The quality 180D elbow is a pipe fitting used for pipe bending. Among all pipe fittings used in the piping system, the proportion is relatively large, about 80%. Usually, elbows of different materials or wall thicknesses use different forming processes. At present, the commonly used elbow forming processes in quality 180D elbow manufacturing plants include hot pushing, stamping, extrusion and so on.

The hot push quality 180D elbow forming process is to use a special bending press, core mold and heating device to make the billet on the mold move forward under the push of the press, and it is heated, expanded and bent during the movement. The deformation characteristic of the hot push elbow is to determine the diameter of the tube blank according to the law of constant volume before and after the plastic deformation of the metal material. The diameter of the tube blank is smaller than the diameter of the elbow, and the core model is used to control the deformation process of the blank, so that the compressed metal flow at the inner arc is compensated to other parts of the expansion and thinning, so as to obtain an elbow with uniform wall thickness.
Stamping is a long-term forming process that has been used in seamless quality 180D elbow mass production. It has been replaced by hot pressing or other forming processes for the production of common specifications elbows, but in some specifications elbows , Its output is small, and the wall is too thick or too thin.
Before punching, the tube blank is placed on the lower mold, the inner core and the end mold are loaded into the tube blank, and the elbow is formed by the constraint of the outer mold and the support of the inner mold.
Compared with the hot forming process, the appearance quality of the stamping forming process is not as good as the hot pressing forming process. The outer arc of the stamping elbow is in a stretched state during the forming process. Because of its suitability for single-piece production and low cost, the stamping elbow technology is mainly used For the manufacture of small batches of thick-walled elbows.
Stamping quality 180D elbow is divided into cold stamping and hot stamping. Cold stamping or hot stamping is usually selected according to material properties and equipment capacity.