Shrink-Fitted Ceramic Assembly Using Heated Deep-Drawn Steel Pipe
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Solution Overview
Problem
The use of deep-drawn stainless steel pipes for shrink-fitting ceramic bodies in heat exchangers often results in breakage due to work hardening, which increases surface pressure during the shrink-fitting process.
Innovation Solution
A method involving heating the deep-drawn stainless steel pipe to 900°C or more before inserting the ceramic body, which softens the pipe and reduces the risk of breakage, using a seamless pipe configuration to improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If deep-drawn stainless steel pipe is used for shrink-fitting, then manufacturing cost and productivity are improved, but the ceramic body breaks due to increased surface pressure from work hardening
Solution Approach 1:
The patent applies preliminary action by heating the deep-drawn stainless steel pipe before shrink-fitting to reduce its hardness and surface pressure. This preliminary heat treatment prevents ceramic body breakage during the subsequent shrink-fitting process, allowing the use of cost-effective deep-drawn pipes while maintaining product reliability
Solution Approach 2:
The patent changes the temperature parameter of the stainless steel pipe from room temperature to elevated temperature (heating treatment). This parameter change reduces the pipe's hardness and surface pressure, enabling successful shrink-fitting of ceramic bodies without breakage while maintaining the advantages of deep-drawn pipe manufacturing
2Ease of manufacture
If deep-drawn stainless steel pipe is used for shrink-fitting, then manufacturing cost is reduced, but the ceramic body breaks due to work hardening
Solution Approach 1:
The patent applies preliminary action by heating the deep-drawn stainless steel pipe before shrink-fitting to reduce its hardness and surface pressure. This preliminary heat treatment prevents ceramic body breakage during the subsequent shrink-fitting process, allowing the use of cost-effective deep-drawn pipes while maintaining product reliability
Solution Approach 2:
The patent changes the temperature parameter of the stainless steel pipe from room temperature to elevated temperature (heating treatment). This parameter change reduces the pipe's hardness and surface pressure, enabling successful shrink-fitting of ceramic bodies without breakage while maintaining the advantages of deep-drawn pipe manufacturing
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 method effectively suppresses breakage of the ceramic body during shrink-fitting, enhancing the durability and reliability of the heat exchanger components.
Implementation Method 1
a heating step of heating the deep-drawn stainless steel pipe to 900° C. or more
Implementation Method 2
the metal pipe is heated, and the ceramic body is inserted into a predetermined position in the metal pipe, and then cooled
Data Source
AI summary
A method for producing a shrink-fitted member by arranging a pillar shaped ceramic body inside a deep-drawn stainless steel pipe and shrink-fitting them. The method includes: a preparing step of preparing the deep-drawn stainless steel pipe produced by deep-drawing and the pillar shaped ceramic body; a heating step of heating the deep-drawn stainless steel pipe to 900° C. or more; and a shrink-fitting step of inserting the pillar shaped ceramic body into the heated deep-drawn stainless steel pipe and shrink-fitting them.