Abstract
Mechanical behavior of a knife-edge-type metal-seal flange system was examined on the variations of the displacement between the flanges and reaction forces of the tightening bolts during load steps such as tightening the bolts, setting up a transverse weight load on the flange surface and 300 °C baking and cool down. These were compared with a thermo-elasto-plastic finite element method structural analysis. Good agreement was obtained for both the flange deformation and reaction forces of the bolts and copper gasket between experimental and analytical results. Effects of the transverse load by a dummy weight mounted at the flange surface on the changes of reaction force of the bolts and on gasket deformation were considered to be negligibly small in the view of vacuum seal characteristics. The application of Inconel Belleville spring washers between bolt heads and flange surface was confirmed to be quite effective for the suppression of the bolt force looseness and gasket relaxation due to cyclic heating and cooling of the knife-edge-type metal-seal flange system.
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