3D Concrete Printing via Reactive Injection in Loose Material Bed
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Solution Overview
Problem
Conventional three-dimensional printing methods require customized forms for creating objects, which limits efficiency and flexibility in producing complex structures with customized boundaries.
Innovation Solution
A method and apparatus for three-dimensional printing that uses a bed of loose material, such as Portland cement mix, where a reactive solution is injected to create concrete structures through a controlled hydration process, allowing for continuous freeform fabrication without the need for layer-by-layer construction, utilizing an injection apparatus with nozzles to dispense the reactive solution and control the voxel formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional three-dimensional printing methods use customized forms for creating objects, then manufacturing precision is improved, but device complexity and productivity deteriorate due to the need for custom forms for each object
Solution Approach 1:
The patent extracts and removes the customized form from the printing system, replacing it with a reusable support structure that can accommodate multiple different objects. The support structure is separated from the final product and can be reused for printing different objects, eliminating the need to create custom forms for each object while maintaining manufacturing precision.
Solution Approach 2:
The support structure is designed to be universal and multi-functional, capable of supporting multiple different objects with various geometries and boundaries. This single reusable structure replaces the need for multiple customized forms, thereby improving productivity while maintaining the ability to achieve precise object boundaries.
2Manufacturing precision
If conventional three-dimensional printing uses layer-by-layer construction, then manufacturing precision is improved, but productivity deteriorates due to the time-consuming sequential process
Solution Approach 1:
The patent implements continuous freeform fabrication by injecting material continuously through nozzles that move along programmed paths, eliminating the sequential layer-by-layer process. The material is deposited in a continuous stream following the desired object geometry, maintaining precision while dramatically improving fabrication speed through uninterrupted material deposition.
Solution Approach 2:
The patent uses hydraulic injection systems to deliver material through nozzles in a controlled continuous flow. This hydraulic delivery mechanism enables precise material placement along continuous paths, replacing the mechanical layer-by-layer deposition process and achieving both high precision and improved productivity through continuous action.
3Ease of manufacture
If conventional three-dimensional printing creates objects layer by layer, then ease of manufacture is improved, but loss of time worsens due to the sequential construction process
Solution Approach 1:
The patent replaces the sequential layer-by-layer construction with continuous freeform fabrication where material is injected continuously along programmed nozzle paths. This continuous process maintains manufacturing simplicity through automated control while eliminating the time-consuming sequential nature of traditional methods, significantly reducing fabrication time.
4Device complexity
If conventional three-dimensional printing uses standardized support structures, then device complexity is reduced, but adaptability worsens due to inability to accommodate customized boundaries
Solution Approach 1:
The patent employs a reusable support structure combined with dynamically controllable nozzle systems that can be programmed to follow custom paths. The support structure remains simple and reusable, while the nozzle positioning and material injection are dynamically controlled to accommodate any customized object boundaries, achieving both low device complexity and high adaptability.
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
Enables the efficient creation of complex three-dimensional concrete structures with customized boundaries by controlling the voxel size and shape, achieving strong concrete with a favorable water-to-cement ratio and allowing for the reuse of unreacted material, with the ability to incorporate reinforcing materials and utilities within the printed object.
Implementation Method 1
reacting the first liquid and the second liquid with a first portion of the bed of loose solid material to form a solid three-dimensional object
Implementation Method 2
The reaction is described in the present example as taking place in a bed of Portland cement mix
Data Source
AI summary
Methods and equipment are disclosed relating to three-dimensional printing that include positioning an array of nozzles within a bed of loose solid material, moving the array of nozzles through the bed of loose solid material while injecting a liquid from the array of nozzles in a controlled pattern causing the liquid to react with a portion of the bed of loose solid material forming a solid concrete three-dimensional object. An unreacted portion of the bed of loose solid material may then be separated from the solid three-dimensional object.