Flow Device Internal Passages Smooth Finish via Melt Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing additive manufacturing methods for flow devices, such as fuel nozzles, result in internal passages with poor surface finish due to surface asperities, which affect metal fatigue and fuel flow uniformity, and traditional surface finishing techniques are ineffective for complex internal passages.
Innovation Solution
A method involving the use of a parent material with a higher melting point, where an internal flow volume made of a channel material is melted and allowed to diffuse into the parent material, creating a smooth flow channel with a mirror finish, potentially using cold or hot isostatic pressing and additive manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If additive manufacturing is used to create internal passages, then complex geometries can be achieved, but surface finish deteriorates with poor surface quality and asperities
Solution Approach 1:
A smooth outer surface is created on the flow volume before it is disposed in the parent material. This preliminary smoothing action ensures that when the flow volume melts and diffuses into the parent material, the resulting internal flow channel inherits the smooth surface characteristics, thereby resolving the surface finish problem while maintaining complex geometry
Solution Approach 2:
The invention changes the physical state of the flow volume material from solid to liquid through melting, and utilizes diffusion as a transport mechanism. By controlling the melting and diffusion parameters, the material transitions in a way that preserves the smooth surface geometry while creating the desired internal flow channel structure
2Manufacturing precision
If traditional surface finishing techniques are applied, then surface roughness can be reduced, but they are ineffective for complex internal passages
Solution Approach 1:
Instead of attempting to finish the internal surfaces after the flow device is manufactured (which is inaccessible), the invention inverts the approach by creating the smooth surface on the external flow volume before insertion. The smooth surface is then transferred to the internal channel during the melting and diffusion process, making surface quality achievable without direct access to the internal passages
Solution Approach 2:
The flow volume acts as an intermediary carrier that holds the smooth surface geometry. This intermediary object is easily manufacturable with smooth surfaces, and through the melting and diffusion process, it transfers its surface characteristics to the internal flow channels of the final device, bypassing the need for direct surface finishing of the channels themselves
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 produces flow devices with improved surface finish and enhanced performance by creating smooth complex internal flow channels, increasing the life and efficiency of flow devices like fuel nozzles.
Implementation Method 1
causing the internal volume to melt within the parent material
Implementation Method 2
allowing at least a portion of the first material to diffuse into the parent material, thereby leaving behind the at least one internal feature within the parent material. A diffusion gradient can exist such that an amount of channel material becomes greater closer to the wall that defines the flow channel
Implementation Method 3
Causing the flow volume to melt can include subjecting the channel material and the parent material to at least one of cold isostatic pressing or hot isostatic pressing
Data Source
AI summary
A method for producing a device having at least one internal feature includes manufacturing an internal volume of the internal features out of a first material, disposing the internal volume in a parent material that has a higher melting point than the first material, causing the internal volume to melt within the parent material, and allowing at least a portion of the first material to diffuse into the parent material, thereby leaving behind the at least one internal feature within the parent material.