Additive Layer Irradiation Patterns for Thin Walls and Overhangs
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Solution Overview
Problem
Additive manufacturing processes face challenges in controlling energy input for solidification in complex geometries, leading to irregularities and nonuniform surface quality due to variations in irradiation parameters, particularly in filigree regions and overhanging structures.
Innovation Solution
A method for selectively irradiating material layers in additive production using a combination of continuous and pulsed irradiation patterns, defined by computer-aided manufacturing, to optimize irradiation parameters based on component geometry, reducing overheating and improving surface and structural properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous irradiation is used for solidification, then productivity is improved, but manufacturing precision deteriorates due to irregularities in molten pool and nonuniform surface
Solution Approach 1:
The patent applies periodic action by using pulsed irradiation instead of continuous irradiation. The irradiation is delivered in controlled pulses with specific duty cycles, allowing the material to cool between pulses and preventing overheating. This periodic energy input maintains productivity while significantly improving surface quality and dimensional accuracy by controlling molten pool formation and solidification.
Solution Approach 2:
The patent implements dynamics by making irradiation parameters adjustable and adaptive. The system dynamically modifies irradiation parameters including pulse duration, duty cycle, peak power, and spacing between pulses based on the specific geometric features being manufactured. This dynamic control allows optimization for different regions (e.g., filigree vs. bulk areas) to achieve both high productivity and precision.
2Productivity
If high energy input is used for rapid solidification, then productivity is improved, but manufacturing precision deteriorates due to overheating in locally limited regions
Solution Approach 1:
The pulsed irradiation delivers high peak power for rapid solidification during the pulse duration, then allows cooling during the off-period. This periodic high-energy input achieves rapid solidification rates for productivity while preventing cumulative overheating that would compromise dimensional accuracy. The duty cycle parameter controls the ratio of heating to cooling time.
Solution Approach 2:
The patent applies local quality by tailoring irradiation parameters to specific local geometric features. Different pulse durations, powers, and spacing are used for different regions of the component - for example, finer pulses for filigree regions and longer pulses for bulk areas. This localized parameter optimization enables rapid solidification where needed while preventing overheating in sensitive regions.
3Ease of operation
If predetermined irradiation parameters are used, then ease of operation is improved, but manufacturing precision deteriorates due to variations in irradiation vector width
Solution Approach 1:
The system transitions from static predetermined parameters to dynamic adaptive parameters. The irradiation parameters are no longer fixed but are dynamically adjusted based on real-time feedback and pre-programmed geometric data. The system automatically modifies pulse duration, power, and spacing to compensate for variations in irradiation vector width, maintaining manufacturing precision while keeping operation simple through automation.
Solution Approach 2:
The patent implements feedback mechanisms where irradiation parameters are continuously monitored and adjusted. The system uses feedback from geometric data about the component being manufactured to automatically modify irradiation parameters, ensuring uniform results despite variations in irradiation vector width. This closed-loop control maintains precision without increasing operational complexity.
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 enhances surface quality and dimensional accuracy by 50 to 100% in additive manufacturing, particularly in challenging regions like thin walls and overhangs, by controlling energy input through modulated irradiation patterns.
Implementation Method 1
selective laser melting (SLM) or laser sintering (SLS)
Implementation Method 2
controlling an energy input of the corresponding energy beam used for the solidification of the component layer
Data Source
AI summary
A method for selectively irradiating a material layer in additive production. The method includes: providing geometry data having geometry information of individual layers of a component that is to be produced by additive means, and defining an irradiation pattern for the layers by a computer-supported production method, wherein the irradiation pattern has a contour and a surface region in layers, wherein first contour vectors of the contour are specified for continuous irradiation operation and second contour vectors of the contour are specified for pulsed irradiation operation. A method for providing a data set, an additive production method, a corresponding device and a corresponding computer program product selectively irradiate a material layer in additive production.