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What is the specific process of SMT patch?

2022/10/31

  SMT is a surface mount technology. It is a very common technology and process in various manufacturing and processing industries. SMT chip processing is based on PCB boards. First, solder paste is printed on the pads of the bare board of the PCB board. Then use a placement machine to attach the components to the pads of the PCB board, and then flow the PCB board into reflow soldering for soldering. SMT patch production is a series of processes that attach components to the bare PCB board.


  The basic elements of the SMT patch process: silk screen, inspection, patch, reflow, cleaning, inspection, maintenance.

1. Silkscreen: You need to play with the steel mesh, and print the solder paste on the pads of the PCB board to prepare for the next step of soldering components.

2. Inspection: Check the quality of the solder paste printing on the printing machine, and then look at the thickness of the tin on the PCB board and the position of the solder paste printing. Use the SPI solder paste thickness gauge to check whether the solder paste printing is flat and the thickness is consistent. No displacement, sharpening and other phenomena.

3. Patch: Use the smt mounter to precisely install the components that need to be assembled on the surface on the fixed position of the PCB.

4. Reflow soldering: Its function is to melt the solder paste, so that the components on the surface mount and the PCB board are tightly bonded together. It's behind the pick and place machine.

5. Cleaning: After reflow soldering, there will be a lot of dirty soldering residues on the PCB board. It is necessary to use a cleaning machine or manually to clean the PCB board to achieve a clean and tidy purpose.

6. Inspection: After the production is completed, it is necessary to check whether there is any problem with the welding of the PCB board in the machine equipment such as online tester ICT, AOI, magnifying glass, etc. The board with the problem needs to be picked out for repair.

7. Maintenance: The PCB board that detects the fault needs to be tested to find the fault for repair and rework. Make sure that the PCBA boards produced are normal.

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