Fraunhofer IZFP offers its customers and research partners the entire range of nondestructive testing technologies, whether it involves basic or applied research. The institute's researchers, engineers and technicians develop solutions to address modern testing applications including feasibility studies, consulting, training and inspection services and creating prototype systems. From June 13 to 17, 2016, our researchers and engineers present the next generation of automated inspection systems for railway wheels at the World Conference on Non-Destructive Testing (WCNDT) in Munich.
Railway wheels are exposed to great dynamic stress. For this reason, they need to be subjected to non-destructive testing during the manufacturing process with the aim of detecting material flaws that may have been caused during manufacture.
In accordance with the current state of technology, the testing is carried out using automated inspection systems.
The challenge was to design a system which guarantees a sensitivity of FBH 1 mm, a dead zone of 5 mm beneath the test surfaces and a cycle time between 60 to 90 seconds.
This makes high demands on the ultrasonic inspection technology. To reduce the mechanical outlay, allow optimum coverage of the prescribed inspection areas and enable flexible configuration of the inspection technology with regard to the wide range of different wheel geometries, phased array probes are used for the inspection of the wheel rim and wheel hub, whilst squirter probes guided by robots are used for the inspection of the discs.
In order to be able to cover the prescribed inspection areas when the beam is being directed into the rim axially and radially and into the hub from both sides for all the wheel types occurring at the manufacturer's works, phased array probes designed specially for this inspection problem, with 64 and 128 elements (linear arrays), have been developed.
In the case of the hub in particular, the challenge consisted in finding a suitable configuration of the phased array probes, in order at the same time to cater to both the small dead zone and the large inspection area of up to 300 mm within a single test cycle.
It was also necessary to develop a suitable probe carrier which would make constant coupling possible through a water gap in spite of the large active aperture of the probes.
In wheel requalification, examination of the disc is also required. Here the challenge involves recording the geometry, which may be complex, and then carrying out the inspection.
Contoured wheel discs in particular make it more difficult to determine the contour data and carry out the ultrasonic inspection, and call for solutions that are sophisticated in terms of the inspection technology they use. This paper aims to provide an introduction to robot-aided contour recording and ultrasonic testing using squirter probes.
Sabine Poitevin-Burbes | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP
Let the good tubes roll
19.01.2018 | DOE/Pacific Northwest National Laboratory
Method uses DNA, nanoparticles and lithography to make optically active structures
19.01.2018 | Northwestern University
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy