Influence of the flange surface of liquid sealed interfaces in mechanical engineering

摘要

The stress types that occur in actual practice with liquid-sealed static flat sealing joints are many and varied. A very large number of tests is required to examine all of the influencing factors. The number of required tests was greatly reduced by using statistical test planning. The evaluation of the tests showed that in general, the stress parameters (shearing, compression, temperature) have the greatest influence while the geometric parameters (flange material, sealing material and flange surface) are only of any significance in connection with stress. In combination with rough surfaces and high axial compression, shearing stress in particular leads to early leakage and a high level of wear. For this reason, the stress sources which affect the sealed joint should be reduced to a minimum when designing static sealed joints. Depending on the liquid sealant used, surface roughness should be pre-selected in accordance with the information supplied by the sealant manufacturer. The exact surface characteristics result from the manufacturing method used and the expected stress sources and levels.