Impact Energy Absorbing Component With Locally Heated Bent Ridgelines
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Solution Overview
Problem
High-strength steel plates, despite their high strength, suffer from low toughness and ductility, leading to cracks before sufficient energy absorption during collisions, hindering their widespread use in collision components that require both high collision performance and excellent energy absorption characteristics.
Innovation Solution
A method involving local heating of bent ridgelines in collision components made from high-strength steel plates to a temperature of 600° C. to the AC1 point, which removes the work-hardened layer, enhancing both collision performance and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-strength steel plates are used for collision components, then collision performance is improved, but energy absorption capacity deteriorates due to low toughness and ductility
Solution Approach 1:
The patent applies local heating treatment specifically to the bent ridgeline portions of the collision component, creating a localized softening zone. This allows the majority of the component to maintain high strength from the high-strength steel plate, while the heated ridgeline areas gain improved toughness and ductility for better energy absorption. The local quality principle resolves the contradiction by applying different material properties to different regions of the same component.
Solution Approach 2:
The patent changes the temperature parameter of the steel plate by heating the bent ridgeline portions to a specific temperature range (Ac1 transformation point or higher). This parameter change transforms the material state from a work-hardened, brittle condition to a softened, more ductile state, enabling the high-strength steel to exhibit both high strength and good energy absorption characteristics simultaneously.
2Weight of moving object
If high-strength steel plates are used to reduce component thickness, then vehicle weight is reduced, but cracks occur before sufficient energy is absorbed
Solution Approach 1:
The patent applies local heating treatment specifically to the bent ridgeline portions of the collision component, creating a localized softening zone. This allows the majority of the component to maintain high strength from the high-strength steel plate, while the heated ridgeline areas gain improved toughness and ductility for better energy absorption. The local quality principle resolves the contradiction by applying different material properties to different regions of the same component.
Solution Approach 2:
The patent applies heating treatment beforehand to the bent ridgeline portions to remove work hardening and prevent crack initiation during collision. By pre-treating the vulnerable ridgeline areas, the component is cushioned against the harmful effect of premature cracking, allowing sufficient energy absorption to occur before any potential crack initiation.
3Manufacturing precision
If work-hardened layers are present in bent ridgelines, then manufacturing precision is maintained, but collision performance deteriorates due to reduced toughness
Solution Approach 1:
The patent applies local heating treatment specifically to the bent ridgeline portions of the collision component, creating a localized softening zone. This allows the majority of the component to maintain high strength from the high-strength steel plate, while the heated ridgeline areas gain improved toughness and ductility for better energy absorption. The local quality principle resolves the contradiction by applying different material properties to different regions of the same component.
Solution Approach 2:
The patent changes the temperature parameter of the steel plate by heating the bent ridgeline portions to a specific temperature range (Ac1 transformation point or higher). This parameter change transforms the material state from a work-hardened, brittle condition to a softened, more ductile state, enabling the high-strength steel to exhibit both high strength and good energy absorption characteristics simultaneously.
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 method achieves high collision performance and excellent energy absorption by maintaining maximum load while significantly increasing energy absorption capacity, up to 2.5 times, without significant decrease in maximum load.
Implementation Method 1
at least a part of a bent ridgeline generated by the processing is heated at a temperature of 600° C. to an AC1 point
Implementation Method 2
heating a ridgeline part of a collision member formed by press working at a temperature of 300 to 600° C. to remove the work-hardened layer
Data Source
AI summary
The present disclosure provides a method for manufacturing an impact energy absorbing component, and an impact energy absorbing component which achieve both high collision performance and excellent EA performance by local heating. A method for manufacturing an impact energy absorbing component is a method for manufacturing an impact energy absorbing component including a member formed by processing a steel plate, in which at least a part of a bent ridgeline generated by the processing is heated at a temperature of 600°° C. to an AC1 point. An impact energy absorbing component is an impact energy absorbing component including a member formed by processing a steel plate, in which at least a part of a bent ridgeline generated by the processing has a Vickers hardness equal to or lower than a Vickers hardness of each of flat surfaces constituting the impact energy absorbing component.