Textured Sloped Die Assembly for Low-Torque Friction Stir Extrusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional friction stir extrusion methods require high force and torque, which can disrupt the microstructure of metal materials and degrade their mechanical properties, necessitating the development of efficient tooling and methods to reduce torque and enhance structural soundness of extruded parts.
Innovation Solution
Die assemblies for friction stir extrusion systems featuring a sloped surface with a textured surface, designed to reduce torque requirements and improve microstructural properties, including configurations for forward and backward extrusion systems with specific geometries and thermal management features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional friction stir extrusion methods are used to generate frictional heat, then the feedstock material is softened for extrusion, but large torque and force are required which disrupt the microstructure and degrade mechanical properties
Solution Approach 1:
The patent changes the geometric parameters of the die assembly, specifically incorporating a sloped surface with a specific angle range (5-45 degrees) and textured surface characteristics, to optimize the friction stir extrusion process. This modifies the physical parameters of the system to achieve better heat generation with reduced torque requirements
Solution Approach 2:
The patent applies localized texturing to specific portions of the die surface rather than the entire surface. The textured surface is applied to the sloped portion of the die assembly to create localized friction zones that generate heat where needed, while maintaining smoother surfaces in other areas to reduce overall torque requirements
2Ease of manufacture
If large torque is applied to soften feedstock material, then extrusion is achieved, but the microstructure of the material is disrupted
Solution Approach 1:
The patent introduces a dynamic element through the sloped surface geometry that allows the die assembly to adapt to the material flow during extrusion. The sloped surface creates a progressive deformation zone that dynamically adjusts the stress distribution on the material, reducing microstructural disruption while maintaining extrusion capability
Solution Approach 2:
The sloped surface introduces a curved geometric feature into the otherwise linear extrusion path. This curvature creates a more gradual material flow path and distributes shear stresses more evenly, preventing microstructural disruption while achieving the necessary material softening for extrusion
3Device complexity
If conventional die design is used, then simple geometry is maintained, but high force and torque are required leading to material degradation
Solution Approach 1:
The die assembly is segmented into distinct functional zones: a sloped portion with textured surface for heat generation and material softening, and a cylindrical portion for maintaining structural integrity. This segmentation allows each zone to perform its specific function efficiently, reducing the overall force and torque requirements compared to a conventional uniform die design
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
The die assemblies effectively reduce the necessary torque during the extrusion process, enhancing the mechanical properties and structural integrity of the extruded metal parts by optimizing metal flow and heat generation.
Implementation Method 1
require large amounts of force and torque to generate the requisite frictional heat to soften the feedstock material
Data Source
AI summary
Disclosed herein are devices and methods related to friction stir extrusion. In particular, the present disclosure relates to die assemblies configured for use in a forward friction stir extrusion system and die assemblies configured for use in a backward friction stir extrusion system. The die assemblies in the forward and backward friction stir extrusion systems can include a die piece comprising a sloped surface, wherein at least a portion of the sloped surface is a textured surface.