Changsha PCBA production process

Today, Xiaobian takes you to learn about the manufacturing process of PCBA. Before we know about the manufacturing process of PCBA, we should first know about PCB, which is the printed circuit board, the foundation and carrier of electronic components and related electrical links. Generally, it is called PCB bare board, while PCBA is a technological process that uses PCB bare board as the carrier, and the PCB is welded by SMT /AI (Automatic Plug-in) and other technologies. Examples of PCB and PCBA are as follows:
PCB
PCBA
Obviously, PCBA is a process formed by combining SMT and AI technology on PCB, and strictly speaking, PCBA=PCB+ components +SMT/AI+ firmware+test. Let’s take a look at the general steps of PCBA production:
SMT (Surface Mount Technology) refers to surface mount technology, which is a process of mounting electronic components on the surface of pcb and soldering them by reflow soldering. SMT can be broken down into the following steps:
Solder paste printing: The thawed solder paste is placed on a steel net, and the tin is uniformly printed on the PCB by a scraper. Lead-free solder paste is commonly used, and the solder paste thickness and printing effect are usually detected with a solder paste detector.
Mounting the components on the feeder, the mounter head sucks the components with a suction nozzle, and places the components on the PCB pad according to the specified procedure.
The purpose of reflow soldering is to melt the solder paste by heating at high temperature, so that the components and PCB pads can be closely combined, and the components can be firmly soldered on the board. After reflow soldering, the soldering effect of PCB can be detected by AOI (Automatic Optical Inspection), and abnormal situations such as missing parts/displacement/erection/direction, and soldering can be detected.
Insert the components packaged by plug-in DIP in the corresponding position of PCB, and then wave solder the pins on the pad, cut off the redundant pins, and clean the traces of wave solder.
Firmware burning uses the programming device to burn the firmware into the IC through the burning port. This step can also be completed before the IC is mounted, and the firmware is burned into the IC in batches by the burning factory.
Generally, tests are divided into basic function tests, environmental tolerance tests, EMC tests, mechanical stress impact tests, and PCBA tests, which are very critical technological processes. Tests directly affect the quality of products, and different product requirements have different test processes and means.
Coating Three-proof paint Three-proof paint is a special kind of paint, which is sprayed on PCBA to achieve the purpose of moisture-proof, salt spray-proof, and corrosion-proof. It can protect against the harsh environment and prolong the service life of products. These are the process steps from PCB to PCBA.