PCB Tech - What are the precautions for PCBA processing flow?

The PCBA processing process is to generate process files and coordinate files based on the Gerber files and BOMs provided by the customer, make a plan, prepare the materials, and confirm that there are no problems, and then start the system according to the requirements.

The PCBA processing process is to generate process files and coordinate files based on the Gerber files and BOMs provided by the customer, make a plan, prepare the materials, and confirm that there are no problems, start to make according to the requirements, pay attention to the staff to wear anti-static gloves, PCBA substrates are required Place neatly, bare boards cannot be stacked directly. Next, I will introduce the PCBA processing process and what are the precautions.

1. PCBA processing flow

1. PCBA processing technology According to the customer's Gerber file and BOM list, the process file of smt production is made, and the SMT coordinate file is generated.

2. Check whether all production materials are ready, make complete sets of orders, and confirm the PMC plan for production.

3. Carry out SMT programming and make the first board for verification to ensure that it is correct.

4. PCBA processing technology is based on SMT technology to make laser steel mesh.

5. PCBA processing technology is used for solder paste printing to ensure that the solder paste after printing is uniform, good thickness, and consistent.

6. Use the SMT placement machine to mount the components on the circuit board, and perform online AOI automatic optical inspection if necessary.

7. Set a perfect reflow soldering furnace temperature curve to allow the circuit board to undergo reflow soldering, and the solder paste will be transformed from a paste and liquid state to a solid state, and good soldering can be achieved after cooling.

8. PCBA processing technology has passed the necessary IPQC inspection.

9. The DIP plug-in process passes the plug-in material through the circuit board, and then flows through wave soldering for soldering.

10. Necessary post-furnace processes, such as foot trimming, post welding, board surface cleaning, etc.

11.QA conducts comprehensive testing, PCBA processing technology ensures quality.

Two, PCBA processing precautions

1. Warehouse personnel wear anti-static gloves when distributing materials and testing IQC, use the meter to reliably ground, and the work surface needs to be covered with anti-static rubber pads in advance.

2. During the operation, use an anti-static work surface, and use an anti-static container to hold the components and semi-finished products. The department welding equipment can be grounded. The electric soldering iron needs to be anti-static. All equipment must be tested before use.

3. When PCBA is processed through the furnace, because the pins of the plug-in components are washed by the tin flow, some plug-in components will be tilted after the furnace is soldered, causing the body of the component to exceed the silk screen frame, so the repair welding personnel after the tin furnace are required to do it Correct appropriately.

4. When PCBA is soldering speakers and batteries, please note that the solder joints should not be too much tin to cause short-circuit or fall off of surrounding components.

5. PCBA substrates must be placed neatly, bare boards cannot be stacked directly, and electrostatic bags must be used for stacking.