Movable Insert Build Plate for Additive Manufacturing Thermal Expansion
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Solution Overview
Problem
Additive manufacturing build plates face challenges in managing thermal expansion and contraction, which can lead to thermal distortion and reduced product quality due to uneven heat distribution and rapid temperature changes during the layering process.
Innovation Solution
A build plate assembly with a movable insert seated in a receptacle, where the insert is heated by a base with integrated heating elements and cooled by cooling elements, allowing it to expand and contract within the receptacle, while the receptacle is designed to accommodate these changes, ensuring stable support for the product being built.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the build plate is heated to maintain temperature during additive manufacturing, then the material fusion and build quality improve, but thermal expansion causes distortion and dimensional inaccuracy
Solution Approach 1:
The build plate is segmented into a fixed plate portion and a movable insert portion. The insert can be independently heated and positioned, allowing it to expand into the receptacle without causing distortion of the entire build plate structure. This segmentation isolates thermal effects to a controllable component.
Solution Approach 2:
The insert is designed to be movable within the receptacle, transitioning between retracted and extended positions. During heating, the insert dynamically extends to accommodate thermal expansion. The system uses actuators to control the insert position, enabling real-time adaptation to thermal conditions during the manufacturing process.
2Productivity
If the build plate undergoes rapid temperature changes during layering, then the manufacturing speed improves, but residual stress increases and reduces product quality
Solution Approach 1:
By separating the build plate into fixed and movable segments, the insert can undergo rapid temperature changes independently while the main plate remains stable. This allows fast heating/cooling cycles on the insert without inducing residual stress in the entire build plate structure.
Solution Approach 2:
The receptacle acts as an intermediary that accommodates the insert's thermal expansion and contraction. The tapered walls of the receptacle provide a controlled interface that allows the insert to move freely during temperature changes, preventing stress buildup while maintaining build stability.
3Stability of the object's composition
If the insert is fixed in the build plate, then the structural stability improves, but thermal expansion causes distortion and reduces build accuracy
Solution Approach 1:
The insert is designed with dynamic positioning capability, allowing it to move between retracted and extended positions within the receptacle. This dynamic design enables the insert to accommodate thermal expansion while maintaining stable contact with the build surface, preserving both stability and accuracy.
Solution Approach 2:
The system changes the positional parameter of the insert based on thermal conditions. When the insert is heated and expands, it is allowed to extend into the receptacle. The actuator system adjusts the insert position in real-time, maintaining optimal contact pressure and build accuracy despite thermal parameter changes.
4Manufacturing precision
If the build plate accommodates thermal expansion of the insert, then thermal distortion is reduced, but the device complexity increases due to movable components
Solution Approach 1:
The build plate is divided into a simple fixed plate and a separate movable insert. The insert contains the complexity of the movable mechanism, while the main plate remains structurally simple. This segmentation localizes the complexity to only where it is needed for thermal accommodation.
Solution Approach 2:
The movable insert is nested within the receptacle of the build plate. The insert can move in and out of the receptacle to accommodate thermal expansion. This nested configuration allows the complex movable component to be integrated within the existing build plate structure, minimizing overall system complexity.
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 product quality by minimizing thermal distortion, reducing residual stress, and improving heat distribution, leading to more predictable and successful builds by accommodating the thermal expansion and contraction of the insert, thus maintaining the integrity of the build plate and extending its lifespan.
Implementation Method 1
the base including a heating element configured to heat the insert
Implementation Method 2
The insert is configured to expand within the receptacle when heated by the heating element
Implementation Method 3
the base includes a cooling element configured to cool the base and the insert
Implementation Method 4
The insert is configured to contract from the expanded configuration in response to being cooled by the cooling element of the base
Implementation Method 5
heating an insert of a build plate with a heating element included with a base supporting the insert
Data Source
AI summary
A build plate assembly configured for use with an additive manufacturing machine. The build plate assembly includes a build plate defining a receptacle extending through the build plate. An insert is seated in the receptacle and movable within the receptacle. The insert includes a build surface configured to support a product built thereon by the additive manufacturing machine. The insert is seated on a base including a heating element configured to heat the insert. The insert is configured to expand within the receptacle when heated by the heating element. The receptacle is configured to accommodate the expansion.