Hot-Stamping Formed Article With Protrusion Portions
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Solution Overview
Problem
Current structural members for vehicles, such as side sills, require enhanced collision safety performance and higher strength characteristics in three-point bending tests to improve impact absorption and compression resistance.
Innovation Solution
A hot-stamping formed article with a specific structure featuring two standing wall portions, a top sheet portion, and protrusion portions where the angle between the top sheet and protrusion is greater than 90°, and a manufacturing method involving hot-stamping of high-strength steel sheets to create a double structure with overlapping steel sheets, enhancing tensile strength and Vickers hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional structural members with simple hat-shaped cross sections are used, then manufacturing is simple, but collision safety performance and three-point bending characteristics are insufficient
Solution Approach 1:
The structural member is divided into multiple wall portions (first standing wall portion, second standing wall portion, top wall portion, bottom wall portion) with distinct functions. Each portion is optimized independently to contribute to overall collision safety performance while maintaining manufacturability through modular design
Solution Approach 2:
The cross-sectional geometry is enhanced by adding protrusion portions that extend in the width direction, creating a more complex three-dimensional structure from a basic hat-shape. This dimensional enhancement improves three-point bending characteristics and collision safety without requiring multiple separate components
2Use of energy by moving object
If steel sheets are folded in three layers to improve impact absorption, then energy absorption increases, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The protrusion portions are strategically positioned at specific locations where energy absorption is most critical during impact. The local geometric modification concentrates energy dissipation capabilities at key stress points rather than requiring uniform complexity throughout the entire structure
Solution Approach 2:
The cross-sectional area and geometric parameters of the protrusion portions are optimized to achieve desired energy absorption characteristics. By adjusting dimensions such as protrusion height, width, and position, the energy absorption capacity is tuned without fundamentally changing the manufacturing process
3Strength
If recessed parts are formed by pressing with power supply rollers, then local reinforcement is achieved, but protrusion portions cannot be formed
Solution Approach 1:
Instead of forming recessed parts by pressing inward, the invention forms protrusion portions that extend outward from the wall portions. This inverted approach achieves local reinforcement by adding material volume rather than removing it, enabling the creation of external geometric features that enhance structural performance
4Device complexity
If connection regions are extended outward to increase ridges, then structural complexity increases, but folding is avoided
Solution Approach 1:
The protrusion portions are formed as integral features of the pressed steel sheet before assembly, rather than being created through subsequent folding operations. This preliminary formation of geometric features simplifies the manufacturing process by eliminating complex folding steps while achieving the desired multi-ridge structure
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 achieves a hot-stamping formed article with improved strength and three-point bending characteristics, allowing for effective collision safety performance and easy manufacturing, while maintaining high tensile strength and energy absorption.
Implementation Method 1
a hot-stamping formed article, a structural member using the same, and a manufacturing method of hot-stamping formed article
Implementation Method 2
hot-stamping formed article having high strength and high characteristics in a three-point bending test
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A
AI summary
The present invention provides a hot-stamping formed article which is long and formed of a single steel sheet, the hot-stamping formed article including: two standing wall portions; a top sheet portion adjacent to the two standing wall portions; and a protrusion portion including an overlapping portion in which a portion of the steel sheet extending from at least one standing wall portion of the two standing wall portions and a portion of the steel sheet extending from the top sheet portion overlap, in which an angle between the top sheet portion and the protrusion portion in a case where a plane perpendicular to a longitudinal direction of the hot-stamping formed article is viewed in a cross section is larger than 90°.