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Erica Zhu Feilong Jiangli

Cleanliness of automobile parts

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With the development of parts cleaning technology and application, the cleanliness requirements of automotive parts have become particularly stringent. The establishment of cleanliness standards and standards for automotive parts involves five steps and problems: the size of the parts; the nature of pollutants; necessary cleanliness; cleaning process and cleanliness testing and verification.

First, the size of the parts is the basis for designing an efficient cleaning process. Accurate dimension, tolerance and material composition of components are essential parameters. Material in particular should not be neglected, because in the cleaning process, chemicals will produce corrosive physical cleaning will lead to thermal expansion and change the size of parts.

The second step is the quality and quantity of contaminants that need to be washed, which is an important variable of cleanliness. Before cleaning, the cleanliness of components should be tested, such as using a balance as a weighing method to detect the weight of pollutants, using a full-automatic cleanliness testing scanning microscope or laser particle size analyzer to detect the size, quantity, shape, nature of non-corrupt particles, and so on, in order to select a suitable cleaning machine.

Accurate and comprehensive testing of cleanliness to determine the nature and quantity of pollutants is not only the result of sampling, but also related to the reasonable and correct parts cleaning process. Understanding the nature of pollutants helps to better maintain the cleaning machine and extend its service life.

The third step is to determine the cleanliness of the baseline level. The cleanliness level is set on a slightly higher specification. There is no need to set it too high.

The fourth step is to determine the cleaning process.  According to the three elements of mechanical action, chemical reaction and material handling, the cleanliness control process is designed.

The last step is to do an accurate and comprehensive cleanliness test. To use cleanliness testing equipment to do an accurate and comprehensive test of a cleaning process to ensure that the washing machine can reach the clean standard, without damage to parts.

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