Coating processes – Restoring or repairing – Metal article
Reexamination Certificate
1998-06-01
2001-02-13
Beck, Shrive (Department: 1762)
Coating processes
Restoring or repairing
Metal article
C427S010000, C427S140000
Reexamination Certificate
active
06187375
ABSTRACT:
The invention relates to a process for repair of coating defects of only a small extent on a surface coating of a flat part by means of a number of repair tools which are used in succession, the surface encompassed by the repair efforts remaining essentially restricted to the extension area of the coating defect.
The process described previously for repair of coating defects is described for example in German patent disclosure document DE 38 33 225 C2 (B 05 D 3/06). Here especially a process is discussed for repair of the enamel coating in motor vehicle chassis, in which the enamel defects are caused for example by particles of dust or drops of oil. The range of applications extends of course also to enamel coatings in a wide range of general articles, for example, housings in electrical devices.
In the approach described in DE 38 33 225 C2 the following repair tools are used:
Spot elimination of coating defects takes place by means of laser beam, the repair mixture is applied with the aid of a carrier foil and via the action of the laser beam or alternatively in liquid form via a metering device, subsequent setting takes place at room temperature or even supported by hot air, hot gas or other heat effects (for example, infrared radiation, electron beams, induction heating, UV heating), while finally a suitable grinding device can be used for final smoothing.
Patent DE 38 33 225 C2 says nothing specific about handling of the repair tools which had been described previously and which must be positioned individually relative to a repair site of very small extent. In addition, the use of a laser beam device for this purpose entails an almost unreasonable equipment complexity which is also associated with accordingly high cost.
Alternatively, in Japanese patent application 1-315374 (B 05 D 7/14) for removal of a coating defect (for example, a particle of dust) a mechanical cutting machine dimensioned accordingly is proposed which likewise is designed to penetrate only the desired small depth into the surface coating. However this cannot be done with the means shown. The scale of the representation in
FIG. 1
b
of this patent application is completely distorted. Thus, in the representation the diameter of the cutting machine corresponds approximately to the sum of the enamel layer thicknesses which in practice is roughly in the range of 50 &mgr;m. To be able to remove a coating defect (for example, a particle of dust) the cutting machine would conversely have to have a multiple (for example 2 mm diameter) of the size shown. Due to the conical shape of the tip of the cutting machine this would mean that the tip would already have penetrated all coatings before the edge area of the tip of the cutting machine had reached the uppermost layer. Proper repair of a coating defect cannot be done in this way. After filling with coating mass, distorted light refraction would result since optical disturbances occur in and on the individual enamel layers.
The object of the invention is to optimize the process for repair of coating defects given in the preamble of patent claim
1
such that good handling of the individual repair tools is ensured and that the repair can be done quickly using them with the same repair quality.
This process has the further features according to the characterizing part of claim
1
as claimed in the invention. In claim
4
one especially well-suited device for executing the process is indicated.
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Alders Klaus
Dill Bernhard
Draeger Jorg
Audi AG
Beck Shrive
Kolb Jennifer L.
Lalos & Keegan
Lau Michael N.
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