3D Printing Build Chamber for Zoned Binder Curing
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Solution Overview
Problem
Current 3D printing techniques face issues with thermally curable binder agents evaporating due to temperatures near or above the boiling point of carrier liquids, causing contamination and defects in the printed layers and green parts, necessitating separate printing and curing processes that prolong the production time.
Innovation Solution
A 3D printing system that performs the printing and curing of thermally curable binder agent in parallel within the build chamber, using a controllable heating element to maintain specific temperature zones for efficient curing without overheating upper layers and allowing lower layers to cool, thereby reducing production time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the build chamber is heated to cure the binder agent, then the curing efficiency is improved, but the carrier liquids in the binder agent evaporate causing contamination and defects
Solution Approach 1:
The build chamber is divided into multiple temperature zones: a first temperature zone for printing binder agent and a second temperature zone for curing. This segmentation allows different regions to operate at different temperatures simultaneously, enabling curing without causing evaporation in the printing zone.
Solution Approach 2:
Different regions of the build chamber are assigned different thermal properties and temperature levels. The curing zone maintains high temperature for binder curing, while the printing zone maintains lower temperature to prevent evaporation. This local differentiation of thermal conditions resolves the contradiction between curing efficiency and evaporation prevention.
2Object-generated harmful factors
If separate printing and curing processes are used, then evaporation and defects are minimized, but production time is prolonged
Solution Approach 1:
The printing process and curing process are merged into a single integrated operation within the same build chamber. While layers are being printed in the first temperature zone, previously printed layers are simultaneously cured in the second temperature zone. This combining of processes eliminates the need for separate sequential operations, significantly reducing production time while maintaining quality.
Solution Approach 2:
The curing action continues continuously throughout the printing process rather than being performed as a separate batch operation. As soon as binder agent is deposited, the corresponding region is exposed to curing temperature, maintaining continuous useful action and eliminating idle time between printing and curing.
3Productivity
If high temperature is applied to cure binder agent, then curing speed is improved, but upper layers overheat and lower layers cannot cool properly
Solution Approach 1:
The heating system is segmented into multiple independently controllable heating zones corresponding to different vertical positions in the build chamber. Each zone can be controlled at different temperature levels, allowing the curing zone to operate at high temperature for fast curing while upper printing zones and lower cooling zones maintain appropriate temperatures.
Solution Approach 2:
The temperature distribution in the build chamber is made dynamic and adjustable during the printing process. The controller can modify temperature settings in different zones based on the current printing stage and layer position, optimizing curing speed while preventing overheating of upper layers and ensuring proper cooling of lower layers.
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 system significantly speeds up the generation of green parts by integrating printing and curing processes, minimizing contamination and defects, and ensuring uniform curing of binder agent across layers.
Implementation Method 1
a controllable heating element to maintain specific temperature zones for efficient curing
Implementation Method 2
The thermally curable binder agent has to be thermally cured to form a sufficiently strong green part
Data Source
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AI summary
According to one example, there is provided a 3D printing build unit comprising a build chamber, a build platform, and a heating element controllable to heat a portion of the contents of the build chamber to a temperature at or above a curing temperature whilst maintaining upper layers of the build chamber at or below a printing temperature.