Also known as Yuanbao elbow, the elbow is made of sheet metal made of the same material as the pipe, which is stamped into a half circular elbow with a stamping die, and then the two half circular elbows are assembled and welded to form. Due to different welding standards for various types of pipelines, semi-finished products that are usually fixed in groups are usually shipped from the factory, and on-site construction is carried out according to the welding seam grade of the pipeline. Therefore, it is also known as a half welded elbow.
The processing of 8-shaped head is a production technology that utilizes the power of conventional or stamping equipment to directly deform the sheet metal in the mold, thereby obtaining product parts with shape, size, and performance. Sheet metal, molds, and equipment are the three essential elements of stamping processing. Stamping processing is a method of metal cold deformation processing. So, it is called cold stamping or sheet metal stamping, abbreviated as stamping. It is one of the main methods of metal plastic processing (or pressure processing) and also belongs to material forming engineering technology.
8-character production process:
First, weld a multi sided ring shell with a polygonal cross-section or a multi sided fan-shaped shell with closed ends. After filling the interior with pressure medium, apply internal pressure. Under the action of internal pressure, the cross-section gradually changes from polygonal to circular, and finally becomes a circular ring shell. According to the needs, a circular ring shell can be cut into 4 90 ° elbows or 6 60 ° elbows or other specifications of elbows. This process is suitable for manufacturing any large elbow with a ratio of the diameter of the stamped elbow to the inner diameter of the stamped elbow greater than 1.5D, and is currently the ideal method for manufacturing large elbows.
The advantages of the 8-shaped head production process are mainly manifested in the following aspects:
1. No need for pipe blanks as raw materials, which can save the cost of pipe making equipment and molds, and can be used for carbon steel elbows with any large diameter and relatively thin wall thickness.
2. The blank is a flat or expandable surface, making it easy to cut, precise, and easy to assemble and weld.
3. Due to the above two reasons, the manufacturing cycle can be shortened and production costs can be reduced. Because it does not require any equipment, it is particularly suitable for on-site processing of large carbon steel elbows.
4. Carbon steel stamped elbows are suitable for pipeline systems in industries such as petroleum, gas, chemical, hydropower, construction, and boilers.