A coating that is too thick or too thin will result in defects. We will explain the management of film thickness from three aspects: dimensions, rust, and appearance.
Poor film thickness is a complaint factor that is often overlooked in visual inspections. A coating that is too thin reduces corrosion resistance, while a coating that is too thick can lead to assembly issues at screw parts, fitting parts, and around holes. In other words, film thickness is a management item that affects rust, appearance, and dimensions. Particularly in automotive parts, even a slight difference in thickness after painting can impact assembly and operation. Initially, we check for deviations from the standard values, measurement locations, production lots, and part shapes. The countermeasures involve determining measurement locations, frequency, standard values, and recording methods, as well as understanding where paint adheres easily for each part shape. If the measurement locations change every time within a lot, trends become difficult to see. By fixing the measurement points and comparing them with the production lot, it becomes easier to identify the causes. Managing film thickness also helps prevent dripping, color unevenness, and hole filling. Please utilize check materials for film thickness verification. It is more important to consistently measure the same location than to measure itself. Comparable records will serve as materials for cause investigation.