Variable Thickness Continuous Casting for Tailor Rolled Strips
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Solution Overview
Problem
Conventional tailor rolling processes struggle to achieve smooth, short transitions in thickness across the width of metal strips, requiring costly dynamic control systems and often resulting in inferior quality tailor rolled blanks with limited design flexibility.
Innovation Solution
A continuous casting process using patterned surfaces on casting rollers or blocks to create a solidified metal strip with an asymmetrical thickness profile, allowing for subsequent tailor rolling to achieve a second variable thickness profile that is at least 50% thinner, enabling the production of high-strength metal alloy components with tailored thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dynamic control roller systems are used to achieve variable thickness rolling, then thickness transitions can be controlled, but the system becomes costly and complex with limited ability to provide smooth, short transitions
Solution Approach 1:
The invention applies preliminary action by creating the variable thickness profile during the continuous casting process itself, before the rolling operation. The patterned casting rollers or blocks are designed with specific surface geometries that directly imprint the desired thickness variation onto the metal strip as it solidifies, eliminating the need for complex dynamic control during subsequent rolling operations.
Solution Approach 2:
The invention replaces the complex mechanical dynamic control roller system with a static patterned surface system. Instead of using actively controlled rollers that dynamically adjust gap heights, the invention uses casting rollers or blocks with predetermined patterned surfaces that passively create the variable thickness profile through their fixed geometric features during the casting process.
2Manufacturing precision
If conventional tailor rolling processes are used, then variable thickness blanks can be produced, but the quality and microstructure control are inferior
Solution Approach 1:
The invention performs the thickness tailoring action during the continuous casting process, which is the preliminary stage before rolling and final forming. By establishing the variable thickness profile while the metal is in a semi-solid or solidifying state, the invention enables better microstructure control throughout the subsequent processing stages, as the thickness variation is locked in during solidification rather than being imposed later through mechanical rolling.
3Adaptability or versatility
If multiple distinct pieces are assembled to create structural components with different thicknesses, then design flexibility is achieved, but welds and seams introduce weak regions and corrosion susceptibility
Solution Approach 1:
The invention applies local quality by creating a single continuous piece of metal with spatially varying thickness properties. Different regions of the same component can have different thicknesses and therefore different mechanical properties, all within a single monolithic structure produced by the patterned casting process, eliminating the need for assembling multiple pieces with welds or seams.
Solution Approach 2:
The invention merges the functionality of multiple distinct pieces into a single integrated component. By producing a variable thickness profile in a continuous casting process, the invention combines what would traditionally require multiple separately manufactured and welded pieces into one homogeneous structure, eliminating weak regions at joints and seams while maintaining design flexibility.
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 method provides superior control over thickness transitions, reduces production costs, and enhances the quality of tailor rolled blanks by allowing for more uniform microstructure control and increased design flexibility, enabling the creation of complex three-dimensional structural components with distinct load-carrying capacities.
Implementation Method 1
contacting a patterned surface of a casting roller or a casting block with a liquid metal, such as a liquid high-strength alloy, in a continuous casting process. The contacting solidifies the alloy and creates a profiled strip
Implementation Method 2
cooling the profiled strip having the asymmetrical thickness profile to form the high-strength metal alloy precursor having a tailored thickness
Data Source
AI summary
Methods of forming a high-strength metal alloy precursor by tailor-casting strips having a tailored thickness across a width of a strip material are provided. The tailor-cast strips have varying thickness throughout the width, which can then be further tailor rolled to a final required thickness profile/tailored thickness. Such tailor-casting method can be conducted by contacting a patterned surface of a casting roller or a casting block with a liquid high-strength metal alloy in a continuous casting process. The present disclosure provides methods of continuously casting a strip having varying thickness across the width allows for improved product in subsequent processing, like tailor rolling. Methods of making a high-strength metal alloy structural automotive component from a tailor-cast blank having a tailored thickness are also provided.