Surface Inspection of Shock Absorber Piston Rods

Polished surfaces of shock absorber piston rods are subjected to fully automated inspections, capable of detecting tiny defects located on the surface. The intention is to avoid any mechanical damages of the seals and resulting leakages.

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  • robust frame made of metal profiles
  • transfer unit (polyurethane-coated drive rollers and roller prism) with embedded eddy current probes
  • integrated PLC with operating panel
  • customized mechanics and sensors
  • fast transfer (up to 9 m/min / 0.5 ft/s), cycle time approx. 2-3 s (depending on transfer speed and test part length)
  • detection of tiny defects (cracks, pores, dents, overlaps)
  • use of differential probes (effective coil width ~ 5 mm / 0.2″ , high penetrating capability)
  • high sensitivity due to small sensor distance
  • adjustable to different test part dimensions: outer diameter 11 … 22 mm (0.43″ … 0.86″) / length 100 … 600 mm (4″ … 24″)
  • adjustable transfer speed
  • sensors available in different sizes
  • up to 500 parameter sets usable
  • digital I/O-interface to PLC
  • PLC coupled to master controller
  • optical sensors for position check
  • displaying and comfortable operation via touch panel
  • controllable demagnetising unit

System Data

  • 2-channel eddy current instrument IS500
  • 4 differential probes with customized housing
  • 7“ Colour TFT Touch Panel
  • 2 configurations: in-line system (fully integrated) or stand-alone system (Co. NDECT)

Products in use

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Dillinger manufactures technologically outstanding and versatile heavy plates at the traditional Saar location. References in a wide variety of application areas are available worldwide. Especially for pipeline applications, the HST test procedure developed by ROHMANN supports the precision and consistently high quality of Dillinger products. Dillinger Hütte

Eisenwerk Brühl GmbH specializes in the development and mass production of cast iron engine blocks for the automotive industry. The company is one of the most important suppliers of cast iron ZKG for the passenger car sector. To secure the production process, i.e. for the detection of material defects, hand and line testing devices from ROHMANN are used. Eisenwerk Brühl GmbH

As a subsidiary of the Etihad Aviation Group, the company offers services in the areas of line, light and heavy maintenance. The largest service provider for commercial aircraft in the field of maintenance, repair and operation in the Middle East, uses both the ELOTEST M2 handheld tester and the ELOWHEEL 1000 rim tester (RPT16) for inspecting their aircrafts. Etihad Airways Engineering

Stüken is the world market leader for deep-drawn components, punch and deflection parts of maximum precision and reliably high quality. For automated quality assurance, i.e. for the detection of material and structure defects, Stüken uses line testing equipment, e.g. the ELOTEST PL600 from ROHMANN. Hubert Stüken GmbH & Co. KG

Lufthansa Technik offers a complete service for aircraft technical services, such as maintenance, overhaul and testing of engines and chassis. In addition to the robot-based ELOSCAN test systems, Lufthansa Technik AG also uses sensors and portable test equipment from ROHMANN at several locations in Germany. Lufthansa Technik AG

NKT is a well-established and global supplier of turnkey DC and AC cable systems, providing world-class energy transport with innovative cable solutions. To ensure the quality of its own products, NKT uses the line tester ELOTEST IS500 from ROHMANN. NKT Group GmbH

Siemens Power Generation Services provides worldwide service solutions for gas or steam turbines, generators or wind turbines to increase the efficiency, reliability and operational flexibility of plants. In its global maintenance services, the company uses a.o. the ROHMANN handheld tester ELOTEST M3. Siemens

As a traditional aviation manufacturing and maintenance company, Zeppelin offers professional QM services to the global aviation industry, the automotive industry and mechanical and plant engineering. For the aerospace sector, Zeppelin carries out ZFP training courses using ROHMANN handheld testers Elotest M3, test probes and calibration standards. Zeppelin Systems GmbH

ZF is a leading global technology group in driveline and chassis technology as well as active and passive safety technology. ZF uses a wide range of innovative solutions from ROHMANN for various testing tasks in the field of crack and structural testing. ZF Friedrichshafen AG