Scroll-Die Shear Extrusion for Low-Energy Billet Plasticization
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Solution Overview
Problem
Current manufacturing methods for producing materials like magnesium and aluminum alloys are inefficient, costly, and struggle with forming hollow parts with equal or greater strength than solid parts, due to lack of suitable processes, high energy costs, and issues like brittle intermetallic layer formation during joining, as well as the expense and rarity of rare earth metals.
Innovation Solution
The Shear Assisted Processing and Extrusion (ShAPE) technique applies a rotational shearing force and axial extrusion simultaneously using a die tool with a scroll face to direct plasticized material, allowing for the production of high-quality extrusions with improved strength, corrosion resistance, and reduced energy consumption, eliminating the need for pre-heating and external heating, and enabling the use of non-rare earth magnesium alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional extrusion processes are used to produce magnesium or aluminum alloys, then manufacturing capability is achieved, but energy consumption is high and production costs are elevated
Solution Approach 1:
The patent replaces conventional thermal-based extrusion processes with a mechanical shear-based system. A rotating scroll applies severe shear deformation to the material, generating heat through mechanical work rather than external heating. This substitution of thermal energy with mechanical energy for material plasticization directly reduces energy consumption while maintaining manufacturing capability
Solution Approach 2:
The patent fundamentally changes the extrusion parameters by operating at room temperature or near-room temperature conditions instead of high temperatures. The rotating scroll speed, shear rate, and applied pressure are optimized to achieve material flow and plasticization without thermal softening, thereby reducing energy input requirements while preserving formability
2Ease of manufacture
If pre-heating and external heating are applied to enable extrusion, then material formability is improved, but energy consumption increases
Solution Approach 1:
The system generates its own heat through the mechanical shear deformation process. The rotating scroll imparts severe shear strain to the material, and the mechanical work is converted to heat within the material itself through internal friction and plastic deformation. This self-heating mechanism eliminates the need for external heating systems while maintaining material formability through in-situ thermal softening
Solution Approach 2:
The rotating scroll applies periodic shear deformation to the material as it rotates. This cyclic loading and unloading creates repeated plastic deformation events that accumulate strain and generate heat over time. The periodic nature of the shear action enables progressive material softening and flow without requiring continuous external heating input
3Strength
If conventional joining processes are used to join dissimilar materials, then structural integrity is achieved, but brittle intermetallic layers form
Solution Approach 1:
The patent changes the joining parameters by using solid-state shear deformation instead of melting and solidification processes. The rotating scroll applies severe shear strain to the dissimilar material interface, creating a mechanically mixed zone with refined microstructure. This parameter change avoids the formation of brittle intermetallic compounds that typically form during conventional welding or brazing of dissimilar metals
Solution Approach 2:
The patent replaces thermal-based joining methods (welding, brazing, soldering) with a mechanical shear-based joining process. The rotating scroll imposes severe shear deformation on the material interface, creating a mechanically bonded joint through interlocking and diffusion bonding at the micro-scale. This mechanical approach avoids the high-temperature thermal cycles that cause harmful intermetallic layer formation
4Strength
If rare earth metals are added to alloys to impart desired characteristics, then material properties are improved, but production costs increase due to expense and rarity
Solution Approach 1:
The patent changes the material composition parameters by eliminating or minimizing rare earth metal additions. Instead, the desired material properties are achieved through severe shear deformation processing that refines the microstructure, creates fine-grained structures, and develops favorable texture. The processing parameters (scroll speed, shear rate, pressure) are optimized to produce high-strength materials without relying on expensive rare earth alloying elements
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
ShAPE achieves significant reductions in energy consumption and production costs, enabling the creation of lightweight magnesium components with enhanced mechanical properties, improved ductility, and corrosion resistance, while allowing for the direct extrusion of materials from billets, powders, or flakes in a single step, and effectively joining dissimilar materials without forming brittle intermetallic layers.
Implementation Method 1
applying a rotational shearing force and an axial extrusion force to the same preselected location on material
Implementation Method 2
eliminates the need for pre-heating and external heating
Implementation Method 3
applying a rotational shearing force and an axial extrusion force to the same preselected location on material
Data Source
AI summary
The present disclosure provides methods for preparing an extruded product from a solid billet. The methods can include providing an as-cast billet for extrusion; applying a simultaneous rotational shear and axial extrusion force to the as-cast billet to plasticize the as-cast billet; and extruding the plasticized as-cast billet with an extrusion die to form an extruded product. Methods for preparing extruded products from billets can also include: providing a billet for extrusion; while maintaining a majority of the billet below 100° C., applying a simultaneous rotational shear and axial extrusion force to one end of the billet to plasticize the one end of the billet; and extruding the plasticized one end of the billet with an extrusion die to form an extruded product. Methods for preparing an extruded product from a billet can also include providing a billet for extrusion; applying a simultaneous rotational shear and axial extrusion force to the billet to plasticize the billet; extruding the plasticized billet with an extrusion die to form an extruded product; and artificially aging the extruded product for less than the ASTM recommended amount of time.