Views: 0 Author: Site Editor Publish Time: 2021-07-21 Origin: Site
Seamless elbow is fitting used at the bend of a pipe. In all the pipe fittings used more in the pipeline system, it accounts for a large proportion, about 80%. Usually, different forming processes are selected for elbow with different material wall thickness. At present. Manufacturer commonly used seamless elbow forming process are hot push, stamping, extrusion and so on. Seamless elbows do not corrode, pitting, rust or wear. Stainless steel is still one of the materials used in the construction of metal data. Because of the outstanding properties of stainless steel, it enables layout components to adhere to the integrity of the engineering design. Rolling seamless elbow pipe material is round billet, round tube embryos to cut boot cut processing growth degree of billet is about one meter, and the conveyor belt to the heating furnace, the billet are fed into the furnace, heating temperature of about 1200 degrees Celsius, furnace temperature control is the key question, circular tube billet after going through pressure punch wear empty, fuel for hydrogen or acetylene.
Seamless elbow processing technology many, hot pressing, push, welding, die forging, cold pressing and so on. The specification provides that the prefabricated insulation elbow should conform to standard EN448. It can be made of straight seamless or welded steel pipe by forging elbow, hot snug or cold bending method, and should not be made of inclined joint elbow made of straight pipe segment. National heat industry using elbow processing technology mainly hot bending, hot push bending, pressing, cold bending, welding bending and so on. The following are introduced the various elbow processing technology, as well as advantages and disadvantages.
Seamless elbow forging is a machining method that uses forging machinery to exert pressure on metal billet to produce plastic deformation, so as to obtain forgings with good mechanical properties, shape and size. Forging is a commonly used forming method in machine manufacturing. The mechanical properties of forgings are generally better than those of castings of the same material due to the loose casting state and welded holes of the metal through forging. For the important parts with high load and severe working conditions in machinery, forgings are mostly used in addition to the plate, profile or welding parts with simple shape that can be rolled.
Forging can be divided into cold forging and hot forging according to the temperature of blank during processing. Cold forging is generally performed at room temperature, while hot forging is performed at a recrystallization temperature higher than that of the blank metal. Sometimes the forging under heating condition, but the temperature does not exceed the recrystallization temperature, is called warm forging. However, this division is not uniform in production. According to the forming method, forging can be divided into free forging, die forging, cold pier, radial forging, extrusion, forming rolling, roll forging, roll rolling, etc. The deformation of billet under pressure is basically free forging, also known as open forging. The blank deformation of other forging methods is limited by the die, which is called closed mode forging. There is a relative rotation between the forming tools of forming rolling, roll forging and rolling and the blank, and the blank is pressed and formed point by point and asymptotically, so it is also called rotary forging.
The tradeoff between milling rate and service time is the decisive factor affecting the economy of seamless elbow material. In one test, the steel bag underwent fifteen wet feeds and ten dry milling. All sacks should be wet-machined in the future because of knife lumps and slight free surface wear after long periods of operation. Then an 81 mm diameter profile milling cutter with six blades is used. A 16.7 min dry milling of the surface above the stainless steel elbow pocket at the same cutting values significantly improves the service life of the stainless steel elbow compared to competitors' disc tools.