Laser-Assisted Hotspot Mitigation for 3D Printing
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Solution Overview
Problem
In three-dimensional printing, uneven hotspots on the build surface due to temperature differences and inhomogeneous materials lead to decreased bonding properties between the build surface and newly deposited molten metal layers, resulting in poor quality printed parts.
Innovation Solution
A method of stepwise laser-assisted heating is employed, where the build surface is heated incrementally using multiple laser pulses in a time-controlled pattern, allowing for even temperature distribution and mitigating hotspot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single laser pulse is used to heat the build surface, then the heating process is fast and simple, but uneven hotspots are created due to inhomogeneous material distribution and surface unevenness
Solution Approach 1:
The single laser pulse is segmented into multiple pulses applied at different locations on the build surface. The system divides the heating process into sequential steps, where each pulse heats a specific region, and the laser position is updated based on detected temperature distributions to ensure uniform overall heating without creating hotspots.
Solution Approach 2:
The heating process uses periodic laser pulsing with controlled intervals. Multiple pulses are applied in sequence with appropriate timing between them, allowing heat to distribute uniformly across the build surface while maintaining heating efficiency. The periodic action enables the system to overcome the limitations of single-pulse heating by distributing energy across multiple cycles.
2Strength
If the build surface temperature is increased to improve bonding, then bonding properties improve, but hotspot formation increases due to inhomogeneous material properties
Solution Approach 1:
The system applies laser heating locally to different regions of the build surface based on detected temperature distributions and material properties. By identifying cooler regions and directing laser pulses to those specific areas, the system ensures uniform temperature distribution across the entire surface, preventing hotspot formation while maintaining adequate bonding temperature throughout.
Solution Approach 2:
The system incorporates temperature detection and feedback control to monitor the build surface temperature in real-time. Based on the detected temperature distribution, the system adjusts laser pulse positioning and timing to compensate for inhomogeneous material properties, ensuring uniform heating that optimizes bonding strength without creating hotspots.
3Manufacturing precision
If multiple laser pulses are applied in a time-controlled pattern, then temperature uniformity is improved, but the heating process becomes more complex and time-consuming
Solution Approach 1:
The system uses the build surface's own thermal properties and the detected temperature distribution to automatically determine the optimal heating pattern. The feedback from temperature detection enables the system to self-adjust the laser pulse timing and positioning, reducing the need for complex external control mechanisms while achieving uniform heating.
Solution Approach 2:
The heating control system dynamically adjusts laser pulse parameters based on real-time temperature feedback. The system adapts the timing, position, and intensity of laser pulses according to the detected temperature distribution and material properties, enabling precise control that achieves uniform heating without requiring overly complex predetermined control sequences.
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 uniformly heated build surface, enhancing the bonding properties between layers and improving the overall quality of three-dimensional printed parts by reducing hotspot-related issues.
Implementation Method 1
a laser system for impinging more than one laser pulses in a time controlled pattern at the build surface to heat the build surface
Implementation Method 2
heating the build surface from the original temperature of the build surface to a desired temperature of the build surface
Data Source
AI summary
A system and method of three-dimensional printing that includes heating a portion of a build surface by impinging multiple laser pulses onto the build surface in a time controlled pattern to provide a desired heated build surface prior to depositing a molten material onto the build surface. The time controlled pattern of laser pulses includes at least one heating period and at least one cooling period, and the time for the cooling period is determined by the cooling time of the build surface material, and the temperature differences between the original temperature of the build surface and the desired temperature of the build surface material.