Comprehensive Application of AOI Technology in SMT Manufacturing

As an advanced quality assessment modern technology, AOI technology can adequately inspect elements,
welding, and mounting in SMT production.

AOI Main Applications

AOI is mainly made use of in solder paste printing inspection, part inspection, and after-welding
assembly examination.

1. Stencil Printing

AOI plays a significant function in the very first step of the SMT printing process. In this stage, the
AOI system can identify and confirm the solder paste’s accuracy, harmony, and position.

Via high-resolution photo purchase, AOI can properly identify excess or insufficient solder paste to
make sure appropriate distribution on the PCB.

2. Parts Positioning

In the positioning process, AOI is made use of to verify whether the SMT tools has properly positioned
all digital parts. It can discover the part’s position, orientation, and polarity to guarantee that
they satisfy the layout illustrations.

AOI can likewise recognize potential printed circuit board assembly mistakes, such as countered, slanted, or missing
components, to stop these troubles lead a lot more major quality problems in succeeding procedures.

3. Reflow Soldering

During the welding process, the AOI system inspects the quality and connectivity of solder joints. It
can detect whether the solder joints are too much or inadequate and whether there are issues, such as
chilly solder joints, short circuits, or open circuits.

Via real-time picture analysis, AOI can rapidly determine unqualified welds and quickly inform operators
to make PCB repair work to ensure the final welding quality.

4. Post-Solder Examination

AOI still plays a role in the post-welding assessment procedure. It can detect defects in solder joints,
the accuracy of parts, and feasible circuit card assembly issues.

With this step, the AOI system helps to inspect out prospective quality concerns, making certain that
the item meets the required quality criteria before going into the next circuit card manufacturing
stage.

5. Last Assessment

Ultimately, AOI is made use of for comprehensive final test during the terminal discovery phase of SMT.

It validates element layout, solder joint links, part accuracy, and alignment of the circuit card.

The terminal inspection is to ensure the entire PCB meets the design requirements before last shipment.
AOI achieves this objective through reliable automated examination.

Advantages and Difficulties of AOI

The vast application of AOI in numerous SMT procedures brings lots of benefits,
including:

Improve inspection performance: AOI can instantly and effectively discover defects,
saving hands-on inspection time.

Improve discovery precision: AOI can make use of image recognition modern technology
that can properly spot refined flaws.

Lower manufacturing expenses: AOI can lower the PCB remodel price and printed circuit
board manufacturing expenses.

Nonetheless, AOI additionally faces some obstacles, including:

High preliminary investment expense: Introducing an AOI system needs initial investment
and succeeding upkeep, which raises circuit card manufacturer expenses.

Can not completely change hand-operated inspection: Although automated optical
inspection systems can effectively discover many issues, but it still can not replace some aspects of
manual inspection, specifically when dealing with complex issues.

Taking into consideration these benefits, PCB makers can better use AOI modern technology to attain a
higher degree of SMT producing quality.