The part being inspected vary in curvature, size, shape and material, with different specular characteristics.The inspection process must fit within the existing production cycle time.The vibrations induced from this motion makes profiling the surface harder. Parts are in motion while they are inspected on the production line.
#FISHEYE PAINT DEFECT SERIES#
There are a series of challenges that impact the development of an inspection system for this task, including: This extended version includes expended testing and analysis. This paper presents a system for inspecting automotive painted semi-specular exterior body parts and is an extension of work originally presented in 15th Conference on Computer and Robot Vision (CRV 2018). As a result, overall productivity and quality are diminished. Further, the defect judgement is very subjective, which results in inconsistencies. It is a costly and a labour intensive job which requires multiple inspection lines for high volume yield. This inspection process is usually carried out by human inspectors.
#FISHEYE PAINT DEFECT FULL#
As such, it is essential to perform a full inspection of every part. Defects may induce during any of these processes, which results in part rejection or rework, causing loss of revenue. This process consists of three main steps: moulding, cleaning, and painting. These outer body parts are made by Thermoplastic PolyOlefin (TPO) injection moulding process. Example of these parts includes front and back bumper covers, side fenders, and other exterior parts which are normally manufactured and painted to specific colour before being shipped to another plant for assembly. In the automotive industry, vehicles are usually assembled from parts shipped by various original equipment manufacturers (OEM) to the assembly plant. The scratches may also appear if on overly rapid quick-drying thinner is used.Quality control is a crucial factor in manufacturing industry as it affects customer satisfaction, reduces production cost and increases profitability. Composite cowling, wood surfaces, and plastic fairings must be properly sanded and sealed before painting. This usually shows up in nonmetal surfaces. Sanding ScratchesSanding scratches appear in the finish paint when the surface has not been properly sanded and/or sealed prior to spraying the finish coats. One last check before spraying is to ensure that the air compressor has been drained of water, the regulator cleaned, and the system filters are clean or have been replaced so that this source of contamination is eliminated. A coat of sealer may help, but completed removal of the finish may be the only solution. Fisheyes may appear during touchup of a repair. If the occasional fisheye appears when spraying, wait until the first coat sets up and then add a recommended amount of fisheye eliminator to the subsequent finish coats. The water should flatten out and cover the area with an unbroken film. If the water beads up anywhere on the surface, it is not clean. Using clean water, spray, pour, or gently hose down the surface to be painted. A simple and effective way to check this is referred to as a water break test.
#FISHEYE PAINT DEFECT FREE#
The most effective way to eliminate fisheyes is to ensure that the surface about to be painted is clean and free from any type of contamination.
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