How to do FPC assembly well

If you want to achieve multi-function simultaneous operation on a small circuit board, it cannot be done with a bare PCB board alone. The bare board needs to be mounted, plugged in and welded. This step-by-step process requires Call it a flexible circuit board assembly. The following are the various processes of flexible circuit board assembly production.

In terms of technology, the process flow of flexible circuit board assembly can be roughly divided into four main links, namely: SMT Assembly processing → DIP plug-in processing → flexible circuit board assembly testing → finished product assembly.

1. SMT assembly processing link

(1)In the SMT chip processing process, the components are generally matched and purchased according to the BOM configuration provided by the customer, and the PMC plan of the production is confirmed. After the preparatory work is completed, SMT programming is started, laser stencils are made according to the SMT process, and solder paste printing is performed.

(2)Through SMT placement machine, components are mounted on the circuit board, and online AOI automatic optical inspection is performed if necessary. After inspection, set the perfect reflow oven temperature profile and let the board flow through reflow.

(3)After the necessary IPQC inspection, the plug-in material can then be passed through the circuit board using the DIP plug-in process and then flowed through wave soldering for soldering. Then there is the necessary post-furnace process.

(4)After the above processes are completed, QA is also required to conduct a comprehensive inspection to ensure product quality.

2. DIP plug-in processing link

The process of DIP plug-in processing is: plug-in → wave soldering → foot cutting → post-soldering processing → board washing → quality inspection.

3. Flexible circuit board assembly test

(1)Flexible circuit board assembly test The most critical quality control link in the entire flexible circuit board assembly processing process, it is necessary to strictly follow the flexible circuit board assembly test standards, and test the test points of the circuit board according to the customer's test plan (Test Plan). .

(2)Flexible circuit board assembly testing also includes 5 main forms: ICT testing, FCT testing, aging testing, fatigue testing, and testing in harsh environments.

4. Finished product assembly

(1)Assemble the shell of the FPC that has been tested OK, and then test it, and finally it can be shipped.

(2)SMD production of flexible circuit boards is a chain, and any problems in any link will have a great impact on the overall quality, and each process needs to be strictly controlled.

The above are the four main links about the SMT production of flexible circuit boards. Each major link has countless small links to assist, and each small link will have one or some testing procedures to ensure product quality and avoid unqualified products. The outflow of the product from the factory.

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