In the PCB production process, in order to consider subsequent patches and plug-ins, process edges are generally added, and it will also increase procurement costs. Then, what are the benefits of adding this process edge? Here I will explain in detail a bit.

　　In the PCB production process, the reservation of the process edge is of great significance for the subsequent SMT chip processing. The process side is to assist the soldering of the chip plug-in board to take the added part of the PCB board on both sides or four sides. It is mainly used to assist the production and is not part of the PCB board. It can be removed after the PCBA manufacturing is completed.

　　Because the process side will consume more PCB boards, it will increase the overall cost of the PCB. Therefore, when designing the PCB process side, it is necessary to balance economy and manufacturability. For some special-shaped PCB boards, the original PCB board with 2 process edges or 4 process edges can be greatly simplified through the method of splicing. When designing the splicing method in patch processing, it is necessary to fully consider the track width of the SMT placement machine. For splicing boards with a width of more than 350mm, it is necessary to communicate with the process engineer of the SMT supplier.

The main reason for leaving the process side is that the track of the SMT placement machine is used to clamp the PCB board and flow through the placement machine, so the components that are too close to the track side are sucked in the nozzle of the SMT placement machine and mounted to When the PCB board, the phenomenon of collision occurs, and the production cannot be completed, so a certain process edge must be reserved, such as 2-5mm and so on. The same applies to some plug-in components to prevent similar phenomena during wave soldering.

　　The flatness of the PCB production process edge is also an important part of the PCB production. When removing the PCB production process edges, it is necessary to ensure that the process edges are flat, especially for PCBs that require extremely high assembly accuracy. Any uneven burrs will cause the mounting holes to shift, which will bring great consequences to subsequent PCBA assembly. trouble.