Carbon steel pipe elbow is to change the direction of the metal pipe fittings. Connections are threaded and welded. Angularly points, 45 ° and 90 ° 180 ° three most commonly used, according to project needs in addition also include other non-normal 60 ° angle bend. Elbow materials are cast iron, stainless steel, alloy steel, malleable iron, steel, nonferrous metals and plastics, the following small series with a look at the type of carbon steel elbow, carbon steel elbow classification, for your reference.
Carbon steel elbow English (Carbon steel elbow) first by its radius of curvature can be divided into long radius elbows and short radius elbow. Long radius elbow refers to its radius of curvature equal to 1.5 times the pipe diameter, ie R = 1.5D. Short radius elbow refers to its radius of curvature equal to the pipe diameter, ie R = 1.0D. (D is the diameter of the bend, R is the radius of curvature .D times can also be used to express.) If the pressing force rating points, about seventeen kinds, and the U.S. standard pipes are the same, there are: Sch5s, Sch10s, Sch10 , Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, which is the most common STD and XS two kinds. According to the angle of the elbow points, 45 ° elbow with 90 ° and 180 ° elbow bend. Implementation of standards GB / T12459-2005, GB / T13401-2005, GB / T10752-1995, HG / T21635-1987, D-GD0219 and the like.
Carbon steel elbow Process
Seamless elbow: elbow is a kind of pipe fitting pipe bend of. All fittings in piping systems used in the largest proportion, about 80%. Typically, the wall thickness of different materials or choose a different elbow forming process. Manufacturer of seamless elbow forming process commonly used hot push, stamping, extrusion and the like.
Heating and pushing process
Elbow push hot forming process is the use of special elbow pushing machine, mandrel and the heating device, so that the mold set in the blank under the impetus pushing machine forward movement, is heated in motion, expanding and bending the process of. Elbow push hot deformation characteristics of tube diameter is determined according to the law of constant volume before and after plastic deformation of the metal material, used in tube diameter smaller than the diameter of the elbow, through mandrel to control the deformation process of the blank, at the inner arc is compressed metal flow, to other parts of the compensation due to thinning of the diameter expands, thereby obtaining a uniform wall thickness of the elbow.
Elbow push hot forming process has a beautiful appearance, uniform thickness and continuous operation, suitable for mass production characteristics, and thus become carbon steel, alloy steel elbow main molding method, and also used in some types of stainless steel elbow the forming.
Heating process of forming intermediate frequency or high-frequency induction heating (heating coil may be a multi-turn or lap), flame heating furnace heating and reflection, depending on what kind of heating the shaped product and energy requirements of decisions.
Stamping
Stamping elbow was first used in mass production of seamless elbow forming process, has been replaced by extrapolation or other hot forming processes in the production of common specifications elbow, but because of the number of production in some of the specifications of the elbow less, the wall thickness is too thick or too thin.
Stamping elbow points cold stamping and hot stamping are two, usually choose cold stamping or hot stamping according to the material properties and equipment capacity. Cold extrusion forming process elbow is dedicated elbow forming machine, the outer tube into the mold, after the upper and lower mold clamping, push in the push rod, tube along the inner and outer dies reserved movement gap forming process is completed.
