What are the SMT process
Everyone knows that the electronic products we use in our lives are assembled on the PCB with various electronic components such as resistors and capacitors. These kinds of electronic components want to be firmly mounted on the PCB. It has to be done through SMT process. SMT patch refers to the series of process flow processing on the basis of pcb, which is the process that many pcb circuit board manufacturers will use. The following FASTPCBA technicians will introduce the process flow of SMT process for everyone:
1, Silk screen: its role is to print solder paste or patch glue on the PCB pad, Ready for the welding of components . The equipment used is a screen printing machine (screen printer), located at the forefront of the SMT production line.
2, Dispensing: The glue is dripped onto the fixed position of the PCB. Its main function is to fix the components to the PCB. The equipment used is gluedispenser located at the forefront of the SMT line or behind the inspection equipment.
3, Mounting: Its function is to accurately mount the surface-assembled components to the fixed position of the PCB. 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-assembled components and the PCB board are firmly bonded together. The equipment used is a curing oven located behind the mountingmachine in the SMT 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 is a reflow oven located behind the mountingmachine in the SMT line.
6, Cleaning:it is used to remove welding residues such as flux harmful to human body on the assembled PCB board.The equipment used iscleaning machine, location can not be fixed, can be online or offline
7, Inspection: The function is to test the quality and assembly quality of the assembled PCB. The equipment used includes a magnifying glass, a microscope, an on-line tester (ICT), a flying probe tester, an automatic optical inspection (AOI), an X-RAY inspection system, and a function tester. The position can be configured in a suitable place on the production line according to the needs of the inspection.
8, Repair: its role is to reworkthe failure of the PCB board detected. The tools used are soldering irons, rework stations Configure anywhere in the production line.
The above content is about the process flow of SMT process, I believe everyone get the point. SMT process has the advantages of high assembly density, small volume and light weight of electronic products, and is currently the most popular technology and process in the electronic assembly industry.
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