Uniform Powder Bed Formation in Depressurized Additive Manufacturing
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Solution Overview
Problem
Conventional additive manufacturing methods face issues with forming a uniform powder bed when the chamber is depressurized and a stage is preheated, leading to irregular or incomplete powder beds.
Innovation Solution
The method involves reducing the chamber pressure to between 8000 Pa and 30,000 Pa, preheating the stage, and supplying an inert gas to form a uniform powder bed, using a controlled additive manufacturing apparatus with precise pressure and temperature management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the chamber is depressurized and the stage is preheated to form a powder bed, then material oxidation is reduced and manufacturing precision is improved, but the powder bed becomes irregular or cannot be formed uniformly
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chamber pressure within the range of 8000 Pa to 30000 Pa during powder bed formation. This specific pressure range, combined with stage preheating and inert gas supply, resolves the contradiction by creating optimal conditions for uniform powder bed formation while preventing oxidation. The controlled pressure parameter ensures both manufacturing precision and formation stability.
Solution Approach 2:
The patent uses an inert gas atmosphere during powder bed formation to prevent material oxidation while maintaining stable and uniform powder bed formation. The inert gas environment eliminates harmful oxidation reactions that would otherwise occur during preheating, thereby simultaneously improving manufacturing precision and ensuring reliable powder bed formation.
2Manufacturing precision
If the chamber pressure is reduced to prevent oxidation, then material quality is improved, but powder bed formation becomes difficult or irregular
Solution Approach 1:
The patent changes the pressure parameter from complete vacuum to a controlled range of 8000 Pa to 30000 Pa, which maintains sufficient inert atmosphere to prevent oxidation while being gentle enough to allow easy and uniform powder bed formation. This optimized pressure range simultaneously achieves high material quality and ease of manufacture.
Solution Approach 2:
The patent applies preliminary action by preheating the stage before powder bed formation and supplying inert gas in advance. This preliminary preparation ensures that when powder is deposited, the environment is already optimized for both oxidation prevention and uniform formation, making the manufacturing process easier while maintaining high quality.
3Object-affected harmful factors
If inert gas is supplied and stage is preheated simultaneously, then oxidation is suppressed, but energy loss increases and process complexity increases
Solution Approach 1:
The patent optimizes the chamber pressure parameter to 8000-30000 Pa, which reduces the amount of inert gas needed to maintain the atmosphere compared to higher pressure systems. This parameter optimization suppresses oxidation while minimizing energy loss associated with gas supply and heating, making the process more energy-efficient.
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 ensures a uniform powder bed formation, reducing oxygen content and suppressing material oxidation, preventing cracking, and enhancing the quality of the manufactured object by minimizing energy loss and vapor discharge.
Implementation Method 1
emitting a laser beam onto the powder bed to manufacture a shaped object by fusion
Implementation Method 2
reducing a pressure inside the chamber to a pressure equal to or higher than 8000 [Pa] and equal to or lower than 30,000 [Pa]
Implementation Method 3
forming the powder bed on the stage while preheating the stage and supplying an inert gas
Data Source
AI summary
The present disclosure provides an additive manufacturing method by which a uniform powder bed can be formed even when the interior of a chamber is depressurized and a powder bed is formed on a stage as the stage is preheated and an inert gas is supplied. An additive manufacturing method for a shaped object S includes forming a powder bed PB on a stage 51 in a chamber 10, and fusing the powder bed PB by laser emission. According to this additive manufacturing method, a pressure in the chamber 10 is reduced to a pressure equal to or higher than 8000 [Pa] and equal to or lower than 30,000 [Pa], and the powder bed PB is formed on the stage 51 as the stage 51 is preheated and an inert gas is supplied.