SMT is a surface mount technology (surface mount technology) (abbreviation of Surface Mounted Technology) and is currently the most popular technology and process in the electronic assembly industry. Surface Mount Technology (SMT) is called surface mount or surface mount technology. It is a method of mounting a leadless or short lead surface mount component (SMC/SMD for short) on the surface of a Printed Circuit Board (PCB) or other substrate. Reflow soldering or dip soldering and other methods of solder assembly circuit assembly technology.
1, silk screen: Its role is to paste the solder paste or patch glue printed on the PCB pad, to prepare for the welding of components. The equipment used is a screen printer (screen printer) located at the forefront of the SMT production line.
2. Dispensing: It is the glue that drops to the fixed position of PCB board, its main function is to fix the component to PCB board. The equipment used is a dispenser, located at the front of the SMT production line or behind the inspection equipment.
3, Mounting: Its role is to accurately install the surface mount components to the PCB's fixed position. The equipment used is a placement machine located behind the screen printing machine in the SMT production line.
4. Curing: The function is to melt the patch glue so that the surface assembly components and the PCB board are firmly bonded together. The equipment used is a curing oven located behind the placement machine in the SMT production line.
5, reflow soldering: Its role is to melt the solder paste, so that the surface assembly components and PCB board firmly bonded together. The equipment used was a reflow oven located behind the placement machine in the SMT production line.
6. Cleaning: The function is to remove the welding residue that is harmful to the human body such as flux on the assembled PCB board. The equipment used is a cleaning machine. The location may not be fixed, and it may be online or offline.
7. Inspection: Its role is to test the quality and assembly quality of assembled PCB boards. The equipment used is a magnifying glass, a microscope, an on-line tester (ICT), a flying probe tester, an automatic optical inspection (AOI), an X-ray inspection system, a function tester, and the like. The location can be configured in the right place on the production line according to the need of detection.
8, Rework: Its role is to rework the faulty PCB board. The tools used are soldering iron, rework station, etc. Configured anywhere in the production line.