[Single vibration pattern of the frosted board] Quality objection handling
A customer purchased a batch of dry-ground HL 304 sheets from a processor. During the inspection on arrival, it was found that there was an obvious lateral chromatic aberration in the fixed position of the board, which affected the subsequent use. Therefore, the customer raised a quality objection to the processor.
The merchant attaches great importance to this problem and immediately dispatched a technician to cooperate with the customer to solve the problem. After an on-site inspection, it was found that the color difference was located at 500mm of the head of the board, which was horizontally distributed, and the color was darker than other parts. After inspection, the technician preliminarily judged that it was a vibration pattern produced during the dry grinding of HL.
Vibration marks are a common problem in dry sanding. There are many reasons for them, and the vibration marks reflected are also different.
This single vibration pattern is displayed in the vibration pattern, and the grinding force or time of the sand roller is different from other parts, so the grinding degree of the surface of the vibration pattern is different from other parts, and the color is different.
After the technician returned to the company, he reported the existing problems to the company. The company arranged to inspect the HL sanding machine and found that the problem was with the second set of sanding rollers. The first and second sets of frosting rollers are driven by the same motor and driven by chains. Due to the looseness of the chain, there is a phenomenon of out-of-synchronization during conveying. When the steel plate is sent to the second set of sanding rollers, the speed is suddenly blocked and slightly stagnated. Although the stagnation time is very short, the grinding volume at the first set of sand rollers is still slightly larger, resulting in chromatic aberration.
The distance between the chromatic aberration and the plate head is consistent with the distance between the two sets of sand rollers, which also verifies this judgment.
The merchant then adjusted the tension of the conveyor chain of the grinder to synchronize the sand rollers, easily solving the problem and avoiding such problems in the future.