This article demonstrates the effectiveness of vibration stress relief (VSR). VSR has been described in a number of written literature and its efficacy has been investigated by many researchers. The interesting thing about this article is that we do not use a common test method to detect the residual stress of a casting part. The diagnostics are performed acoustically, from which the natural frequency of the component is determined, from which, the residaul stress can be deduced. The aforementioned data play an important role in setting up a VSR. The results are significant because the new method significantly reduced the time of diagnostic. Last but not least, this type of diagnostics is easy to implement in industrial work areas, even factories and foundries, as it does not require a large area, is not energy and investment-intensive.

We have developed a new technique for diagnostics in connection with vibration stress relief. The measurement images developed by us with a unique acoustic spectrum recording are not only suitable for determining the natural frequencies of metal castings, but can also be deduced from them the dislocation in the crystal structure and residual stress, which can cause deformation later. From the changes between the measurement images, the effect of different machining even resting and aging on the casting can be seen. Furthermore, the required input frequency for vibration stress relief can be easily determined from the measured images. Some of the main advantages are the process obtained quickly, easily and immediately. The research will be continued, we are working further development, including the acoustic diagnostic system, the VSR equipment, the recording software with an online platform.