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PCB puzzle is a problem that needs to be dealt with in the process of PCBA processing. After the PCB design engineer has determined the shape of the PCB, the circuit board can be designed as a jigsaw. For most circuit boards, splicing can improve production efficiency and reduce board loss. Since there are so many benefits of panel joints, how to set the number of panels in PCBA processing, and what factors need to be considered?
Common Jigsaw Method
There are many ways to assemble circuit boards, such as two-in-one, three-in-one, four-in-one, etc. The more common one is to assemble a large circuit board with more than two pieces of the same circuit board; it can also be done with circuit boards of different shapes Jigsaw, but the application is relatively small, mainly because it is difficult to match the number of boards of different shapes during production; the positive and negative sides of the same kind of circuit board are assembled into a circuit board, which can improve SMT chip processing Efficiency, suitable for circuit boards with a small number of components.
The Yin-Yang board design is not suitable for all circuit boards. If heavier components are designed on one side of the circuit board, the use of the Yin-Yang board may cause the heavy parts to fall when the side is used as the second part. There are also boards with large-area heat-absorbing components on the board, and the yin and yang board design cannot be used. The disadvantage of yin-yang board is that there are restrictions on SMT processing, which can easily cause uneven heating. It is necessary to consider various factors in the specific way of splicing.
The impact of board making cost on the number of jigsaw puzzles
Board-making cost is the most important factor used to measure the number of jigsaw puzzles. In order to improve production efficiency and reduce costs, circuit board manufacturers will have basic standard board sizes. These standards repeatedly consider the best utilization of circuit board boards. Common standards are 16.16"x16.16", 18.32"x18.32", 20.32"x20.32",... etc. The cost of the circuit board will be affected by the size of the board used. Choosing the most suitable standard board to achieve the optimal utilization of the board can reduce the production cost of the circuit board. The cost of the circuit board is also related to factors such as the number of layers of the board, the number of holes, and whether there are blind and buried vias.
The effect of SMT patch processing efficiency on the number of puzzles
SMT processing line is divided into long line and short line according to different requirements. There are at most two fast placement machines and one slow placement machine for short-term lines; there are usually multiple fast placement machines and slow-speed placement machines for long-term lines. Usually each line is equipped with a solder paste printing machine. It takes about 35-40 seconds to brush the solder paste on the board with a length of 150mm. The two-in-one board is processed in SMT short-term, and the time allocated for each machine is about 10-26 Seconds, the placement time is much lower than the solder paste printing time, indicating that the placement machine is waiting for the solder paste printing machine, and the production capacity of the placement machine is not fully utilized.
Summarize
PCB factories usually hope that the fewer the number of panels, the better, because the less the number of panels, the less chances of X boards will be generated, which can reduce the scrap rate and reduce the cost of board manufacturing. SMT factories also don't like to hit X boards, because hitting X boards will reduce the efficiency of processing. Therefore, we still have to calculate the most affordable number of panels from the perspective of overall PCBA processing costs. The process capabilities of PCB factories and SMT factories also have an impact on this. In addition, consider whether to use the V-cut or Router process to remove the edge of the board, which will also affect the panel design.
