There are two existing cylindrical rolling processes. The first is to use a three roll plate rolling machine with pre bending function to press the head of the plate into the required arc on the plate rolling machine. The pre bent plate is then rolled into a circular cylindrical body on the plate rolling machine, and then subjected to straight seam welding, correction, non-destructive testing, and heat treatment (as needed); Although the general bending machine with pre bending function can meet the requirements, the net space between the rollers of the rolling machine cannot meet the width size of the steel plate, so a large press machine is necessary.

The second method is to use a four roll plate rolling machine with pre bending function to directly roll and form. The investment in a four roll plate rolling machine is also much greater than that of a regular three roll plate rolling machine. Both methods require significant equipment investment. Both of these traditional cylindrical rolling processes will increase production costs for enterprises.

So how should we cut the material? Is there any good way to draw circular or elliptical holes on the board? Therefore, during the rolling process, the inner half of the endothelium will be compressed; A piece of outer skin (outer half) will be stretched, only the diameter remains unchanged. So we can take the circumference according to the diameter and then cut the material. For circular pipes that are then cut into elbows and tees, software steel structure CAD can be used to automate the overall production of component cutting drawings with annotations. Not only has efficiency been improved, but personnel have also been reduced, and consistency has been improved.