Deterministic Zinc-Coated Sheet Steel for Uniform Lubricant Distribution
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Solution Overview
Problem
The use of stochastic surface structures in skin-pass rolling of sheet steel coated with zinc-based coatings leads to uneven distribution of process media during forming operations, requiring excessive lubricant application and posing environmental and safety challenges, while also increasing costs and complexity in cleaning and processing.
Innovation Solution
A deterministic surface structure is applied to sheet steel coated with a zinc-based coating, featuring a design where the valley regions have a different surface chemistry compared to peak regions, allowing for improved wetting properties and reduced lubricant usage by utilizing a higher concentration of zinc and aluminum in the coating, which enhances the spreading and retention of process media in the valley regions through capillary forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stochastic surface structure is used in skin-pass rolling, then lubricant pockets are formed to hold lubricant, but uneven distribution of process media occurs and excessive lubricant application is required
Solution Approach 1:
The patent applies local quality by creating deterministic surface structures with specific geometric parameters (depth, width, spacing) that are uniformly distributed across the sheet metal surface. This deterministic pattern ensures consistent capillary forces and uniform lubricant distribution, replacing the random stochastic structure. The local geometric features are optimized to provide precise control over lubricant retention and distribution throughout the forming process.
Solution Approach 2:
The patent changes the surface structure parameters from random stochastic distribution to deterministic geometric patterns with controlled dimensions. By specifying particular parameters such as valley depth (5-50 µm), width (10-100 µm), and spacing (50-200 µm), the system achieves predictable and uniform lubricant distribution. This parameter control allows optimization of capillary forces to retain appropriate lubricant quantities without excessive application.
2Ease of operation
If additional oiling is applied to reduce frictional forces, then forming outcome is improved, but cost and cleaning outlay increase
Solution Approach 1:
The patent applies preliminary action by incorporating the lubricant distribution function directly into the surface structure during skin-pass rolling, before the forming operation begins. The deterministic surface structure with optimized geometric parameters pre-configures the sheet metal to distribute and retain lubricant uniformly during subsequent forming. This eliminates the need for additional oiling steps and complex lubricant application equipment, reducing process complexity while maintaining forming quality.
Solution Approach 2:
The deterministic surface structure provides self-service by automatically distributing and retaining lubricant through capillary forces during the forming operation. The geometric features (valleys and peaks) self-regulate lubricant distribution without requiring external intervention or additional lubricant application systems. This reduces both the complexity of the forming process and the costs associated with lubricant application and cleaning equipment.
3Reliability
If zinc-based coating is applied for corrosion control, then corrosion protection is improved, but surface chemistry becomes non-uniform after skin-pass rolling
Solution Approach 1:
The patent applies local quality by creating deterministic surface structures that control the local exposure of zinc and alloy elements during skin-pass rolling. The geometric features (valleys and peaks) are designed to produce controlled variations in surface chemistry that result in uniform wettability across the entire surface. This localized control of surface composition ensures consistent lubricant distribution while maintaining the corrosion protective function of the zinc-based coating.
Solution Approach 2:
The patent utilizes composite materials by combining zinc with alloy elements (Al, Mg, Si, etc.) in the coating structure. This composite coating provides both corrosion protection and controlled surface chemistry. The deterministic surface structure works in conjunction with the multi-element coating to achieve uniform wettability and lubricant distribution while maintaining reliable corrosion protection through the protective zinc and alloy element composition.
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
This approach enables a targeted reduction in process media usage, ensuring even distribution and improved forming properties by controlling local wetting phenomena, reducing friction, and enhancing tribological properties, thus reducing resource consumption and environmental impact.
Implementation Method 1
allowing for improved wetting properties and reduced lubricant usage by utilizing a higher concentration of zinc and aluminum in the coating, which enhances the spreading and retention of process media in the valley regions through capillary forces
Implementation Method 2
The wettability of the sheet metal material, both by aqueous media and for lubricants relevant to the forming operation, is not only dependent on the sheet metal topography. The local wettability is also influenced by the prevailing surface chemistry.
Data Source
AI summary
The invention relates to a sheet steel (1) coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure (2), and to a method for producing it.