Functionally Graded Components via Additive Manufacturing and HIP
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Solution Overview
Problem
Current manufacturing processes, both additive and subtractive, face challenges in producing oil and gas components with complex design features and functionally graded properties, particularly in achieving specific properties like hardness and chemical resistance near the surface while providing structural support, which is essential for downhole tools.
Innovation Solution
A hybrid manufacturing method combining additive manufacturing with hot isostatic pressing (HIP) to create monolithic components with functionally graded properties, where an outer shell is printed with specific materials for surface and interior regions, and filled with bulk material for structural support, then subjected to elevated temperature and gas pressure to bond and densify the materials, optimizing strength-to-weight ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If additive manufacturing processes are used to produce components with complex design features, then design complexity and strength-structure optimization are improved, but manufacturing cycle time and cost increase
Solution Approach 1:
The patent applies preliminary action by pre-forming the outer shell with complex geometric features through additive manufacturing before inserting the bulk material. This allows the complex design features to be created in advance during the additive manufacturing process, rather than requiring additional post-processing steps, thereby reducing overall manufacturing cycle time while maintaining design complexity
Solution Approach 2:
The component is segmented into two distinct parts: an outer shell formed by additive manufacturing and a bulk material insert. This segmentation allows each part to be manufactured using the most appropriate process for its specific requirements, with the outer shell providing complex geometry and the bulk material providing structural support, thereby optimizing both design complexity and manufacturing efficiency
2Reliability
If functionally graded properties are produced to accommodate surface hardness and chemical resistance requirements, then material property optimization is improved, but manufacturing difficulty increases for both additive and subtractive processes
Solution Approach 1:
The patent applies local quality by providing different material properties in different regions of the component. The outer shell is manufactured with specific material properties for surface hardness and chemical resistance, while the bulk material insert provides different properties for structural support. This localized differentiation of material properties achieves functional grading without the manufacturing complexity of traditional methods
Solution Approach 2:
The component uses composite construction combining the outer shell material and bulk material insert, where each material is selected for its specific properties. This composite approach enables functionally graded properties throughout the component, with the outer shell providing surface-related properties and the bulk material providing structural properties, achieved through a relatively simple manufacturing process
3Productivity
If bulk manufacturing processes are used to produce components, then manufacturing cost is reduced, but design complexity and lead time are worsened
Solution Approach 1:
The patent merges two manufacturing approaches by combining additive manufacturing for the outer shell with bulk material insertion for the core. This hybrid approach allows the outer shell to incorporate complex design features that would be difficult or impossible to achieve with traditional bulk manufacturing, while the bulk material insert provides cost-effective structural support, thereby achieving both design complexity and cost efficiency
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 enables the production of components with optimized strength-to-weight ratio and improved material properties, effectively addressing the challenges of complex design features and functional grading, reducing energy and material costs by up to 90% and achieving 100% theoretical density, thus enhancing durability and performance.
Implementation Method 1
subjecting the outer shell and the bulk material to an elevated temperature and an elevated gas pressure to thereby bind the bulk material and outer shell to form the monolithic component
Implementation Method 2
bind the bulk material and outer shell to form the monolithic component
Implementation Method 3
subjecting the outer shell and the bulk material to an elevated temperature and an elevated gas pressure
Data Source
AI summary
Methods of manufacturing monolithic components with complex design features and functionally graded properties in any spatial direction may include forming of outer shell with an additive manufacturing process, loading the shell with bulk material and exposing the loaded shell to a hot isostatic pressing (HIP) process. The combination of the additive manufacturing process and the HIP process forms a diffusion bond between the outer shell and the bulk material resulting in a monolithic component with functionally graded properties. The outer shell may include an exterior surface and an inner passage formed with relatively hard surfaces to accommodate fluids in a wellbore.