Seamless elbow: elbow is a kind of pipe fitting used for turning of pipe. In the pipeline system used in all the pipe fittings, the largest proportion, about 80%. In general, different forming processes are selected for different materials or wall thicknesses. The factory used seamless elbow forming process with hot stamping, extrusion, etc..

Hot forming

The hot pushing elbow forming process is the use of special elbow producing machine, mould and heating device, the set of billet in the mold on the forward movement in the push machine under the process in motion is heated, expanding and forming. The deformation characteristics of the hot pushing elbow is based on the law of constant volume plastic metal materials before and after deformation to determine the tube diameter, tube diameter less than the diameter of the elbow, the deformation process of mould blank control, the metal flow in the arc compressed, compensation due to expanding and reducing other parts of thin, so get the uniform wall thickness of elbow.

Has a beautiful shape, uniform wall thickness and continuous operation of the forming process of the hot pushing elbow, is suitable for mass production, and thus become the main forming method of carbon steel, alloy steel elbow, forming and application in some specifications of stainless steel elbow.

The heating method of forming process has the intermediate frequency or high-frequency induction heating (the heating coil can be multi circle or single ring), the flame heating and the reflection furnace heating.

Stamping forming

Stamping elbow is first used in the forming process of batch production of seamless elbow, elbow in the production of common specifications has been hot forming process or other alternatives, but in some specifications of the elbow due to the production quantity and the wall thickness too thick or too thin.

Stamping elbow points cold stamping and hot stamping two kinds, usually based on the properties of materials and equipment selection of cold stamping or hot stamping. The cold extrusion forming process is the use of special elbow bend forming machine, tube into the outer mold, lower mold clamping, driven by the push rods, tubes reserved along the inner mold and the external mold of the clearance and finish forming process.