The importance of quality management in the whole PCBA patch processing process
2022-11-15
PCBA patch processing involves PCB manufacturing, PCBA supply components procurement and inspection, SMT patch processing, DIP plug-in processing, post-welding processing, program burning, PCBA testing, aging and a series of processing processes. Supply chain and manufacturing chain are long, any link defects will lead to a large number of PCBA board quality is not good, resulting in serious consequences. Therefore, the quality management of the whole PCBA patch processing process is particularly important.
1.PCB circuit board manufacturing
It is particularly important to hold the pre-production meeting after receiving the PCBA patch processing order, mainly through the research and analysis of the processing process based on the PCB drawing file system, and select different students to submit the DFM according to the service requirements of the enterprise customer. Many small manufacturers do not pay attention to this, the result is not only easy to lead to the poor quality of life development problems caused by the poor PCB design effect, but also produce a lot of rework and repair work.
2. Purchase and inspect parts from PCBA
Strictly control the procurement channels of parts, obtain goods from large traders and original factories, and avoid using second-hand materials and counterfeit materials. In addition, a special PCBA incoming inspection post should be set up to strictly inspect the following items to ensure that the parts are trouble-free.
①PCB: Check the temperature test of reflux furnace, whether there is blockage of fly wire hole or ink leakage, whether the board surface is bent, etc.
② Check whether the screen printing is completely consistent with the typesetting, and keep the constant temperature and humidity.
③ Other enterprises commonly used building materials: check through screen printing, appearance, power measurement value, etc.
3.SMT assembly
Slurry printing and furnace temperature control are the key links of SMT assembly. Laser steel mesh with high quality requirements is needed to meet the processing requirements. According to the requirements of PCB board, some steel mesh needs to be increased or reduced, or U-shaped holes, you can make steel mesh according to the process requirements. The temperature control of the reflux furnace is essential for ointment wetting and PCBA welding and can be adjusted according to the normal SOP operating guidelines.
In addition, strict implementation of AOI testing can greatly reduce the defects caused by human factors.
4. Plug-in processing
In the process of plug-in machining, the details of wave soldering die design are the key. How to use the mold frame to greatly improve the rate of finished products is the process experience that PE engineers must constantly practice and summarize.
5. Program burning
In the previous DFM report, the customer could be advised to set up some test points (test points) on the PCB to test the continuity of the PCBA circuit after welding all components. If possible, you can ask the customer vendor to burn the program into the main integrated circuit, and you can more intuitively test various touch actions to verify the integrity of the overall PCBA functionality.
6. Test the PCBA
For the orders with PCBA test technical requirements, the main test contents include ICT (circuit system test), FCT (functional analysis test), aging test, temperature and humidity control test, drop test, etc.
1.PCB circuit board manufacturing
It is particularly important to hold the pre-production meeting after receiving the PCBA patch processing order, mainly through the research and analysis of the processing process based on the PCB drawing file system, and select different students to submit the DFM according to the service requirements of the enterprise customer. Many small manufacturers do not pay attention to this, the result is not only easy to lead to the poor quality of life development problems caused by the poor PCB design effect, but also produce a lot of rework and repair work.
2. Purchase and inspect parts from PCBA
Strictly control the procurement channels of parts, obtain goods from large traders and original factories, and avoid using second-hand materials and counterfeit materials. In addition, a special PCBA incoming inspection post should be set up to strictly inspect the following items to ensure that the parts are trouble-free.
①PCB: Check the temperature test of reflux furnace, whether there is blockage of fly wire hole or ink leakage, whether the board surface is bent, etc.
② Check whether the screen printing is completely consistent with the typesetting, and keep the constant temperature and humidity.
③ Other enterprises commonly used building materials: check through screen printing, appearance, power measurement value, etc.
3.SMT assembly
Slurry printing and furnace temperature control are the key links of SMT assembly. Laser steel mesh with high quality requirements is needed to meet the processing requirements. According to the requirements of PCB board, some steel mesh needs to be increased or reduced, or U-shaped holes, you can make steel mesh according to the process requirements. The temperature control of the reflux furnace is essential for ointment wetting and PCBA welding and can be adjusted according to the normal SOP operating guidelines.
In addition, strict implementation of AOI testing can greatly reduce the defects caused by human factors.
4. Plug-in processing
In the process of plug-in machining, the details of wave soldering die design are the key. How to use the mold frame to greatly improve the rate of finished products is the process experience that PE engineers must constantly practice and summarize.
5. Program burning
In the previous DFM report, the customer could be advised to set up some test points (test points) on the PCB to test the continuity of the PCBA circuit after welding all components. If possible, you can ask the customer vendor to burn the program into the main integrated circuit, and you can more intuitively test various touch actions to verify the integrity of the overall PCBA functionality.
6. Test the PCBA
For the orders with PCBA test technical requirements, the main test contents include ICT (circuit system test), FCT (functional analysis test), aging test, temperature and humidity control test, drop test, etc.