Shear-Assisted Extrusion for High-Strength Conductive Metal Billets
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Solution Overview
Problem
Existing metal extrusion techniques face challenges in achieving high electrical conductivity and mechanical properties in alloys and composites, often requiring additional additives that can compromise electrical performance.
Innovation Solution
The shear-assisted extrusion process combines rotational and axial forces to plasticize metal billets, allowing for the extrusion of materials with improved strength, electrical conductivity, and corrosion resistance without the need for preheating or external heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal extrusion techniques are used to improve mechanical properties, then strength can be enhanced, but electrical conductivity deteriorates due to the need for additional additives
Solution Approach 1:
The patent changes the fundamental parameters of the extrusion process by applying rotational shear force combined with axial compression, rather than using traditional uniaxial compression. This parameter change enables plasticization and grain refinement without requiring additional alloying elements, thus improving mechanical properties while preserving electrical conductivity
Solution Approach 2:
The patent replaces the traditional thermal-mechanical processing system with a mechanical-shear system. By using rotational shear force to plasticize the metal billet, the process eliminates the need for heating and additive elements, resolving the contradiction between strength enhancement and electrical conductivity maintenance
2Strength
If traditional extrusion processes are used to achieve high mechanical properties, then strength improves, but energy consumption increases due to preheating and external heating requirements
Solution Approach 1:
The patent implements self-service plasticization where the metal billet plasticizes itself through the application of rotational shear force and axial compression. The mechanical energy from the shear-assisted extrusion process directly causes plastic deformation and grain refinement without requiring external heating, thereby reducing energy consumption while achieving high mechanical properties
Solution Approach 2:
The patent substitutes thermal energy with mechanical shear energy for plasticization. By using rotational shear force to achieve material plasticization and grain refinement, the process eliminates preheating and external heating steps, significantly reducing energy consumption while maintaining or improving mechanical properties
3Reliability
If conventional extrusion methods are used to improve material density, then porosity can be reduced, but process complexity increases due to additional heating equipment and control systems
Solution Approach 1:
The patent replaces complex thermal processing equipment and control systems with a simpler mechanical shear-assisted extrusion system. By using rotational shear force combined with axial compression to plasticize and densify the metal billet, the process achieves reduced porosity and improved material density without requiring heating equipment, temperature control systems, or associated complexity
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 process enables the production of extrudates with enhanced mechanical and electrical properties, reduced porosity, and lower energy consumption, making it suitable for various industrial applications.
Implementation Method 1
establishing a rotational shearing force and an axial extrusion force at an interface where a face of a die tool engages with a face of a portion of a billet or other feedstock material
Implementation Method 2
The heating generated by the extrusion process itself, and resulting plasticization
Implementation Method 3
establishing a rotational shearing force and an axial extrusion force at an interface where a face of a die tool engages with a face of a portion of a billet or other feedstock material
Data Source
AI summary
A shear-assisted extrusion process and related apparatus can include establishing a rotational shearing force and an axial extrusion force at an interface where a face of a die tool engages with a face of a portion of billet or other feedstock material, and extruding the portion of feedstock material through an opening of the die tool in response to establishing the rotational shearing force and the axial extrusion force. The die tool can be rotated at a different rate than the feedstock material prior to extrusion of the feedstock material through the opening of the die tool. A number of configurations can be used to provide the rotational shearing force and/or the axial extrusion force, as described herein.