Bio-Based Lubrication Oil Mixing for Cold Rolling Friction Control
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Solution Overview
Problem
Current lubrication oil supply methods for cold rolling are limited in their ability to maintain a suitable friction coefficient for various grades of steel sheets, particularly high tensile strength materials, due to facility constraints and cost considerations, leading to difficulties in controlling friction coefficient and surface quality.
Innovation Solution
A method involving the storage of multiple types of lubrication oils and additives in separate tanks, allowing for the selection and mixing of oils based on friction coefficient requirements, with controlled emulsion rates and concentrations, and switching between different emulsion ratios to achieve optimal friction coefficients across varying rolling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emulsion supplying rate or emulsion concentration is increased to reduce friction coefficient, then lubricity is improved, but cost increases and facility limitations are reached
Solution Approach 1:
The patent changes the chemical composition parameters of the lubrication oil itself, transitioning from conventional mineral oil-based lubricants to bio-based lubrication oils with specific fatty acid compositions (10-40% stearic acid, 5-30% oleic acid, 5-30% palmitic acid). This parameter change in the lubricant's chemical structure enables effective lubrication at lower concentrations and supplying rates, thereby improving reliability without pushing facility limits
Solution Approach 2:
The patent employs a disposable-like approach by using biodegradable bio-based lubrication oils that can be easily replaced and disposed of after use. This eliminates the need for complex facility systems for lubricant recycling and regeneration, reducing facility complexity while maintaining effective lubrication throughout the rolling process
2Reliability
If emulsion supplying rate or emulsion concentration is increased to reduce friction coefficient, then lubricity is improved, but cost increases
Solution Approach 1:
The patent changes the chemical parameters of the lubrication oil to bio-based formulations with specific triglyceride compositions and fatty acid profiles. These parameter changes enable the lubricant to provide effective lubrication at lower concentrations (reducing the quantity of substance required), thereby improving lubricity without proportionally increasing cost
Solution Approach 2:
The bio-based lubrication oils used are biodegradable and can be disposed of economically. This disposable characteristic reduces the overall cost by eliminating expensive recycling infrastructure and allowing simple replacement with inexpensive biodegradable formulations, improving lubricity without linear cost increase
3Adaptability or versatility
If multiple types of lubrication oil are used to control friction coefficient for different steel grades, then lubrication control is improved, but system complexity increases
Solution Approach 1:
The patent uses parameter changes within a single lubrication oil type by adjusting the ratio of three specific bio-based lubrication oils (each with defined fatty acid compositions) to achieve different friction coefficients. This approach provides adaptability for different steel grades while maintaining system simplicity, as it involves mixing variants of one base lubricant type rather than managing entirely different lubricant systems
Solution Approach 2:
The patent creates a composite lubrication oil formulation by combining three different bio-based lubrication oils in varying ratios. This composite approach enables fine-tuned control of friction characteristics for different steel grades while maintaining a unified, simple delivery system. The composite formulation provides the versatility of multiple lubricants with the simplicity of a single mixed oil type
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 flexible and precise control of lubrication, effectively managing friction coefficients for different steel grades, enhancing rolling efficiency and surface quality without the limitations of existing systems.
Implementation Method 1
supplying an emulsion of a lubrication oil and heated water mixed together
Data Source
AI summary
The present invention provides a method for supplying lubricant to various kinds of steel sheets with different qualities in cold rolling without any restrictions, such as lubricant supplying apparatus or lubrication conditions. This method comprises storing two or more kinds of lubricant such as A and B, having different compositions, selecting one lubricant or a mixture lubricant of the above A and B in accordance with the friction coefficient between the steel sheet to be cold rolled and a work-rolls, and supplying an emulsion comprising a mixture of the lubricant A and/or B and heated water.