Additive-Manufactured Waveguide Walls Thinned by Chemical Polishing

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Solution Overview

Problem

Conventional waveguide manufacturing methods struggle with producing devices with complex cross-sections, leading to high weight and cost due to thick wall thicknesses, which are difficult to achieve with existing 3D printing techniques.

Innovation Solution

An additive manufacturing process involving selective laser melting (SLM) followed by chemical polishing to reduce the thickness of waveguide device side walls, achieving a thickness of less than 0.5 mm, and preferably less than 0.3 mm or 0.2 mm, thereby reducing the weight and cost of the device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If additive manufacturing with SLM is used to produce waveguide devices, then manufacturing complexity is reduced and design freedom is improved, but wall thickness cannot be reduced below 0.5 mm due to laser beam diameter constraints

Engineering Contradiction:

Improvemanufacturing complexityVSAvoidwall thickness precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by designing the waveguide with intentionally thicker walls during the additive manufacturing process. The initial wall thickness is set to be greater than the minimum required thickness, allowing subsequent material removal through chemical or mechanical polishing to achieve the final precise thickness. This preliminary over-design enables the use of additive manufacturing for complex geometries while still achieving the required precision in the final product.

Inventive Principle:

Principle #10Preliminary action

2Weight of moving object

If wall thickness is reduced to below 0.5 mm to reduce device weight, then weight is reduced, but manufacturing precision and structural integrity are compromised

Engineering Contradiction:

Improvedevice weightVSAvoidwall thickness control

Core Design Contradiction:

Weight of moving objectVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces mechanical machining with chemical or electrochemical polishing to remove material from the additive manufactured waveguide. This substitution allows for more precise and controlled material removal, achieving wall thicknesses below 0.5 mm with better surface finish and more uniform thickness control compared to traditional mechanical methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If conventional manufacturing methods are used for complex cross-sections, then structural integrity is maintained with sufficient wall thickness, but device weight and manufacturing cost increase

Engineering Contradiction:

Improvestructural integrityVSAvoiddevice weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The patent changes the manufacturing parameters and process sequence by combining additive manufacturing with subsequent chemical or electrochemical polishing. This hybrid approach allows the initial structure to be manufactured with thicker walls for structural integrity, then precisely reduces the wall thickness to optimal values while maintaining the required strength and structural integrity through controlled material removal.

Inventive Principle:

Principle #35Parameter changes

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 process effectively reduces the weight of waveguide devices by thinning the side walls while maintaining the structural integrity and precision required for RF applications, thus addressing the challenges of high weight and cost associated with conventional methods.

Implementation Method 1

selective laser melting (SLM) followed by chemical polishing

Methodology Applied

Scientific EffectSelective laser melting: Melting

Implementation Method 2

a laser is used to fuse fine metal particles. Following a computer-determined pattern, it melts the metal particles until they fuse together

Methodology Applied

Scientific EffectLaser heating: Heating

Implementation Method 3

a step of chemical polishing of the metal core in order to reduce, preferably uniformly, the thickness of said side walls by an ablation thickness

Methodology Applied

Scientific EffectChemical polishing: Ablation

Data Source

PatentUS20250030145A1Method for manufacturing a waveguide device by additive manufacturing and polishing

Publication Date: 2025.01.23 SWISSTO 12 SA

AI summary

The invention relates to a method of manufacturing a waveguide device including a step of producing, by additive manufacturing, a semi-finished metal core having side walls having external and internal surfaces, the internal surfaces defining an internal waveguide opening. The manufacturing process further includes a step of chemically polishing the metal core to reduce the thickness of the side walls by an ablation thickness equal to at least twice a roughness of the metal core before polishing, to obtain the waveguide device. The invention also includes a waveguide device obtained according to the above-mentioned process.