Superplastic Forming Coating Thickness for Wrinkle Control
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Solution Overview
Problem
Conventional methods for mitigating wrinkles in super-plastically formed parts are inefficient and costly, as they require complex die modifications that are difficult to implement and often result in unsuitable parts due to wrinkles.
Innovation Solution
A method involving the application of a friction-modifying layer with non-uniform thicknesses to specific portions of the part assembly, combined with controlled stress management through flanges and surface irregularities, to ensure a uniform stress state during super-plastic formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard features are incorporated into the die geometry to mitigate wrinkles, then wrinkle mitigation is improved, but device complexity and manufacturing cost increase substantially
Solution Approach 1:
A friction-modifying layer is introduced as an intermediary between the die and the part assembly. This layer, applied to the die surface at wrinkle-prone locations, controls friction to prevent wrinkle formation without requiring complex die geometry modifications. The layer acts as a mediator that simplifies the die design while achieving the same wrinkle mitigation effect.
Solution Approach 2:
The friction-modifying layer is applied selectively only to specific regions of the die where wrinkles are predicted to form, rather than modifying the entire die geometry. This localized approach reduces device complexity and manufacturing cost while maintaining effective wrinkle mitigation at critical locations.
2Reliability
If hard features are incorporated into the die geometry to mitigate wrinkles, then wrinkle mitigation is improved, but ease of manufacture deteriorates due to difficult implementation and multiple adjustments
Solution Approach 1:
The friction-modifying layer serves as a removable intermediary that simplifies manufacturing. Instead of permanently modifying die geometry through complex machining or additive processes, the layer can be applied and removed easily, making the manufacturing process simpler and more adaptable.
Solution Approach 2:
The invention changes the friction parameter at the die-part interface by applying a friction-modifying layer, rather than changing the geometric parameters of the die. This parameter change approach is easier to implement and adjust during manufacturing compared to modifying die geometry.
3Reliability
If conventional die modifications are used to mitigate wrinkles, then wrinkle mitigation is improved, but loss of time increases due to multiple adjustments required
Solution Approach 1:
Wrinkle-prone locations are identified through simulation before the actual forming process, and friction-modifying layers are pre-applied to these locations. This preliminary action eliminates the need for multiple trial-and-error adjustments during production, reducing manufacturing cycle time while maintaining effective wrinkle mitigation.
Solution Approach 2:
Simulation results provide feedback on wrinkle-prone locations, which guides the selective application of friction-modifying layers. This feedback loop enables precise targeting of treatment areas, reducing the need for broad, time-consuming die modifications and multiple adjustments.
4Manufacturing precision
If friction-modifying layer with non-uniform thickness is applied to control stress, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The friction-modifying layer is applied with non-uniform thickness specifically at wrinkle-prone locations rather than uniformly across the entire die surface. This localized variation in layer thickness provides precise stress control where needed without complicating the overall application process excessively.
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 approach effectively reduces or eliminates wrinkles, producing wrinkle-mitigated parts by managing stress uniformly across the assembly, thereby enhancing the manufacturing process efficiency and quality.
Implementation Method 1
applying a friction-modifying layer to the first outer sheet of the part assembly... controlling a state of stress within the part assembly during the super-plastic forming process
Implementation Method 2
super-plastically forming the part assembly into the formed part... moving an upper die of the die system in a forming direction toward the lower die to stretch and compress the part assembly
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A method (200) of mitigating wrinkles during a manufacture of a super-plastically formed part, the method (200) comprising: arranging (202) a plurality of flat sheets (104) into a part assembly (106), the plurality of flat sheets (104) comprising a first outer sheet (108) and a second outer sheet (110); applying (204) a friction-modifying layer (120) to the first outer sheet (108) of the part assembly (106), wherein: the first outer sheet (108) comprises a first portion (116) having a first percentage of coverage and a second portion (118) having a second percentage of coverage; the friction-modifying layer (120) is applied at a first thickness (122) in the first portion (116) and a second thickness (124) in the second portion (118); and the first thickness (122) and the second thickness (124) are different thicknesses; placing (206) the part assembly (106) on a lower die (134) of a die system (130) such that the first outer sheet (108) is facing the lower die (134); and moving an upper die (132) of the die system (130) in a forming direction (136) toward the lower die (134) to stretch and compress the part assembly (106) between the upper die (132) and the lower die (134) and to super-plastically form the part assembly (106) into a formed part (102).