What is the SMT process flow? What does it include?

2019-01-08 17:39:48 Ramon 245

SMT basic process elements include: screen printing (or dispensing), mounting (curing), reflow welding, cleaning, testing, repairing.

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1. Screen printing: Its function is to leak solder paste or patch film onto the PCB pad to prepare for the welding of components. The equipment used is screen printer, which is located at the front end of SMT production line.

2. Dispensing: It drips glue onto the fixed position of PCB. Its main function is to fix components on PCB board. The equipment used is dispensing machine, which is located at the front end of SMT production line or behind the testing equipment.

3. Mounting: Its function is to accurately install surface assembly components to the fixed position of PCB. The equipment used is the SMT mounter, which is located behind the screen printer in the SMT production line.

4. Curing: Its function is to melt the patch film, so that the surface assembly components and PCB board are firmly bonded together. The equipment used is curing furnace, which is located behind SMT Mounter in SMT production line.

5. Reflow soldering: Its function is to melt solder paste, so that surface assembly components and PCB board firmly bonded together. The equipment used is reflow soldering furnace, which is located behind SMT Mounter in SMT production line.

6. Cleaning: Its function is to remove harmful welding residues such as flux from assembled PCB board. The equipment used is a cleaning machine, the position can not be fixed online or not online.

7. Inspection: Its function is to inspect the welding quality and assembly quality of the assembled PCB board. The equipment used includes magnifying glass, microscope, on-line tester (ICT), flying needle tester, automatic optical inspection (AOI), X-RAY testing system and functional tester. Location can be configured in the right place in the production line according to the needs of detection.

8. Repair: Its function is to rework PCB board to detect faults. The tools used are soldering iron, repairing workstation, etc. Configuration at any location in the production line.



TAG:   SMT SMT process