Rolling Mill Roll Elastic Axial Constraint for On-Stand Turning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rolling mill stands face challenges with rolls that are either rigidly axially constrained, leading to potential damage from knocks and misalignments, or axially movable, which requires costly and complex removal and reshaping processes, resulting in increased downtime and risk of damage.
Innovation Solution
The implementation of an elastic constraint system for rolls, where at least one roll is rigidly mounted on a shaft with elastic means providing axial support, allowing for realignment and turning without removal, and adjustable preload to manage axial forces during rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rolls are rigidly axially constrained to the stand, then they can be turned directly on the stand without removal, but they are subjected to increased risk of breaking and damage from knocks and thrust excesses
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a rigid axial constraint to a dynamic elastic constraint system. The roll holder shaft is mounted on elastic means (such as springs or elastomeric elements) that allow controlled axial movement. This dynamic system enables the roll to absorb axial thrusts and knocks during operation while maintaining sufficient constraint for turning operations, thereby resolving the contradiction between ease of manufacture and reliability.
2Reliability
If rolls are axially movable to compensate for misalignments, then the risk of breaks and damage is reduced, but they require removal and remounting for turning operations which is lengthy and complicated
Solution Approach 1:
The patent applies the self-service principle by designing a system where the roll automatically realigns itself during operation through the elastic constraint mechanism. The elastic means allow the roll holder shaft to move axially and self-correct misalignments without external intervention. This eliminates the need for manual removal and remounting for realignment, reducing downtime while maintaining the reliability benefits of misalignment compensation.
3Reliability
If rolls are axially movable to realign during rolling, then misalignments are compensated, but the union of roll profiles deviates from the defined shape and increased movements cause leakages of process liquids
Solution Approach 1:
The patent applies the parameter changes principle by carefully controlling the stiffness and preload parameters of the elastic constraint system. The elastic means are designed with specific mechanical properties that allow sufficient movement for misalignment compensation while maintaining enough constraint to preserve the roll profile geometry. This balanced parameter selection prevents excessive movement that would cause profile deviation and process liquid leakage, while still providing the reliability benefits of misalignment compensation.
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
This solution enables axial movement and realignment of rolls during rolling, reduces the risk of damage, and allows for turning on the stand without disassembly, while being cost-effective and reducing operational complexity.
Implementation Method 1
elastic means (51, 52) interposed between said first portion (21) of roll holder shaft (20) and said first hollow support (40)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A rolling mill stand for rolling rod-shaped bodies, in particular tubular bodies, said stand comprising at least three rolls (10) mutually arranged to define a rolling pass line for said rod-shaped and/or tubular bodies, wherein at least one of said three rolls (10) is rigidly mounted on a roll holder shaft (20), freely fixed in turn in a rotational manner to said stand by means of a first hollow support (40) and a second hollow support (30) arranged on opposite sides of said at least one roll (10), respectively, wherein a first portion (21) and a second portion (22) of said roll holder shaft (20) are housed in said first hollow support (40) and in said second hollow support (30), respectively, where the constraint between at least said first hollow support and said first portion (21) of the roll holder shaft is of elastic type.