Powder Bed Fusion Layer-State Detection for Defect Control

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Solution Overview

Problem

Existing 3D manufacturing devices face challenges in producing high-quality 3D manufactured objects due to issues such as defects in the solidified layer, shape failures, and insufficient strength, which are often caused by inadequate control over the manufacturing conditions during the powder bed fusion process.

Innovation Solution

A calculation device integrated into the manufacturing apparatus that includes a detection unit to monitor the state of the material layer based on its shape and an output unit to adjust the manufacturing conditions in real-time, ensuring optimal power density, energy density, and temperature distribution for each layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If real-time detection and adjustment of manufacturing conditions is implemented, then manufacturing precision and quality are improved, but device complexity increases

Engineering Contradiction:

Improvemanufacturing precisionVSAvoiddevice complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the detection unit continuously monitors the state of the material layer (temperature, shape, density) during the manufacturing process and transmits this information to the calculation device. The calculation device then adjusts the manufacturing conditions (energy beam parameters, layer formation conditions) based on the detected state, creating a closed-loop control system that improves manufacturing precision while managing complexity through systematic feedback processing.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system enables self-adjustment of manufacturing conditions by using the detection unit's measurements to automatically modify process parameters. The calculation device autonomously determines optimal manufacturing conditions based on real-time detection data, reducing the need for external intervention and complex manual control systems, thereby improving precision without proportionally increasing device complexity.

Inventive Principle:

Principle #25Self-service

2Manufacturing precision

If detection unit is added to monitor material layer state, then manufacturing precision is improved, but device complexity increases

Engineering Contradiction:

Improvemanufacturing precisionVSAvoiddevice complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The detection unit is designed with multi-functionality, serving multiple purposes: monitoring temperature distribution, detecting material layer shape, assessing density, and providing data for process optimization. By consolidating these detection functions into a single integrated unit rather than separate devices, the system improves manufacturing precision while minimizing the increase in device complexity through functional integration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If real-time adjustment of manufacturing conditions is performed, then reliability of manufactured object is improved, but loss of time in processing increases

Engineering Contradiction:

ImprovereliabilityVSAvoidloss of time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system maintains continuous monitoring and adjustment of manufacturing conditions throughout the entire manufacturing process. The detection unit operates continuously to track material layer state, and the calculation device continuously adjusts parameters, ensuring that reliability improvements are achieved through uninterrupted optimization rather than intermittent corrections, thereby minimizing time loss.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The detection unit anticipates potential defects by monitoring material layer state in real-time and provides early warning signals. The calculation device performs preliminary adjustments to manufacturing conditions before defects actually occur, preventing quality issues rather than correcting them afterward, thus improving reliability without significant time penalty.

Inventive Principle:

Principle #10Preliminary action

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 enables the production of high-quality 3D manufactured objects by maintaining precise control over the manufacturing conditions, reducing defects, and improving the structural integrity of the final product.

Implementation Method 1

heating a layer-shaped material layer formed of a powder material by irradiation with an energy beam

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

a detection unit configured to obtain a state of the material layer based on a shape of the formed material layer

Methodology Applied

Scientific EffectShape detection:

Data Source

PatentUS12263527B2Computation device, detection system, molding device, computation method, detection method, molding method, computation program, detection program, and molding program

Publication Date: 2025.04.01 NIKON CORP

AI summary

A calculation device used in a manufacturing apparatus for producing a 3D manufactured object from a solidified layer formed by heating a layer-shaped material layer formed of a powder material by irradiation with an energy beam includes a detection unit configured to obtain a state of the material layer based on a shape of the formed material layer, and an output unit configured to output information on the state of the material layer obtained by the detection unit to set a manufacturing condition of the manufacturing apparatus.