Skin-Pass Roll Surface Structure for Wettability and Retention
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Solution Overview
Problem
Existing steel sheet tempering technologies face challenges in achieving optimal wettability and retention capacity, with open structures offering good wettability but poor retention, and closed structures providing good retention but poor wettability, leading to inefficiencies in the tempering process and reduced service life of tempering rollers.
Innovation Solution
A semi-open surface structure on the steel sheet or a semi-closed structure on the tempering roll is designed, with specific dimensions and ratios of depressions to elevations, allowing for enhanced wettability and retention properties, achieved through precise control of laser texturing or other surface modification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If an open surface structure is used on the steel sheet, then wettability is improved, but retention capacity deteriorates
Solution Approach 1:
The surface structure is designed with local variations in depression depth and connectivity. Some depressions are open to the surface while others are closed or semi-closed, creating different local zones with different functions: open zones for wettability and closed zones for retention capacity. This local differentiation resolves the contradiction between overall wettability and retention capacity.
2Quantity of substance
If a closed surface structure is used on the steel sheet, then retention capacity is improved, but wettability deteriorates
Solution Approach 1:
The surface structure is segmented into multiple types of depressions: completely open depressions, semi-open depressions, and closed depressions. Each segment serves a different function in the tempering process. The segmentation allows the surface to simultaneously provide pathways for tempering agent distribution (open segments) and retention zones (closed segments), resolving the contradiction between wettability and retention capacity.
3Manufacturing precision
If skin-pass forces are applied to imprint structure, then structure depth is improved, but skin-pass agent distribution deteriorates
Solution Approach 1:
The surface structure is pre-designed with channels and open depressions that facilitate the preliminary distribution of skin-pass agent before the imprinting force is applied. This preliminary action ensures that the agent is already positioned and distributed appropriately when the skin-pass roll applies force, preventing agent entrapment and ensuring uniform distribution even as deep structures are imprinted.
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 semi-open or semi-closed surface structures enable effective distribution of tempering agents, improved force transmission, and deeper embossing of structures into the steel sheet, while maintaining a balance between wettability and retention capacity, thus enhancing the economic efficiency and performance of the tempering process.
Implementation Method 1
Laser texturing processes are preferably used to be able to adjust targeted structures (positive shape) on the surface of a skin-passing roll by removing material
Data Source
Figure 1a)~1g)
AI summary
The invention relates to sheet steel that has been provided with a surface structure by skin pass rolling, a skin pass roll structured with a surface structure and a method for producing skin pass rolled sheet steel.