When we drill PCB, we all know that there is a cover plate on the base plate, which is mainly used to protect the PCB surface from indentation. It can not only reduce burr, but also prevent the drill from slipping on the copper surface during drilling, and reduce or avoid hole position error. In addition, not all PCB drilling uses the same cover plate. That is to say, different PCB drilling holes need to use different thickness of cover plate and pad. So what problems do we have when drilling? Xiaobian Xiaobian and everyone to briefly explain the next Oh.
1. Prevent holes from shifting.
That is to say, the drill bit is offset during the drilling process, or the material of the cover material is not suitable. The base material generates shrinkage due to the deviation of the hole position, the resonance occurs during the operation of the drill bit, the spring chuck is not clean or damaged, and the production plate or panel deviates from the hole position or the whole stack position; the drill bit slides during the operation of the contact cover plate.
2. Avoid missing drilling
The broken drill nozzle is not clearly identified, or is temporarily suspended, unintentionally deleted, and the drill machine reads data while reading.
3. Avoid the criticism
The main reason is that the drill bit is seriously worn, there are sundries between the base plate and the base plate, and there are gaps formed by the bending deformation of the base plate.
At present, the design aperture needs to be increased when mechanical drilling is produced, and the 0.15mm needs to be enlarged. The gold board needs to increase the 0.1mm, but it should be noted that when the diameter increases, the distance between such holes to the line and the copper skin can not meet the processing requirements. We must take into account that if the pad is not properly spaced and the CAM engineers can no longer increase, the panel will not be processed.
These are the problems that often occur in the production of PCB drilling. In practice, we should measure more and check more, and strictly follow the specifications. This is also a great benefit to control the quality of drilling production, and it will also help improve product quality and improve production efficiency.
