Ductile Patch Metal Component for B-Pillar Energy Absorption
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Solution Overview
Problem
Existing methods for manufacturing metal structural components with shock-absorption zones, such as in B-pillars, often result in unnecessary weight and reduced overall form due to layered structures or inadequate reinforcement.
Innovation Solution
A method involving a U-shaped cross-section metal structural component with an intermediate zone of higher ductility metal, achieved by cutting out an opening in a planar blank, welding a ductile patch over the opening, and stamping the assembly to form the component, which enhances mechanical continuity and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a higher ductility material is used across the whole width of the controlled intrusion zone, then shock absorption capability is improved, but the B-pillar is prone to fold and breakage
Solution Approach 1:
The patent applies local quality by creating a ductility gradient within the controlled intrusion zone through controlled rolling. The rolling parameters (temperature, speed, passes) are specifically adjusted to produce varying ductility levels at different positions within the same zone, allowing the material to absorb shock effectively while maintaining structural integrity through localized property variation
2Reliability
If reinforcing members are added to prevent breakage, then structural integrity is improved, but unnecessary weight is added and overall form is affected
Solution Approach 1:
The patent employs parameter changes by modifying the material properties through controlled rolling parameters (temperature, rolling speed, number of passes, and inter-pass timing) to achieve the desired ductility gradient and structural integrity without adding external reinforcing members, thereby avoiding increased weight and form alterations
3Productivity
If integrated hot-stamping of various steel types is performed, then manufacturing efficiency is improved, but the layered structure adds weight and affects form
Solution Approach 1:
The patent applies segmentation by dividing the controlled intrusion zone into different regions with varying ductility levels through controlled rolling, allowing each region to serve its specific function in shock absorption while maintaining overall structural integrity, thereby achieving the desired performance without layered structures
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 effectively absorbs a high amount of impact energy by deforming the ductile patch and surrounding components, while maintaining structural integrity and reducing weight, thus improving the vehicle's crashworthiness.
Implementation Method 1
The intermediate zone has a greater ductility than a main material of the component that surrounds the intermediate zone... effectively absorbs a high amount of impact energy by deforming the ductile patch
Implementation Method 2
welding a ductile patch over the opening, and stamping the assembly to form the component
Data Source
AI summary
Method of manufacturing a metal structural component (E) for a vehicle, comprising the steps of a) providing a planar blank (B); b) cutting out the blank (B) to create an opening (A) having a first portion (Q) and wherein the first portion (Q) of the opening A) has a second length (lt) in a first transverse direction (T); c) welding a patch (P) to the blank (B) so as to cover the opening (A), the patch (P) being made of the metal having greater ductility than the material of the blank (B); d) stamping the assembly formed by the blank (B) and the patch (P) to obtain the component (E).