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Manufacturing process of large diameter elbow

2021-04-24 13:33:29
What are the manufacturing processes of large diameter elbow? The bending process of straight pipe can reach the temperature of plastic deformation through intermediate frequency heating, and then the straight pipe forms a large diameter elbow with specified radian through the constraint of mechanical arm. Its manufacturing process is called simmer bending. By heating the pipe and adding plasticity, the mechanical strength is reduced, and then the power required for bending is reduced to simmer the pipe.
 
The following processes should be paid attention to in the manufacturing of simmer bend pipe:
 
1. When the ellipticity or wrinkle unevenness exceeds the standard, it can only be scrapped and simmered separately.
 
2. In order to reduce the deformation of the cross section of the pipe, it is necessary to pour the river sand dried by heating into the pipe, and strike the pipe wall along with the pouring, so as to ensure that the dry sand is filled and compacted
 
3. The heating temperature of the bending section should be controlled in a certain range, too high or too low will affect the quality of the bending. When selecting cold bending and bending, the selection of mould should be appropriate; In order to avoid cross-section deformation, the pipe should be filled with sand and compacted, and then the suitable mould should be selected for bending.
 
4. For industrial pipes with nominal diameter less than or equal to 200 mm, simmer bends shall be used as far as possible. When the simmer bend cannot be selected, the welded bend can be selected. When rigid PVC plastic pipe is used as water supply and drainage pipe, the sharp bend of injection molding can be selected. Generally, welded elbows are used for rolled and welded straight seam pipes with nominal diameter greater than 200 mm.

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