Additive Manufacturing Chamber Foreign Matter Detection

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Solution Overview

Problem

Additive manufacturing devices pose safety risks due to the potential for harmful devices to remain operational or for clean and dirty powders to be mixed, especially when foreign matter is present, leading to hazards for operators and affecting the quality of the final three-dimensional article.

Innovation Solution

A method and apparatus utilizing a position detecting device connected to a control unit to automatically switch off harmful devices and power on safe powder suction devices only when foreign matter is detected within the enclosable chamber, employing an electromagnetic radiation curtain or a robot arm to ensure safe operation and prevent powder mixing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If harmful devices are kept operational for continuous production, then productivity is improved, but safety risk increases when foreign matter is present

Engineering Contradiction:

Improvecontinuous productionVSAvoidsafety risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system uses a position detecting device to continuously monitor the enclosable chamber for foreign matter and provides feedback to the control unit. When foreign matter is detected, the control unit automatically switches off harmful devices, creating a closed-loop safety system that resolves the contradiction between continuous operation and safety by dynamically adjusting device operation based on real-time conditions

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The safety system operates autonomously without requiring manual intervention. The position detecting device and control unit work together to automatically detect foreign matter and switch off harmful devices, allowing the system to self-regulate its safety state while maintaining productivity during normal operation

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If manual switching off of power supply is implemented for safety, then safety risk is reduced, but ease of operation deteriorates due to operational interruptions

Engineering Contradiction:

Improvesafety riskVSAvoidoperational interruptions

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The system performs safety monitoring and device shutdown automatically without requiring operator action. The control unit receives signals from the position detecting device and independently executes the shutdown sequence, eliminating the need for manual intervention while maintaining safety

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The automatic feedback mechanism continuously monitors chamber conditions and triggers appropriate responses without human involvement, resolving the contradiction by making the safety system self-activating rather than manually operated

Inventive Principle:

Principle #23Feedback

3Productivity

If clean and dirty powders are allowed to mix for continuous processing, then productivity is improved, but manufacturing precision deteriorates due to powder contamination

Engineering Contradiction:

Improvecontinuous processingVSAvoidpowder contamination

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The system extracts and removes dirty powder from the enclosable chamber using a powder suction device before introducing or spreading clean powder. This separation process prevents contamination while maintaining continuous operation capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The powder suction device operates in advance to remove dirty powder before the clean powder is introduced or before the next manufacturing step begins, preventing contamination from occurring in the first place while maintaining continuous processing flow

Inventive Principle:

Principle #10Preliminary action

4Manufacturing precision

If powder suction device is always powered on for safe powder handling, then manufacturing precision is improved, but use of energy increases

Engineering Contradiction:

Improvepowder handling safetyVSAvoidenergy consumption

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The powder suction device operates periodically rather than continuously, activating only when the position detecting device signals the presence of foreign matter or when needed for powder removal. This periodic operation maintains powder handling safety while significantly reducing energy consumption compared to continuous operation

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8570534B1Safety protection method and apparatus for additive manufacturing device

Publication Date: 2013.10.29 ARCAM AB

AI summary

A method for providing safety protection in an additive manufacturing apparatus for forming a three-dimensional article through successive fusion of parts of a powder bed in an enclosable chamber, which parts corresponds to successive cross sections of the three-dimensional article is provided. The method comprising the steps of providing a position detecting device connected to a control unit to detect whether a foreign matter is within the enclosable chamber. The method may also include, upon detecting that the foreign matter is within the enclosable chamber, either (1) switching off, via the control unit, at least one device associated with the additive manufacturing apparatus; or (2) providing power to a powder suction device. Associated safety protection devices are also provided.