Cast carbon steel flange internal organization loose, uneven, strength, quality is difficult to ensure that the forging type is consumable, energy consumption, high cost, and disc, neck junction easily produce stress concentration and influence strength, rolling type can avoid the above problems.
Because the flange in the rolling process is a continuous rolling process in a hole type, the hole type is based on the outer contour of the test object. In order to facilitate metal flow and prevent local stress concentration, the intersection of cervical disc is designed into circular arc shape, in order to avoid the clamping phenomenon of metal in deformation, the groove design must have a certain slope.
The flange’s rolling type and the blank design have the very big relations, the different model has the different size design, so far, has not seen one certain formula can calculate the flange billet size. From the data, the blank design of the workpiece with the flange of the same special section ring is mostly based on the previous experience or the approximate section product design to give the rough shape, and then determine the optimum size of the blank by the test machine and the correction.
Because the flexible graphite has the plasticity and the good filling property, when using this kind of gasket, the matching flange seal surface does not need to carry on the precision processing, has the waterline on the flange seal surface, the groove also can adapt, relatively is economical. This gasket, also known as the flexible graphite metal reinforced composite gasket, is a kind of sealing gasket, which is made up of a metal toothed plate or punched metal core plate and a flexible graphite particle, which is usually made of flexible graphite composite reinforcing plate, and a typical flexible graphite metal reinforced composite flange gasket.
As required, flexible graphite metal reinforced composite flange gasket can be made into stainless steel or carbon steel inside or outside the package edge. The main features of this gasket are: good resistance to high, low temperature, corrosion resistance, radiation resistance and other properties, high strength, can be used under high-pressure conditions. The required preload is smaller than the use of metal gaskets or metal-wound gaskets
Because of the continuous distribution of the fiber in the rolled parts, the metal grain arrangement is tight and tidy, the forming is fast, the energy consumption is small, the material, the surface quality is good, the molding quantity is high, many advantages make the flange’s rolling type develop rapidly.