Electron Beam Powder Bed Restart After Scattering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In additive manufacturing, the scattering of powder material during electron beam irradiation disrupts the manufacturing process, leading to inefficiencies and potential device malfunctions due to the need to restart operations in suboptimal heating conditions.
Innovation Solution
An additive manufacturing device and method that includes a detection unit to identify powder scattering, followed by heating the irradiation region using heaters before resupplying powder, ensuring a high-temperature state for efficient melting and reducing recurrence of scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam irradiation is performed in the same heating circumstances after powder scattering, then manufacturing can be restarted, but the powder material may scatter again
Solution Approach 1:
The patent applies preliminary action by heating the irradiation region to a high temperature state before resupplying powder material and restarting beam irradiation. This pre-heating prevents powder scattering from occurring in the first place, rather than responding after scattering happens. The heating unit activates before powder resupply to ensure the region is already at optimal temperature when new powder arrives, eliminating the need to wait for cooling and reheating cycles.
Solution Approach 2:
The patent changes the temperature parameter of the irradiation region by maintaining it in a high-temperature state through continuous or pre-active heating. This parameter change ensures that when powder material is supplied and irradiated, the thermal conditions are optimal for preventing scattering. The heating unit adjusts the temperature parameter dynamically to match the requirements of different manufacturing stages.
2Manufacturing precision
If work is halted when powder scattering occurs, then scattering can be addressed, but manufacturing cannot proceed smoothly
Solution Approach 1:
The patent implements feedback by detecting powder scattering events and automatically responding by activating the heating unit. The system monitors the manufacturing process, identifies when scattering occurs through detection units, and triggers appropriate corrective action (heating the irradiation region). This closed-loop feedback enables the system to self-correct without complete work interruption, maintaining both precision and productivity.
Solution Approach 2:
The patent maintains continuity of useful action by keeping the heating unit active or pre-active during powder scattering events and resupply operations. Rather than completely stopping the manufacturing process, the heating continues uninterrupted, and the beam irradiation can be quickly restarted once new powder is supplied to the pre-heated region. This eliminates idle time and maintains continuous productive action.
3Loss of time
If powder material is supplied to a non-heated irradiation region, then resupply can occur quickly, but heat escapes and scattering is more likely
Solution Approach 1:
The patent applies preliminary action by heating the irradiation region before powder material is supplied. The heating unit activates in advance to ensure the region reaches optimal temperature before new powder arrives. This preliminary heating prevents the scenario where cold powder is supplied to a cool region, which would cause heat escape and increase scattering risk. The timing is arranged so heating precedes or coincides with powder resupply, not after.
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 prevents powder material scattering during manufacturing, allowing for smoother and more efficient production by maintaining a high-temperature state, thereby reducing device malfunctions and improving manufacturing speed.
Implementation Method 1
a heating unit for heating the irradiation region
Implementation Method 2
irradiating the powder material with an electron beam, and melting the powder material
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An additive manufacturing device performs manufacturing of an additively manufactured article by supplying a powder material to an irradiation region of an electron beam, laying and leveling the powder material, irradiating the powder material with the electron beam, and melting the powder material. The additive manufacturing device determines whether or not the powder material has scattered during manufacturing of the article. When it is determined that the powder material has scattered, an irradiation region R is heated by a heater before a new powder material is supplied to the irradiation region R. Manufacturing of the article is restarted after the new powder material has been supplied to the heated irradiation region.