What does SMT patch mean
SMT patches are area assembly strategies, generally known as surface mount or surface mount strategies. It is a leadless or small lead floor assembly elements (SMC/SMD in Chinese, flake components) set up to the surface of printed circuit board or other substrate surface, through reflow welding or dip welding and various solutions to welding assembly circuit assembly engineering.
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The basic technological approach of SMT patch is: solder paste printing -> elements mounting -> reflow welding ->AOI optical detection -> routine maintenance -> subboard.
one. Solder paste printing: It is actually accustomed to leak solder paste or PATCH adhesive on to PCB's solder pad to organize for your welding of factors. The devices employed is screen printing device (display screen printing machine), found at the entrance close of SMT output line;
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two. Glue spraying: It drops glue into the fixed posture of PCB board, and its key function is usually to fix components to your PCB board. The tools utilised is the dispensing machine, located with the front stop of SMT output line or guiding the screening equipment;
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3. Surface mount: Its functionality is usually to correctly put in surface assembly elements on the set place with the PCB. The equipment applied is SMT placement device, located driving the display screen printing machine in the SMT production line;
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four. Curing: Its function would be to melt the SMT adhesive so that floor assembly components and PCB board could be firmly adhered together. The tools applied is curing furnace, located driving SMT SMT manufacturing line;
5. Reflow welding: the function of reflow welding would be to soften the solder paste, making sure that surface assembly factors and PCB board firmly stick collectively. The products utilised is reflow welding furnace, found from the SMT production line guiding the position equipment;
six. Cleansing: The functionality is always to get rid of the welding residue for example flux on the assembled PCB that is destructive to human system. The devices applied may be the cleaning device, the place can not be mounted, is often on the web, or not on-line;
seven. Detection: It's accustomed to detect the welding top quality and assembly high-quality from the assembled PCB. The tools utilised consists of magnifying glass, microscope, on-line testing instrument (ICT), traveling needle screening instrument, computerized optical screening (AOI), X-ray tests process, useful tests instrument, and so on. The location may be configured during the acceptable position from the manufacturing line based on the detection desires;
eight. Repair: it is actually accustomed to rework the PCB which has been detected with faults. The applications utilized are soldering irons, repair service workstations, etc. The configuration is any where while in the production line.
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