Mechanical Metal Joint Using Friction-Formed Interlocking Caps
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Solution Overview
Problem
Mechanical joining of dissimilar metal sheets, such as aluminum and steel, is challenging with conventional methods like welding and adhesives, as they fail to effectively address weight and operational requirements in vehicle components.
Innovation Solution
A method involving a rotating press bit that heats the surface of a second metal sheet to a semisolid state, flowing the heated metal through an aperture in a first metal sheet to form a cap on its outer surface, securing the sheets together with enhanced strength and geometric interlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional welding or adhesives are used to join dissimilar metal sheets, then the joining process is straightforward, but the joint fails to meet weight reduction and operational performance requirements
Solution Approach 1:
The invention changes the physical state of metal from solid to semisolid through controlled heating, enabling the metal to flow and form interlocking caps that provide superior joint strength while using lighter dissimilar materials
Solution Approach 2:
The invention joins dissimilar metal materials (e.g., aluminum and steel) to create composite structures that optimize the weight-strength balance by selecting materials with appropriate properties for specific structural requirements
2Weight of moving object
If dissimilar materials are used to reduce weight, then fuel economy improves, but mechanical joining becomes difficult with conventional methods
Solution Approach 1:
The invention replaces conventional mechanical joining methods (welding, adhesives) with a friction-based heating system that uses rotational friction to generate heat and plasticize the metal for flow and interlocking
Solution Approach 2:
The invention changes the physical state of metal through controlled temperature parameters, heating to semisolid state to enable flow and interlocking, thereby facilitating joining of dissimilar materials
3Strength
If a rotating bit is used to heat and flow metal, then joint strength and geometric interlocking are enhanced, but the process complexity increases
Solution Approach 1:
The invention combines heating, plasticizing, and forming operations into a single rotating friction bit tool that performs all functions simultaneously during one continuous motion through the metal sheet
Solution Approach 2:
The rotating bit generates its own heat through friction with the metal surface, eliminating the need for external heating sources and simplifying the overall process equipment requirements
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 method effectively joins dissimilar metal sheets, improving impact energy absorption and reducing weight, while providing additional strength and reducing deformation, thus addressing the limitations of conventional joining techniques.
Implementation Method 1
translating a rotating bit through an aperture of the first metal sheet and onto a surface of the second metal sheet to form a volume of heated metal from the second metal sheet
Implementation Method 2
flowing the heated metal from the second metal sheet along the translating and rotating bit, back through the aperture of the first metal sheet
Data Source
AI summary
A system for forming a vehicle component includes a first metal sheet having an aperture, a second metal sheet contacting a lower surface of the first metal sheet, an anvil supporting the first and second metal sheets beneath the aperture, and a press bit disposed above the aperture.