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What is SPC?
SPC stands for Statistical Process Control (Statistical Process Control). SPC mainly refers to the application of statistical analysis technology to real-time monitoring of the production process, scientifically distinguishing random fluctuations and abnormal fluctuations in product quality during the production process, so as to provide early warning of abnormal trends in the production process, so that production managers can take timely measures to eliminate Abnormal, the recovery process is stable, so as to achieve the purpose of improving and controlling the quality.
In the PCBA production process, the fluctuation of the product's processing size is inevitable. It is caused by the fluctuation of basic factors such as people, machines, materials, methods,
and the environment. There are two types of fluctuations: normal fluctuations and abnormal fluctuations. Normal fluctuations are caused by accidental reasons (unavoidable factors). It has little impact on product quality, is technically difficult to eliminate, and it is not worth eliminating economically. Abnormal fluctuations are caused by system reasons (abnormal factors). It has a great impact on product quality, but measures can be taken to avoid and eliminate it. The purpose of process control is to eliminate and avoid abnormal fluctuations, so that the process is in a state of normal fluctuations.
What is the role of SPC in PCBAproduction?
1. Product category and product information
Each PCBA processing company is different and has different characteristics, so it needs to be flexible when planning product categories and materials. Product categories can be classified according to the characteristics of your company's products. For example, some companies have made a distinction between semi-finished products and finished products.
2, inspection and inspection station
The role of the inspection department is mainly to check the inspection of the product, and to diagnose whether the product is qualified or not. The quality inspection can evaluate the quality of the product and troubleshoot the problem. It is not the responsibility of the inspection department to investigate the reasons, how to achieve the qualification and improve the quality of the products, it is the matter of the technical department and the production department.
In the early stage of the SPV project design, it is necessary to identify and define the inspection station of the product or material, so that the station or stage where the problem occurs can be quickly found during the work.
3, bad category and code definition
In the PCBA production process, there will be many bad situations, such as printing positioning, solder paste plug holes, component deviation, open circuit, tin beads, etc.; the defined bad categories must be unified and uniformly identified and used within the company to facilitate the During the implementation of the SPC project, everyone can clearly identify the bad categories and need to unify the bad classifications, so as to reduce the divergence caused by the unknown nature of the problem in determining the problem and solving the problem.
