Selective Post-Exposure Scanning for Stronger 3D Printed Layers
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Solution Overview
Problem
Additive manufacturing methods like laser sintering are time-consuming and require high-energy lasers, which are expensive and necessitate complex cooling solutions, limiting the variability of energy input during the solidification process, especially for objects with diverse geometries that require different treatment of positions within a cross-section.
Innovation Solution
A computer-based method for providing control data to an additive manufacturing apparatus that divides the region to be solidified into a first and second partial region, where the first region is solidified with standard energy input and the second region undergoes repetition scanning with higher energy input to maintain the building material above its melting point, allowing for more precise energy distribution and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-energy laser is used for solidifying building material, then solidification quality is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent segments the energy input process into two distinct phases: a pre-heating phase using a radiant heater panel that applies energy areally to the entire layer, and a subsequent solidification phase using the laser beam that targets only specific positions. This segmentation allows the laser to operate at lower energy levels since the material is already pre-heated, thereby reducing the complexity of cooling systems required for the laser while maintaining solidification quality.
Solution Approach 2:
The patent applies preliminary action by using the radiant heater panel to pre-heat the building material layer before the laser solidification process. This pre-heating action raises the baseline temperature of the material, reducing the energy gap that the laser must bridge to achieve solidification. Consequently, the laser can operate at lower power levels, simplifying the cooling infrastructure needed.
2Adaptability or versatility
If areal energy supply is used for solidification, then energy input variability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent segments the energy input into two functional components: an areal pre-heating component using a radiant heater panel that provides uniform energy distribution across the entire layer, and a localized solidification component using a laser beam that provides precise energy delivery to specific positions. This segmentation enables both high energy input variability (through the areal heater) and high manufacturing precision (through the targeted laser).
Solution Approach 2:
The patent applies local quality by differentiating the energy input strategy across different spatial zones: the radiant heater panel provides uniform areal energy distribution to the entire building material layer for pre-heating, while the laser beam provides localized, position-specific energy input for solidification. This allows each zone to receive the appropriate type and amount of energy for its specific function, achieving both versatility and precision.
3Productivity
If standard solidification scanning is used, then manufacturing speed is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-heating the building material layer with a radiant heater panel before the laser solidification scan. This pre-heating ensures that the material is already at an optimal temperature range when the laser passes through, promoting complete melting and better inter-layer adhesion. The result is improved mechanical properties without sacrificing manufacturing speed, as the laser can maintain its scanning velocity while the material responds more effectively due to the pre-applied thermal energy.
Solution Approach 2:
The patent implements continuity of useful action by having the radiant heater panel continuously or periodically apply thermal energy to the building material layer during or between laser scanning operations. This continuous thermal input ensures that the material remains in an optimal temperature state for solidification throughout the manufacturing process, consistently improving mechanical properties across all layers without interrupting the overall manufacturing workflow.
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 manufacturing time, enhances mechanical properties of the objects by ensuring complete melting and better adhesion of layers, while avoiding overheating and energy wastage, thus improving the efficiency and quality of the additive manufacturing process.
Implementation Method 1
by solidifying the building material by supplying radiation energy to positions in each layer that are assigned to the cross-sections of the objects in this layer
Implementation Method 2
by scanning these positions by means of an energy input unit with at least one beam for inputting energy into the building material
Implementation Method 3
for the repetition scanning the energy input parameters are set such that the temperature of the building material within the area of incidence of the beam on the building material lies above of a melting point of the building material
Data Source
AI summary
Disclosed is a method for providing control data for an additive manufacture device having a first step of accessing model data, and a second step of generating a data model in which a construction material layer region to be solidified during the production of an object section is specified for a construction material layer. The region to be solidified is divided into a first sub-region and a second sub-region, and a respective solidification scan of the region locations to be solidified is specified in a data model. The scan solidifying the construction material, and a repeated scan, is specified at the locations of the second sub-region but not at the locations of the first sub-region. The energy input parameter during the repeat scan is measured such that the temperature of the construction material lies above a melting temperature. The method further includes a third step of providing data models generated in the second step as control data for integrating into a control data set.