In the electronic manufacturing industry, PCB (printed circuit board) is an indispensable component that carries various electronic components and connects them to achieve circuit functions. This article will briefly introduce the production process and key points of PCB processing circuit boards, helping readers understand the technology and techniques behind it.
1、 Design phase
1. Schematic design: Firstly, engineers use professional circuit design software to draw circuit schematics and clarify the connection relationships between various components.
2. PCB layout: Based on the schematic, the designer arranges the components in the PCB design software to ensure efficient signal transmission and reasonable layout.
3. PCB wiring: After the layout is completed, the wiring design is carried out to ensure that the connection paths between all components are short, while meeting the requirements of electrical performance and mechanical strength.
2、 Material preparation
1. Substrate selection: Select suitable substrate materials based on the performance requirements of the circuit board, such as FR4, CEM-1, aluminum substrate, etc.
2. Copper clad laminate treatment: Surface treatment is carried out on the selected copper clad laminate, such as degreasing, oxidation removal, etc., to ensure smooth subsequent processing.
3、 Production process
1. Plate making: Convert the designed PCB graphics into actual processable graphics, usually using photosensitive plates or laser direct imaging technology.
2. Board cutting: Cut large copper-clad laminates into appropriately sized pieces according to the requirements.
3. Drilling: Use a drilling rig to drill holes based on the pin size and position of the components.
4. Chemical etching: Immerse the copper-clad laminate after plate making into an etching solution, remove the unprotected copper layer through chemical reaction, and form a circuit pattern.
5. Film stripping: Remove the resist for subsequent processing.
6. Surface treatment: As needed, perform surface treatment on the circuit board, such as gold plating, tin spraying, etc.
7. Shape cutting: Cut the circuit board into the final shape according to the design requirements.
4、 Quality inspection
1. Appearance inspection: Check the surface of the circuit board for defects such as scratches, short circuits, and open circuits.
2. Electrical performance testing: Use professional testing equipment to conduct electrical performance testing on the circuit board to ensure that all performance indicators meet the design requirements.
5、 Post processing
1. Solder mask treatment: Apply solder mask treatment to areas that do not require welding to prevent short circuits during welding.
2. Character printing: Printing the identification, parameters, and other information of components on the circuit board.
3. Surface treatment: Perform final surface treatment such as cleaning, drying, etc.
6、 Packaging and Shipping
1. Classification and packaging: Classify and package circuit boards according to customer needs.
2. Shipment inspection: Conduct the final quality inspection before shipment to ensure product quality.
3. Shipment and delivery: Deliver qualified circuit boards to customers according to their requirements.
The production of PCB processing circuit boards involves multiple stages and steps, each of which requires strict quality control and technical support. Through the introduction in this article, we hope to provide readers with a deeper understanding of the production of PCB processing circuit boards.