Movable Gas Knife System for Large-Area Additive Manufacturing
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Solution Overview
Problem
Conventional stationary air knife systems are less effective in removing deposition products such as oxidized particles and vaporized metal from large build plates in metal additive manufacturing, leading to defects in the final parts.
Innovation Solution
A moveable gas knife system with sliding inlet and outlet manifolds, a recirculation system, and a control module to position the manifolds relative to the melt pool, ensuring efficient collection of spatter and deposition products across the entire build area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary air knife system is used, then the system structure is simple, but the effectiveness of removing deposition products decreases with increasing build plate size
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary air knife system into a movable one. The air knife assembly can move along the build plate to follow the melt pool position, ensuring effective deposition product removal across the entire build area regardless of size. This dynamic positioning capability resolves the contradiction by maintaining removal effectiveness while accommodating larger build plates.
Solution Approach 2:
The system uses feedback control where the position of the melt pool is monitored and used to control the position of the air knife. The control module receives position information and adjusts the air knife location accordingly, ensuring the air knife remains positioned to effectively remove deposition products from the melt pool area even as the build plate size increases.
2Productivity
If the build plate size is increased for cost effective production, then the productivity improves, but the stationary air knife becomes less effective at removing deposition products
Solution Approach 1:
By making the air knife movable and capable of tracking the melt pool position, the system maintains high removal effectiveness across larger build plates. This enables increased productivity through larger build areas while preserving the reliability of deposition product removal, resolving the contradiction between productivity and reliability.
3Reliability
If a moveable gas knife system is implemented, then the deposition product removal effectiveness improves, but the device complexity increases
Solution Approach 1:
The moveable air knife system incorporates dynamic positioning capabilities with motors, controllers, and position sensors to track the melt pool. While this increases device complexity, it significantly improves deposition product removal effectiveness by ensuring the air knife is always positioned optimally relative to the melt pool, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The feedback control system continuously monitors melt pool position and adjusts air knife positioning accordingly. This closed-loop control ensures optimal removal effectiveness while automating the complexity management, as the control module handles the coordinated movement and positioning without requiring complex manual intervention.
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 enhances the quality of the build by reducing defects and allows for larger build areas to be utilized efficiently, improving cost-effectiveness and capability.
Implementation Method 1
A moveable gas knife system with sliding inlet and outlet manifolds... ensuring efficient collection of spatter and deposition products
Data Source
Figure 1
Figure 2
AI summary
A gas knife system (100) for an additive manufacturing system can include one or more gas delivery members configured to move relative to a build area of the additive manufacturing system, and an inlet conduit (109a) configured to supply gas to the one or more gas delivery members while the one or more gas delivery members are moved relative to the build area. The system can also include one or more gas collection members configured to move relative to the build area of the additive manufacturing system, and an outlet conduit (109b) configured collect gas from the one or more gas collection members while the one or more gas collection members move relative to the build area.