Powertools on the test bench
In the product development of hammer drills, extensive testing of cost-intensive prototypes currently involves a considerable effort. In manual tests, the prototypes are tested by users on concrete substrates. However, this user-based testing leads to considerable variance in the test results. Moreover, such tests are resource-intensive, for in addition to the users, tools and concrete have to be provided and they need to be properly disposed of. Alternative tests involving hydraulic substitute substrates yield only partially meaningful results, as the hydraulic system generates different damping forces on the hammer drill than hammer drilling in concrete due to the design and temperature. This results in divergent loads and bears the risk of inaccurate results.
Scientists at the KIT Institute of Product Engineering (IPEK) have developed a novel substitute substrate. Here, the hammer drill transmits the impact and drilling torque to an input shaft. A generic braking torque is applied via belt pulleys in combination with a brake motor, which simulates real torque progressions. The impact force is transferred to the impact absorber, consisting of grey cast iron cylinder and friction spring. There, the impact force is converted into heat by the damping properties of the machine elements.
The substitute substrate reproduces the interactions between the hammer drill and the substrate realistically and reproducibly. This enables prototypes to be validated with a reduced effort and higher accuracy. Thus product development can be conducted on a significantly better data base, costs can be cut, and resources such as tools and concrete can be saved.
KIT is looking for companies that manufacture and sell test benches for power tools to further develop the new test environment.
Your contact person for this offer
Dr.-Ing. Philipp Scherer,
Karlsruhe Institute of Technology (KIT)
Innovation and Relations Management (IRM)
Phone: +49 721 608-28460