Simple molding process of carbon steel elbow pipe

Simple molding process of carbon steel elbow pipe fittings  

Carbon steel elbow hot push process: hot push carbon steel elbow forming process is the use of commonly used elbow push machine, core die and heating device, so that the billet set on the mold under the push machine to move forward, in the movement of heating, expanding and bending forming process.  Hot push bend deformation characteristics are based on volume before and after plastic deformation rule of metal materials determine the pipe diameter, pipe diameter bend diameter, through the core module and control the deformation of the process, make the inner arc compressed metal flow, the compensation to other parts of the thinned by hole diameter, wall thickness uniform Angle is obtained.  Hot push elbow forming process has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, suitable for mass production, so it has become the main forming method of carbon steel, alloy steel elbow, and also used in the forming of some specifications of stainless steel elbow.  The heating method of forming process has medium frequency or high frequency induction heating (heating ring can be multi-ring or single ring), flame heating and reflector heating, which heating method according to the requirements of forming products and customers to produce forming.  

Carbon steel elbow can be divided into long radius elbow and short radius elbow according to their radius of curvature.  Long radius elbow refers to its radius of curvature equal to 1.5 times the outer diameter of the pipe, that is, R=1.5D.  Short radius elbow means that its radius of curvature is equal to the outer diameter of the pipe, that is, R= 1.0d.  (D is elbow diameter, R is radius of curvature.  D can also be expressed in terms of multiples.  According to the pressure grade, there are about 17 kinds of pipe standards, which are the same as those in the United States: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;  Sch80, Sch100, Sch120, Sch140, Sch160, XXS, among which STD and XS are commonly used.  According to the Angle of the elbow, there are 45° elbow, 90° elbow and 180° elbow.  The standards are GB/T12459-2005, GB/T13401-2005, GB/T10752-1995, HG/T21635-1987, D-GD0219, etc.