PCB panelization skills

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PCB panelization skills [Copy link]

Panelization refers to having the manufacturer directly assemble small PCB boards into a whole piece.

1. Why do we need to plywood? In other words, what are the benefits of plywood?

1. In order to meet the needs of production. Some PCB boards are too small to meet the requirements of making fixtures, so they need to be put together for production.

2. Improve the soldering efficiency of SMT patches. Only one SMT pass is needed to complete the soldering of multiple PCBs.

3. Improve cost utilization. Some PCB boards are special-shaped, and panelization can make more efficient use of the PCB area, reduce waste, and improve cost utilization.

2. What are the methods of puzzle design?

1.V-CUT

V-CUT is to draw a groove at the connection of two boards. Just put the two boards together and leave a gap between them (usually 0.4mm). However, the connection between the boards in this place is relatively thin and easy to break. The edges of the two boards need to be merged together when putting the boards together.

V-CUT is generally a straight line, without complicated lines such as curved arcs, etc. Try to keep it in a straight line when assembling panels.

2. Stamp holes

For irregular PCB boards, such as round ones, V-CUT cannot be done. At this time, stamp holes are needed to connect the panels. Therefore, stamp holes are generally used more in special-shaped boards.

The edges of the two boards are connected by a small piece of board, and there are many small holes at the connection between this small piece of board and the two boards, so it is easy to break. After breaking, the edge of the board is like the edge of a stamp, so this kind of boarding is called stamp hole.

3.Hollow connecting strip

Hollow connecting strips are more commonly used in boards with half-hole technology. They use very narrow plates for connection, which is somewhat similar to stamp holes. The difference is that the connecting part of the connecting strip is narrower and there are no vias on both sides.

The hollow connector has a disadvantage: when the board is split apart, there will be a very obvious bump. The stamp hole also has a bump, but it is not very obvious because it is separated by the via.

Some people may think that it is better to use stamp holes directly, why use hollow connecting strips? This is because when making a module with half holes on all sides, stamp holes and V-CUT cannot be used, and only hollow connecting strips can be used to connect the four corners of the module.

3. What are the principles of paneling?

For the convenience of production, try to keep the board in a square shape after assembly. In short, do not let the length and width ratio differ too much.

4. Spacing requirements:

1. For PCBs where the outermost side of components is less than 3mm from the edge of the board, a process edge must be added, usually with the longer side as the process edge;

2. A space of >0.5mm should be reserved between components and V-CUT to ensure normal operation of the tool.

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hqli126

, try to keep the board in a square shape after splicing. In short, don't let the length and width ratio differ too much.