Wall thickness precision steel pipe production control is a difficult process and improve the accuracy of precision steel wall thickness are mainly the following aspects:
1, heating pipes, heating should be uniform, rapid lifting ban temperature. Each heating and cooling, in order to maintain stability.
2, centering rollers, opening the same size centering rollers determine the installation is in place, embrace the central core volume adjustments related to the opening angle and various actions.
3, rolling centerline, the centerline of the car to ensure that rolling consistent with the centerline of the hole puncher avoid scrolling up and down "the tube to maintain a straight line.
4, rolling tool for head and other rolling tool wear should be promptly replaced.
5, rolling tool installation, the central leadership must ensure that the centerline of the centerline distance and rolling guide rollers perforated, which is equal to the distance from the upper and lower rollers are approximately equal.
6, perforation ram ram perforation usually selected outer diameter Φ108mm-Φ114mm, wall thickness and wall thickness requirements ≥25mm uniform thick-walled tube.
7, the mandrel mill, a mandrel to choose and the thick walled precision steel processing, the smaller size of the mandrel can be used in place of solid billet. Thickness uniformity walled tubes and solid billets, can make the probability of a significant reduction in the mandrel bending deformation, can effectively improve the precision steel tube wall thickness.
8, precision mandrel, the mandrel slenderness relatively large, generally using the first car and then hit the outside diameter of groove weld, directly open long or molding material. Mandrel outer precision control ± 0.1mm, straight mandrel deviation does not exceed 5mm. Welding, finishing insert a pin positioned between two sections of the mandrel, the total deviation to prevent the direct result of excessive welding.
9, process improvements, process improvement, prevent the intermediate precision steel pull thin wall thickness and increase exceeds the control range occurs.
