Hot Bed Deformation Tolerance for Large 3D Printers
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Solution Overview
Problem
Large-sized continuous fiber high-temperature 3D printers experience deformation and jamming due to thermal expansion of the hot bed, particularly in the X and Y directions, which affects the mechanical properties and application of printed parts, especially in aerospace and defense fields.
Innovation Solution
A hot bed deformation tolerance structure that uses a secured hot bed support assembly and motion device coordination to compensate for thermal expansion through a mechanical passive compensation method, allowing for motion redundancy and adaptation to different temperatures without monitoring or structural modifications, utilizing an aluminum alloy material with a high thermal expansion coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the hot bed is rigidly secured to the frame, then the structural stability is improved, but thermal deformation causes jamming of motion modules
Solution Approach 1:
The patent transforms the rigid securing structure into a dynamic compensation structure. The hot bed support assembly includes linear motion modules that allow the hot bed to dynamically adjust its position in response to thermal expansion, converting static rigid connections into dynamic adaptive connections that maintain reliability while accommodating thermal deformation
Solution Approach 2:
The patent changes the parameter of connection rigidity from fixed rigid to flexible adaptive. By introducing linear motion modules with adjustable clearance, the system can change its mechanical parameters (clearance, motion freedom) based on temperature conditions, allowing rigid support at low temperature and flexible compensation at high temperature
2Manufacturing precision
If chamber preheating is used to reduce temperature difference, then material warping is reduced, but thermal deformation of motion modules increases
Solution Approach 1:
The patent segments the support system into multiple independent components: the frame, the hot bed support assembly, and the linear motion modules. This segmentation allows different parts to have different thermal behaviors - the frame remains relatively stable while the support assembly can accommodate thermal deformation through the linear motion modules, isolating the motion modules from excessive thermal stress
3Area of stationary object
If a large-sized hot bed is used, then printing capacity is improved, but thermal expansion deformation increases
Solution Approach 1:
The patent introduces linear motion modules as intermediary elements between the hot bed and the frame. These intermediaries absorb and compensate for the thermal expansion of the large hot bed, allowing the hot bed to maintain its large printing area while the intermediaries handle the dimensional changes, preventing direct transmission of deformation to the motion modules
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
The structure effectively prevents deformation and jamming by compensating for thermal expansion in both X and Y directions, ensuring stable operation and preventing motion module errors, suitable for both high-temperature and low-temperature environments.
Implementation Method 1
a high-temperature hot bed supported by a Z axis has horizontal deformation in X and Y directions during moving, resulting in deformation and jamming of a printer actuation module
Data Source
AI summary
A hot bed deformation tolerance structure for a large-sized continuous fiber high-temperature 3D printer is provided. Size changes caused by thermal expansion of a hot bed are compensated through motion coordination of a secured hot bed support assembly and a motion device, especially for an aluminum alloy material. A Z-direction motion structure of this structure is fixedly mounted with a frame and works at room temperature. A compensation motion module is fixedly mounted with a Z axis and incompletely secured with the hot bed support assembly, and works at room temperature with the Z axis. The hot bed support assembly is incompletely secured and partially in a high-temperature chamber, with a maximum working temperature of 300° C. The hot bed support assembly retains motion redundancy in a direction of thermal expansion deformation, tolerates thermal deformation through a linear motion module, and compensates for metal deformation through horizontal motion coordination.