Forming standard for seamless elbows

Forming standard for seamless elbows

seamless elbow is also called seamless pipe elbow in English name seamless elbow or seamless pipe elbow. Because of its different manufacturing process, seamless elbow pipe can be divided into two kinds: hot rolled (extruded) seamless elbow pipe pipe and cold drawn (rolled) seamless elbow pipe pipe pipe. Cold drawn (rolled) pipe is divided into round pipe and irregular pipe two kinds.

The raw material of rolling seamless elbow pipe fittings is round pipe blank. Round pipe embryo is cut by cutting machine and processed into blank with growth degree of about one meter, and sent to furnace by conveyor belt for heating. The billet is fed into a furnace and heated to about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is the key problem. After the round tube billet comes out, it must pass through the pressure punch. Generally, the most common piercing machine is the conical roller piercing machine. This kind of piercing machine has high production efficiency, good product quality, large perforation diameter, and can wear a variety of pipe fittings. After the perforation, the round tube blank is successively rolled by three roller diagonal, continuous rolling or extrusion. After extrusion, remove the pipe and determine the diameter. The sizing machine rotates the steel embryo through the cone drill at high speed to punch holes and form pipe fittings.

Executive standard: GB/T12459-2017, GB/T13401-2017