Shear-Assisted Extrusion for Graded Properties Along Billet Length
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Solution Overview
Problem
Current metal extrusion techniques find it challenging to fabricate components with varying mechanical properties along a length, such as high strength in one portion and high ductility in another, without requiring expensive secondary processing steps or complicating the geometry.
Innovation Solution
The Shear Assisted Processing and Extrusion (ShAPE) technique involves rotating the die face relative to the billet during extrusion, allowing for controlled plastic deformation and varying properties along the extruded product length by adjusting rotation speed and axial force, enabling the production of aluminum profiles with graded properties and shapes without secondary processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional extrusion techniques are used to produce uniform extrudates, then the manufacturing process is simple and cost-effective, but the mechanical properties remain uniform along the length and cannot be tailored
Solution Approach 1:
The die face is rotated during extrusion at controlled speeds, transforming the static extrusion process into a dynamic one. This rotation creates variable shear rates along the extrudate length, enabling tailored mechanical properties without complex equipment modifications. The rotation speed can be adjusted to control the degree of property variation along the extrudate.
Solution Approach 2:
The invention changes the extrusion parameters by introducing rotational motion of the die face, which varies the shear rate parameter along the extrusion direction. This parameter change enables control over microstructure development and resulting mechanical properties at different positions along the extrudate length, achieving property tailoring through parameter variation rather than equipment complexity.
2Adaptability or versatility
If secondary processing steps are added to create varying mechanical properties, then the mechanical property tailoring is achieved, but the production time and cost increase
Solution Approach 1:
The invention merges the property tailoring function into the primary extrusion process itself by rotating the die face during extrusion. This integration eliminates the need for separate secondary processing steps such as selective heat treatment or mechanical working, thereby maintaining high production speeds while achieving the desired mechanical property variation along the extrudate length.
Solution Approach 2:
The mechanical property tailoring is performed preliminarily during the extrusion process itself rather than as a subsequent operation. By controlling the die face rotation during extrusion, the desired microstructure and mechanical properties are established in the initial forming stage, eliminating the need for later intervention and maintaining production efficiency.
3Manufacturing precision
If the die face is rotated during extrusion, then variable mechanical properties are achieved along the extrudate, but the process complexity increases
Solution Approach 1:
The die face rotation introduces a dynamic element to the extrusion process, enabling precise control over the shear rate history experienced by the material at different positions. This dynamic control achieves superior manufacturing precision in terms of microstructure and property tailoring while adding only moderate equipment complexity through the rotation mechanism.
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 achieves a 15% difference in tensile strength and ductility variations along the extruded length, facilitating the fabrication of components with tailored mechanical properties without the need for additional processing steps, enhancing the reproducibility and applicability of metal extrusion in industries like automotive and aerospace.
Implementation Method 1
rotating the die face relative to the billet during extrusion, allowing for controlled plastic deformation
Implementation Method 2
controlled plastic deformation and varying properties along the extruded product length
Implementation Method 3
applying an axial force to push the feedstock material through the die opening
Data Source
AI summary
A method for shear-assisted extrusion of a billet or feedstock can involve extruding a first portion of the feedstock through a die opening while rotating the die face relative to the feedstock at a first rotational rate and applying a first axial extrusion force. A second portion of the feedstock can be extruded through the opening while rotating the die face at a second rotational rate and applying a second axial extrusion force. This can establish different temperature ranges at the interface for each portion, resulting in a first extruded portion with different physical properties than the second extruded portion.