How is the integrated circuit board made?

1, printed circuit board. Print out the printed circuit board with transfer paper, and pay attention to the slippery side. Generally, two circuit boards are printed, that is, two circuit boards are printed on a piece of paper. Choose the best printed circuit board. 2. The diagram of the whole process of making circuit board with the photosensitive plate cut by copper clad laminate. Copper clad laminate, that is, the circuit board with copper films on both sides, is cut to the size of the circuit board, not too big, in order to save materials. 3. Pretreatment of copper clad laminate. Use fine sandpaper to polish off the oxide layer on the surface of the copper clad laminate to ensure that the carbon powder on the thermal transfer paper can be firmly printed on the copper clad laminate when the circuit board is transferred. The standard of polishing is that the surface is bright and there is no obvious stain. 4. Transfer the printed circuit board. Cut the printed circuit board into appropriate sizes, stick the printed circuit board on the copper clad laminate, align and put the copper clad laminate into the heat transfer machine, and ensure that there is no dislocation of the transfer paper when putting it in. Generally speaking, after 2-3 times of transfer printing, the circuit board can be firmly transferred to the copper clad laminate. The heat transfer machine has been preheated in advance, and the temperature is set at 160-200 degrees Celsius. Due to the high temperature, pay attention to safety when operating! 5, corrosion circuit board reflow oven. First, check whether the circuit board is completely transferred. If there are a few places where the transfer is not good, you can make it up with a black ink pen. Then it can corrode. When the exposed copper film on the circuit board is completely corroded, take the circuit board out of the etching solution and clean it, so that a circuit board is corroded. The corrosive solution consists of concentrated hydrochloric acid, concentrated hydrogen peroxide and water in the ratio of 1: 2: 3. When preparing corrosive liquid, drain water first, and then add concentrated hydrochloric acid and concentrated hydrogen peroxide. If concentrated hydrochloric acid, concentrated hydrogen peroxide or corrosive liquid accidentally splashes on skin or clothes during operation, it should be cleaned with clear water in time. Due to the use of highly corrosive solutions, attention must be paid to safety during operation! 6, circuit board drilling. Electronic components are all inserted on the circuit board, so it is necessary to drill holes on the circuit board. Choose different drilling needles according to the thickness of the pins of electronic components. When drilling with a drilling rig, the circuit board must be firmly pressed, and the speed of the drilling rig should not be too slow. Operating the drilling rig is relatively simple, and it can be done well as long as you are careful. Please watch the operation carefully. 7, circuit board pretreatment. After drilling, polish off the toner coated on the circuit board with fine sandpaper, and clean the circuit board with clean water. When the water is dry, apply a thin layer of rosin on the side with the circuit, which can not only prevent the circuit from being oxidized, but also make rosin a good flux. Generally speaking, the rosin water on the surface of the circuit board will solidify within 24 hours. In order to speed up the solidification of rosin, we use a hot fan to heat the circuit board, and it only takes 2-3 minutes for rosin to solidify. The temperature of the hot air blower is as high as 300 degrees. When using, you should not point the air outlet at flammable materials, people and small animals, but you should put safety first! 8. Welding electronic components. After the electronic components are welded on the board, they are electrified to realize the function and manufacture.