Multi-Zone Radiation Gun for 3D Printing Stress Reduction
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Solution Overview
Problem
Existing methods for producing three-dimensional products through successive fusion of powder layers face challenges in achieving high manufacturing rates while minimizing surface and internal stresses, which can lead to shape deviations and crack formation due to increased sweep speed and power of the beam.
Innovation Solution
The method involves using a radiation gun to create two or more fusion zones that propagate simultaneously through the selected area, with the focal points of the radiation gun moving at a speed corresponding to the wave propagation speed of the fusion zone, and calculating an energy balance to maintain a defined working temperature, reducing the risk of overheating and stress occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If increased sweep speed and beam power are used to achieve high manufacturing rates, then productivity is improved, but surface stresses and internal stresses increase causing shape deviations and crack formation
Solution Approach 1:
The patent divides the single fusion zone into multiple fusion zones that propagate simultaneously through the powder bed. This segmentation allows the total energy input to be distributed across multiple zones, reducing the stress concentration in any single area while maintaining the overall manufacturing rate. The multiple fusion zones work in parallel to complete the cross-section formation faster than a single zone could, thereby improving productivity without sacrificing shape accuracy.
2Speed
If increased beam power is used to maintain fusion quality at higher sweep speeds, then manufacturing rate is improved, but surface stresses increase leading to shape deviations
Solution Approach 1:
By creating multiple fusion zones that propagate simultaneously, the patent segments the high-power energy input into distributed lower-power zones. Each fusion zone operates at a manageable power level that avoids excessive surface stress, while the collective action of multiple zones maintains the overall processing speed. This allows the sweep speed to be increased without proportionally increasing the power in any single zone, thus preventing surface stress-related shape deviations.
Solution Approach 2:
The patent employs dynamic control of multiple fusion zones propagating through the powder bed. The positions, powers, and propagation speeds of individual fusion zones can be dynamically adjusted based on real-time conditions. This dynamic approach allows optimization of the energy distribution to maintain appropriate heating rates that prevent excessive surface stress while achieving high sweep speeds for improved manufacturing rate.
3Manufacturing precision
If single fusion zone propagation is used to maintain temperature control, then manufacturing precision is maintained, but productivity is limited
Solution Approach 1:
The patent segments the single fusion zone into multiple simultaneous fusion zones, each maintaining appropriate temperature control for quality surface finish. The temperature control parameters can be independently optimized for each zone while they operate in parallel, thereby maintaining manufacturing precision across all zones. The simultaneous operation of multiple zones multiplies the productivity compared to a single zone, breaking the trade-off between precision and rate.
Solution Approach 2:
By having multiple fusion zones propagate simultaneously and continuously through different regions of the powder bed, the patent ensures continuous useful action across the entire build area. This parallel continuous processing eliminates the sequential limitation of single-zone propagation, maintaining temperature control and surface finish quality in each zone while dramatically improving overall manufacturing rate through concurrent operations.
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 enhances manufacturing efficiency by reducing surface stresses and shape deviations, resulting in a product with improved surface finish and reduced internal stresses.
Implementation Method 1
supplying energy from a radiation gun according to an operating scheme determined for the powder layer to a selected area within the powder layer
Implementation Method 2
fusing together that area of the powder layer selected according to the operating scheme for forming a cross section
Implementation Method 3
the focal points of the radiation gun propagate at said two fusion points at a speed which corresponds to the wave propagation speed of the fusion zone
Implementation Method 4
calculating an energy balance for at least one part area within each powder layer, it being determined in the calculation whether energy fed into the part area is sufficient to maintain a defined working temperature of the part area
Data Source
AI summary
A method and arrangement for production of three-dimensional bodies by successive fusing together of selected areas of a powder bed, which parts correspond to successive cross sections of the three-dimensional body, which method comprises the following method steps: application of powder layers to a work table, supplying energy from a radiation gun according to an operating scheme determined for the powder layer to said selected area within the powder layer, fusing together that area of the powder layer selected according to said operating scheme for forming a cross section of said three-dimensional body, a three-dimensional body being formed by successive fusing together of successively formed cross sections from successively applied powder layers.