Irradiation Unit Thermal Decoupling in 3D Printing
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Solution Overview
Problem
Existing apparatuses for producing three-dimensional work pieces face challenges in precisely controlling the location of a radiation beam due to thermal deformations, leading to inaccuracies in the manufacturing process.
Innovation Solution
An apparatus with a support structure outside the process chamber thermally and mechanically decouples the irradiation unit and other components from the process chamber, maintaining a constant spatial relationship and preventing thermal and mechanical deformations, ensuring precise control of the radiation beam's direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the irradiation unit is integrated within the process chamber structure, then the device complexity is reduced, but thermal deformations cause loss of positioning precision and manufacturing precision deteriorates
Solution Approach 1:
The apparatus is divided into two independent support structures: a first support structure holding the process chamber and a second support structure holding the irradiation unit. This segmentation allows each component to be thermally isolated, preventing thermal deformations from affecting beam positioning precision while maintaining manageable device complexity through modular design.
Solution Approach 2:
The irradiation unit is extracted from the process chamber structure and mounted on a separate support structure. This extraction eliminates the thermal coupling between the heated process chamber and the irradiation unit, ensuring that thermal deformations do not compromise the precision of radiation beam positioning on the powder bed.
2Manufacturing precision
If the process chamber is thermally isolated from the support structure, then manufacturing precision is improved, but device complexity increases due to additional thermal management components
Solution Approach 1:
A thermal isolation layer is introduced as an intermediary between the process chamber and the first support structure. This layer acts as a thermal barrier that prevents heat transfer while maintaining the mechanical connection, thereby preserving the spatial relationship stability needed for manufacturing precision without requiring complete structural redesign.
Solution Approach 2:
The thermal isolation is applied asymmetrically: the process chamber is thermally isolated from its support structure, while the irradiation unit is separately mounted on a different support structure. This asymmetric approach targets thermal management specifically where needed (at the process chamber) without unnecessarily complicating the entire apparatus.
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 enhances the precision and quality of the three-dimensional work pieces by maintaining the spatial relationship between components unchanged, reducing the need for periodic calibration and improving the alignment of critical layers during the building process.
Implementation Method 1
The radiation penetrating into the powder layer causes heating and consequently melting or sintering of the raw material powder particles
Implementation Method 2
The raw material powder is than subjected to radiation (e.g., laser or particle radiation) in a site-selective manner
Implementation Method 3
a support structure provided outside the process chamber and supporting the irradiation unit
Implementation Method 4
In known apparatuses for producing a three-dimensional work piece, it is difficult to control a location where the radiation beam impinges onto the raw material powder over the entire manufacturing process, in particular due to thermal deformations of various structures and components of the apparatus
Implementation Method 5
In order to be able to direct the radiation beam in the x-y-plane, the irradiation unit may comprise at least one scanning unit. The scanning unit may comprise at least one movable mirror configured to direct the radiation beam to a desired location
Implementation Method 6
The irradiation unit may comprise a focus unit configured to change a focus position along the beam path of the radiation beam (substantially along the z-direction)
Implementation Method 7
a carrier configured to receive multiple layers of raw material powder
Implementation Method 8
a process chamber defining a volume through which the radiation beam is directed from the irradiation unit to the raw material powder
Data Source
Figure 1
AI summary
An apparatus for producing a three-dimensional work piece is provided. The apparatus comprises a carrier configured to receive multiple layers of raw material powder, an irradiation unit configured to direct at least two radiation beams to predetermined sites of an uppermost layer of the raw material powder in order to solidify the raw material powder at the predetermined sites, a process chamber defining a volume through which the radiation beams are directed from the irradiation unit to the raw material powder, and a support structure provided outside the process chamber and supporting the irradiation unit. The irradiation unit is not affected by process heat generated within the process chamber, such that positions of individual optical components within the irradiation unit with regard to each other stay constant.