The circuit board is constantly changing with the progress of the process technology, but in principle, a complete PCB board needs to print the circuit board, then cut the circuit board, process the copper clad laminate, transfer the circuit board, corrode, Drilling, pretreatment, and welding can only be energized after these production processes. The editor of Intellectual Circuits below will learn about the production process of PCB circuit boards with everyone.
Print circuit board: Print out the drawn circuit board with transfer paper, pay attention to the slippery side facing yourself, generally print two circuit boards, that is, print two circuit boards on one piece of paper. Among them, choose the one with the best printing effect to make the circuit board.
Cut the copper clad laminate, and use the photosensitive plate to make the whole process diagram of the circuit board. Copper-clad laminates, that is, circuit boards covered with copper film on both sides, should not be cut too large to save materials.
Pretreatment of copper clad laminates: use fine sandpaper to polish off the oxide layer on the surface of copper clad laminates to ensure that the toner on the thermal transfer paper can be firmly printed on the copper clad laminates when transferring the circuit board; the polished standard is the board Shiny finish with no visible stains.
Transfer printed circuit board: cut the printed circuit board into a suitable size, paste the printed circuit board side on the copper clad board and align it, then put the copper clad board into the heat transfer machine and make sure that the transfer paper is not misplaced. . Generally speaking, after 2-3 transfers, the circuit board can be firmly transferred to the copper clad laminate. The thermal transfer machine has been preheated in advance and the temperature is set at 160-200 degrees Celsius. Due to the high temperature, please pay attention to safety when operating!
Corrosion circuit board. Reflow soldering machine: first check whether the transfer of the circuit board is complete. If there are a few places that have not been transferred, you can use a black oil-based pen to repair it. Then it can be corroded, and when the copper film exposed on the circuit board is completely corroded, the circuit board is taken out from the corrosion solution and cleaned, so that a circuit board is corroded. The composition of the corrosive solution is concentrated hydrochloric acid, concentrated peroxide, and water in a ratio of 1:2:3. When preparing the corrosive solution, add water first, then add concentrated hydrochloric acid and concentrated peroxide. If concentrated hydrochloric acid, concentrated peroxide or corrosive solution is accidentally splashed during operation When it gets on the skin or clothes, it should be washed with clean water in time. Since a strong corrosive solution is used, be sure to pay attention to safety when operating!
Circuit board drilling: The circuit board is to insert electronic components, so it is necessary to drill the circuit board. Choose different drill pins according to the thickness of the pins of electronic components. When using a drill to drill holes, the circuit board must be pressed firmly. The speed of the drill should not be too slow. Please watch the operator carefully.
After drilling the circuit board pretreatment, use fine sandpaper to polish off the toner covering the PCB board, and clean the circuit board with clean water. After the water is dry, apply rosin water to the side with the circuit. In order to speed up the solidification of the rosin, we use a hot air blower to heat the circuit board, and the rosin can solidify in only 2-3 minutes.
Soldering electronic components: After soldering the electronic components on the board, power on.
The manufacturing process of the circuit board has been introduced above. At present, the traditional single-layer, double-layer, and multi-layer high-precision circuit board manufacturing process is similar.
