1. One of the causes of uneven wall thickness of steel pipes is the misalignment of the rolling centerline of the perforating machine. This can lead to unequal inclination angles between the two rolling rolls, resulting in uneven wall thickness, which usually presents in a spiral shape along the entire length of the steel pipe. The main solution to this problem is to adjust the rolling centerline of the perforating machine to ensure that the inclination angles of the two rollers are consistent, and adjust the pipe rolling machine according to the parameters given in the rolling table.
2. Another reason for uneven wall thickness of steel pipes is the uneven linear wall thickness. This usually due to improper height adjustment of the core rod pre threading saddle, which causes the core rod to only contact one side of the tube during pre threading, resulting in a rapid temperature drop on that side and causing uneven wall thickness. In addition, the gap between the rolling rolls in continuous rolling may also cause similar problems if it is too small or too large.
3. The centerline deviation of the pipe rolling machine is a key factor, which may lead to uneven pressure down between single and double machine frames, resulting in ultra-thin or ultra-thin steel pipes in the direction of the single machine frame, as well as ultra-thin or ultra-thin linear symmetry deviation in the direction of the double machine frame. To solve this problem, we need to ensure that the height of the core rod pre threading saddle is adjusted properly to ensure accurate alignment between the core rod and the tube. When replacing the hole type and rolling specifications, the gap between the rolling rolls should be carefully measured to ensure that the actual gap between the rolling rolls is consistent with the data in the rolling table.
