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October, 2019 Plug-and-Produce: Selective Soldering Made Easy Continued from previous page
touch panel. The operator only needs to push a few buttons in order to load the program and start the process. While the operator loads and unloads the
assemblies manually, the entire processing work- flow in the system is fully automated — keeping things simple. For the individual process stations of the StartSelective, SEHO sticks with tried-and- tested technology. All process-relevant compo- nents, such as the micro drop jet fluxer, preheat system and soldering unit have been used success- fully for years in other SEHO soldering systems. “The StartSelective is the first machine
where we combined them in this form,” says Blum. “We involved our customers in the development process of the system and their focus was on the consistently high quality of the manufactured products and on lowering their production costs.” The preheat section of the StartSelective is
equipped with pulsar heaters over the entire sur- face, which are noted for their high energy density
It is always better to prevent defects than to correct them.
and extremely quick response times. The heaters can be activated in pairs with individual power out- put as needed, which ensures not only the optimal temperature management on the circuit board sur- face even if mass conditions vary, but also reduces the energy consumption of the system to a mini- mum. In addition, there is a top heater that supplies a continuous controlled heat input for constant process conditions even in long soldering cycles. A particular highlight is the soldering area
with a 7° soldering angle that is optimized for the use of non-wetted mini-wave nozzles. This results in ideal solder peel-off and the effective minimiza- tion of potential soldering defects. The solder nozzles stand out for their stable, reproducible flow behavior — a basic prerequisite
for good soldering quality. They allow minimal dis- tances between vias so that even complex assem- bly layouts can be soldered easily. “Non-wetted nozzles have more benefits, though, which is another thing that sets the StartSelective apart from other machine designs,” says Blum. “These nozzles are maintenance-free and have an almost unlimited service life, which means there are no follow-up costs. In addition, they do not require any aggressive chemicals to be added for activa- tion. This is a benefit both for the health of the pro- duction staff and for the environment, and of course it also saves production costs.” The soldering unit itself includes an electro-
magnetic drive to ensure consistent wave height. It requires minimal maintenance and is virtually free from wear.
Built-in Quality The fact that the quality of a finished
product matches the requirements is some- thing that end customers today simply take for granted. This alone does not guarantee sales. However, poor quality can do a lot of damage. The production of defective products has a negative impact on deliveries and costs. In the worst case, even the brand image can take a hit. For this reason, it is always better to prevent defects than to correct them. The StartSelective all-around, care-free
package also includes continuous monitoring and automatic control of all relevant process steps. The heating circuits in the system are continuously monitored, and a sensor system con- trols the heating output in the preheat area, as well as the soldering area. In the fluxing area, a spray jet monitor checks the proper functioning and positional accuracy of the system. The solder level in the crucible is continuous-
ly monitored and solder wire is supplied automati- cally as needed. A contact measurement of the sol- der wave surface automatically controls the wave height in order to ensure consistent process condi-
StartSelective selective soldering system. For one-piece flow, the StartSelective offers an
exceptional return on investment as well as quality and reproducibility of the soldering results and 100 percent flexibility from the very first piece. Contact: SEHO North America, Inc., 1445
Jamike Avenue, Suite 1, Erlanger, KY 41018 % 859-371-7346 fax: 859-282-6718 E-mail:
sehona@sehona.com Web:
www.seho.de/en/north-america r
See at productronica, Hall A4 Booth 578
tions. The nitrogen flow rate is also constantly measured and monitored. Due to its compact design, the machine takes
up only about 27 ft2 (2.5m2) allowing it to fit into any production island. It can also be placed in the corner of the production floor as a standalone system. “Another way in which the StartSelective is
different from other systems is that operation is done at the front, while all retooling or mainte- nance is done through a door on the right side of the machine. This means no more worries about the lack of space on the production floor, and yet the machine is able to process assembly formats up to 20 by 20 inches,” says Blum.
See at productronica, Hall A4 Booth 405
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