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The proportion of all pipe fittings used in the pipeline system is also large, which can be about 80%. Generally speaking, different forming processes are selected for elbows with different materials or wall thickness. The forming processes of seamless elbows commonly used by manufacturers include hot pushing, stamping, kneading, etc. The hot push elbow forming process is a process of selecting a special elbow pusher, core mold and heating equipment to make the blank set on the mold move forward under the promotion of the pusher, which is heated, expanded and formed in twists and turns in the movement.
The deformation feature of the hot push elbow is to determine the diameter of the pipe blank according to the law that the volume remains unchanged before and after the plastic deformation of the metal data. The diameter of the selected pipe blank is smaller than the diameter of the elbow. After the deformation process of the blank is controlled by the core mold, the condensed metal activity at the inner arc is compensated to other parts that are thinner due to the expansion, and then the elbow with uniform wall thickness is obtained.
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