PCBA refers to the process of mounting, inserting and soldering bare PCB components. The production process of PCBA needs to go through a series of processes to complete the production. Now, PCBFuture will introduce the various processes of PCBA production.
PCBA production process can be divided into several major processes, SMT patch processing→DIP plug-in processing→PCBA testing→finished product assembly.
First, SMT patch processing link
The process of SMT chip processing is: solder paste mixing→solder paste printing→SPI→mounting→reflow soldering→AOI→rework
1, solder paste mixing
After the solder paste is taken out of the refrigerator and thawed, it is stirred by hand or machine to suit printing and soldering.
2, solder paste printing
Put the solder paste on the stencil, and use squeegee to print the solder paste on the PCB pads.
3, SPI
SPI is the solder paste thickness detector, which can detect the printing of solder paste and control the printing effect of solder paste.
4. Mounting
SMD components are placed on the feeder, and the placement machine head accurately places the components on the feeder on the PCB pads through identification.
5. Reflow soldering
Pass the mounted PCB board through the reflow soldering, and the paste-like solder paste is heated to liquid through the high temperature inside, and finally cooled and solidified to complete the soldering.
6.AOI
AOI is automatic optical inspection, which can detect the welding effect of PCB board by scanning, and detect the defects of the board.
7. repair
Repair the defects detected by AOI or manual inspection.
Secondly, DIP plug-in processing link
The process of DIP plug-in processing is: plug-in → wave soldering → cutting foot → post welding process → washing board → quality inspection
1, plug-in
Process the pins of the plug-in materials and insert them on the PCB board
2, wave soldering
The inserted board is subjected to wave soldering. In this process, liquid tin will be sprayed onto the PCB board, and finally cooled to complete the soldering.
3, cut feet
The pins of the soldered board are too long and need to be trimmed.
4, post welding processing
Use an electric soldering iron to manually solder the components.
5. Wash the plate
After wave soldering, the board will be dirty, so you need to use washing water and washing tank to clean it, or use machine to clean.
6, quality inspection
Inspect the PCB board, the unqualified products need to be repaired, and only the qualified products can enter the next process.
Third, PCBA test
PCBA test can be divided into ICT test, FCT test, aging test, vibration test, etc.
PCBA test is the big test. According to different products and different customer requirements, the test methods used are different.
Fourth, finished product assembly
The tested PCBA board is assembled for the shell, and then tested, and finally it can be shipped.
PCBA production is one link after another. Any problem in any link will have a very large impact on the overall quality, and strict control of each process is required.
Post time: Oct-21-2020