Setting Bolt Sealing Against Corrosion
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Solution Overview
Problem
Existing fastening systems using setting bolts are prone to corrosion and hydrogen embrittlement when exposed to environmental moisture, leading to potential failure of the attachment.
Innovation Solution
A fastening system that incorporates a sealing element with an axial extent of at least 5-50% of the setting bolt's length, which expands to seal the bolt from environmental moisture, preventing corrosion and hydrogen embrittlement by encasing the bolt between the attachment and the object, using an elastic material like elastomers or plastics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a setting bolt is made of carbon steel to reduce costs, then production costs are reduced, but the bolt is susceptible to corrosion and hydrogen embrittlement when exposed to moisture
Solution Approach 1:
A sealing element is introduced as an intermediary component between the setting bolt and the environment. This sealing element prevents direct contact between moisture and the carbon steel bolt, thereby protecting the bolt from corrosion and hydrogen embrittlement while allowing the use of cost-effective carbon steel material
Solution Approach 2:
The sealing element functions as a flexible protective shell that encases the setting bolt. This flexible sealing structure creates a barrier against environmental moisture, protecting the bolt from harmful effects while maintaining the mechanical functionality of the fastening system
2Device complexity
If the sealing element has a small axial extent, then device complexity is reduced, but the sealing effectiveness is insufficient to protect the setting bolt from moisture
Solution Approach 1:
The axial extent of the sealing element is optimized to a specific range (at least 5-20% of the setting bolt length). This parameter optimization ensures sufficient sealing effectiveness to protect the bolt from moisture while avoiding excessive size that would increase device complexity
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 system effectively seals the setting bolt from environmental influences, preventing corrosion and hydrogen embrittlement, allowing the bolt to withstand high loads over time, even when made of susceptible materials, while reducing production costs.
Implementation Method 1
the sealing element seals off this axial partial section with respect to the environment, so that the setting bolt is not exposed to moisture from the environment as a result
Data Source
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AI summary
A fastening system for fastening an add-on part on a setting object comprises a setting bolt having a first end and a second end, comprising a fastening section and a load application section, a sealing element with an opening for sealing the setting bolt inserted into the setting object when the setting bolt is arranged within the opening, and the add-on part being fastened on the load application section of the setting bolt.