Hot Dip Metal Plating Bath Roll Groove Design for Dross Management
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Solution Overview
Problem
In hot dip metal plating apparatuses, increasing the speed of the steel strip leads to slip between the steel strip and the bath roll, causing flaws on the steel sheet surface and reducing the rotating ability of the bath roll due to dross buildup in grooves, which existing groove designs fail to adequately address.
Innovation Solution
A hot dip metal plating bath roll with vertically and horizontally oriented grooves, where the pitch and depth of the vertical grooves satisfy specific formulas, and the depth and width of the horizontal grooves are optimized to facilitate effective discharge of dross, preventing slip and improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the running speed of the steel strip is increased to improve productivity, then the productivity is improved, but slip occurs between the steel strip and the bath roll causing flaws on the steel strip surface
Solution Approach 1:
The bath roll surface is segmented into multiple groove structures (vertical grooves, horizontal grooves, and inclined grooves) that divide the contact area between the steel strip and bath roll. This segmentation allows molten metal and dross to be channeled into specific discharge paths, preventing buildup that would cause slip and surface flaws, thereby enabling higher running speeds without compromising surface quality.
Solution Approach 2:
The invention introduces grooves extending in multiple dimensions (vertical, horizontal, and inclined directions) rather than a single flat or simple pattern. This multi-dimensional groove configuration creates three-dimensional channels for molten metal flow, improving discharge efficiency and preventing dross accumulation, which resolves the slip problem at high speeds.
2Object-generated harmful factors
If grooves are formed on the bath roll surface to discharge molten metal containing dross, then dross discharge is improved, but the rotating ability of the bath roll deteriorates due to dross buildup in the grooves
Solution Approach 1:
Different regions of the bath roll surface are given different groove characteristics (vertical grooves for initial collection, horizontal grooves for lateral discharge, inclined grooves for gravitational flow). This local differentiation optimizes dross discharge at each stage while maintaining sufficient contact area for rotation, preventing the trade-off between discharge efficiency and rotational ability.
Solution Approach 2:
The grooves, which initially seem to create resistance to rotation, are designed with specific dimensions and orientations that actually facilitate molten metal flow and dross discharge. The harmful effect of grooves (increased surface roughness, potential rotation resistance) is converted into a benefit by optimizing their geometry to channel fluids efficiently, thereby improving both discharge and rotation.
3Object-generated harmful factors
If vertical grooves are formed continuously in the circumferential direction to discharge molten metal, then discharge efficiency is improved, but dross deposits and builds up in the grooves at high speeds
Solution Approach 1:
The invention merges vertical grooves with horizontal grooves and inclined grooves to create a combined discharge system. The vertical grooves collect molten metal, which then flows into horizontal and inclined grooves for final discharge. This merged system prevents dross buildup by providing multiple discharge paths, ensuring reliable operation at high speeds.
Solution Approach 2:
The groove structures are designed to preliminarily collect and channel molten metal before it can solidify or accumulate dross. By providing pre-configured discharge paths (vertical, horizontal, and inclined grooves), the system prevents dross deposition before it becomes a problem, ensuring continuous reliable operation.
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 optimized groove design prevents flaws on the steel sheet and ensures stable high-speed running, enhancing the productivity of plated steel sheets by effectively managing dross discharge and reducing slip between the steel strip and the bath roll.
Implementation Method 1
by forming grooves continuing in the circumferential direction in the surface of the bath roll (vertical grooves) or grooves continuing in the barrel length direction (horizontal grooves and extended grooves) in this way, it becomes possible to quickly discharge molten metal containing dross
Implementation Method 2
the pitch P1 (mm) and depth d1 (mm) of the vertical grooves satisfy the following formulas (101) to (103)... a width w2 (mm) of the horizontal grooves being 2 times or more of the depth d2 or 2 times or more of a radius of curvature (mm) of curved surfaces forming bottom parts of the horizontal grooves
Data Source
AI summary
A hot dip metal plating bath roll preventing flaws in a steel sheet due to a bath roll, realizing stable running at a high speed, and improving the productivity of a plated steel sheet, which hot dip metal plating bath roll having vertical grooves each formed on an outer circumferential surface of the roll and including two first curved parts projecting to the outside of the roll and at least one second curved part arranged between the two first curved part and projecting to the inside of the roll and horizontal grooves each formed on an outer circumferential surface of the roll along a barrel length direction of the roll, a pitch P1 (mm) and depth d1 (mm) of the vertical grooves satisfying 1.0≤P1≤10, 0.2≤d1≤5, and d1≤P1/2, a depth d2 (mm) being 60% to 150% of the depth d1 of the vertical grooves, and a width w2 (mm) of the horizontal grooves being 2 times or more of the depth d2 or 2 times or more of a radius of curvature (mm) of curved surfaces forming bottom parts of the horizontal grooves and 0.7 times or less of a pitch P2 (mm), the pitch P2 (mm) of the horizontal grooves being 1.0≤P2≤10.