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At AirLoc, we talk about problems with vibrations and machine dynamics (interference vibrations) if a machine that is susceptible to vibrations is disturbed by an external excitation, such as a neighbouring machine or passing lifting trucks.Interfering vibrations or impulse excitation can also be generated by the machine itself. Taking the applicable boundary conditions - such as maximum machine movement or acceleration - into consideration, this interference must be eliminated.
A new vibration measurement permits the effect of an implemented measure to be quantified exactly. If the results of the vibration measurement are still deemed insufficient, you can use the second vibration measurement and take additional measures to further minimize the vibrations.
This procedure permits efficient measures to be found inside a very short time that eliminate problems with vibrations and machine dynamics, and their efficiency to be verified with measuring results.
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Using vibration isolation pads with high-precision machines requires precise knowledge of the deflection behaviour of the isolation pads. A prognosis of the compression values allows a suitable time for re-leveling the machine to be defined that depends on the required level fidelity. This permits a perfect operation of the precision machine to be ensured, even after several years.
During the development of the AirLoc isolation pads, we attached great importance to keep the plastic deformation over time at the lowest level possible. For general applications without special requirements you can assume that at least 80% of the expected deflection are reached after 2 weeks. We therefore recommend that the machine is re-leveled after 2 weeks.
Besides many other parameters that are important for optimum isolation, we measure the deflection of AirLoc isolation plates in our own laboratory. The parameters of isolation pads for special applications of FEM analyses can thus be provided swiftly and easily. Each body has a natural frequency. This means that if it is excited by an external impact, it os-cillates in its own frequency.Frequency as defined here is the number of vibrations in a given time period.
Recently AirLoc was invited to the Okuma facility in Charlotte, NC to perform tests, evaluating AirLoc Elastomeric Pad materials’ ability to reduce internal machine vibration. An Okuma Captain L370 CNC lathe was selected for the test, performing a heavy cut on a 4” dia. steel bar. After obtaining machine and floor baseline readings, the accelerometer was placed on the machine frame, next to the cutting tool. Vibration readings were taken with the machine rigidly supported on its mounting feet and then supported on AirLoc 715 and 915 pads, while performing a heavy material cut.  AirLoc Pads under Okuma Lathe The results were impressive! Not only did the highly damped 715 pads reduce the peak energy levels by 50%, but the lathe maintained level within the required .02mm/m, and it has continued to do so as reported by Rod Tojdowski, Okuma Manager – Post Sales & Technology Resources. The 915 pads reduced vibration almost as well as the 715 pads, but would be better suited for heavier loadings. Both the AirLoc 715 and 915 pads are low profile, adding only ½ inch to the machine height. It’s well known in the chip making industry that higher level inputs of machine vibration can reduce cutting tool life. Now there’s a low cost solution to reducing this costly problem!
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9605 Tanager Drive Chardon, Ohio 44024 |
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