According to the different types of flange sealing surfaces, commonly used flanges include raised face flanges (also called flat flanges), concave and convex face flanges, and tongue and groove face flanges. The sealing surface of the raised face flange is flat and has a large contact area with the gasket. After pre-tightening, the gasket easily stretches or moves to both sides, resulting in poor sealing and is only suitable for low-pressure applications.
The forging process generally consists of the following steps, namely, selecting high-quality steel billets for blanking, heating, forming, and cooling after forging. The forging process methods include free forging, die forging and membrane forging. During production, different forging methods are selected according to the quality of the forgings and the size of the production batch.
Free forging has low productivity and large machining allowance, but the tools are simple and versatile, so it is widely used for forging single pieces with simple shapes and small batch production of forgings. Free forging equipment includes air hammers, steam-air hammers and hydraulic presses, which are suitable for the production of small, medium and large forgings respectively. Die forging has high productivity, simple operation, and easy mechanization and automation. Die forgings have high dimensional accuracy, small machining allowances, and more reasonable fiber tissue distribution, which can further increase the service life of the parts.
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