Mobile Optical System for Laser Sintering Gas Management
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Solution Overview
Problem
Existing sintering systems face challenges with complex alignment procedures for optical systems and inadequate localized gas management, leading to defects and inclusions in components during the powder bed fusion process.
Innovation Solution
A laser operating machine with a mobile optical system capable of focusing electromagnetic radiation on a predetermined area and an integrated gas suction and injection system to remove fumes and introduce gases locally, along with a fireproof gas container unit for additive manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed optical system is used above the work surface, then the system structure is simple, but complex alignment procedures are required and manufacturing precision deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the optical system mobile rather than fixed. The optical system is mounted on a mobile carrier that can move along the work surface, allowing dynamic positioning and focusing of the laser beam directly at the processing location. This eliminates complex alignment procedures while maintaining high manufacturing precision through real-time adaptive positioning.
2Device complexity
If gas management is performed globally in the chamber, then the system structure is simple, but localized fume removal is inadequate leading to defects
Solution Approach 1:
The patent applies the local quality principle by implementing localized gas management directly at the processing location. The mobile optical system integrates gas suction and injection capabilities at the focal point, enabling localized removal of process fumes and targeted introduction of support gases precisely where the laser processes the powder bed. This prevents defects and inclusions while maintaining reasonable system complexity.
3Ease of operation
If the optical system is mobile, then alignment procedures are simplified, but the device complexity increases
Solution Approach 1:
The patent applies the merging principle by integrating the mobile optical system with the gas management system on a common mobile carrier. The optical components, gas suction elements, and gas injection elements are combined into a single integrated mobile unit that moves together, simplifying operation while managing device complexity through functional integration rather than separate systems.
4Device complexity
If conventional gas containers are used, then the system is simple, but fire safety is compromised during laser sintering
Solution Approach 1:
The patent applies the inert atmosphere principle by specifying that gas containers in the laser sintering system must be fireproof or designed to contain fire. This creates a safe environment for storing flammable process gases by preventing fire propagation, addressing the fire safety hazard while maintaining relatively simple system architecture through appropriate material selection and containment design.
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 simplifies the alignment process, reduces defects, and ensures effective gas management, enhancing the precision and quality of components produced through powder bed fusion technology.
Implementation Method 1
a laser beam, by means of a lens system and a scanner, is used as a source of high power density heat
Implementation Method 2
The advantage linked to the use of a laser beam is that it can be focused on small dimensions, typically in the range between 30 μm and 180 μm in diameter
Implementation Method 3
designed to convey and focus the beam of electromagnetic radiation (120) emitted by the laser (102)
Implementation Method 4
a system (106) for the extraction of fumes and the introduction of support gases, designed to locally remove the process fumes from the work surface (130)
Implementation Method 5
introduce the process assistance gases into the powder bed of materials such as metals, plastic resins, polymers and composite components (131)
Implementation Method 6
necessary to lead to melt the powders of materials such as metals, plastics, resins, polymers and composite components only in certain predetermined areas
Implementation Method 7
which will then be selectively hit by the laser beam according to the desired geometry
Data Source
AI summary
A laser operating machine for laser sintering (100) is described for making three-dimensional objects starting from a digital 3D model by sintering the layers with the use of a laser source and an optical system, mechanical means for depositing a powder bed on a work surface, and a mechanical system to remove the fumes and/or pollutants deriving from the selective powder melting process as close as possible to the melted layer or layer, before they are dispersed inside the work chamber, and to introduce in the same chamber the process gases necessary for the processing of powder bed fusion in a localized manner, close to the layers or layers subject to the selective melting process.