How to set the number of PCB panels

How to set the number of PCB panels

Next, Shenzhen Xingruixiang, a PCBA processing factory, will introduce it to you. There are many common ways to assemble boards, such as two in one, three in one, four in one, etc. It is common to assemble two or more identical boards into a large circuit board; Different shapes of circuit boards can also be used for splicing, but the application is relatively small, mainly because it is difficult to match the number of boards with different shapes during production; The cathode and anode board is a circuit board composed of the positive and negative sides of the same circuit board. The cathode and anode board can improve the SMT chip processing efficiency and is suitable for circuit boards with fewer components.

The design of male and female boards is not suitable for all circuit boards. If heavy components are designed on one side of the circuit board, the use of male and female boards may cause heavy parts to fall off when the side is used as the second punching part. There are also boards with large area of heat absorbing components on the board that cannot be designed with the combination of yin and yang boards. The disadvantage of the male and female plates is that SMT processing is limited, which is easy to cause uneven heating. It is necessary to comprehensively consider all aspects of factors to determine which splicing method to use. The influence of the cost of board making on the number of panels; the cost of board making is the most important factor to measure the number of panels. In order to improve production efficiency and reduce costs, circuit board manufacturers will have basic standard board sizes. These standards repeatedly consider the optimal utilization rate of circuit board boards. Common standards include 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. Selecting the most appropriate standard board and realizing 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 the number of layers and holes of the board, and whether there are blind holes.

The influence of SMT patch processing efficiency on the number of panels SMT processing line can be divided into long line and short line according to different use requirements. The short line has at most two fast mounters and one slow mounter; Long lines usually have multiple fast and slow mounters. Generally, each line is equipped with a solder paste printer. It takes about 35-40 seconds to brush solder paste once for a 150 mm long board assembly. The two in one board is processed in the SMT short line. The time allocated by each machine is about 10-26 seconds. The placement time is far less than the solder paste printing time, which indicates that the placement machine is waiting for the solder paste printer and has not fully utilized the production capacity of the placement machine. Replace two in one with four in one, and the efficiency will be improved immediately (output per hour), See the following table for specific data: 2 in 1 board solder paste printing (seconds) Fast machine 1 (seconds) Fast machine 2 (seconds) Slow machine 2 (seconds) Bottleneck time (seconds) Output per hour Top3826261038188 sheets Bottom4034352440180 sheets 4 in 1 board solder paste printing (seconds) Fast machine 1 (seconds) Fast machine 2 (seconds) Slow machine 2 (seconds) Bottleneck time (seconds) Output per hour Top3852522052276 sheets Bottom4068704870204 sheets Note: Output per hour={[60 (seconds/minute) x 60 (minutes/hour)] /Bottleneck time (seconds)} x number of panels. To sum up, PCB manufacturers usually hope that the fewer the number of boards, the better, because the fewer the number of boards, the less the probability of producing X boards, which can reduce the scrap rate and reduce the cost of board making. SMT factories also don't like to play X board, because it will reduce the processing efficiency. Therefore, it is still necessary to calculate the most affordable panel quantity from the perspective of overall PCBA processing cost. The process capacity of PCB plants and SMT plants also has an impact on this. In addition, consider whether V-cut or Router process is used to remove the board edge, which will also affect the panel design.