Movable Protective Gas Unit for Additive Manufacturing
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Solution Overview
Problem
Existing additive manufacturing technologies face challenges in achieving precise, local selective action on powder materials, leading to unwanted powder removal and quality issues due to oxidation reactions and process by-products during the production of three-dimensional products.
Innovation Solution
A device and method utilizing a movable protective gas unit and a radiation source for locally selective action on powder, with a closed process chamber and inert gas flow to prevent oxidation and remove by-products, ensuring precise material formation and maintaining powder adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a protective gas unit is used to prevent oxidation and remove process by-products, then the quality of the three-dimensional product is improved, but powder particles may be undesirably removed from the layer due to gas flow
Solution Approach 1:
The patent introduces a protective gas unit that supplies inert protective gas to the processing area, creating an inert atmosphere that prevents oxidation reactions and removes process by-products from the powder layer, thereby improving product quality while controlling gas flow to minimize powder removal
Solution Approach 2:
The patent optimizes parameters of the protective gas flow including flow velocity, mass flow, and volumetric flow to achieve the desired protective effect without causing undesired powder removal. The gas flow parameters are carefully controlled to balance protection quality with powder layer stability
2Object-generated harmful factors
If high flow velocities and mass flows of protective gas are used to remove process by-products, then the removal of process by-products is improved, but powder particles are removed from the layer
Solution Approach 1:
The patent carefully controls and optimizes the flow parameters (velocity, mass flow, volumetric flow) of the protective gas to achieve effective removal of process by-products while maintaining low enough flow velocities to prevent undesired removal of powder particles from the layer
3Manufacturing precision
If the process chamber is closed off for protective gas atmosphere, then oxidation reactions are suppressed and product quality is improved, but the complexity of the device increases
Solution Approach 1:
The patent implements a closed process chamber that can be filled with protective inert gas to create an oxidation-free environment for additive manufacturing, suppressing harmful chemical reactions and improving product quality despite the increased structural complexity
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 enables efficient, precise additive manufacturing by preventing unwanted powder removal and oxidation, improving the quality of three-dimensional products by maintaining powder adhesion and effectively removing process by-products.
Implementation Method 1
The action device (4) is designed to melt the powder (2) locally and selectively. Preferably the exposure device (4) is a source of radiation from a radiation source such as e.g. B. a laser
Implementation Method 2
The protective gas atmosphere can improve the quality of the three-dimensional product to be manufactured. This is due in particular to the fact that chemical reactions (particularly oxidation reactions) can be suppressed by the protective gas
Implementation Method 3
the individual powder particles of the powder adhere to one another in the layer
Implementation Method 4
it is also preferred if the powder is such that it is held within the layer by its own weight
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Device (1) for the additive production of a three-dimensional product from a powder (2) by locally selective action on the powder (2), wherein the device (1) comprises at least: a process chamber (3) within which the three-dimensional product can be produced, at least one action device (4) for locally selective action on the powder (2), and at least one protective gas unit (5) for providing a protective gas and for locally generating a protective gas flow at a momentary action location (12), wherein the protective gas unit (5) is movably arranged within the process chamber (3).