DE3411578A1 - Method for detecting flaws in coatings and device for carrying out the method - Google Patents

Abstract

Method for detecting flaws in coatings such as, e.g., dust particles, so-called sags or wetting flaws on a surface of a coating, preferably a surface of a coating in the automotive industry. The surface of the coating is irradiated by a fluorescent tube in such a way that a mirror image of the fluorescent tube is produced by the surface of the coating. In addition to the mirror image of the fluorescent tube, the coating flaws luminescing due to the selected beam path are quantitatively detected using optoelectronic means. The optoelectronic means can be provided as a CCD array having upstream optics and arranged parallel to the fluorescent tube and at a prescribed angle to the surface of the coating which is determined by the mirror image of the fluorescent tube. <IMAGE>

Description

"method for determining Lsckfehlern and device for

Carrying out the method "The invention relates to a method according to the preamble of claim 1.

The automatic production of painted surfaces of any Objects in industry are well known, especially paint surfaces in the automotive industry.

The lacquer surfaces produced in this way can also disadvantageously Paint defects such as dust particles, so-called runs or wetting defects. It is therefore also necessary to check the painted surfaces at a later date, which is carried out, for example, in the form of the "experienced gaze of the master".

The invention is based on the object of providing a method or

to propose a device by which an automatic Testing of paint surfaces for paint defects, preferably in the automotive industry, is made possible.

According to the invention, the object is achieved by the characterizing process steps solved by claim 1.

Refinements of the method according to the invention are set out in the subclaims 2 and 3.

A device according to the invention for carrying out the method is claimed in claim 4.

The subclaims 5 to 7 describe further developments according to the invention the device.

The technically relatively inexpensive solution according to the invention advantageously enables the acquisition and display - possibly reduced Representation - of larger surfaces as well as the saving of a permanent one Operator performing observation, since permanent observation in the case the use of an alarm device is not necessary.

In the drawing is a device according to the invention for implementation of the process shown in side view.

The lacquer surface 1 is irradiated by a fluorescent tube 2, which are removed from the paint surface 1 at a predetermined, unspecified distance is arranged. A mirror image 2 ′ of the fluorescent tube 2 is generated.

Parallel to the fluorescent tube 2 is at a predetermined angle to the lacquer surface 1, which is determined by the mirror image 2 'of the fluorescent tube 2 is, a CCD array 3 (Charge-Coupled-Device) with upstream optics 4 is arranged. The lacquer surface irradiated by the fluorescent tube 2 is created by means of the optics 4 with any paint defects not shown in the drawing, as well as that Mirror image 2 'of the fluorescent tube 2' on the CCD array 3, the by other optoelectronic means can be substituted. By the chosen The paint defects that lead to deformations of the otherwise smooth paint surface light up in the beam path 1 lead, and are quantitative next to the mirror image 2 'of the fluorescent tube 2 recorded. For this purpose, the CCD array 3 can have a monitor 5 to make the paint defects visible or another evaluation device can be connected downstream, for example one Evaluation device enabling automatic testing of the paint surface.

To determine paint defects in an automated production process to be able to perform, it is provided that the paint surface 1 at locally fixed Fluorescent tube 2, optics 4 and CCD array 3 is transported past. It is too It is conceivable that the fluorescent tube 2, the optics 4 and the CCD array 3 at a locally fixed paint surface 1 are moved past in order to achieve the stated purpose.

Claims (7)

PATENT CLAIMS 1. method for determining paint defects such. B. dust particles, so-called runners or wetting defects on a paint surface, preferably a paint surface in the automotive industry, characterized in that that the lacquer surface (1) is irradiated by a fluorescent tube (2) that a A mirror image (2 ') of the fluorescent tube (2) is generated by the lacquer surface (1), and that in addition to the mirror image (2 ') of the fluorescent tube (2) by the selected Strahlensang luminous paint defects with optoelectronic means (3) quantitatively are recorded. 2. The method according to claim 1, characterized in that the paint surface (1) on a locally fixed fluorescent tube (2) and locally fixed is transported past optoelectronic means (3). 3. The method according to claim 1, characterized in that the fluorescent tubes (2) and the optoelectronic means (3) on a locally fixed paint surface (1) be brought by. 4. Apparatus for performing the method according to claim 1, 2 or 3, characterized in that the optoelectronic means is a CCD array (3) is provided, which is parallel to the fluorescent tube (2) and under a given, by the mirror image (2 ') of the fluorescent tube (2) determined angle to the paint surface (1) is arranged. 5. Apparatus according to claim 4, characterized by the CCD array (3) upstream optics (4). 6. Apparatus according to claim 4 or 5, characterized in that the the CCD array (3) is followed by a monitor (5) to make the paint defects visible is. 7. Apparatus according to claim 4, 5 or 6, characterized by a Evaluation device arranged downstream of the CCD array (3), which carries out an automatic test the paint surface (1) or the paint defects.