SMT process flow
Basic technology of SMT components: solder paste printing -- -- -- -- > > parts pasted on a -- -- > reflow soldering furnace curing > AOI optical detection -- -- > maintenance - > plate -- -- -- -- > > grinding plate washing plate.
1. Solder paste printing: its function is to leak wuxi paste onto the solder pad of PCB to prepare for the welding of components. The equipment used is silk screen printing machine, which is located at the front end of SMT production line.
2. Parts mounting: its function is to accurately install the surface assembly components to the fixed position of PCB. The equipment used is SMT SMT SMT production line behind the screen printing machine.
3. Furnace curing: its function is to melt the SMT adhesive, so that the surface assembly components and PCB board can be firmly bonded together. The equipment used is curing furnace, which is located behind SMT SMT production line mounter.
4. Reflow welding: its function is to melt the solder paste so that the surface assembly components and PCB board can be firmly bonded together. The equipment used is reflow furnace, which is located behind SMT SMT production line mounter.
5.AOI optical detection: its function is to detect the welding quality and assembly quality of the assembled PCB board. The equipment used is automatic optical detection (AOI), the order quantity is usually more than ten thousand, the small order quantity will pass the manual detection. The location can be configured to fit the production line according to testing requirements. Some before reflow welding, some after reflow welding.
6. Maintenance: its function is to repair the faulty PCB board detected. Tools used for soldering iron, repair workstation, etc. Configuration after AOI optical detection.
7. Dividing board: its function is to divide the multi-connecting board PCBA to form an individual. V-cut and machine cutting are generally adopted.
8. Grinding plate: its function is to scrub the parts with burrs to make them smooth and smooth.
9. Washing board: its function is to remove the harmful welding residue such as flux on the assembled PCB board. Manual cleaning and cleaning machine cleaning, the position can not be fixed, can be online, but also not online.