Rolling Position Adjuster for Three-Roll Mandrel Mill Edge Stability
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Solution Overview
Problem
Three-roll mandrel mills face challenges in securing stable roll-biting of the front edge and maintaining circumferential length of the rear edge of seamless pipes or tubes, leading to inefficiencies and reduced yield due to plastic deformation and non-steady rolling phenomena.
Innovation Solution
A rolling position adjusting device that moves rolling rolls in a three-roll mandrel mill in the closing direction after the front and rear edges of the pipe material begin to roll, utilizing hydraulic cylinders and control units to detect edge timing and conveyance speed, thereby optimizing roll-biting and circumferential length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working ratio of pipe material per one rolling stand is increased in a three-roll mandrel mill, then equipment size is decreased and manufacturing capability is increased, but roll-biting stability of the front edge part deteriorates
Solution Approach 1:
The rolling rolls are made dynamically adjustable in their position along the axial direction of the pipe material. The rolling position adjusting device enables the rolling rolls to change their position dynamically, allowing optimization of roll-biting conditions for different sections of the pipe material while maintaining high productivity in the three-roll mandrel mill configuration
Solution Approach 2:
The rolling position adjusting device is configured to adjust the rolling rolls to optimal positions before the rolling process begins. By preliminarily positioning the rolling rolls at appropriate distances from the center of the pipe material, the system ensures stable roll-biting conditions are established in advance, preventing poor roll-biting of the front edge part
2Productivity
If the working ratio of pipe material per one rolling stand is increased in a three-roll mandrel mill, then equipment size is decreased, but circumferential length of the rear edge part decreases
Solution Approach 1:
The rolling rolls are made dynamically adjustable in their position along the axial direction of the pipe material. The rolling position adjusting device enables the rolling rolls to change their position dynamically, allowing optimization of roll-biting conditions for different sections of the pipe material while maintaining high productivity in the three-roll mandrel mill configuration
Solution Approach 2:
Different rolling rolls are positioned at different distances from the center of the pipe material according to their specific rolling stand position. This local optimization ensures that each rolling roll operates under optimal conditions for its specific location, maintaining circumferential length uniformity throughout the pipe material even when processing high working ratios
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively increases yield by reducing poor roll-biting and circumferential length issues, enhancing the manufacturing capability of seamless pipes or tubes by stabilizing the rolling process.
Implementation Method 1
utilizing hydraulic cylinders and control units to detect edge timing and conveyance speed
Data Source
Figure 1~2
Figure 3~4
AI summary
[Problem to be Solved] There is provided a device for adjusting the rolling positions of rolling rolls, which is capable of, for example, restraining poor roll-biting of the front edge part of a pipe material rolled by a three-roll mandrel mill. [Solution] The device 100 for adjusting the rolling positions of rolling rolls R1 to R6 constituting the three-roll mandrel mill includes pressing-down devices 1 (P1 to P6) for moving the rolling rolls R1 to R6 in the rolling direction and a control unit 2 for controlling the pressing-down devices 1. Immediately after the front edge part of a pipe material T has begun to be rolled by the rolling rolls disposed on at least one rolling stand of the rolling rolls R1 to R6, the control unit 2 controls the pressing-down device 1 to move the rolling rolls in the closing direction. Preferably, the control unit 2 moves the rolling rolls disposed on at least one rolling stand of the rolling rolls R1 to R6 in the closing direction at a speed of 16 mm/sec or higher by using the pressing-down device 1.