieces with a useful surface to be painted.
  • a varnish formation arranged on which possible during the painting Lacquer drops can concentrate, which without the lacquer collection formation on the would focus usable surface.
  • That the paint collection formation means "outside the usable surface” means that it is arranged so that paint from the usable surface for Paint collection molding can flow, but this paint on the Lacquer collection formation is concentrated at a drop formation point at which can form a drop of paint without disruptive effects.
  • the drop formation point is located therefore outside the area of the usable surface.
  • a possible formation of the paint collection formation is that this one There is a head start on the workpiece.
  • Such a head start is a local survey that due to their extreme location, the accumulation of excess paint favors. This can be due to the effects of gravity as well as to one special electrostatic effect.
  • the paint collection formation may have a tip of increased curvature, i.e. the Curvature should be greater than the mean curvature of the workpiece, preferably the same size or larger than the curvature of the corners and edges of this Workpiece. Because under the influence of electrical charge electrostatic Fields at points of curvature their maximum strength. The electrically charged paint will therefore prefer to collect at such points of high field strength. For this reason the lacquer collection shape can also be referred to as an "integrated electrode".
  • the paint collection shape can be pin-shaped or nose-shaped.
  • shapes are easy to implement, especially by welding, Punching or embossing.
  • they have the necessary elevated location and a suitable curvature.
  • the paint collection formation is preferably on the inside (not to be painted) and / or the edge of the workpiece, particularly preferably in the immediate vicinity Neighborhood of the painted surface. In this position, the developing Drops do not disturb on the one hand, on the other hand the paint can easily be removed from the Usable surface for paint collection molding.
  • the paint collection formation can be arranged so that it during of painting forms the low point of the workpiece. In this case it accumulates the paint due to the flow according to gravity. Under the "Low point” becomes both a local (lowest point of the workpiece in one) certain environment around the point) as well as a global (no other point of the Workpiece is lower) height minimum understood.
  • the workpiece can in particular be a body element Act motor vehicle, preferably a body wall.
  • elements form droplets, which prevent further installation of elements.
  • Figure 1 illustrates the problem that is solved with the present invention.
  • the figure shows a drop 2a (arrow), which is at the lower end of the front Has formed fender 1a of a motor vehicle and the installation of the bumper (not shown) prevented.
  • This drop must therefore be removed by hand, taking it this inevitably leads to damage to the paint.
  • FIG. 2 shows how at the lowest point on the fender 1b according to the invention nose-shaped projection 3 is arranged.
  • Figure 3 shows the assembly of the fender 1a and 1b with a Bumper 4. This assembly is only in the prior art of Figure 1 possible if the drop 2a is pushed off manually beforehand. However, there is one great danger of destroying the entire coating at this point. At a Fender 1b modified according to the invention, however, is not in the way of the drop 2b and assembly can therefore be done easily.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Road Signs Or Road Markings (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP99121210A 1998-11-09 1999-10-23 Procédé pour éviter la formation de gouttes de peinture sur des objets Expired - Lifetime EP1000671B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19851467 1998-11-09
DE19851467A DE19851467A1 (de) 1998-11-09 1998-11-09 Verfahren zur Vermeidung von Lacktropfen an Werkstücken

Publications (3)

Publication Number Publication Date
EP1000671A2 true EP1000671A2 (fr) 2000-05-17
EP1000671A3 EP1000671A3 (fr) 2003-02-12
EP1000671B1 EP1000671B1 (fr) 2004-08-18

Family

ID=7887082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99121210A Expired - Lifetime EP1000671B1 (fr) 1998-11-09 1999-10-23 Procédé pour éviter la formation de gouttes de peinture sur des objets

Country Status (3)

Country Link
EP (1) EP1000671B1 (fr)
AT (1) ATE273758T1 (fr)
DE (2) DE19851467A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE447286C (de) * 1925-12-09 1927-07-18 Albert Krautzberger Verfahren und Vorrichtung zum Lackieren
US2359476A (en) * 1940-01-15 1944-10-03 Harper J Ransburg Company Electrostatic method and apparatus
US2950990A (en) * 1957-04-08 1960-08-30 Ibm Method for applying a uniform coating to a cylindrical body
US3341353A (en) * 1959-08-21 1967-09-12 Owens Illinois Inc Detearing method
DE2043268A1 (de) * 1970-09-01 1972-03-02 Itw Ateco Gmbh Verfahren zum Abdichten von Lackauslauflochern und Lochstopfen zur Ausübung des Verfahrens

Also Published As

Publication number Publication date
EP1000671B1 (fr) 2004-08-18
ATE273758T1 (de) 2004-09-15
EP1000671A3 (fr) 2003-02-12
DE19851467A1 (de) 2000-05-11
DE59910264D1 (de) 2004-09-23

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