3D Shaping Defect Prevention via Beam Reflection Monitoring
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Solution Overview
Problem
Current three-dimensional shaping methods using laser or electron beam sintering often result in sintering defects due to uneven beam control and powder layer issues, which are not detectable until completion of all laminating and sintering steps, leading to defective products.
Innovation Solution
A method that involves measuring the reflection intensity of the laser or electron beam during each sintering step, canceling sintering if defects are detected, and using spectral imaging to differentiate between beam control and powder layer surface problems, allowing for real-time defect detection and prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser beam or electron beam control system is used for sintering, then three-dimensional shaping can be achieved, but sintering defects occur due to excess or insufficiency of beam supply
Solution Approach 1:
The patent implements a feedback mechanism by measuring the reflection intensity of the laser beam or electron beam during sintering and comparing it against predetermined standards. When the reflection intensity falls outside the standard range, the system automatically issues a command to cancel further sintering, preventing defect propagation while maintaining the capability for three-dimensional shaping.
2Productivity
If powder layer formation and sintering are repeated in a sealed apparatus, then three-dimensional shaped products can be produced, but sintering defects are overlooked until completion
Solution Approach 1:
The patent applies preliminary action by performing reflection intensity measurement and defect judgment during each sintering step before the entire manufacturing process completes. This allows early detection of sintering defects and immediate cancellation of subsequent steps, preventing defective products while maintaining production efficiency through real-time monitoring.
3Device complexity
If sintering continues without real-time defect detection, then manufacturing process is simple, but defective three-dimensional shaped products are generated
Solution Approach 1:
The patent introduces a feedback mechanism that measures reflection intensity during sintering and compares it to predetermined standards. When defects are detected (reflection intensity outside standard range), the system automatically commands cancellation of further sintering. This maintains relatively simple device complexity while dramatically improving manufacturing precision and product quality.
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 the cancellation of defective sintering steps, preventing further lamination and sintering, and allows for efficient production of defect-free three-dimensional shaped products by identifying and correcting the cause of defects.
Implementation Method 1
a sintering step in which the powder layer is sintered by irradiation of a moving laser beam or electron beam
Implementation Method 2
a sintering step in which the powder layer is sintered by irradiation of a moving laser beam or electron beam
Implementation Method 3
a sintering step in which the powder layer is sintered by irradiation of a moving laser beam or electron beam
Implementation Method 4
Measuring the reflection intensity of the laser beam or electron beam irradiated during each sintering step
Data Source
AI summary
A three-dimensional shaping method utilizing a powder layer forming step, and a sintering step with a laser beam or electron beam, the method including the steps of a) measuring the reflection intensity of the beam irradiated in each sintering step, or the reflection intensity of other light, b) commanding to continue sintering within the next time unit, or when the next powder layer forming step is given, when it has been detected that the reflection intensity of the step a) is within a standard range for a given time unit, and, c) judging that a sintering defect has been produced, and commanding to cancel sintering in the next time unit, or when the next powder layer forming step is given, when it is detected that a condition has occurred in which the reflection intensity of step a) deviates from the standard range for a given time unit.