Heat Source Calibration Using Absorption Modifiers in 3D Printing
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Solution Overview
Problem
Existing methods for calibrating heat sources in 3D printing processes using particulate material are inadequate, leading to unexpected variations in temperature control and poor control over object properties due to uncontrollable differences in heating.
Innovation Solution
A method involving the use of absorption modifiers, such as radiation absorbers or inhibitors, to adjust the power input of heat sources, allowing for precise calibration by measuring temperature differences across the build bed surface, ensuring consistent heating and reducing temperature differentials between fused and unfused areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known calibration methods using thermal sensors are used to measure temperature of individual regions, then temperature measurement is achieved, but unexpected variation in subsequent build process occurs
Solution Approach 1:
The patent changes the physical state of the particulate material from dry to saturated with liquid, fundamentally altering its thermal properties. This parameter change enables more reliable and consistent temperature measurements during calibration, eliminating the unexpected variations that occur with dry material calibration.
Solution Approach 2:
The patent introduces liquid saturation as an intermediary medium between the thermal sensor and the particulate material. This liquid intermediary improves thermal contact and heat transfer, enabling more accurate and consistent temperature measurements that reliably predict subsequent build process behavior.
2Manufacturing precision
If heat sources are operated at different power inputs to calibrate heating effects, then heating calibration data is obtained, but uncontrollable differences in heating occur
Solution Approach 1:
The patent changes the moisture content parameter of the particulate material from dry to saturated state, which fundamentally alters the thermal conductivity and heat capacity. This parameter change enables more controllable and consistent heating responses when calibrating heat sources at different power inputs, eliminating the uncontrollable heating differences observed with dry material.
3Adaptability or versatility
If multiple heat sources or different modes of the same heat source are used to heat particulate material, then comprehensive thermal control is achieved, but variability in heat source performance causes uncontrollable heating differences
Solution Approach 1:
The patent changes the thermal parameters of the particulate material by saturating it with liquid, which increases thermal conductivity and heat capacity. This parameter change makes the heating process more predictable and uniform when using multiple heat sources or different heating modes, eliminating the variability and uncontrollable heating differences that occur with dry material.
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 accurate calibration of heat sources, improving temperature control and object quality by maintaining consistent heating profiles, thereby reducing warping and curling issues and enhancing mechanical and visual properties of 3D printed objects.
Implementation Method 1
a thermal sensor, such as a pyrometer or thermal camera, that detects the temperature of the build bed surface
Implementation Method 2
depositing a first amount of absorption modifier in the form of radiation absorber over the first region
Data Source
AI summary
A method for calibrating a heat source, used in manufacturing 3D object(s) from particulate material, including layer cycle steps of: (a) distributing a layer of particulate material; (b) heating a region of the layer with a heat source at a power input over a period of time; (c) measuring the temperature of the region; (d) depositing a radiation absorber over the region and/or an absorption inhibitor over a surrounding area; (e) heating the region and a second region within the surrounding area at a second power input and period of time; and (f) measuring a second temperature of the region and a third temperature of the second region; repeating the layer cycle using different pairs of input powers from the preceding pairs; and determining for each layer an adjusted input power(s); and applying the adjusted input powers to the heat source in steps (b) and (e) for a subsequent cycle.