According to the principle of resolving defects, we must first clarify the following three issues:
(1) What has changed?
(2) How much is the change?
(3) Why did this change occur?
Principle for solving defects before painting
(1) To find out whether it is an equipment problem or a pharmaceutical problem, the method of judging can be to change the equipment by treating the chemical before painting. This makes it easy to identify the problem.
(2) Clarify the process and the scope of the defect. If the defect proves to be in the pre-treatment treatment, then try to determine the process that caused the defect.
(3) Differentiate between degreasing and phosphating. This is extremely important for judging the occurrence of defects.
(4) Keep complete and accurate original records to prevent similar failures from happening repeatedly.
(5) Treatment of one defect and one defect.
In order to clarify these problems, you can generally check the following steps.
(1) Check separately whether the process index of each tank fluid is within the process range, and test the index of the tank fluid.
(2) Check the temperature and pressure of the bath fluid. When necessary, the thermometer can be used for manual testing to eliminate the error caused by the temperature measuring instrument.
(3) Check whether the work of the operator is correct.
(4) Check whether the workpiece is replaced with anti-rust oil or lubricant.
(5) Check the water used.
(6) Check the process, the pressure of each process, and the water temperature of the washing tank.
(7) Check whether the temperature meets the requirements? Are the meters and records accurate?
(8) Check whether the process conditions and equipment maintenance system are adhered to.
(9) If it is a spray process, check whether the nozzle is blocked, whether it is adjusted, and whether it is properly lubricated between processes.
(10) Check if the transmission speed is normal and there is no change.
(11) Check whether the medicine in the field project has changed.
(12) Check if the bath is overloaded or exhausted.
(13) Check if the type of workpiece changes. If it is changed, the device should be properly clamped or improved.
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