Work Roll Scraper Tip Geometry for Stable Coolant Distribution
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Solution Overview
Problem
Existing stripping devices for applying liquid coolant to work rolls in rolling mills face issues with nozzle geometry changes due to wear, leading to uncontrolled coolant release and uneven distribution, which affects cooling efficiency.
Innovation Solution
A scraper device with parallel, planar flow guide surfaces and a separating plate with comb-like teeth ensures a constant nozzle geometry and even coolant distribution, using a collection chamber and zone control for precise coolant management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stripping device is positioned against the work roll surface, then cooling efficiency is improved, but the nozzle geometry changes due to wear leading to uncontrolled coolant release
Solution Approach 1:
The stripping device is divided into a replaceable stripper tip and a base body. The stripper tip containing the slot nozzle can be replaced when worn, while the base body remains stationary. This segmentation allows the precision-critical nozzle component to be periodically renewed, maintaining geometric accuracy while enabling continuous operation with the device positioned against the work roll for optimal cooling efficiency.
Solution Approach 2:
The invention introduces a replaceable stripper tip that can be exchanged based on wear conditions. This dynamic replacement strategy allows the system to adapt to wear over time, maintaining precise nozzle geometry and controlled coolant release while keeping the device in contact with the work roll surface for efficient cooling.
2Temperature
If coolant is applied to the work roll surface, then cooling effect is improved, but residual water flows onto the rolled material surface
Solution Approach 1:
The stripper tip acts as an intermediary between the coolant supply and the work roll surface. It directs coolant precisely onto the work roll through the slot nozzle while its geometry and positioning prevent residual water from reaching the rolled material. The tip serves as a controlled interface that achieves cooling while avoiding contamination.
Solution Approach 2:
The coolant application is localized precisely at the contact point between the stripper tip and work roll. The slot nozzle geometry and positioning ensure that coolant is applied only where needed on the work roll surface, with the stripper tip's structure preventing lateral spread onto the rolled material, thus achieving local cooling without contamination.
3Reliability
If coolant is applied with a gap between stripping device and work roll, then nozzle wear is prevented, but coolant distribution becomes uneven
Solution Approach 1:
The stripper tip is designed as a consumable, replaceable component that can be economically replaced when worn. This allows the device to operate in direct contact with the work roll for optimal coolant distribution, accepting that the tip will wear over time. The low cost of replacement tips enables frequent changes to maintain precision while keeping the device positioned for effective cooling.
Solution Approach 2:
The invention implements a discard-and-replace strategy for the stripper tip. When the tip becomes worn and coolant distribution degrades, the tip is discarded and replaced with a new one. This approach maintains optimal coolant distribution by ensuring the nozzle geometry remains precise, while the replaceable design prevents long-term wear damage to the permanent base body.
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
Maintains consistent coolant exit angle and efficient cooling despite wear, ensuring uniform coolant distribution and adjustable cooling capacity across the work roll surface.
Implementation Method 1
The base body has a cooling channel (122) that connects at least one inlet (130) with a slot nozzle (140) at the stripper tip (110) in a fluid-conducting manner
Implementation Method 2
the upper and the lower flow guide surfaces (142, 144) of the slot nozzle (140) - starting from the outlet opening of the slot nozzle (140) for the coolant - are aligned parallel to each other in the depth direction (y) over at least a predetermined wear length (l)
Implementation Method 3
a scraper device for applying a liquid coolant to the surface of a work roll (210) of a rolling stand (200)
Data Source
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AI summary
The invention relates to a scraping device (100) for applying a coolant onto the surface of a working roll in a roll stand (200) and for partitioning the material being rolled by means of the working roll from the coolant flowing from the working roll. The scraping device (100) has a scraper tip (110) and a main part (120) as a support for the scraper tip. The main part is equipped with a cooling channel (120) which is designed to supply a coolant to a slot nozzle which is formed on the scraper tip (110). In order to prevent the geometry of the outlet opening of the slot nozzle from changing in an undesired manner when the scraping device (100) is engaged against the surface of a working roll (210), the upper and lower flow guide surfaces of the slot nozzle (140) are designed to run preferably parallel to each other in the depth direction (y) at least over a specified wear length.