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Do these machines solder the component? Or is it then necessary to put the PCBs in the oven? thnks!
by jmrobles 9y ago
Do these machines solder the component? Or is it then necessary to put the PCBs in the oven? thnks!
- BillinghamJ 9y agoNo - they are extremely fast, way faster than they could be if they were soldering. You put the PCB in a reflow oven afterwards.
- rkangel 9y agoThe process for industrial assembly is: Put solder on the pads. This can be done with a solder mask - a thin sheet of metal with holes cut where the pads are. Solder paste is scraped over it and then the mask is lifted off, leaving solder on the pads. Place components. This can be done manually or with the pick and place machines described here. The solder paste is sticky so there is something to hold the components in place once placed. Reflow. This is done by putting the now populated board into a special oven. This oven will put the board through a particular temperature curve ('profile') which melts the solder then lets it cool. The surface tension of the solder on the pads helps here - it pulls components that are a fraction off into perfect position (assuming the pick and place got it close enough and that solder is on pads where it is meant to be).
- stephen_g 9y agoJust a note - the solder mask is actually part of the PCB, in the past often green but now all sorts of colours. It covers up the tracks and copper fills etc. that you don’t want solder on. What you’re referring to in the first paragraph is just called a stencil.