Metal 3D Print Head Alignment for Thermal Expansion Control
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Solution Overview
Problem
Existing 3D metal printers face challenges in ensuring continuous operation, reproducibility of drops, energy efficiency, and maintaining short non-productive times due to the relative movement between the crucible and the metallic print head, which can lead to misalignment and undesired chemical reactions, particularly when using materials with low thermal conductivity.
Innovation Solution
The print head design includes a housing with a multipart configuration, a cooling flange, insulating plate, and a centering device comprising a flange, clamping device, and centering sleeve to ensure concentric alignment and thermal management, with a melting region adjacent to an inert atmosphere to prevent misalignment and chemical reactions, allowing for axial and radial expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ceramic or ceramic-like crucible is used to melt liquid metal, then the melting process is effective, but relative movement between the crucible and the metallic print head causes misalignment and thermal expansion issues
Solution Approach 1:
The housing is divided into multiple parts (first housing part, second housing part, cooling flange) that can move independently relative to each other, allowing the crucible to expand thermally without affecting the overall alignment of the print head components
Solution Approach 2:
The patent utilizes thermal expansion by allowing the crucible to expand radially when heated, while the housing parts are designed with clearance to accommodate this expansion. The cooling flange with its specific thermal conductivity creates a temperature gradient that manages expansion differently in various zones
2Loss of energy
If materials with low thermal conductivity are used for the actuator adaptation, then heat transport is impeded, but the design flexibility is restricted
Solution Approach 1:
Different housing parts have different thermal conductivity properties - the cooling flange has higher thermal conductivity to conduct heat away, while other parts have lower thermal conductivity to insulate. This localized differentiation allows optimized thermal management without restricting overall design flexibility
Solution Approach 2:
The housing is constructed from multiple materials with different thermal properties (metallic parts with varying thermal conductivities), creating a composite structure that simultaneously achieves heat transport control and design flexibility
3Manufacturing precision
If the print head components are rigidly fixed together, then alignment is maintained, but thermal expansion stresses cause misalignment and potential failure
Solution Approach 1:
The connection between housing parts is designed to be dynamic rather than rigid - allowing controlled movement and expansion while maintaining functional alignment. The cooling flange and housing parts can move relative to each other to accommodate thermal expansion
Solution Approach 2:
The design incorporates clearance and movement capability beforehand to cushion against thermal expansion stresses, preventing misalignment and potential failure before they occur
4Productivity
If the print head operates continuously at high temperature, then productivity is maintained, but thermal stresses and misalignment risks increase
Solution Approach 1:
The segmented housing design allows different parts to respond independently to thermal stress, maintaining alignment while enabling continuous operation. The cooling flange separates the thermal zones, allowing the melting region to remain hot while other parts stay cooler
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 design ensures reproducible actuation, improved printing quality, and modular replacement of parts, maintaining consistent droplet production and reducing thermal stresses, while allowing for continuous operation and efficient temperature management.
Implementation Method 1
the cooling flange (25) comprising cooling channels (31) arranged between the cooling flange (25) and the insulating plate (26), and a coolant flowing through them
Implementation Method 2
an insulating plate (26) arranged on the cooling flange (25)... the insulating plate (26)... on sides of the cooling channels (31)
Implementation Method 3
a piston (5) configured in a plurality of parts... in such a way that the liquid phase (8) of the metal (14) can be made to pass through the outlet opening (10) by driving the piston (5)
Implementation Method 4
the reservoir (7, 27) connected to the cooling flange (25) and/or the insulating plate (26) by a centering device (50)... ensures that a relative movement of the materials having different thermal expansion is allowed, but they nevertheless remain centrally positioned with respect to one another
Data Source
AI summary
The invention relates to a print head for a 3D printer comprising a housing, a device for supplying a metal, a piston, a reservoir with an outlet opening and an actuator device, the housing comprising at least a cooling flange, an insulating plate and the reservoir. The reservoir is connected to the cooling flange and/or the insulating plate by a centering device comprising a flange, a clamping device and a centering sleeve, an active surface connects the reservoir to the flange such that the reservoir is concentrically aligned with respect to the cooling flange and/or the insulating plate, the clamping device connects the flange to the cooling flange and/or the insulating plate, and the centering sleeve is arranged in the cooling flange and/or the insulating plate such that the centering sleeve centrally aligns the piston with respect to the reservoir.