Friction Stir Deposition Head With Die-Controlled Extrudate Shaping
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Solution Overview
Problem
Friction stir additive manufacturing systems face challenges with uncontrolled material flow leading to excess material formation, resulting in rough surfaces, inaccurate geometries, and defects, which increase production costs and waste.
Innovation Solution
An additive manufacturing system comprising a deposition head with a stirring tool and a die that controls the geometry and dimensions of the extrudate by positioning the die adjacent to the stirring tool to inhibit radial material flow and shape the surface during deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If friction stir tool rapidly rotates to generate heat for material deposition, then material bonding capability is improved, but uncontrolled material flow occurs leading to excess material formation
Solution Approach 1:
A die is introduced as an intermediary component between the friction stir tool and the substrate. The die controls material flow during deposition, preventing excessive radial flow while allowing the friction stir tool to generate necessary heat for bonding. This mediator resolves the contradiction by separating the heat generation function from the material flow control function.
Solution Approach 2:
The deposition system is segmented into distinct functional components: the friction stir tool for heat generation and bonding, and the die for material flow control. This segmentation allows each component to optimize its specific function without interfering with the other, enabling both strong bonding and precise material flow control.
2Productivity
If material is deposited through friction stir process, then additive manufacturing capability is achieved, but surface quality deteriorates due to excess material and rough characteristics
Solution Approach 1:
The die serves as a mediator that shapes the extrudate during deposition, controlling the geometry and surface characteristics of the deposited material. This allows continuous additive manufacturing while achieving smooth surface quality and accurate dimensions without requiring post-processing.
Solution Approach 2:
The die performs preliminary shaping of the material during the deposition process itself, rather than requiring subsequent post-processing operations. The surface geometry is formed correctly during deposition, preventing the need for additional finishing steps.
3Loss of substance
If friction stir deposition is used for solid-state additive manufacturing, then material waste is reduced compared to traditional methods, but defects require discarding objects increasing waste
Solution Approach 1:
The die prevents defects by controlling material flow and preventing excess material formation during deposition. By ensuring proper material distribution and geometry control, the die reduces the occurrence of defects that would otherwise require discarding the entire object, thus maintaining low waste levels while improving reliability.
4Manufacturing precision
If die is positioned adjacent to stirring tool to control material flow, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The die is integrated with the friction stir tool assembly, merging the material flow control function with the existing deposition system. This integration minimizes the increase in device complexity while achieving precise geometry and dimension control of the deposited material.
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 system effectively controls material flow and surface characteristics, improving the quality of the deposited layers and reducing defects, thereby enhancing the precision and efficiency of the additive manufacturing process.
Implementation Method 1
The friction stir tool rapidly rotates and generates heat through dynamic contact friction at a tool-material interface
Implementation Method 2
Heat is generated by dynamic contact friction between the friction stir tool and a material
Implementation Method 3
Heated and softened, the feed material is fed through the friction stir tool and bonds with a substrate through plastic deformation at the interface
Implementation Method 4
Heat is generated by dynamic contact friction between the friction stir tool and a material, dissipated by plastic deformation of the material, and transferred inside the material by thermal conduction
Data Source
AI summary
An additive manufacturing system for depositing an extrudate onto a substrate comprises a deposition head. The deposition head comprises a stirring tool, rotatable about an axis of rotation AR and comprising a tool distal end and a tool proximal end, axially opposing the tool distal end along the axis of rotation AR. The stirring tool defines a bore, extending from the tool proximal end to the tool distal end. The bore is configured to receive feedstock, biased toward the tool distal end. The deposition head also comprises a die, which is positioned adjacent to the stirring tool, defines a die axis AD1, and comprises a die distal end and a die proximal end, axially opposing the die distal end along the die axis AD1. The die axis AD1 is parallel with the axis of rotation AR of the stirring tool.