Laser-Heated Fused Deposition Printing for Support-Free 3D Builds
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Solution Overview
Problem
Current 3D printing technologies, such as Selective Laser Sintering (SLS) and Fused Deposition Printing (FDP), face limitations in layer-by-layer builds, leading to issues like delamination and the need for sacrificial materials, which increase time, resource usage, and material requirements, especially when printing complex structures like those with overhangs.
Innovation Solution
A method and system that combines SLS and FDP, using a laser to heat and cool materials in real-time, allowing for direct digital cooling and extrusion, which enables printing in free space without sacrificial layers by controlling laser energy based on temperature feedback for enhanced adhesion and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If layer by layer builds are used in SLS and FDP, then material adhesion can be achieved, but delamination occurs and printing time increases
Solution Approach 1:
The patent applies preliminary action by pre-heating the substrate surface with a laser before material deposition. This prepares the surface in advance to ensure optimal adhesion conditions, allowing the deposited material to bond strongly without requiring prolonged layer-by-layer heating processes, thereby reducing overall printing time while maintaining strong layer adhesion.
2Strength
If heated bed is used to improve adhesion, then layer bonding is enhanced, but top layers become too hot causing delamination
Solution Approach 1:
The patent applies local quality by using a focused laser beam to heat only the specific substrate area where material will be deposited, rather than heating the entire build plate. This localized heating ensures adequate bonding temperature at the deposition site while keeping other areas, including previously deposited layers, at appropriate temperatures to prevent delamination.
Solution Approach 2:
The patent employs periodic action through pulsed laser heating cycles. The laser is applied in controlled pulses during material deposition, providing periodic thermal energy that enhances bonding at the interface without causing continuous overheating of upper layers. This intermittent heating pattern prevents temperature buildup that would lead to delamination.
3Adaptability or versatility
If sacrificial materials are used for overhangs, then complex structures can be printed, but material usage and printing time increase
Solution Approach 1:
The patent replaces the mechanical support structure approach with a thermal field approach. Instead of using sacrificial materials to physically support overhanging features, the system uses controlled laser heating to temporarily soften the substrate beneath overhangs, allowing material to be deposited and bond properly without mechanical support. This eliminates the need for additional sacrificial materials while enabling complex geometries.
4Strength
If laser power is increased to improve sintering, then material fusion is enhanced, but material degradation occurs
Solution Approach 1:
The patent implements feedback control by using a sensor to monitor the temperature or state of the material during laser processing. This real-time feedback allows the system to dynamically adjust laser power parameters, ensuring sufficient energy for complete fusion while preventing excessive heating that would cause material degradation. The closed-loop control maintains optimal processing conditions throughout deposition.
Solution Approach 2:
The patent applies dynamics by making the laser processing parameters adaptive and variable during the deposition process. Instead of using fixed high power settings, the system dynamically adjusts laser power, scan speed, and pulse duration based on real-time conditions such as material type, layer thickness, and deposition location. This dynamic parameter adjustment ensures adequate fusion while avoiding material degradation.
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 reduces delamination issues, allows for faster and more resource-efficient printing of complex structures by eliminating the need for sacrificial layers and enabling direct digital cooling, resulting in stronger and more robust 3D printed objects.
Implementation Method 1
directing laser energy from a laser to a region for material deposition
Implementation Method 2
heated nozzles that melts thermoplastic material
Implementation Method 3
cooling the material immediately after deposition of the material
Data Source
AI summary
A method of additive manufacturing of an object may include directing laser energy from a laser to a region for material deposition, extruding material using an extruder at the region of material deposition, sensing temperature within the region of the material deposition, and electronically controlling the laser energy using the temperature so as to sufficiently heat the region for material deposition prior to extruding the material to increase strength of the object. The method may include hardening or freezing extruded material through cooling in real-time.