What are the Precautions for China PCB Assembly Processing Process?
China PCB assembly processing flow is to generate process documents and coordinate documents according to Gerber documents and BOM provided by customers, make plans, prepare materials completely, and start manufacturing according to requirements after confirming that there is no problem. Pay attention to that employees should wear anti-static gloves, China printed circuit board assembly substrates should be placed neatly, and bare plates cannot be stacked directly. Next, let's introduce the China PCB assembly processing process and the precautions.
1、PCB assembly processing flow
1.printed circuit board assembly processing technology makes SMT production process files and generates SMT coordinate files according to customer Gerber files and BOM.
2. Check whether all production materials are prepared, make a complete set of sheets, and confirm the PMC plan of production.
3. Carry out SMT programming and make the first board for verification to ensure that it is correct.
4. China PCB assembly processing process: laser steel mesh shall be made according to SMT process.
5. Solder paste printing shall be carried out by printed circuit board assembly processing technology to ensure that the printed solder paste is uniform, good thickness and consistent.
6. Mount the components on the circuit board through the SMT Mounter, and conduct online AOI automatic optical detection if necessary.
7. Set the perfect reflow furnace temperature curve, let the circuit board reflow, and the solder paste is transformed from paste and liquid to solid. Good welding can be achieved after cooling.
8. PCB assembly processing technology has undergone necessary IPQC intermediate inspection.
9. Dip plug-in process passes the plug-in material through the circuit board, and then flows through wave soldering for welding.
10. Necessary post furnace processes, such as foot cutting, post welding, plate surface cleaning, etc.
11. QA conducts comprehensive inspection and China printed circuit board assembly processing technology to ensure quality.
2、Precautions for PCB assembly processing
1. The warehouse keeper shall wear anti-static gloves when issuing materials and detecting IQC, and the instrument shall be reliably grounded, and the worktable shall be paved with anti-static rubber pad in advance.
2. In the process of operation, anti-static worktops shall be used, and anti-static containers shall be used to hold components and semi-finished products. Departmental welding equipment can be grounded, electric soldering iron shall be of anti-static type, and all equipment shall be tested before use.
3. When China PCB assembly is processed through the furnace, because the pins of plug-in elements are washed by tin flow, some plug-in elements will tilt after furnace welding, resulting in the element body exceeding the silk screen frame. Therefore, the repair welding personnel after the furnace are required to correct it properly.
4. Whenprinted circuit board assembly is welding horn and battery, it shall be noted that the solder joint shall not be too much, which shall not cause short circuit or falling off of surrounding components.
5.China PCB assembly substrates shall be placed neatly, and bare plates cannot be stacked directly. If they are to be stacked, they shall be packed with electrostatic bags.
The above is the China printed circuit board assembly processing process and the precautions? I hope today's summary can help you.
