Lock Nut Spring Device for Combi Roll Torque Transfer
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Solution Overview
Problem
Existing mechanical spring systems for combi rolls used in metal rolling fail to maintain consistent torque transfer due to fatigue and deformation, leading to slipping between rings, and occupy valuable space in the roll design.
Innovation Solution
A roll design incorporating a mechanical compression spring device housed in a through hole of a lock nut, with a movable press body and support body, allowing for adjustable tension to maintain high prestress and prevent slipping, while not occupying roll width space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Belleville spring is placed inside the set of roll rings and spacer rings to provide spring force, then the spring can apply prestress to prevent slipping between rings, but the spring is continuously exposed to forces that deform and flatten it, resulting in fatigue and loss of prestress capability
Solution Approach 1:
The spring device is extracted from the interior of the roll rings and spacer rings and relocated to the lock nut. This removes the spring from the harmful environment where it was continuously deformed by adjacent rings, thereby preventing fatigue and maintaining reliable prestress capability throughout the service life.
Solution Approach 2:
The spring force is transmitted through a different spatial path - from the lock nut through a press body to the adjacent ring, rather than through direct contact within the ring set. This dimensional repositioning eliminates the harmful line contact and flattening forces that caused fatigue.
2Reliability
If a Belleville spring is placed inside the set of roll rings and spacer rings to provide spring force, then the spring can apply prestress to prevent slipping between rings, but the spring has only line contact with rings causing rapid wear
Solution Approach 1:
The spring is extracted from the interior positioning and relocated to the lock nut, eliminating the harmful line contact with adjacent rings that caused rapid wear. The spring now interacts only with the press body and support body, which are designed to distribute forces evenly.
Solution Approach 2:
A press body is introduced as an intermediary between the spring and the ring. This mediator distributes the spring force over a larger surface area, converting line contact into surface contact, thereby significantly reducing wear on both the spring and the rings.
3Reliability
If mechanical springs are used to prevent slipping between rings, then the springs can provide the necessary friction force, but the spring devices occupy valuable roll width space
Solution Approach 1:
The spring device is merged with the lock nut structure, which is an existing component of the roll assembly. By integrating the spring mechanism into the lock nut rather than adding separate external components, the solution maintains high torque transfer capability without increasing the overall roll width.
Solution Approach 2:
The spring, press body, and support body are nested within the through hole of the lock nut. This nested arrangement allows the spring device to be housed compactly within the existing lock nut volume, eliminating the need for additional space-consuming external components.
4Adaptability or versatility
If the spring tension is adjusted by a set screw inside the ring set, then the prestress can be readjusted, but the adjustment mechanism is difficult to access and the spring is exposed to deforming forces during adjustment
Solution Approach 1:
The adjustment mechanism is extracted from the interior of the ring set and relocated to the lock nut, making it externally accessible. The adjusting member can now be operated from outside the roll assembly, greatly improving ease of operation while maintaining prestress adjustability.
Solution Approach 2:
The lock nut structure itself serves as the housing for the adjustment mechanism. The adjusting member threads directly into the lock nut, allowing the lock nut to self-regulate the spring tension without requiring separate adjustment mechanisms or internal modifications to the ring set.
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 ensures reliable high prestress between rings, preventing slipping and allowing for easy adjustment and maintenance of spring tension, thus ensuring efficient torque transfer and prolonged roll operation without the need for additional space-consuming components.
Implementation Method 1
a mechanical compression spring acting between a front press body that is movable through an opening of the hole in order to constantly pass on a spring force generated by the compression spring
Data Source
AI summary
A ring, preferably in the form of a lock nut, made for combi rolls, which ring includes at least one spring device in which a mechanical compression spring is included that acts between, on one hand, a front press body that is movable to and fro in order to constantly forward a spring force generated by the compression spring and, on the other hand, a support body, which may assume a fixed position, but which is adjustably movable by way of a screw in order to alter the tension in the compression spring.