Horizontal Additive Manufacturing for Rocket Fuel Grain Uniformity
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Solution Overview
Problem
Traditional methods for manufacturing hybrid rocket fuel grains are limited by the need for vertical production, which restricts the height of the fuel grain and requires sectioning, leading to potential gas leaks and prolonged curing times, while also limiting the complexity and consistency of the fuel grain structure.
Innovation Solution
A horizontal additive manufacturing method that produces fuel grains in a continuous bead pattern following the central core axis, using a form-shaped support structure and mechanized build platform to eliminate sectioning and enhance uniformity, allowing for more complex structures and faster production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fuel grains are produced vertically using conventional casting methods, then air bubbles can rise to the top ensuring uniformity, but the height of the fuel grain is limited and curing time is prolonged
Solution Approach 1:
The patent inverts the conventional vertical production method by implementing horizontal additive manufacturing. Instead of building the fuel grain from bottom to top vertically, the system deposits material layers horizontally perpendicular to the central port axis, allowing unlimited grain length while maintaining uniformity through controlled layer-by-layer construction.
Solution Approach 2:
The invention transitions from vertical (one-dimensional height constraint) to horizontal (multi-dimensional layer deposition) manufacturing. By changing the orientation of production from vertical to horizontal, the system eliminates the height limitation imposed by vertical casting while preserving compositional uniformity through precise material deposition control.
2Stability of the object's composition
If fuel grains are produced in sections to maintain uniformity for larger engines, then consistency is improved, but gaps can form between sections creating potential gas leaks
Solution Approach 1:
The patent applies segmentation by dividing the fuel grain production into sequential horizontal layers that are deposited continuously. Each layer is built upon the previous one, creating a monolithic structure without gaps or joints between sections, thereby eliminating gas leak pathways while maintaining compositional consistency through controlled material deposition.
Solution Approach 2:
The invention merges multiple fuel grain sections into a single continuous structure by using additive manufacturing to deposit material layer-by-layer along the entire length of the grain. This continuous deposition process eliminates the need for separate sections and their associated joints, creating a unified structure that prevents gas leaks while maintaining uniformity.
3Stability of the object's composition
If conventional additive manufacturing is used to produce fuel grains vertically, then uniformity is achieved, but the height is limited by gravity effects and machine structure
Solution Approach 1:
The patent inverts the conventional vertical additive manufacturing approach by implementing horizontal layer deposition. Instead of building upward against gravity, the system deposits material layers horizontally perpendicular to the central port axis, eliminating gravitational distortion and machine height constraints while maintaining uniformity through precise deposition control.
Solution Approach 2:
The invention changes the manufacturing dimension from vertical to horizontal, allowing the fuel grain to extend along the horizontal axis without being constrained by machine vertical travel or gravitational effects. This dimensional transition enables production of much longer fuel grains while preserving compositional uniformity.
4Stability of the object's composition
If vertical production methods are used, then air bubbles rise ensuring uniform composition, but manufacturing time is extended due to curing requirements
Solution Approach 1:
The patent implements continuous horizontal layer deposition without interruption, eliminating the need for prolonged curing periods associated with vertical casting. The additive manufacturing process continuously builds the fuel grain structure layer-by-layer, significantly reducing total manufacturing time while maintaining uniform composition through controlled material placement.
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 enables the production of fuel grains with increased uniformity and consistency, reduced points of failure, and improved combustion efficiency by eliminating gaps and voids, while allowing for larger, more complex designs and faster manufacturing times.
Implementation Method 1
A horizontal additive manufacturing method that produces fuel grains in a continuous bead pattern following the central core axis
Implementation Method 2
using a form-shaped support structure and mechanized build platform
Data Source
AI summary
A system and method for producing fuel grain for a rocket engine horizontally with an additive manufacturing machine is disclosed. To begin, a fuel grain model is received. The fuel grain model is oriented in a direction of a central core axis and divided into two-dimensional layers with defined footprint areas. In accordance with the fuel grain model, a first layer is printed by applying successive fuel beads in a direction primarily parallel to the central core axis.