3D Printing Exposure Control for Layer Adhesion and Cracking
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Solution Overview
Problem
In 3D printing, the significant difference in UV exposure times between bottom layers and subsequent layers leads to uncured cracking and reduced printing quality due to uneven energy distribution between layers.
Innovation Solution
A control method that defines transition layers with adjusted exposure times, balancing the exposure time of bottom layers with regular layers to prevent cracking and enhance adhesion, by determining the exposure time of transition layers based on the exposure times of bottom and regular layers, and updating exposure times based on pixel differences between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the exposure time of bottom layers is set to be longer to improve adhesion, then the adhesion between model and printing platform is improved, but the UV exposure time difference between bottom layer and subsequent layers increases, causing uncured cracking and reducing printing quality
Solution Approach 1:
The patent applies dynamics by making the exposure time adjustable and variable across different layers. Instead of using a fixed exposure time for all layers, the system dynamically adjusts exposure time based on layer position (bottom layers, middle layers, top layers) and model characteristics, allowing optimal adhesion for bottom layers while preventing cracking in subsequent layers
Solution Approach 2:
The patent implements parameter changes by modifying the exposure time parameter across different layers. The exposure time is changed from a single uniform value to a graduated sequence of values, with longer exposure times for bottom layers and progressively shorter times for upper layers, thereby resolving the contradiction between adhesion requirements and cracking prevention
2Strength
If the exposure time of bottom layers is significantly longer than subsequent layers, then adhesion is improved, but energy distribution between layers becomes uneven, causing uncured cracking
Solution Approach 1:
The patent applies local quality by assigning different exposure time characteristics to different regions (layers) of the model. Bottom layers receive longer exposure times for strong adhesion, while upper layers receive progressively shorter exposure times appropriate to their position, creating locally optimized energy distribution that prevents both adhesion failures and cracking
Solution Approach 2:
The system dynamically adjusts energy distribution across layers by varying exposure time. This dynamic approach allows the energy input to be optimized for each layer's specific requirements, ensuring uniform effective energy distribution throughout the model while maintaining strong interlayer adhesion
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 method ensures stable adhesion between layers, reduces the likelihood of cracking, and improves the overall printing quality by maintaining consistent energy distribution across layers.
Implementation Method 1
a UV exposure (photopolymer exposure) time of the bottom layer is greatly different from that of a subsequent printing layer
Data Source
AI summary
A control method, a control system, a readable storage medium, and a 3D printing equipment are provided. The method includes; obtaining at least one parameter of an exposure time of a first-type slice and an exposure time of a third-type slice of a model to be printed; obtaining a quantity of printing layers for a second-type slice of the model to be printed; determining an exposure time of the second-type slice and processing the model to be printed based on the exposure time of the first-type slice, the second-type slice and the third-type slice. By setting an exposure time appropriately, a transition layer is defined for the model to be printed, to facilitate a transition of an exposure time of bottom layers, which enhances connection strength between printing layers and reduces a possibility of model cracking.