Production Machining

JUN 2018

Production Machining - Your access to the precision machining industrial buyer.

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Jomesa's Filter Analysis System The microscope's motorized polarization allows for the automatic detection of metallic particles, non-metallic particles and fibers. This image of a filter membrane with metallic reflections contains a polarization setting in the direction of transmission. The change of polarization is done automatically. This image is of the same filter membrane with a polarization setting to exclude metallic reflections. The change of polarization is done automatically. All particles, regardless of their nature, will be counted and their size evaluated. By comparing the two images, the software discriminates between particles of metallic nature and other particles. :: Lev Pekarsky, technical expert, contamination and filtration, Ford Motor Co., uses a cleanliness analysis system that gives a microscopic analysis of particles, automatically recognizing metallic pieces that can't be seen with the human eye. Contamination Lab in Livonia, Michigan, that is respon- sible for developing new, advanced contamination inspec- tion procedures and supporting special investigations. Ford specs include different stipulations for different types of transmissions. e small parts that make up the transmis- sions, such as valves, springs and gears, are also tested for particle contamination mostly by Ford suppliers prior to shipping. Very detailed specification documents not only contain inspection process descriptions, but also include requirements for inspection system cleanliness prior to testing. Requirements defining the maximum number of particles and corresponding particle sizes for different types of components being tested are also included in the Ford specifications. Transmission Plant Contamination Lab inspectors rely on the company's contamination specifications to do its job every day, Ford says, and following these standards saves money on warranties and rejected parts. Evolutionary Requirements Ford says its contamination specs, along with other OEMs, have evolved through the years and continue to be updated when new contamination inspection technology becomes available. e first specs written by Ford engineers many years ago were based on gravimetric methodology, or the weight of debris on a component. Gravimetric require- ments ensured that clean filters are weighed prior to debris collection and "dirty filters" after debris collection. e "after minus prior" filter weight difference had to adhere to specific requirements, Ford says. Most of the parts in the transmission were required to be tested. en, about 10 years ago, optical detection came into play. It became possible to use automated microscopes to capture and analyze digital images of debris collected from manufactured parts. "e software (that was packaged with the microscopes) became so sophisticated that it now can differentiate between filter background and individual debris, identify metallic and non-metallic materials and measure their sizes and calculate quantities," Mr. Pekarsky says. Around 2013, the Livonia lab began using cleanliness :: 37 SPECIAL COVERAGE

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