3D Printing Carriage Motion for Uniform Light Exposure
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Solution Overview
Problem
Additive manufacturing machines using non-scanning, stationary energy systems face challenges in achieving uniform light exposure across the work area, leading to varying object properties such as strength and smoothness due to unequal exposure times, which is not effectively addressed by existing layer processing cycles optimized for scanning light systems.
Innovation Solution
Implementing a non-scanning, stationary energy system with a light source and optic configuration that distributes fusing light uniformly over the work area, and controlling the movement of carriages to ensure equal exposure times across the work area through specific layering processes, such as those described in FIGS. 10-12, which balance exposure times by adjusting carriage positions and speeds to maintain uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-scanning, stationary energy system is used to irradiate the work area, then the system complexity is reduced and manufacturing speed is improved, but the uniformity of light exposure across the work area deteriorates
Solution Approach 1:
The patent applies dynamics by making the carriage movable rather than stationary. The carriage moves back and forth across the work area, allowing the stationary energy system to maintain its simplicity while achieving uniform light exposure through controlled movement. This resolves the contradiction by introducing motion to a previously static system, enabling both simplified device architecture and improved manufacturing precision.
2Productivity
If the carriage moves quickly to improve productivity, then the manufacturing speed is improved, but the uniformity of exposure time across different regions of the work area deteriorates
Solution Approach 1:
The patent implements feedback control through the controller that monitors and adjusts the carriage position and speed. The system uses feedback about the carriage's location and movement to dynamically adjust parameters, ensuring that each region of the work area receives the required exposure time regardless of the overall manufacturing speed. This allows high productivity to be maintained while preserving exposure uniformity.
Solution Approach 2:
The carriage performs periodic back-and-forth movements across the work area, creating a rhythmic exposure pattern. This periodic action ensures that different regions receive alternating periods of exposure, allowing the system to maintain uniformity across the entire work area while operating at high speeds. The cyclic nature of the movement enables consistent results throughout the manufacturing process.
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 results in objects with consistent properties across the work area, improving design margin and scalability by ensuring equal fusing and heating times, reducing the variability in object properties and enhancing the efficiency of the additive manufacturing process.
Implementation Method 1
a non-scanning, stationary energy system with a light source and an optic configuration to distribute light from the light source uniformly over the work area
Implementation Method 2
irradiating the work area uniformly with fusing light... simultaneously and uniformly irradiating the entire work area with fusing light... ensuring equal fusing and heating times
Data Source
AI summary
In an example, a method of fusing a 3D object layer with a stationary energy system positioned and a carriage that casts a shadow onto the work area includes, with one pass of the carriage moving over the work area at a constant speed, dispensing a liquid fusing agent onto a first layer of build material in a pattern corresponding to an object slice such that the exposure time of the patterned build material is unequal across the first layer and, with another pass of the carriage moving over the work area in the same direction and at the same constant speed as the first pass, spreading the next layer of build material over the first layer such that the exposure time of the patterned build material in the first layer is made equal across the first layer.