Self-Aligning Nose Cap for Expandable Member Installation
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Solution Overview
Problem
Conventional installation tools for expandable members, such as bushings, face challenges with misalignment and side loads during installation, leading to excessive wear, manufacturing delays, and increased costs due to the need for multiple angled nose caps and spacers for different angles and surface curvatures, which complicates the installation process and increases installation time.
Innovation Solution
A self-aligning nose cap assembly with rotational degrees of freedom and a retention sleeve system that allows the mandrel to be aligned with the expandable member independently of the workpiece surface geometry, reducing side loads and enabling proper installation without the need for extensive measuring or multiple nose caps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional installation tools with fixed angled nose caps are used, then alignment with specific angle holes can be achieved, but the device complexity increases due to needing multiple nose caps for different angles
Solution Approach 1:
The nose cap is made rotatable relative to the mandrel, allowing dynamic adjustment of the nose cap's angular orientation. This enables a single nose cap to align with holes at various angles by rotating to the appropriate orientation, eliminating the need for multiple fixed-angle nose caps while maintaining alignment precision
Solution Approach 2:
The rotatable nose cap design makes a single component serve multiple functions by accommodating various hole angles. Instead of requiring separate nose caps for different angles, one universal rotatable nose cap can be positioned at any required angle to align the mandrel with the hole axis
2Manufacturing precision
If multiple angled nose caps are used for different angles, then proper alignment can be achieved, but the installation time increases due to selecting and changing nose caps
Solution Approach 1:
The rotatable nose cap allows the installer to adjust the alignment angle dynamically during the installation process by simply rotating the nose cap to the required orientation, rather than stopping to change entire nose cap assemblies. This significantly reduces the time required to adapt to different hole angles while maintaining precise alignment
3Manufacturing precision
If manual holding of the bushing is required during installation, then positioning control can be achieved, but the ease of operation decreases and installation time increases
Solution Approach 1:
The retention sleeve automatically engages with the bushing to hold it in the correct position on the mandrel during installation. This self-acting retention mechanism eliminates the need for manual holding by the installer, maintaining precise positioning control while simplifying the operation and reducing installation time
4Productivity
If misalignment occurs during installation, then side loads are applied to the mandrel, but this leads to excessive wear and part failure
Solution Approach 1:
The rotatable nose cap allows dynamic alignment adjustment during the installation process. By rotating the nose cap to match the hole angle, the mandrel can be properly aligned with the hole axis, preventing misalignment-induced side loads that would cause excessive wear and part failure, thereby maintaining both installation speed and mandrel durability
Data Source
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Figure 1B
Figure 1C
AI summary
Self-aligning tools may be used to install and reposition an expandable structure in a workpiece. A self-aligning installation system (100) may include an expansion mandrel (120), self-aligning nose cap assembly (110), and an installation tool (104) for driving the mandrel. The expansion mandrel is sized to fit within a passageway of an expandable member such that the expandable member radially expands when the expansion mandrel is moved through the passageway. The self-aligning nose cap assembly (110) moves relative to the installation tool (104) and mandrel (120). A self-aligning seating system can be used to move the installed expandable member. The self-aligning seating system includes a seat backing, a seat base, and a pull rod coupled to the seat backing and extending through the seat base. The seat backing slidably engages the seat base to permit rotation of the pull rod.