Metal parts will be polluted by oil, coolant, polishing fluid, etc. during processing, which will affect the quality of subsequent processes such as welding, gluing, spraying, and electroplating. Welding pores, weak glue, paint film peeling, surface defects of the coating, decreased electrical conductivity, etc. are all caused by unclean cleaning. It can be seen that the cleaning of parts is an important process that cannot be ignored in industrial production.
How to reflect the effectiveness of the cleaning process? A company produces transformers and processes copper rods supplied by customers. The copper rods cleaned with alcohol were first sandblasted and then poured with resin. It is found that the effect of pouring resin is not as good as expected, and the sticking effect is not good. Is it the influence of the cleanliness of the copper rod provided by the supplier or the problem of the resin itself? Does the copper rod provided by the supplier meet the cleanliness requirements? In order to verify these problems, the customer hopes to use the SITA Cleanospector cleanliness instrument as a quality control method to test the cleaning quality supplied by the supplier.
The Cleanospector cleanliness instrument developed by SITA in Germany is currently the only instrument in the world that can quantify the surface cleanliness of metals, ceramics, and glass. The cleanliness meter adopts the principle of fluorescence to quantitatively measure the pollution degree of the metal surface, and the reading unit is RFU (relative to the total amount of fluorescence, the larger the reading, the more serious the pollution).
testing sample:
Unsandblasted copper rods and sandblasted copper rods are all ultrasonically cleaned with alcohol
The result of the test :
(below chart)
Result analysis:
1. After cleaning the unsandblasted copper rod with alcohol, the RFU value is still high, that is, the degree of pollution is still very high, and alcohol cleaning has little effect on the cleanliness of the copper rod;
2. After sandblasting, the RFU value of the copper rod is greatly reduced, but it still does not meet the cleanliness requirements.
Conclusion
The copper rods provided by the supplier have a high degree of pollution, and the process of alcohol cleaning has no effect on the cleaning of the copper rods.
From the above cases, we can see that detecting the cleanliness of the workpiece and verifying the effectiveness of the cleaning process can help to understand the product, avoid blind operation, and reduce daily costs.
