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With the continuous updating and development of digital products such as smart phones, the surface treatment process of mobile phone casings adopts more new technologies. There are new requirements for the appearance and performance of the mobile phone case. Many manufacturers encounter new challenges in the new surface treatment process. This article mainly introduces the new cleaning process control and quality inspection methods to improve the quality stability of the surface treatment process.
At present, the full metal casing of 3C products is processed by CNC machine tools (CNC), and the mobile phone case is sandblasted and anodized after being processed by CNC machine tools. Generally, the manufacturer will have a cleaning process before sandblasting and anodizing to clean a large amount of cutting oil and cutting fluid used in the CNC process to avoid poor adhesion and uneven color in the subsequent sandblasting and anodizing processes. problem. How do you determine if the phone case has been cleaned for the next step? Is the cleaning process efficient and reliable?
Case:
The cleaning line of a well-known mobile phone manufacturer first has a degreasing tank. After the CNC processing, the parts of the mobile phone case will be degreased first, then rinsed 5 times to ensure no residue of grease and cleaning agent, and then sprayed and air dried. Ensure that the cleanliness of the housing meets the requirements and proceed to the next step. The cleanliness test uses a surface cleanliness instrument developed by SITA, Germany, which quantifies the cleanliness of the surface of the output metal, ceramics, glass, etc. The reading is in RFU (relative fluorescence unit, the higher the reading, the more serious the contamination) Said. 
SITA surface cleanliness meter
The following table data is the cleanliness of the cleaned casing measured after 25, 30, 50, 60 hours of continuous use of the degreasing tank without replacing the bath. Each mobile phone case is tested for 30 points. The red data is the point at which the housing fails (RFU reading is greater than or equal to 4). It can be seen from the data that the longer the bath is used, the more and more unqualified points appear later, which means that the cleanliness of the shell becomes lower and lower, and it is necessary to consider supplementing the cleaning agent according to the consumption of the cleaning agent. , or replace the bath, or perform additional cleaning on samples with poor cleaning quality. Otherwise it will seriously affect the quality of the subsequent processes. 
Number of unqualified points tested at each time point
The German SITA Surface Cleanliness Meter quantifies the cleanliness of the workpiece, verifies the effectiveness of the cleaning process, provides detailed and reliable data, helps optimize the cleaning process, stabilizes production quality and reduces production costs. An online version of the production line is available now. For free testing, you can apply at https://jc.hjunkel.com.
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Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn