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www.us-tech.com
March, 2018
Solving Wave Solder Issues with In-Process AOI and Rework
By Simon Smith, Marketing Manager, Pillarhouse International, Ltd. T
he industry has been pushing to remove wave soldering from the through-hole assem- bly process for a number of years. This is not
always possible, due to the speed and volume requirements of the production line. Common wave-associated soldering problems, such as bridg- ing between pins, skipped joints, etc., inevitably require a heavy reliance on rework. Since the speed of a wave solder system
is quicker than alternative processes, it is still considered a viable process in today’s production lines. Traditionally, wave solder issues are detected farther down a produc- tion line after a number of, if not all, assem- bly processes have been completed. Defective parts are then scrapped or must be reworked by hand.
Wave Solder Inspection In partnership with Landrex AOI,
Pillar house engineers developed a solution to inspect products after wave soldering, before continuing down the production line. Products are inspected after the wave process to identify any issues with through-hole solder joints, and in some instances, SMT components. When a fault is detected, the AOI system gen-
erates a unique report for each assembly. This report is then relayed from AOI to the Pillarhouse selective soldering system for rework. By using an XML file for the fault report, the system is plat- form-independent, allowing other vendors’ systems to be integrated. The Landrex Optima III SSI selective solder-
ing AOI system is specifically designed with built- in communication protocols for integrating the
Visit us at Booth 3015
The Cut Tape Solution for Printed Circuit Board Assembly
The Feeder Finger™ adapts the original manufacturer’s feeder to handle cut tape as short as three inches, feeder setup and
changeover time is reduced by 50%, and feeder performance is elevated by eliminating cover tape feeder jams during production. The feeder is not limited to tape strips — full reels can also be loaded keeping all feeders available for production.
In-line wave solder inspection with parallel selective rework.
effectiveness of the re-soldering process by auto- matically relaying information about defects and location to the selective soldering machines. The system serves as the final inspection process capa- ble of sending all inspection data to the host, thus making true automated manufacturing possible throughout the soldering and re-soldering process- es. The Optima III SSI incorporates extremely high inspection speed using innovative vision algo- rithms that identify PCB, insertion and solder variation defects. Pillarhouse is dedicated to the ongoing devel- opment of pioneering selective soldering technolo-
selective soldering process machines. Employing Landrex’s state-of-the-art AOI technology, the Optima III SSI provides excellent inspection per- formance while saving production time, as well as the cost of locating defects and problems in the sol- dering process. Through automation and communications, the Optima III SSI is capable of increasing the
gies to reflect and match the needs of an ever- changing marketplace. Combining the company’s Jade and Orissa selective soldering systems with AOI creates a cost-effective solution for the modern production line. The selective soldering system can be fitted with either a standard AP nozzle or a 0.06 in. (1.5 mm) micro nozzle, providing a very flexible soldering solution.
Parallel Rework If there is a failure after inspection,
then a board-specific XML report file is sent to the Pillarhouse system, which creates a unique rework process program. This ensures that only the specific joint or joints are reworked, correcting the product effi- ciently.
When the board is loaded into the selec-
tive soldering system, the board’s barcode is read and the specific process program is
loaded and executed. After completion of rework, the XML file is updated to reflect that the rework has been done and the file is
archived. The wave solder system’s performance can be analyzed by retaining all of these XML report files. The Pillarhouse/Landrex approach is to have
a number of automated rework methods that can be implemented in a production environment. Over a number of boards, some customers wish to identify regular issues from the wave solder sys- tem and then use selective to always solder these areas, whether the board needs it or not. Others require a selective soldering system to be in-line with AOI where the AOI passes the information to
Continued on page 70
At APEX 2018, Feeder Finger will showcase its latest Patent Pending #14/279,035
Cut Tape Solutions for Juki, Panasonic, & ASM feeders. If you cannot attend the show, learn more about our many Cut
www.feederfinger.com See at APEX, Booth 3015
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