3D Powder Sintering with Region-Specific Laser Spectra
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Solution Overview
Problem
The existing three-dimensional shaping method faces challenges in achieving high mechanical strength and dimensional accuracy when sintering powders of different materials with laser light, often resulting in undesirable deformation and insufficient bonding strength due to excessive melting.
Innovation Solution
A method involving the use of different compositions with distinct particles, such as magnesium and alumina, and varying laser light spectra for bonding, where each region is irradiated with a specific spectrum to optimize energy absorption and bonding, and a solvent removal step to prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single laser light spectrum is used to sinter both first powder and second powder regions, then the sintering process is simple and fast, but excessive melting occurs or bonding strength is insufficient, deteriorating dimensional accuracy
Solution Approach 1:
The patent applies different laser light spectra to different material regions: a first laser light spectrum optimized for sintering the first powder and a second laser light spectrum optimized for sintering the second powder. This local differentiation allows each material region to receive the most appropriate energy input, preventing excessive melting in one region while ensuring sufficient bonding in another, thereby resolving the contradiction between fast uniform sintering and precise dimensional control across heterogeneous materials.
Solution Approach 2:
The patent changes the spectral parameters of the laser light according to the material being sintered. By adjusting the laser wavelength and spectral characteristics to match the absorption properties of different powders (first powder vs. second powder), the process achieves optimal sintering conditions for each material type, preventing the dimensional inaccuracies that would result from using a fixed single spectrum across all materials.
2Strength
If laser energy is increased to ensure sufficient bonding strength in both powder regions, then bonding strength improves, but excessive melting occurs causing deformation and reducing dimensional accuracy
Solution Approach 1:
The patent implements location-specific laser parameters where the first region receives a first laser light spectrum and the second region receives a second laser light spectrum. This allows each region to be bonded with the minimum necessary energy tailored to its material properties, preventing the excessive melting and deformation that would occur if a uniformly high energy level were applied to both regions.
Solution Approach 2:
The patent applies the principle of partial action by using different laser spectra that are each optimized for their specific material region. Rather than applying excessive energy uniformly to all regions to ensure bonding, the system applies precisely the right amount and type of energy to each region, achieving sufficient bonding strength without the harmful effects of over-sintering.
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 enables the production of three-dimensional shaped articles with enhanced mechanical strength and dimensional accuracy by ensuring proper bonding and preventing deformation, even when using materials with different light absorption spectra.
Implementation Method 1
a bonding step of bonding the particles by irradiation with a laser light
Implementation Method 2
bonding of the particles in the first region and the bonding of the particles in the second region are performed by irradiation with laser lights with a different spectrum
Data Source
AI summary
A three-dimensional shaped article production method according to the invention is a method for producing a three-dimensional shaped article by stacking layers formed in a predetermined pattern, wherein a series of steps including a composition supply step of supplying a composition containing a plurality of particles to a predetermined part, and a bonding step of bonding the particles by irradiation with a laser light is performed repeatedly, and the composition supply step includes a step of forming a first region using a first composition containing first particles as the composition, and a step of forming a second region using a second composition containing second particles which are different from the first particles as the composition, and the bonding of the particles in the first region and the bonding of the particles in the second region are performed by irradiation with laser lights with a different spectrum.