3D Powder Shell Densification Without Conventional Canning
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Solution Overview
Problem
Current powder metallurgical processing methods for manufacturing complex and high-performance three-dimensional objects are inefficient and costly, particularly in densification processes like HIP and PIF, due to the need for specialized tooling, high material costs, and yield loss from interaction with can materials.
Innovation Solution
A method involving partial densification processing of loose machining powder to form sealed enclosures, followed by overall densification, which eliminates the need for conventional cans by implementing metallurgical bonding between the powder and enclosure, allowing for simultaneous production of multiple parts with reduced energy consumption and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional canning and densification processing is used, then powder materials can be mechanically pressed into porous objects suitable for handling, but the process requires several extra steps and leads to higher yield loss due to interaction between materials and can material
Solution Approach 1:
The invention extracts and eliminates the can from the conventional canning and densification process. By using a mold cavity instead of a can, the harmful interaction between powder material and can material is removed, thereby reducing yield loss while maintaining the ability to handle and transfer powder materials effectively.
Solution Approach 2:
The invention introduces a mold cavity as an intermediary structure that replaces the conventional can. This mold cavity serves as the medium for containing and processing powder materials during densification, eliminating the need for can material that causes yield loss while still providing the necessary containment and transfer functionality.
2Ease of manufacture
If additive manufacturing processes like EBM and DMLM are used to produce complex shaped articles, then net or near net shapes can be produced directly without specialized tooling, but the deposition rates are low and manufacturing time increases significantly for large quantities
Solution Approach 1:
The invention segments the manufacturing process into two distinct stages: first, additive manufacturing creates a porous preform with complex geometry; second, a separate densification process consolidates the preform to full density. This segmentation allows the additive process to focus on geometry creation while the densification process handles volume consolidation, thereby improving overall throughput for large quantities.
Solution Approach 2:
The invention performs preliminary additive manufacturing to create a porous preform structure that defines the complex geometry. This preliminary action establishes the shape and internal structure before the final densification step, allowing rapid production of multiple preforms that can then be densified in batch, significantly improving productivity for large quantities.
3Object-affected harmful factors
If canning processing is used to isolate powder materials from the surrounding environment, then materials can be protected during processing, but the cans are oversized versus the final product and require several extra steps
Solution Approach 1:
The invention extracts and removes the can from the processing system, replacing it with a mold cavity that provides environmental protection during densification. This elimination of the can reduces the number of processing steps required, as the mold cavity integrates the containment and processing functions that previously required separate canning and uncanning steps.
Solution Approach 2:
The mold cavity serves multiple functions simultaneously: it contains the powder material, protects it from the environment, and provides the structural framework for densification. This multi-functionality eliminates the need for separate canning steps and reduces overall device complexity while maintaining environmental protection throughout the process.
4Manufacturing precision
If conventional densification processes are used, then powder can be consolidated into dense articles, but the process requires specialized tooling and high material costs
Solution Approach 1:
The invention merges the mold cavity with the densification process itself. The mold cavity serves as both the containment structure and the densification tooling, eliminating the need for specialized separate tooling. This integration maintains full density consolidation while significantly reducing tooling complexity and material costs.
Solution Approach 2:
The mold cavity is designed to serve multiple purposes: it contains the powder, defines the final geometry, and provides the reaction chamber for densification. This universal structure eliminates the need for specialized tooling while achieving complete density consolidation, thereby reducing both tooling requirements and manufacturing costs.
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 simplifies the manufacturing process, reduces energy consumption, and decreases costs by enabling the simultaneous production of multiple three-dimensional parts without the use of conventional cans, thereby improving efficiency and reducing material waste.
Implementation Method 1
performing partial densification processing on loose machining powder to form a sealed enclosure
Implementation Method 2
performing overall densification processing on the enclosure and the machining powder inside the enclosure
Data Source
AI summary
A method of manufacturing a three-dimensional target object may include forming a shell from loose machining powder using an additive manufacturing process and subjecting the shell to a densification process to form a target object. The shell may define an enclosure that contains additional machining powder. The densification process may include causing metallurgical bonding between the shell and additional machining powder contained in the enclosure defined by the shell and shrinking and/or distorting the shape of the shell to conform the target object to a three-dimensional model for the target object. The shell may include a plurality of layers and/or parts that differ at least in respect of density. The plurality of layers and/or parts may be configured based at least in part on the shrinking and/or distorting to the shape of the shell needed to conform the target object to the three-dimensional model for the target object.