Solid-State Aluminum Alloy Parts for Complex Thick Geometries
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Solution Overview
Problem
Conventional metal forging and extrusion processes for aluminum lithium and copper alloys are costly and time-consuming, particularly for producing thick, complex parts, due to the need for expensive tooling and limitations in material properties such as strength and corrosion resistance.
Innovation Solution
Solid-state additive manufacturing (SSA) processes that deposit aluminum lithium or copper alloys in a solid state onto a substrate, using a rotating tool at controlled temperatures to create parts with high percentages of equiaxed grains and minimal void space, eliminating the need for dedicated tooling and allowing for complex geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional forging or extrusion processes are used to produce aluminum lithium or copper alloy parts, then the parts can achieve certain mechanical properties, but the production cost increases and lead time extends due to expensive tooling requirements
Solution Approach 1:
The patent changes the fundamental process parameters by transitioning from conventional forging/extrusion to friction stir additive manufacturing. This involves controlling temperature parameters (maintaining material in solid state below melting point), pressure parameters (applying controlled pressure during deposition), and speed parameters (rotational speed of friction stir tool) to achieve equiaxed grain structure and minimal void space, thereby producing parts with mechanical properties comparable to or exceeding traditional methods while eliminating expensive tooling
Solution Approach 2:
The patent utilizes phase transition concepts by maintaining the aluminum alloy material in a solid state throughout the manufacturing process, avoiding complete melting. The friction stir process creates localized thermal zones that facilitate material softening and flow without reaching full melting point, then allows controlled solidification to form the desired equiaxed grain structure, achieving superior microstructure without the thermal cycles of conventional casting
2Shape
If conventional forging or extrusion processes are used to produce thick and complex aluminum alloy parts, then the parts can be manufactured, but the complexity of tooling increases and production time extends
Solution Approach 1:
The patent applies preliminary action by using computational modeling and simulation before actual manufacturing to optimize the friction stir additive process parameters, tool path planning, and layer deposition sequences. This pre-planning enables direct manufacturing of complex geometries without iterative tooling development, significantly reducing production time while maintaining geometric fidelity and mechanical properties
Solution Approach 2:
The patent transitions from conventional 2D/3D forging or extrusion to true 3D additive manufacturing, enabling complex geometries that cannot be achieved with traditional processes. The friction stir additive method builds parts layer-by-layer in the vertical dimension, allowing internal cavities, varying cross-sections, and complex surface features to be directly manufactured without expensive multi-axis tooling
3Stability of the object's composition
If conventional processes are used to produce aluminum alloy parts, then the material structure can be controlled, but the grain structure uniformity decreases and void space increases
Solution Approach 1:
The patent employs mechanical vibration through the rotational friction stir tool that creates dynamic mixing and stirring action during material deposition. The high-speed rotation (typically 500-2000 RPM) generates intense shear forces that break up developing grain structures and promote uniform equiaxed grain formation while simultaneously expelling trapped gases and voids, achieving dense, void-free material with consistent grain morphology throughout the part
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 produces aluminum alloy parts with properties similar to or exceeding those of forged or extruded products, while reducing material costs and lead times, enabling the creation of high-strength, corrosion-resistant parts without the expense and complexity of traditional forging processes.
Implementation Method 1
Solid-state additive manufacturing (SSA) processes that deposit aluminum lithium or copper alloys in a solid state onto a substrate, using a rotating tool at controlled temperatures
Implementation Method 2
adding an aluminum alloy is added in a solid state as a first aluminum alloy layer to the surface of the substrate at a first tool temperature between 330 degrees Celsius to 560 degrees Celsius
Data Source
AI summary
Solid-state additive manufactured aluminum lithium alloy products and aluminum copper alloy products and methods of producing them are described. Various parts including aluminum lithium alloy products and aluminum copper alloys products are described.