PCB boarding is an important part of PCB design. However, many designers are reluctant to do this work because of the sandpaper grinding plate (which is a harmful work type) and the drawing line (which is a simple repetitive work). Even many designers believe that PCB boarding is not technical work, and junior designers can do the job with a little training. This concept has some universality, but as with many jobs, there are some tricks in the PCB boarding. If the designer masters these techniques, it can save a lot of time and can also greatly reduce the amount of labor. The following Baien network Xiaobian will talk about this knowledge in detail.
PCB board concept
The PCB board sectioning process refers to the process of obtaining the schematic diagram and the board diagram (PCB diagram) according to the original PCB board. Its purpose is to carry out later development. Post-development includes installation of components, deep testing, and modification of circuits. Because it is not related to the scope of PCB boarding, it is not described in detail.
PCB board cutting process
1. Remove the device from the original board.
2. Scan the original board to get a graphic file.
3. Grind the surface layer to obtain the intermediate layer.
4. Scan the middle layer to get the graphic file.
5. Repeat steps 2-4 until all layers have been processed.
6, using special software to convert the graphic file into an electrical relationship file --- PCB diagram. If you have the right software, the designer just has to trace the graphics.
7. Check the check and complete the design.
PCB board cutting skills
The cutting of PCB boards, especially the cutting of multilayer PCB boards, is a time-consuming and laborious task that involves a lot of repetitive work. Designers must have enough patience and care, otherwise it is very easy to make mistakes. The key to making a good PCB design is to use the right software instead of manual repetitive work, which is time-saving and accurate.
1. Always use the scanner during the cutting process.
Many designers are accustomed to drawing lines directly on PCB design systems such as PROTEL, PADSOR or CAD. This habit is very bad. The scanned graphic file is the basis for conversion to a PCB file and the basis for later inspection. The use of scanners can greatly reduce the difficulty and intensity of labor. It is no exaggeration to say that if you can make full use of the scanner, even if you have no design experience, you can complete the PCB boarding work.
2, single direction grinding plate.
In order to pursue speed, some designers choose a two-way grinding plate (that is, grinding the plate layer from the front and rear surfaces to the middle layer). In fact, this is very wrong. Because the two-way grinding plate is very easy to wear through, causing damage to other layers, the results can be imagined. The outer layer of the PCB is the hardest due to the process and the presence of copper foil, pads, etc., and the middle layer is the softest. So to the middle layer, the problem is more serious and often cannot be polished. In addition, the PCB material, hardness and elasticity produced by various manufacturers are not the same, and it is difficult to accurately remove them.