1. The cause of uneven steel pipes is the unevenness of the wall thickness caused by the adjustment of the pilot rolling center line, the inclination angle of the two rolling rollers, or too small the top of the top head, and the total length of the adjustment. Essence The main measures are to adjust the rolling center line of the perforated machine, so that the dumping angle of the two rollers is equal, and adjust the rolling machine according to the rolling table.
2. The reason for the uneven thickness of the linear wall is that the height of the core rod is not suitable for the height adjustment of the saddle. When the core rod is put on the hair tube on a certain side, it causes the hair tube to fall too fast on the contact surface, resulting in uneven wall thickness. Even staged defects. The gap between rolling rollers is too small or too large.
The central line deviation of the pipe rolling machine. The uneven amount under the pressure of the single and dual -machine frames will cause a straight -line symmetrical deviation of the ultra -thin (ultra -thick) direction of the steel pipe stand -alone frame, and the direction of the double -machine direction. The main measures are to adjust the height of the core stick to the saddle and ensure that the core rod and the hair tube are in the middle. When replacing the pore type and rolling specifications, the roller gap should be measured to keep the actual roll gap consistent with the rolling table. Use optical to adjust the rolling center line with the middle device, and the central line of the rolling machine must be corrected during the annual overhaul.
3. The unevenness of the unevenness of the head and tail wall is that the front end of the tube is cut, the curvature is too large, and the tube's hearthole is not correct to cause the steel tube's head wall thickness. The extension coefficient of perforation is too large, the roll speed is too high, and the rolling is unstable. The unstable throwing of the perforation machine can easily cause uneven thickness of the tube tube. The measures are to check the quality of the tube and prevent the tube of the front end of the tube from cutting the slope of the tube and the large amount of pressure. The replacement of the hole or the maintenance should be corrected. Use a lower perforation speed to ensure the stability of the rolling and the uniformity of the coat wall thickness. After the roller speed is adjusted, the matching guide discs are also adjusted accordingly.
