Methods of manufacturing process for pipe bends

What is a pipe bend?

The pipe bends are one of the common used pipe fittings,that are bent by a set of pipe bending equipment.Pipe bends can be divided into two processes of cold rolling and hot pushing.No matter what kind of mechanical equipment and pipelines are used,most of them use bends, mainly used for oil transportation,gas transmission,infusion,construction of engineering bridges,etc.

Pipe bends typically have a minimum bending radius of 1.5 times pipe radius (R).If this bending radius is less than 1.5R,it is called elbow.The most regular pipe bends are 30 degree,45 degree,90 degree,the bending radius are 3D,5D,7D,10D,here the “D” means the nominal diameter of this bend.

 

Methods of manufacturing process for pipe bends

Stamping method: The pipe end is expanded to the required size and shape with a tapered core on the punching machine.

Bending formation method: There are three methods are more commonly used, one method is called stretching method, the other method is called pressing method, the third roller method, there are 3-4 rollers, two fixed rollers, one adjusting roller, adjusting With a fixed roll gap, the finished pipe is curved.

The ballooning deformation method: one is to place rubber in the tube, the upper part is compressed with a punch to make the tube protruding and formed; the other method is hydraulic bulging, filling the middle of the tube with liquid, and the liquid pressure is used to drum the tube. The shape of the bellows is mostly used in the production of this method.

Forging method: The end or part of the pipe is punched out by a swaging machine to reduce the outer diameter of the pipe. The common forging machine has a rotary type, a link type and a roller type. 3. Roller method: The core is placed in the tube, and the outer circumference is pressed by the roller for the round edge processing.

Roll forming method: generally do not use the mandrel, suitable for the inner edge of the thick-walled tube.

For different profile end faces, different molds, different extruders,the processing technology cannot be completely consistent,and it should be adjusted according to the performance of the extrusion equipment,so that the fixed machine can be fixed to ensure that the performance of the equipment and the performance of the raw materials complement each other.

Pipe bends specifications:

Size: 2″-48″(DN50-DN1200)

Standard: ASME/ANSI B16.49,MSS-SP-75,etc

Material: ASTM A860,API 5L GR.B/GR.42/GR.52/GR.60/GR.65/GR.70,ASTM A370,EN 10208-2,etc

Connect method: Butt welding.

Haihao Group can produce various types of pipe bends like 3D,5D,7D bends  and other pipe fittings such as elbows,caps,tees,reducers,etc,.and we supply piping products in different standards such as ANSI/ASME B16.5,ANSI/ASME B16.9,ANSI/ASME B16.11,EN 10253,EN 10241,MS SP-75,MSS SP-43,DIN 2605,DIN 2609,DIN 2615,DIN 2616,DIN 2617,GOST 17375,GOST 17376,GOST 17378,GOST 17379,GOST 17380,GOST 30753,JIS B2311,JIS B2312,JIS B2313,ISO 3419,ISO 5251,etc.If you want to know more about our piping products,please email us:sales@haihaogroup.com