Profiled Metal Strip Diaphragm Bellows Stress Reduction
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Solution Overview
Problem
Existing diaphragm bellows have a limited service life due to inadequate material distribution and stress concentration at welding seams, leading to premature failure under mechanical stress.
Innovation Solution
A diaphragm bellows is constructed using pre-profiled metal strips with reverse-bent borders, where the strips are wound and joined with material joints, enhancing material distribution and reducing stress at the seams, and optionally incorporating non-reverse-bent strips to create a spiral structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard metal strip is used without reverse bending, then the manufacturing process is simple, but the service life is limited due to stress concentration at welding seams
Solution Approach 1:
The metal strip is pre-profiled with reverse bending at the borders before winding and welding. This preliminary shaping creates a material doubling effect at the seam areas, which reduces stress concentration during subsequent operation and extends the service life of the diaphragm bellows
Solution Approach 2:
The reverse bending is applied locally only at the border areas of the metal strip where welding seams will form, rather than throughout the entire strip. This creates enhanced material thickness specifically at the stress-prone welding locations while maintaining the overall simplicity of the strip structure
2Reliability
If material is uniformly distributed in the metal strip, then the manufacturing is simple, but stress concentration occurs at welding seams leading to premature failure
Solution Approach 1:
The metal strip is designed with non-uniform material distribution through reverse bending at the borders, creating localized material doubling specifically at the welding seam areas. This addresses the stress concentration problem at critical locations without requiring complex material distribution throughout the entire strip
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 solution significantly prolongs the service life of the diaphragm bellows by distributing material stress evenly and providing a gastight, flexible structure resistant to mechanical stress.
Implementation Method 1
at least one border of the strip material of the metal strip is subjected to reverse bending
Data Source
AI summary
A profiled metal strip for a diaphragm bellows is made from a strip material having at least one border which is subjected to reverse bending. Such a metal strip is wound to produce a diaphragm bellows, with abutting borders of neighboring turns being connected with one another by a material joint, such as a welding seam.