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By ginkgo | 26 July 2022 | 0 Comments

SMT basic process flow

The basic process components of SMT include: screen printing (or dispensing), placement (curing), reflow soldering, cleaning, testing, rework
1. Silk screen printing: Its function is to leak solder paste or patch glue to the pads of the PCB to prepare for the welding of components. The equipment used is a screen printing machine (screen printing machine), which is located at the forefront of the SMT production line.
soder paste print
2. Dispensing: it drips glue onto the fixed position of the PCB board, and its main function is to fix the components to the PCB board. The equipment used is a glue dispenser, which is located at the front end of the SMT production line or behind the inspection equipment.
3. Mounting: Its function is to accurately install the surface-mounted components on the fixed position of the PCB. The equipment used is a placement machine, which is located behind the screen printing machine in the SMT production line.
SMT pick and place machine
4. Curing: Its function is to melt the patch glue, so that the surface mount components and the PCB board are firmly bonded together. The equipment used is a curing oven, which is located behind the placement machine in the SMT production line.
5. Reflow soldering: its function is to melt the solder paste, so that the surface mount components and the PCB board are firmly bonded together. The equipment used is a reflow oven, located behind the placement machine in the SMT production line.
puhui reflow oven t980
6. Cleaning: Its function is to remove the welding residues such as flux that are harmful to the human body on the assembled PCB board. The equipment used is a washing machine, the location may not be fixed, it may be online or not.
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, in-line tester (ICT), flying probe tester, automatic optical inspection (AOI), X-RAY inspection system, functional tester, etc. The location can be configured in a suitable place on the production line according to the needs of the inspection.
8. Rework: Its function is to rework the PCB board that has detected the failure. The tools used are soldering iron, rework station, etc. Configured anywhere in the production line.
rework station

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