Lamp Array Temperature Control for Additive Manufacturing
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Solution Overview
Problem
Additive manufacturing machines face challenges in maintaining temperature uniformity across the build material bed, leading to mechanical stress, incomplete sintering, and inferior quality of 3D printed objects due to temperature fluctuations and inadequate electromagnetic radiation.
Innovation Solution
A system utilizing a thermographic camera and a PID controller to monitor and adjust the power levels of an array of lamps positioned around the build material bed, assigning weights to lamps based on their position to maintain temperature homogeneity, ensuring that the build material is maintained at a temperature just below its coalescing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heating source is used to heat the build material bed, then the device complexity is reduced, but temperature uniformity across the build material bed deteriorates
Solution Approach 1:
The heating system is segmented into multiple independent heating zones, each controlled by individual heating elements positioned at different locations around the build material bed. This allows independent temperature control in different regions to achieve uniform overall temperature distribution.
Solution Approach 2:
Each heating zone is controlled independently with localized temperature adjustment capabilities. The system applies different heating intensities to different regions based on their specific thermal requirements, ensuring optimal temperature uniformity across the entire build material bed.
2Temperature
If temperature monitoring is performed at multiple points, then temperature uniformity control is improved, but measurement precision requirements increase
Solution Approach 1:
The build material bed is divided into multiple heating zones with dedicated temperature sensors for each zone. This segmentation allows localized temperature monitoring and control, reducing the precision requirements for individual sensors while maintaining overall temperature uniformity.
Solution Approach 2:
Temperature sensors in each zone provide real-time feedback to the control system, which adjusts heating power dynamically to maintain target temperature. This feedback mechanism compensates for moderate measurement variations and ensures consistent temperature control across all zones.
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 solution achieves structurally and visually superior 3D printed objects by maintaining temperature uniformity across the build material bed, preventing mechanical stress and ensuring complete sintering, thereby enhancing the quality of the printed objects.
Implementation Method 1
irradiating a build material bed with an array of lamps, the array of lamps comprising a plurality of lamps
Implementation Method 2
detecting, with a thermographic camera, a temperature of a control point within at least one zone of the build material bed
Implementation Method 3
The electromagnetic radiation may include infrared light, laser light, or other suitable electromagnetic radiation. Light absorbing components in the coalescing agent absorb the electromagnetic radiation to generate additional heat that sinters, melts, or otherwise coalesces the patterned build material
Data Source
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AI summary
A method of forming a three-dimensional object includes detecting, with a thermographic camera, a temperature of a control point within at least one zone of the build material bed, and adjusting a power level supplied to at least one of the lamps of the array of lamps if the detected temperature of the control point of the at least one zone of the build material bed is not equal to a set temperature.