Influence of Forming Adjustment of Welded Pipe on Pipeline Use

Forming adjustment is the basis of welded pipe adjustment. The industry recognizes that welded pipe adjustment is an art. Among them, forming adjustment is the jewel in the art palace. This art is concentrated in the adjustment process and results that vary from person to person, from unit to unit, and from material It varies from person to person, and even from environment to environment. Nevertheless, there are still some basic principles, basic operation methods and basic requirements for molding adjustment with common characteristics.

Basic principles of molding adjustment
Horizontal and vertical principle: This is the principle of forming adjustment. Horizontal and horizontal requirements: the upper and lower flat roller shafts should be flush with the horizontal plane, and one end should not be higher than the other. Make sure that the two axes are parallel and cannot be tilted. should also be parallel.
The verticality mainly requires that the vertical roller is perpendicular to the working table of the welded pipe unit, including the horizontal and vertical directions. The horizontal direction is related to the force of the tube blank, and the vertical direction is related to the stable operation of the tube blank.
The principle of correcting the rolls according to the rolling line has two connotations:
1. The height of the forming lower roll and vertical roll needs to be corrected according to the rolling bottom line, so as to ensure that the lower roll pass and vertical roll pass are consistent with the elevation of the rolling bottom line;
2. The pass symmetry of the forming lower roll and vertical roll needs to be inspected according to the rolling center line standard. Many problems and defects in the production of welded pipes have a lot to do with the misalignment of the lower roll and the deviation of the vertical roll from the rolling center line.
3. The principle of clear division of labor between the flat and vertical rolls. The forming flat rolls are responsible for power transmission and the main lateral deformation tasks, and the vertical rolls are mainly responsible for controlling the rebound of the tube blank after it exits the pass of the flat roll, and guide the formed tube blank to enter the next step smoothly. Flat roll pass.
In addition, excessive reliance on vertical roll forming will increase rolling resistance, which may lead to unstable operation of the formed tube blank, resulting in frustration, which will lead to a series of subsequent adverse consequences.
4. Equipment precision guarantee, which is the basic premise to ensure the smooth progress of forming adjustment and lasting forming adjustment results. It can be said with certainty that it is impossible to produce high-precision welded pipes with a "shaking head and tail" welded pipe unit.
5. The principle of timely solidification of the adjustment results means that the molding adjustment action is completed, and after the test run is normal, the adjusted parts should be tightened accordingly to prevent the thread from loosening again and the position changing again, resulting in wasted efforts.
6. The principle of invalid reset, the forming adjustment in the production of welded pipes, involves all aspects such as pass design, tube blank performance, geometric dimensions, equipment accuracy, operating habits, experience status of commissioning workers, human-machine mutual recognition, etc., and many other aspects belong to In the category of silent technology, this is a typical operation where experience is more than theory. Therefore, in the process of shaping and adjusting, trial and error is a common debugging method. When implementing an adjustment measure, if the expected result is not obtained, or the opposite is obtained As a result, it means that the measures are not correct, and the formed state needs to be restored to the original state in time.
7. The principle of choosing the lesser of two evils. In the adjustment of welded pipes, try to be as perfect as possible. However, when there is a dilemma, you must weigh the pros and cons and seek the good from the bad.
8. Systematic principle, which refers to adjusting the possible impact on the welding part and the sizing part during forming, or conversely considering the influence of the welding part and the sizing part on the forming, such as excessive consumption of the forming allowance, when the welding allowance is not enough Under the premise of changing, the sizing allowance will be too small, which will increase the difficulty of sizing adjustment.