Roll-Formed Vehicle Pillar Structure for Strength and Visibility
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Solution Overview
Problem
Pillar members in vehicles face challenges in achieving high load-bearing performance while minimizing manufacturing costs and maintaining driver visibility, as existing methods result in large cross-sectional areas and increased expenses with ultra-high strength steel production.
Innovation Solution
A pillar member with a closed cross-sectional structure formed using a roll forming method, incorporating martensitic steel or other high-strength steels, featuring connection bonding portions on opposing side surfaces to reduce steel usage and welding, thereby improving load-bearing performance and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If press casting method is used to manufacture pillar members, then manufacturing process is simple, but cross-sectional area becomes large and load bearing performance is insufficient
Solution Approach 1:
The patent changes the manufacturing method from press casting to roll forming, which enables precise control of the cross-sectional shape and dimensions. This parameter change allows the pillar member to achieve optimized cross-sectional area with adequate load bearing performance while maintaining manufacturing efficiency
Solution Approach 2:
The pillar member is divided into multiple sections with different cross-sectional configurations along its length. The roll forming process enables different segments to have optimized shapes - some sections have larger cross-sectional areas for strength while others have smaller areas to reduce material usage and improve visibility
2Strength
If cross-sectional area of pillar member is increased to secure load bearing performance, then strength is improved, but driver visibility is obstructed
Solution Approach 1:
Different sections of the pillar member have different cross-sectional areas optimized for their specific functional requirements. Sections requiring high strength have larger cross-sectional areas, while sections near the windshield and side windows have smaller areas to minimize obstruction of driver visibility. This local differentiation resolves the contradiction between strength and visibility
3Strength
If giga-class ultra-high strength steel is used, then load bearing performance is improved, but manufacturing expenses are significantly increased
Solution Approach 1:
The patent changes the material specification from giga-class ultra-high strength steel to high-strength steel with tensile strength of 1320 MPa or more. This parameter change in material strength, combined with the optimized cross-sectional design from roll forming, achieves adequate load bearing performance at lower manufacturing cost
Solution Approach 2:
The pillar member may incorporate composite material structures or material combinations that optimize strength-to-cost ratio. The roll forming process allows for complex cross-sectional geometries that can achieve high structural efficiency with conventional high-strength steels, eliminating the need for more expensive ultra-high strength materials
4Strength
If hot press forming method is used to manufacture ultra-high strength steel, then strength is improved, but manufacturing expenses are significantly increased
Solution Approach 1:
The patent accepts using high-strength steel (1320 MPa or more) that, while not the absolute highest strength available, provides sufficient performance for the application. This choice of 'good enough' material with lower processing costs replaces the expensive hot press forming ultra-high strength steel, achieving cost-effective manufacturing
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 solution enhances load-bearing performance, decreases manufacturing expenses, and minimizes the cross-sectional area, ensuring improved structural stability and driver visibility by using a roll forming process with high-strength steels and optimized bonding techniques.
Implementation Method 1
the pillar body portion and the connection bonding portion are consecutively roll formed
Implementation Method 2
each closed cross-sectional portion and the associated connection bonding portion are bonded by welding
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention provides a pillar member of a vehicle, which is characterized by comprising: a pillar main body portion forming at least one closed cross section portion; and a connecting and joining portion provided on both ends of the pillar main body portion and coupled to a vehicle body. The pillar main body portion and the connecting and joining portion are continuously formed. The connecting and joining portion includes: a first connecting and joining portion provided on one side of the pillar main body portion; and a second connecting and joining portion provided on the other side of the pillar main body portion so as to face the first connecting and joining portion. The pillar main body portion is continuously formed through a roll forming technique in a region between the first connecting and joining portion and the second connecting and joining portion, and has an odd number of closed cross section portions formed therein.