Kistler Instruments Ltd. - PRODUCT NEWS
Kistler maXYmos BL has made the 100 % quality assurance possible without increasing production costs
German spring manufacturer, Technische Federn GmbH Otto Joos, manufactures technical springs for several industries that demand both a high quality product and no out of specification items.
The springs are designed and manufactured to withstand highly dynamic forces in injection pumps for automobile and truck engines as well as drive assemblies for locomotives and ships where one billion load cycles without failure is demanded as spring failure can have severe consequences.
Since springs must have the correct length to ensure a defined restoring force, the length of every spring is measured prior to delivery using a new sorting system based on the Kistler force-displacement monitoring system, maXYmos BL. The maXYmos BL monitors and evaluates XY curves in which two measurands (force and displacement in this case) are required to exhibit a certain relationship with respect to one another. Using two switching thresholds and the UNI-BOX evaluation object, the maXYmos BL records the three possible states of the springs under test; spring too short, spring in tolerance and spring too long and reports the result to the sorting chute via a PLC. This 100 % testing enables Otto Joos to guarantee that every spring delivered conforms to the customer's specification.
In addition to 100% pre-delivery testing, the compression springs must undergo a grinding process to ensure optimal bearing surface and exact spring length. The maXYmos BL also monitors this process based on the force threshold of approximately 0.5 N, the monitor outputs the spring length at this point via its table of process values. The force of 0.5 N defines the initial contact between the force sensor and the spring: the associated increase in force at this position precisely indicating the length of the spring under test.
For Otto Joos, the maXYmos BL has made the 100 % quality assurance demanded by the automotive industry possible without increasing production costs.
Established in Winterthur (Switzerland) in 1957, the Kistler Group now has a worldwide presence with 25 group companies and 30 distributors ensuring prompt, local application support and short delivery times. With a staff of more than 1050, the Kistler Group is one of the world's leading providers of dynamic measuring instrumentation with a turnover of 210 million Swiss Francs (GBP 145M) in the 2010 financial year.
Kistler's core competence is the development, production and use of sensors for measuring pressure, force and acceleration. Kistler's know-how and electronic systems can be used to prepare measuring signals for use in analysing physical processes, controlling and optimising industrial processes, improving product quality in manufacturing and improving performance in sports and rehabilitation.
Kistler offers a comprehensive range of sensors and systems for engine development, automotive engineering, plastics and metal processing, installation technology and biomechanics.
Heavy investment in research and development, 15% of staff worldwide are engaged in research and development, has generated a number of innovations using piezoelectric, piezoresistive and capacitive techniques to provide solutions to numerous force, pressure and acceleration measuring problems. These innovations include the world's first commercial quartz sensor, two-wire constant current technology to integrate sensors with microelectronic circuitry, high-temperature pressure sensors for use up to 400 Deg C and three-component force measuring sensors.
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