PCB Tech - PCB process edge width set circuit board automotive PCB

In the PCB production process of the circuit board factory, the reservation of the process edge is of great significance for the subsequent SMT chip processing. The process side is to assist in the production of the plug-in board, the part of the welding wave on the two or four sides of the PCB board. It is mainly used to assist the production. It is not part of the PCB board and can be removed after the production is completed.

Since the process side consumes more PCB plates and increases the overall cost of the PCB, it is necessary to balance economy and operability when designing the PCB process side. For some special-shaped PCB boards, the original PCB board with 2 process edges or 4 process edges can be greatly simplified through the method of splicing. When designing the splicing method in patch processing, it is necessary to fully consider the track width of the SMT placement machine. For splicing boards with a width of more than 350mm, it is necessary to communicate with the process engineer of the SMT supplier.

The main reason for leaving the process side is that the track of the SMT placement machine is used to clamp the PCB board and flow through the placement machine, so the components that are too close to the track side are sucked in the nozzle of the SMT placement machine and mounted to When the PCB board, the phenomenon of collision occurs, and the production cannot be completed, so a certain process edge must be reserved, such as 2~5mm and so on. The same applies to some plug-in components to prevent similar phenomena during wave soldering.

The flatness of the PCB process edge is also an important part of PCB production. When removing the PCB process edges, it is necessary to ensure that the process edges are flat, especially for PCB boards that require extremely high assembly accuracy. Any uneven burrs will cause the mounting holes to shift and cause great troubles for subsequent assembly.

The advantages of automotive circuit board PCB

PCB circuit board is one of the most important hardware of electronic equipment, and it is an important part of various electronic components. PCB circuit board is generally able to supply electricity to make it run by connecting equipment.

1. It can be high-density for more than 100 years, and the high-density of printed boards can develop with the improvement of integrated circuit integration and the advancement of installation technology;

2. High reliability, through a series of inspections, tests and aging tests, it can ensure that the PCB works reliably for a long time;

3. Designability. For various performance requirements of PCB, printed board design can be realized through design standardization, standardization, etc., with short time and high efficiency;

4. Manufacturability, adopting modern management, can carry out standardized, large-scale, automated production, and ensure product quality consistency;

5. Testability. A relatively complete test method, test standard, various test equipment and instruments have been established to detect and appraise the eligibility and service life of PCB products;

6. Assemblability. PCB products are not only convenient for standardized assembly of various components, but also for automated, large-scale mass production. At the same time, PCB and various component assembly parts can be assembled to form larger parts and systems, up to the complete machine;

7. Maintainability. Since PCB products and various component assembly parts are standardized and produced on a large scale, these parts are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored to work.