P9 elbow

P9 elbow is a general term for a variety of elbows, with various materials, such as carbon steel, manganese steel, nickel steel, etc. P9 elbow is often used as a pipe fitting link product at the pipe bend, connecting two pipes with the same nominal diameter to make the pipe turn 90 °

P9 elbow manufacturing standards include: GB, ANIS, JIS, BS, DIN, UNI, etc

P9 elbow is divided into three common types according to angle: 45 ° and 90 ° 180 °. In addition, other abnormal angles such as 60 ° P9 elbow are also included according to project requirements; According to the production method, it can be divided into: pushing, pressing, forging, casting, etc. (Now they are generally pure forged)

P9 elbow can be divided into pushing, pressing, forging, casting, etc. according to the manufacturing method. (Now they are generally pure forged)

P9 elbow can be divided into long radius elbow and short radius P9 elbow according to curvature radius. The long radius P9 elbow refers to the outer diameter of the pipe whose curvature radius is equal to 1.5 times, that is, R=1.5D. The short radius P9 elbow means that its curvature radius is equal to the outer diameter of the pipe, that is, R=1.0D. (D is the diameter of P9 elbow, R is the radius of curvature)

The manufacturing method of P9 elbow:. The deformation feature of hot push elbow is to determine the diameter of tube blank according to the rule that the volume of metal material remains unchanged before and after plastic deformation. The diameter of tube blank used is smaller than the diameter of elbow. The deformation process of the blank is controlled by the core mold, so that the compressed metal at the inner arc flows and is compensated to other parts that are thinner due to expanding, so that the elbow with uniform wall thickness is deeply embedded

The hot push elbow forming process has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, which is suitable for mass production. Therefore, it has become the main forming method of carbon steel and alloy steel elbows, and also used in the forming of certain specifications of stainless steel elbows

The heating methods in the forming process include medium frequency or high frequency induction heating (heating coils can be multiple coils or single coils), flame heating and reverberatory furnace heating. The heating method used depends on the requirements of the formed products and the energy situation

2. Stamping forming

Stamping forming elbow is a forming process that has long been used for mass production of seamless elbow. It has been replaced by hot pushing method or other forming processes in the production of elbow with common specifications. However, in some elbow specifications, the production quantity is small, the wall thickness is too thick or too thin

The product is still used in case of special requirements. The pipe blank with the same outer diameter as the elbow shall be used for the stamping forming of the elbow, and the press shall be used for direct pressing in the die

Before stamping, the tube blank is placed on the lower die, the inner core and end die are installed into the tube blank, the upper die moves downward and starts to press, and the elbow is formed by the constraint of the outer die and the support of the inner die