MB (Marybeth) Allen, General Manager of KIC Europe in an interview with Globalsmt.net makes a terrific case for RPI (Reflow Process Inspection).
Here are some excerpts:
Q. 2009 saw the introduction of your RPI In-Line Process Inspection System for SMT reflow ovens. For manufacturers currently relying on AOI and X-Ray systems to carry out inspection functions, can you explain how this system works and why RPI should be the choice for this process?
Automated inspection systems have become critical in controlling quality throughout the manufacturing process. SPI (solder paste inspection) and AOI (automated optical inspection) are excellent defect detection tools, within the limitations of their design. The RPI (reflow process inspection) inspects the reflow process for each and every manufactured PCB.
The quality of a solder joint is not only a function of whether there was adequate solder, accuracy of placement, missing components etc., but that the solder was processed correctly. For example, the peak temperature needs to be high enough, but not too high to damage the component; the time above liquidous must be within the required range etc. The AOI machine is not designed to check for these critical events.
KIC’s RPI verifies that the PCBs have been manufactured within the required thermal process window. Perhaps the best example of where RPI complements AOI is in the soldering of BGAs and other Area Array Packages, where the AOI machine cannot see the solder joints as they are hidden from view by the component body. RPI even complements X-Ray machines as these inspection systems cannot tell whether the solder joints were processed in accordance with the required profile specs.
Q. So KIC RPI offers both oven and product data in one solution, this obviously enables the operator to harness this key data and use the yield charts to refine the process. What type of data do they receive and how easy is this to understand?
RPI automatically generates both Yield and DPMO (Defects Per Million Opportunities) production charts. There’s really nothing for the customer to do as the information on all boards produced is captured automatically. You’ve seen these charts in many factories showing product data for many steps in the manufacturing process. However, previously data from the reflow process was missing. Only reflow oven machine data was available. KIC’s RPI now provides this missing key product process data, providing another key link to product quality.
Q. This product offers a timely solution for manufacturers in this tough climate and I understand it has already received awards for its innovation. What has been your feedback so far?
Yes, RPI has already received several awards around the world. People are looking for a solution to save money and ensure continued quality control. When I visit customers and prospective customers their initial questions or requests can be taken care of by using RPI. It’s wonderful to be able to say “Yes, RPI can help you with that” to most of their requests. We have plugged the hole in the inspection process.
For the full interview go to: http://www.globalsmt.net/content/view/7583/70/