Metal Strip Tailored Properties via Variable Heat Treatment
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Solution Overview
Problem
Existing metal heat treatment processes often compromise on material properties, such as strength and ductility, and require substantial time and equipment, as improving one property typically diminishes another, and post-forming heat treatment is inefficient and costly.
Innovation Solution
A dimensionally variable heat treatment system that uses a heating unit and a cooling unit positioned on opposite sides of a separation plane to heat and cool a moving metal strip, allowing for tailored properties across different regions of the strip, such as varying strength and ductility, by maintaining specific temperature zones along the strip's width, length, or thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat treatment is applied to improve metal strength, then strength is improved, but ductility is reduced
Solution Approach 1:
The patent applies heat treatment to only specific regions of the metal strip where strength is needed, rather than treating the entire strip. This allows different regions to have different properties - heat-treated regions gain strength while untreated regions maintain ductility, resolving the contradiction between strength improvement and ductility preservation.
Solution Approach 2:
The metal strip is divided into multiple regions with different heat treatment conditions. Some regions receive heat treatment for strength, while other regions remain untreated or receive different treatment for ductility, allowing both properties to be optimized in different areas simultaneously.
2Strength
If post-forming heat treatment is applied, then material properties are improved, but manufacturing time and equipment costs increase
Solution Approach 1:
The patent applies heat treatment to the metal strip before forming operations, rather than after. This preliminary heat treatment prepares the material with appropriate properties upfront, eliminating the need for subsequent post-forming heat treatment and reducing total manufacturing time and equipment requirements.
Solution Approach 2:
The patent combines the heat treatment process with the forming process by applying heat treatment to the strip before forming, merging what would otherwise be separate sequential operations into an integrated workflow that reduces overall manufacturing time and equipment needs.
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
Enables the production of metal strips with tailored properties, reducing the need for additional heat treatment post-forming, minimizing equipment and labor costs, and enhancing the efficiency of the manufacturing process by applying heat treatment in real-time during processing.
Implementation Method 1
a heating unit positionable proximate the metal strip on a first side of a separation plane intersecting the metal strip to raise a strip temperature of a first portion of the metal strip on the first side of the separation plane at or above a heat treatment temperature
Implementation Method 2
a cooling unit positionable proximate the metal strip on a second side of the separation plane to maintain a second portion of the metal strip on the second side of the separation plane below the heat treatment temperature
Data Source
AI summary
Moving metal strips can be heat treated with any number or combination of dimensionally variable tempers across widths, lengths, or thicknesses of a metal strip. To provide dimensionally variable heat treatment, an apparatus can include one or more heating units suitable to increase the temperature of a metal strip moving proximate the apparatus to a heat treatment temperature. The apparatus can also include one or more cooling units positioned near the heating units to absorb heat and cool the metal strip to minimize the amount of heat transferred from a first region of the metal strip that is to be treated to a second region of the metal strip that is not to be treated.