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German spring manufacturer Technische Federn Otto Joos is using a sorting system based on the Kistler Maxymos BL force displacement monitor to make sure each spring has the correct length to ensure a defined restoring force.

Springs manufactured by Technische Federn Otto Joos 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.

The Maxymos BL from Kistler Instruments 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.

Key benefits of product application

  • 100 per cent testing enables Otto Joos to guarantee that every spring delivered conforms to the customer’s specification without increasing production costs.
  • The Maxymos BL also monitors a grinding process that ensures optimal bearing surface and exact spring length; it achieves this based on the force threshold of approximately 0.5N. The monitor outputs the spring length at this point via its table of process values.
  • The force of 0.5N defines the initial contact between the force sensor and the spring; the associated increase in force at this position precisely indicates the length of the spring under test.

Kistler Instruments

Established in Winterthur (Switzerland) in 1957, the Kistler Group now has a worldwide presence with 23 group companies and 30 distributors ensuring prompt, local application support and short delivery times. With a staff of more than 1,000, the Kistler Group is one of the world’s leading providers of dynamic measuring instrumentation.

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 analyzing physical processes, controlling and optimizing 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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