Hybrid Steel-Aluminum Suspension Arm Casting
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Solution Overview
Problem
Conventional automobile suspension arm components joined by welding methods are prone to cracking under tensile loads, leading to separation and reduced functionality, and require materials of similar chemical composition for fusion welding, which limits weight reduction and introduces corrosion concerns.
Innovation Solution
A hybrid component is formed by deforming the open end of a tubular member and casting molten semi-solid aluminum onto the deformed end to create a coupling member, providing a strong and lightweight structure without the need for welding, using a steel member with a yield strength of at least 1300 MPa and a cast coupling with a yield strength of at least 180 MPa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding methods (fusion welding or friction agitation welding) are used to join tubular members and coupling members, then the component achieves structural integrity, but cracks occur at the joined portion under tensile load leading to separation and reduced functionality
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a cast-in-place operation where molten material is injected into the tubular member to form the coupling member. This eliminates the heat-affected zone and weld defects that cause cracking, while achieving equivalent or superior joint strength through metallurgical bonding of the cast material to the tubular wall.
Solution Approach 2:
The patent changes the joining method from post-assembly welding to in-process casting. By injecting molten material during the forming operation rather than welding assembled parts, the process creates a monolithic structure where the coupling member and tubular member become metallurgically bonded, eliminating interface cracks while maintaining structural integrity.
2Strength
If materials of similar chemical composition are used for fusion welding to achieve strength and corrosion resistance, then the component meets performance requirements, but the weight reduction opportunity is lost
Solution Approach 1:
The patent creates a composite structure by casting aluminum or aluminum alloy material into the tubular member. This allows the use of lightweight aluminum for the coupling member while maintaining strength through the cast-in-place bonding process, eliminating the need for heavy steel materials that would be required for welding dissimilar metals.
Solution Approach 2:
By replacing welding with cast-in-place operation, the patent enables the use of lightweight aluminum materials that would be difficult or impossible to join by welding to steel tubular members. The casting process naturally bonds dissimilar materials without requiring metallurgical compatibility, enabling weight reduction while maintaining structural performance.
3Weight of moving object
If tubular formed steel structure is used to reduce mass of the connecting member, then weight is reduced, but the complexity of joining with coupling members increases due to material compatibility requirements
Solution Approach 1:
The patent replaces complex welding operations with a simple cast-in-place operation. The tubular member is positioned in the die, and molten material is injected to form the coupling member directly inside the tube. This eliminates the need for precise alignment, fit-up, and welding parameter control, significantly simplifying manufacturing while maintaining weight reduction benefits.
Solution Approach 2:
The patent merges the tubular member and coupling member formation into a single cast-in-place operation. Rather than manufacturing separate parts and joining them through complex welding processes, the coupling member is formed in-place within the tubular member during the casting process, creating an integrated component in one step.
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 produces a lightweight, high-strength hybrid component that eliminates cracking issues and corrosion risks, achieving improved tensile and torsional strength while reducing material costs and weight compared to traditional components.
Implementation Method 1
deforming an open end of a tubular member to seal the open end
Implementation Method 2
casting molten material about the deformed open end to form a coupling member
Implementation Method 3
casting molten semi-solid aluminum onto the deformed end to create a coupling member, providing a strong and lightweight structure
Implementation Method 4
using a steel member with a yield strength of at least 1300 MPa
Implementation Method 5
hybrid component that includes a steel member formed of a high strength steel, and a cast coupling member cast on a portion of the steel member by casting-in-place a semi-solid aluminum
Data Source
AI summary
A hybrid component for lightweight, structural uses, including a steel member formed of a high strength steel; and a cast coupling member cast on a portion of the steel member by casting-in-place a semi-solid aluminum about the portion of the steel member, thereby positively and rigidly securing the coupling member to the steel member. A method of forming a hybrid component for lightweight, structural uses, including: forming a steel member formed of a high strength steel into a predetermined configuration; and casting a coupling member on a portion of the steel member by casting-in-place a semi-solid aluminum about the portion of the steel member, thereby positively and rigidly securing the coupling member to the steel member.