In a piping system, an elbow is a pipe that changes the direction of the pipe. According to the angle, there are three most commonly used 45° and 90°180°, and other abnormal angle elbows such as 60° are also included according to engineering needs. Elbows are made of cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics.
An elbow is a type of pipe used for turning a pipe. Among the total pipe fittings used in the piping system, the proportion is the largest, about 80%. Generally, different forming processes are selected for bends of different materials or wall thicknesses. The seamless elbow forming process commonly used in manufacturing plants has hot push, stamping, extrusion and the like.
The hot push elbow forming process adopts a special elbow pushing machine, a core mold and a heating device, so that the blank sleeved on the mold moves forward under the push of the pusher, is heated, expanded, and bent in motion. the process of. The deformation characteristic of the hot push elbow is to determine the diameter of the tube blank according to the law of the volume change of the metal material before and after plastic deformation. The diameter of the tube blank used is smaller than the diameter of the elbow, and the deformation process of the billet is controlled by the core mold to compress the inner arc. The flow of the metal compensates for other portions that are thinned by the expansion of the diameter, thereby obtaining an elbow having a uniform wall thickness.
Stamping forming elbow is the earliest forming process for mass production of seamless elbows. It has been replaced by hot pushing or other forming processes in the production of elbows of common specifications, but in some specifications of elbows due to the number of production Less, the wall thickness is too thick or too thin, and the product is still in use when it has special requirements.
Because the elbow has good comprehensive performance, it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, aerospace, shipbuilding and other basic projects.
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