Rotating Expander Rolling Mill Tip Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The rolling mill of rotating expander type for tubular bodies faces instability issues due to the tip's inadequate vertical stabilization, leading to residual helicoidal irregularities and imperfect roundness of the expanded tube, which results in an ovalized and non-rectilinear shape at the outlet.
Innovation Solution
A tip-stabilizing system is integrated into the rolling mill, comprising two rollers with adjustable inclination and a stabilizing ring, which engages the expanded tube to prevent vertical fluctuation of the tip and introduce additional ovalization to compensate for residual imperfections, ensuring a circular and straighter tube section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tip is held only by guiding triads at outlet side, then the device complexity is reduced, but the manufacturing precision deteriorates due to tip oscillation and residual helicoidal irregularities
Solution Approach 1:
The guiding system is segmented into multiple functional components: guiding triads at the outlet side and additional stabilizing rollers positioned along the tube path. This segmentation allows each component to perform a specific stabilization function, with the stabilizing rollers correcting tip oscillations and the guiding triads providing outlet guidance, thereby improving manufacturing precision without excessive complexity
Solution Approach 2:
Stabilizing rollers are introduced as intermediary elements between the tip and the tube wall. These rollers act as mediators that apply controlled forces to prevent tip oscillation and eliminate helicoidal irregularities, improving tube roundness and straightness without requiring direct complex guidance mechanisms
2Manufacturing precision
If a second separate smoothing machine is installed, then the manufacturing precision improves by eliminating residual irregularities, but the device complexity and cost increase significantly
Solution Approach 1:
The stabilizing function previously requiring a separate smoothing machine is merged into the existing rolling mill by integrating stabilizing rollers and a stabilizing ring within the same device. This combination eliminates the need for a second separate machine while achieving the same effect of eliminating helicoidal irregularities and improving tube roundness
Solution Approach 2:
The stabilizing rollers and ring serve multiple functions simultaneously: they stabilize the tip vertically, eliminate helicoidal irregularities, and ensure proper tube roundness. This multi-functionality replaces what would otherwise require a dedicated separate smoothing machine, reducing overall device complexity
3Ease of operation
If the tip clearance is increased to allow free movement, then the ease of operation improves, but the stability of the tip deteriorates causing vertical oscillation
Solution Approach 1:
The clearance parameter between the tip and tube wall is optimized to a specific range that allows sufficient freedom of operation while preventing excessive vertical oscillation. The stabilizing rollers are positioned to engage the tube at controlled intervals, providing just enough constraint to maintain tip stability without over-constraining the system
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 tip-stabilizing system effectively eliminates residual irregularities, achieving a perfectly round and rectilinear tube shape by introducing additional ovalization and smoothing the surface, thereby enhancing the deformation process and reducing the need for separate smoothing machines.
Implementation Method 1
a stabilizing ring (16), placed behind the truncated cone part of the tip (3), with the effect to prevent the vertical fluctuation of the latter
Implementation Method 2
two rollers (7, 8), having a determined profile, which engage the expanded-section tube at the rolling mill outlet, in positions which are diametrically opposite to the tube
Data Source
AI summary
A rolling mill of rotating expander type for tubular bodies, comprising: working rollers (1, 2) arranged inclined with respect to the rolling axis; a tip (3) fitted on a beam (4), so that the tubular body is pushed in rotation between the rollers and the tip, and subjected to deformation in order to increase the perimeter; a tip-stabilizing system placed behind said tip, about the beam, and integrated in the rolling mill.