Internal Passage Deposit Removal in Additive Cooling Channels
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Solution Overview
Problem
Additively manufactured objects with internal passages often experience unintended deposits on their inner walls, which can lead to deteriorated fluid characteristics and reduced cooling performance due to increased pressure loss.
Innovation Solution
A method is introduced to check for and selectively remove deposits from the inner walls of internal passages in additively manufactured objects, using techniques such as electrical discharge machining or chemical polishing, thereby maintaining the surface roughness and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical polishing is applied to remove deposits from all internal passages, then deposit removal is achieved, but surface roughness is lost and heat transfer performance deteriorates
Solution Approach 1:
The patent applies different treatments to different internal passages based on their individual conditions. Internal passages with deposits undergo chemical polishing, while those without deposits retain their original roughened surfaces. This selective local treatment resolves the contradiction by preserving surface roughness and heat transfer performance in passages that do not require cleaning.
Solution Approach 2:
The patent segments the internal passages into two groups: those requiring deposit removal and those not requiring treatment. By checking each passage individually and applying treatment only where necessary, the system avoids uniform treatment that would compromise overall heat transfer performance while still addressing contamination issues.
2Temperature
If additive manufacturing creates rough inner wall surfaces for heat transfer promotion, then cooling efficiency is improved, but deposits can adhere to these surfaces
Solution Approach 1:
The patent performs a checking step before treatment to identify which internal passages have deposits. This preliminary detection allows for targeted treatment only where necessary, preserving the beneficial rough surface characteristics in passages that remain free of deposits while removing deposits only from affected passages.
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 effectively prevents the deterioration of fluid characteristics and maintains the heat transfer promoting effect of the surface roughness, ensuring effective cooling of the additively manufactured objects by selectively removing deposits only where necessary.
Implementation Method 1
a rough inner wall surface 3 is formed in the internal passage 2, and thereby a heat transfer promoting effect is obtained
Implementation Method 2
the deposit 50 is removed by performing electrical discharge machining
Implementation Method 3
the deposit 50 is removed by performing chemical polishing using an etchant
Data Source
AI summary
A method of manufacturing an additively manufactured object includes: checking, for an additively manufactured object including a plurality of internal passages, the presence or absence of a deposit in each inner wall surface of the plurality of internal passages; and selectively removing the deposit from the internal passage in which the deposit has been detected in the checking, among the plurality of internal passages.