Floating Roll Stand Bearing Assembly for Axial Load Dissipation
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Solution Overview
Problem
Roll stands used in rolling mills face issues with frictional and wear problems due to high rotational speeds and large rolling forces, particularly with small-diameter rolls supporting high-strength steels, leading to potential ignition and burning from frictional heat at non-positive or frictional contact surfaces.
Innovation Solution
A roll stand design featuring a working roll mounted in a floating manner with a bearing module at one end, utilizing a fixed bearing assembly to absorb both radial and axial forces, decoupling the static supporting function from the rotational degree of freedom, and incorporating a supporting device for axial support, which allows for the dissipation of axial forces to the roll stand, thereby reducing wear and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-positive or frictional contact is used between supporting rolls and working rolls, then the roll stand can support small-diameter rolls with floating mounting, but frictional heat generates ignition risk and wear problems
Solution Approach 1:
The invention divides the supporting function into two independent parts: bearing modules mounted on the working rolls that handle radial loads through fixed bearing assemblies, and supporting rolls that only handle axial positioning through point contact. This segmentation eliminates the frictional contact between supporting rolls and working rolls, resolving the contradiction between floating mounting capability and frictional heat generation.
Solution Approach 2:
The invention introduces bearing modules as intermediary components between the working rolls and supporting rolls. These bearing modules contain fixed bearing assemblies that convert the radial load path, so the supporting rolls only contact the bearing modules at axial points rather than directly contacting the working rolls. This intermediary structure eliminates harmful friction while maintaining floating mounting capability.
2Stability of the object's composition
If supporting rolls are used to provide lateral support at axial end faces, then axial positioning is achieved, but the curved running surface causes frictional contact and wear under high rotational speeds
Solution Approach 1:
Instead of having the supporting rolls contact the working rolls directly with curved surfaces, the invention inverts the contact arrangement: the bearing modules mounted on the working rolls provide the contact surface, and the supporting rolls contact these bearing modules at axial points. This inversion transforms the frictional sliding contact into a point contact that only constrains axial movement without causing wear.
3Strength
If small-diameter rolls are used for high-strength steels, then rolling capability is achieved, but the rolls require floating mounting which necessitates intermediate rolls and supporting rolls, increasing system complexity
Solution Approach 1:
The invention merges the bearing function and the floating mounting function into integrated bearing modules that are mounted directly on the working rolls. Each bearing module contains a fixed bearing assembly that handles radial loads while allowing axial floating movement. This merging eliminates the need for separate intermediate rolls and supporting rolls, reducing system complexity while maintaining the capability to support small-diameter rolls for high-strength steels.
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 design enhances the frictional and wear behavior of the roll stand, providing stable operation by decoupling support and rotation, reducing the load on supporting components, and eliminating the need for additional axial adjusting means, thus preventing ignition and improving operational safety.
Implementation Method 1
a fixed bearing assembly, in which the working roll is mounted and by means of which the working roll is supported in a fixed manner
Implementation Method 2
It is thereby possible to absorb mechanical or thermal changes in length, in particular of the elements to be supported, without distortion of the bearing assemblies
Data Source
AI summary
The invention relates to a roll stand, comprising: a working roll, which is mounted in the roll stand floatingly and for rotation about an axis of rotation extending axially and which has two axially opposite end faces; and at least one bearing assembly, which is arranged on one of the two end faces of the working roll and by means of which the working roll is floatingly supported in the roll stand and which has a housing, in which the working roll is mounted using a fixed bearing. According to the invention, the bearing assembly has a supporting device, by means of which the bearing assembly can be axially supported in the roll stand.