Levelmount_Machine_Mounts

30 Application Examples Example 1: In this example, the stability of an injection moulding machine was demonstrated. In such machines, opening and closing the mould plate causes inertial mass forces that could lead to the machine slip- ping. The static load is intensified and lightened alternately by the dynamic force. By calculating the resulting residual forces, and given the coefficient of friction, the stability of the machine can be derived. The dynamic movements, resulting from an elastic support, can be calculated for every point in the room. This is very important for dimensioning feeding systems etc. As a result, it was possible to op- timise isolating elements and their arrangement, already during the design phase. The practical result of this was subsequently verified with vibration measurements on the actual machine (see figure 3). Example 2: The second example shows how a difficult vibration problem was solved by selecting the correct element and exact tuning. The problem: An eccentric press was located on the third storey on top of a wooden floor. So far, the firmly mounted machine could be operated only with uneconomic 100 strokes/min. Using higher stroke rates, the weak wooden floor was exposed to unacceptably high vibration. The solution: The SLM pneumatic spring element was used as support. A sub- sequent re-measurement resulted in very good isolation results; however, rates above 180 strokes /min. caused unacceptably high machine movements. To reduce machine movements, SLM elements with viscose damping were used. After damper optimization, re-measurement demonstrated that all values for machine, operating personnel and building, had fallen to below – in some cases significantly below – their guidance levels. This was achieved although the machine out- put was more than doubled by increasing the rate to 240 strokes / min. (see figure 4). 2 40 80 120 160 200 Hub/min 4 6 8 10 Displace- ment (mm) without damping with damping Figure 3 Analysis of vibration measurements F V F V F H Figure 4