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MANUFACTURING TECHNOLOGY


categories. The type of locking mechanism and its fi tting position must also be described. Next, the DIN asks the test technician


to record the:


• Test frequency. • Clamp-length ratio. • Pre-stressing force. • Effective transverse displacement. • Lubrication used.


The following report specifi cation


could be challenging for many, as it asks how the test equipment has been constructed. This could be problematic for some manufacturers, researchers and test-houses that use non-standard test rigs, as it is likely to cast doubt on the validity of the test results. But if a Junker Test Bench from a test equipment


manufacturer has been used, then the specifi cation manual that comes with the equipment can be used to detail how it has been constructed.


Time series data reporting can now be automated Clearly, one of the most important parts


of the fi nal test report is the plot of the pre-stressing force against the number of load cycles. This is important because this data demonstrates the effectiveness of the fastener locking mechanism. There are now Junker Test Benches


available that can automate this element of the reporting process. The benches can even provide the data in a time series, together with a graph in real-time during testing and then output the results into standard fi le formats. That makes it


particularly easy to import the information into users’ and clients’ preferred analysis software. Equally important is the fi nal part of


the report. This should detail the exact conditions under which the fastener’s securing element can be used, and if the test determined this, the level of pre- stressing force at which the fastener can be expected to fail. Details such as lubrication, surface coatings and the range of diameters are also requested. The new reporting requirements of


DIN 25201 mean that some models of Junker Test Benches and many test rigs will simply be unable to provide the level of detail required, nor in a format that can be easily converted into a report format.


Conclusions There is no doubt that DIN 25201


represents a signifi cant advance for the fastener industry. It will ultimately lead to higher quality specifi cations and higher quality fastener securing devices and products. Engineers will have greater confi dence when specifying fasteners that have been tested to, and shown to comply with, the new standard. Research and development teams will have greater confi dence when exchanging data about the performance of specifi c locking mechanisms. There will also be a requirement for


some manufacturers to rapidly update their product testing/compliance to ensure that all of their products qualify under DIN 25201. Not to do so will lead to their products simply being removed from specifi cation sheets. Fortunately, there is now a new


generation of affordable, yet advanced high specifi cation Junker Test Benches and demonstrators available. These can help make this process smooth and swift, ensuring that the safety and quality of fasteners and locking mechanisms meets the most demanding standards of the new DIN 25201.


Company profi le Vibrationmaster designs and manufactures


advanced testing technology. Its products include Junker Test Benches to analyse and demonstrate the self-loosening behaviour of fasteners and bolted joints to DIN 65151 and the new DIN 25201. “With a head offi ce and R&D function in Denmark and advanced manufacturing facilities in India


and China, we operate globally. Our customers span the commercial, academic, research, public, government and not-for-profi t sectors. We offer highly reliable test solutions to organisations seeking innovative, market-proven and cost- effective technology to test and prove the reliability, consistency and safety of their products.”


128 Fastener + Fixing Magazine • Issue 71 September 2011


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