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March, 2014 Continued from previous page


this purpose, a topside heating unit can be included in the soldering area of a modular SelectLine selective sol- dering system. As with the other mod- ular heating units, this additional heating unit can be monitored and controlled by means of the computer software, with a contactless pyrometer installed for precise control of the pre- heat temperature profile. The SelectLine selective solder-


ing systems feature extremely flexible and precise modular soldering areas. The electromagnetic (EM) soldering units employed in these systems pro- vide extremely stable and accurate wave height, combined with precise solder nozzles that effectively control solder flow for the amount of energy consumed. These systems incorporate Twin-Select dual solder pots for selec- tive soldering flexibility. With this concept, two EM soldering units are installed on separate Z axes and can be programmed and controlled inde- pendently. This eliminates change - over times and allows the use of two completely different solder alloys in the production of a PCB assembly. In addition, if these soldering units are equipped with soldering nozzles with different diameters, this Twin-Select dual-solder-pot concept can signifi- cantly reduce cycle times. For exam- ple, connectors on a PCB assembly can be soldered in one pass using a larger solder nozzle while finer struc- tures on the same assembly are sol- dered by means of a smaller-diameter solder nozzle, in contrast to changing


www.us-tech.com Selective Soldering With Added Flexibility


need for significant investment. The same soldering program is loaded for both soldering units synchronously, working in an infinite loop. The assemblies can enter the soldering area independently and are not linked to the same cycle. With the new Synchro concept, cycle times can be reduced by nearly 50 percent. Soiled solder nozzles can great-


ly impact the repeatability of any selective soldering system. In the SelectLine systems, the negative effects of soiled or clogged solder noz- zles are avoided by means of auto- matic ultrasonic cleaning of the wet- ted miniwave solder nozzles. What had been done previously through the manual application of aggressive cleaning chemicals is automatically achieved in the SelectLine selective soldering systems in an environmen- tally friendly way by means of auto-


mated ultrasonic cleaning through the machine. As part of this process, solder nozzles receive a gentle clean- ing and then are completely rewet-


approach also results in longer solder nozzle operating lifetimes. Reducing production costs while


The Twin-Select concept is based on the use of independently controlled EM solder units installed on separate Z axes.


ted. In addition to saving time and contributing to high soldering pro - cess repeatability, this cleaning


maintaining high quality is critical for any electronic production process. Because manually controlled repair soldering processes can be expensive and time-consuming, while also pro- viding inconsistent soldering results, many production facilities look to automated selective soldering sys- tems as an important step towards achieving a zero-fault production process. By integration of the required hardware and software as in the SelectLine selective soldering systems, a high degree of process control is possible. Precise position- ing of the soldering modules for each PCB assembly is an important part of achieving repeatable and repro- ducible soldering results, and in the


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Page 87


“The Full Spectrum of AOI Solutions”


Solder nozzles on


SelectLine sol der ing sys- tems are kept clean and clear through the use of automatic ultrasonic cleaning.


over solder nozzles for different pass- es on the different-sized structures to be soldered.


Innovative Solutions For demanding throughput re -


quire ments, the SelectLine selective soldering systems employ the Synchro concept (patented by SEHO) which essentially allows synchronous pro- duction of two PCB assembly lines using one selective soldering system. The modular design of these systems allows them to be equipped with addi- tional soldering modules or with a dual conveyor belt for parallel pro- cessing of PCB assemblies. The Synchro concept is an intelligent soft- ware feature that coordinates the sol- dering process for two PCB assem- blies in such a way that total through- put is nearly doubled without the


BOOTH #901 OOTH #901


5940 Darwin Court, Carlsbad, CA 92008


+1 (760) 438-1138


sales@visionpro.com See at APEX, Booth 901


www.machinevisionproducts.com


SMT


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