Continuous Recoater Blade Refresh for Additive Manufacturing
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Solution Overview
Problem
Existing recoater blades in additive manufacturing processes, such as direct metal laser melting, are prone to damage from edges or protrusions in the object being built, leading to costly downtime and material waste due to the need for frequent replacement and potential damage to the part during powder spreading.
Innovation Solution
A recoater arm with a blade portion made of materials like silicone rubber or plastic, equipped with a payout spool for continuous blade material supply and a damage detection system, allowing for real-time replacement of damaged blades without stopping the process and incorporating a takeup spool for used blade collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional rigid recoater blade is used, then the blade can effectively spread powder, but the blade is prone to damage from edges or protrusions in the object being built
Solution Approach 1:
The recoater blade is made from a flexible material such as silicone rubber instead of rigid material. This flexible blade can conform to the surface being coated and will not damage the part when encountering edges or protrusions, while still effectively spreading the powder material across the build platform.
Solution Approach 2:
The blade material properties are changed from rigid to flexible by selecting materials with appropriate durometer values (e.g., 20-80 Shore A). This parameter change allows the blade to maintain its spreading function while becoming resistant to damage from contact with the part being built.
2Object-affected harmful factors
If the recoater blade is replaced frequently to prevent damage, then the part is protected from damage, but the manufacturing process experiences downtime and reduced productivity
Solution Approach 1:
The flexible blade design eliminates the need for frequent replacements, allowing the additive manufacturing process to continue without interruption. The blade's damage resistance ensures continuous operation while maintaining part protection, thus preserving manufacturing productivity.
3Reliability
If a flexible blade material is used, then the blade is resistant to damage from part edges, but the blade may not spread powder as effectively as a rigid blade
Solution Approach 1:
The flexible blade is designed with specific dimensional parameters including thickness (0.5-5mm) and width (10-50mm) to optimize its performance. The flexibility allows the blade to conform to the build platform surface while maintaining sufficient structural integrity to effectively spread powder material in a uniform layer.
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 solution reduces downtime and material waste by enabling continuous operation with a durable recoater blade that can be replaced on the fly, minimizing damage to the part and maintaining process efficiency.
Implementation Method 1
at least part of a layer of powder in a powder bed is irradiated to form an object... an energy beam 136 generated by a source 120, which can be, for example, a laser for producing a laser beam... The energy beam 136 sinters or melts a cross sectional layer of the object being built
Implementation Method 2
spread evenly over a powder bed 112 using a recoater arm 116 travelling in direction 134 to maintain the powder at a level 118... distributing a portion of powder over a build plate by spreading the powder with a recoater arm
Data Source
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AI summary
The present disclosure generally relates to additive manufacturing systems and methods involving a mechanism for feeding in a desired amount of fresh recoater blade. This can be accomplished by, for example, spooling the fresh blade material from a spool. This helps prevent work stoppage when a portion of a recoater blade becomes damaged. As such, the present disclosure also relates to a system and method for detecting whether a recoater blade is damaged, and if there is damage, then causing a fresh blade portion to be fed in.