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09
2023
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05
Cleanliness particle detection: What variables should be paid attention to in the particle collection process?
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With the emergence of cleanliness standards, cleanliness particle detection is becoming more and more standardized, whether it is national standards, industry standards or foreign standards (VDA19, ISO16232), has its own cleanliness particle detection methods. Therefore, as far as possible, the customer is required to provide clear criteria and select the corresponding measurement method according to the customer's requirements. The following cleanliness particle detection and collection methods are for reference:
1. Shaking method
The shaking method is relatively simple, that is, the particles contained in the surface are sealed, and the appropriate type and volume of cleaning liquid are injected into the part or component to be tested, and the opening is sealed, so that the particles are separated from the controlled inner surface and suspended in the cleaning liquid. All cleaning solution should be drained immediately after shaking and collected for analysis.
The main process variables that need to be controlled are: the volume and temperature of the cleaning solution and its associated properties, the type and period of shaking the cleaning solution, the number of sample collections including the endpoint sample, and the volume of cleaning solution collected for analysis.
The size and quality of the part, the measurement tools required and any auxiliary equipment needed to facilitate particle collection should be considered.
2. Pressure flushing method
Pressure cleaning is the removal of particles from exposed or accessible surfaces by the directional spray of cleaning fluid onto the surface of a part or component placed on a particle collection device. Immediately after washing, all cleaning fluids used in the test should be collected for analysis.
The main process variables that need to be controlled are: the volume and temperature of the test solution and its associated properties, the pressure and flow rate of the cleaning solution, the cleaning sequence of the part or component, the number of samples collected including the endpoint sample, and the volume of cleaning solution collected for analysis.
The overall washability of the surface of the part should be considered, the size and quality of the part or component, the measurement tools required, and any auxiliary equipment needed to facilitate particle collection.
3. Ultrasonic vibration method
The ultrasonic vibration method is to immerse the part in the cleaning liquid, apply ultrasonic vibration, and peel off the particles on the surface that can be reached by the ultrasonic vibration. As soon as a part or assembly is removed from the ultrasonic cleaning tank, all cleaning fluids used in the test should be collected for analysis.
The main process variables to be controlled are: the volume and temperature of the cleaning fluid and its associated properties, the equipment power, the exposure time in the ultrasound, the number of samples collected including the final sample, the volume of the cleaning solution collected for analysis, the effect of stripping separable particles from the surface of the part or component, and the effect of collecting samples from the ultrasonic cleaning tank for analysis.
The size and quality of the part or assembly should be considered, which is related to the capacity of the ultrasonic cleaning tank. At the same time, the shape of the part or component should also be considered, which will affect the cleaning effect of the ultrasonic cleaning tank.
Related Information
2025-09-03
2023-05-09
2023-05-09
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