Seamless stainless steel elbow is a kind of pipe fitting used in the turning of the pipe. In the pipeline system used in all the pipe fittings, the largest proportion, about 80%. In general, different materials or wall thickness of the elbow will choose different forming processes.
At present, the stainless steel seamless elbow manufacturing plant commonly used stainless steel seamless elbow forming process is hot, stamping, extrusion and the like.
Hot bend forming process is the special Elbow push processing machine, a core mold and a heating device, which makes in the mold blank in pushing mechanism driven by forward motion and in the movement is heating, expanding diameter and bending forming process.
The deformation characteristics of the hot seamless stainless steel elbow is based on the metal plastic deformation before and after constant volume law to determine the tube diameter, the tube diameter less than the diameter of the elbow, the through mandrel control the blank deformation process, the arc by the compression of the metal flow, compensation for expanding and other parts of the thin, in order to get uniform wall thickness of seamless stainless steel elbow.
The hot pushing elbow forming process has the advantages of beautiful appearance, uniform thickness and continuous operation, suitable for mass production. Therefore, it becomes the main processing method of alloy steel, carbon steel elbow, and is also used in some specifications of stainless steel elbow forming.
In addition to outside the common forming process, stainless steel seamless elbow forming as well as the use of tube billet is extruded to the outside of the die, again through the tube blank pigging plastic forming process. But this process is relatively complicated, and the operation is troublesome, and the forming quality is inferior to that of the preceding process, so it is less used.
Source: Yaang Pipe Industry Co., Limited (www.yaang.com)