Foil-Based Additive Manufacturing Without Powder Handling
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Solution Overview
Problem
Existing additive manufacturing methods using powdered build materials face challenges such as difficulty in storage and transportation, health risks due to inhalation hazards, and flammability, necessitating the development of non-powder-based methods.
Innovation Solution
The use of foil-based build materials, where a continuous sheet of metal foil is irradiated and fused onto a build plate using a radiation source, eliminating the need for powder handling and allowing for independent movement of the build unit in three dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If powdered build material is used in additive manufacturing, then the material can be selectively deposited layer by layer, but the powder is difficult to store and transport, poses inhalation health risks, and may become flammable
Solution Approach 1:
The invention changes the physical state of the build material from loose powder to consolidated foil form. This parameter change eliminates inhalation hazards and flammability risks associated with loose powder, while maintaining the ability to selectively deposit material through controlled irradiation of the foil
Solution Approach 2:
The foil-based material system replaces expensive and complex powder handling infrastructure with simpler, disposable foil rolls. The foil can be easily replaced when consumed, eliminating the need for expensive powder isolation equipment, filtration systems, and specialized storage facilities
2Adaptability or versatility
If a fixed powder bed system is used, then powder can be spread evenly over the build area, but the system cannot operate in various orientations or in zero gravity
Solution Approach 1:
The invention transitions from a static powder bed system to a dynamic foil-based system where the foil can be fed and positioned from any direction. The foil delivery mechanism can adapt to various gravitational environments and orientations, allowing the build unit to operate upside down, sideways, or in zero gravity without requiring gravitational-dependent powder spreading
Solution Approach 2:
The invention adds dimensional flexibility by allowing the foil to be fed from multiple directions (top, bottom, sides) rather than being constrained to a single horizontal powder bed plane. This enables the build system to operate in various orientations by simply changing the foil feed direction, eliminating gravitational constraints
3Productivity
If conventional powder-based additive manufacturing is used, then components can be built layer by layer, but powder handling and post-processing are required
Solution Approach 1:
The invention extracts and eliminates the powder handling steps from the additive manufacturing process. By using foil-based material that is fed directly to the build area and irradiated in place, the system removes the time-consuming steps of powder spreading, leveling, and post-build powder removal, significantly reducing total build time
Solution Approach 2:
The foil material is pre-formed into ready-to-use rolls that can be directly fed to the build area, eliminating the need for post-build powder removal and cleanup. The material is prepared in advance in a consolidated form that requires no additional handling or processing steps after deposition
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 efficient additive manufacturing without powder handling, reduces health risks, and allows for operation in various orientations, including upside down or in zero gravity, while providing real-time inspection and improved metallurgical characteristics.
Implementation Method 1
uses electromagnetic radiation such as a laser beam, to melt or sinter a powdered material
Implementation Method 2
The energy beam 170 sinters or melts a cross sectional layer of the object being built
Implementation Method 3
to melt or sinter a powdered material, creating a solid three-dimensional object
Implementation Method 4
The powder to be melted by the energy beam is supplied by reservoir 156 and spread evenly over a powder bed 142
Data Source
AI summary
The present disclosure generally relates to methods and apparatuses for additive manufacturing using foil-based build materials. Such methods and apparatuses eliminate several drawbacks of conventional powder-based methods, including powder handling, recoater jams, and health risks. In addition, the present disclosure provides methods and apparatuses for compensation of in-process warping of build plates and foil-based build materials, in-process monitoring, and closed loop control.