Variable Wall Thickness Hydroformed Tube for Structural Parts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for forming structural parts with hydroformed tubular pieces often result in uniform wall thickness, which can lead to inefficient use of materials and inadequate mechanical performance, as they do not allow for variation in thickness to optimize strength and mass distribution.
Innovation Solution
A method involving the creation of a contiguous tubular member with varying wall thickness along its length, using multiple materials and processes like tube spinning, extrusion, and seam welding to produce parts with specific mechanical properties, and subsequent hydroforming to achieve desired shapes and crash performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If uniform wall thickness is used in hydroformed tubular pieces, then manufacturing is simpler, but mechanical performance is inadequate and material distribution is inefficient
Solution Approach 1:
The patent applies local quality by creating variable wall thickness in the tubular member, where different sections have different thicknesses optimized for their specific functional requirements. This allows thicker walls in high-stress areas and thinner walls in low-stress areas, improving mechanical performance while optimizing material distribution throughout the structure.
Solution Approach 2:
The patent uses preliminary action by forming the variable wall thickness profile in the tubular member before the hydroforming process. The tube is pre-shaped with varying thickness, then undergoes hydroforming to achieve the final complex geometry. This preliminary preparation enables the subsequent hydroforming to produce parts with optimized mechanical properties without requiring complex multi-step manufacturing processes.
2Quantity of substance
If variable wall thickness is implemented, then material distribution is optimized and mechanical performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by varying the wall thickness at different locations along the tubular member to match the local stress and load requirements. This optimized material distribution ensures that material is concentrated where needed for structural integrity and removed where unnecessary, achieving efficient material utilization throughout the component.
Solution Approach 2:
The variable wall thickness profile is established as a preliminary action before hydroforming. The tubular member is pre-formed with the desired thickness variation, which then serves as the basis for the subsequent hydroforming process. This approach simplifies the overall manufacturing by preparing the material distribution in advance rather than attempting to achieve it through complex multi-step forming operations.
3Strength
If multiple materials are joined to achieve variable thickness, then mechanical performance is optimized, but galvanic corrosion risk increases
Solution Approach 1:
The patent employs composite materials by joining tubular sections made from different materials to create the variable wall thickness structure. This allows each section to be made from the material best suited for its specific functional requirements, optimizing mechanical performance throughout the component while maintaining the benefits of material-specific properties in different zones.
Solution Approach 2:
The patent addresses galvanic corrosion risk by strategically selecting and arranging different materials in the composite structure. The design converts the potential harm of galvanic corrosion into a benefit by carefully controlling material interfaces and using appropriate material pairings, while the varied thickness profile itself helps manage stress distribution and reduce overall structural mass.
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
This approach enables the production of lightweight structural parts with optimized mechanical performance and reduced mass, while minimizing galvanic corrosion through strategic material selection and joining techniques, enhancing crash resistance and energy absorption.
Implementation Method 1
bending the tubular member; and hydroforming the tubular member into a part
Data Source
AI summary
One embodiment includes providing a contiguous tubular member including at least one of a first material or a second material, so that the tubular member has a wall thickness that varies along the length of the tubular member; bending the tubular member; and hydroforming the tubular member into a part.