Optical Unit Temperature Control in 3D Powder Bed Fusion
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Solution Overview
Problem
Existing three-dimensional powder bed fusion technologies face inaccuracies and decalibration due to uneven heating and varying operating temperatures within the irradiation device, leading to suboptimal quality in produced work pieces.
Innovation Solution
An apparatus with a control unit that adjusts the temperature of the optical units and shielding gas within the process chamber to maintain consistent operating conditions, using heat transfer arrangements and feedback loops to stabilize temperatures and reduce thermal expansion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the irradiation device operates for extended periods, then productivity is improved, but temperature variations cause inaccuracies and decalibration
Solution Approach 1:
The patent implements feedback control by continuously monitoring the temperature of optical elements and adjusting cooling parameters accordingly. Temperature sensors detect thermal variations in real-time, and the control system modifies cooling gas flow or cooling element operation to maintain optimal temperature ranges, thereby preserving irradiation accuracy during extended production periods.
Solution Approach 2:
The patent actively manages temperature parameters by introducing cooling mechanisms that adjust thermal conditions of optical elements. By changing the temperature parameter through controlled cooling, the system prevents thermal expansion and refractive index changes that would otherwise degrade irradiation accuracy over time.
2Stability of the object's composition
If cooling is applied to optical elements, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent introduces cooling gas as an intermediary medium between the heat-generating optical elements and the environment. The cooling gas absorbs excess heat from optical elements through convection and thermal conduction, transporting it away from critical components. This intermediary approach provides effective temperature control while avoiding direct mechanical contact that would complicate the system further.
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 ensures accurate and high-quality production of three-dimensional work pieces by maintaining homogeneous temperature distribution across optical elements and within the process chamber, thereby reducing inaccuracies and achieving stable operating conditions over extended periods.
Implementation Method 1
a heat transfer arrangement (38) configured to transfer heat generated by a heat source (40) of the heat transfer arrangement to the at least one optical unit (26, 32)
Implementation Method 2
The laser radiation penetrating into the powder layer causes heating and consequently melting or sintering of the raw material powder particles
Implementation Method 3
heating and consequently melting or sintering of the raw material powder particles
Implementation Method 4
heating and consequently melting or sintering of the raw material powder particles
Data Source
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AI summary
An apparatus (10) for producing a three-dimensional work piece (12) comprises a process chamber (14) accommodating a carrier (16) for receiving a raw material powder (18) and an irradiation device (20) for selectively irradiating electromagnetic or particle radiation onto the raw material powder (18) applied onto the carrier (16) in order to produce the work piece (12) from said raw material powder (18) by an additive layer construction method, the irradiation device (20) comprising at least one radiation source (22, 24) and at least one optical unit (26, 32) with a plurality of optical elements (28, 34). A heat transfer arrangement (38) is configured to transfer heat generated by a heat source (40) to the at least one optical unit (26, 32) of the irradiation device (20). The apparatus further comprises a control unit (42) configured to control the heat transfer arrangement (38) so as to adjust a temperature of the at least one optical unit (26, 32) of the irradiation device (20).