Sleeve Extraction Jig with Tapered Thread for FRP Panel Protection
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Solution Overview
Problem
Existing sleeve-component extracting devices damage the internal wall of fiber-reinforced plastic panels when extracting sleeve components, leading to increased maintenance costs due to the need for larger insertion holes and reduced recyclability of panels.
Innovation Solution
A sleeve-component extracting jig with a helical thread and taper surfaces, featuring clearance grooves that form cutting edges to engage with the sleeve component without excessively digging into the panel, allowing for reliable extraction while minimizing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat part is provided at the leading end of a thread to prevent excessive digging into the sleeve component, then the thread digging into the sleeve component is prevented, but the internal wall of the insertion hole is damaged via pressing of the flat part against the sleeve component
Solution Approach 1:
The harmful flat part is removed from the thread structure. Instead of modifying the thread to include a flat part, the invention extracts this problematic element entirely and replaces it with a thread design that has reduced digging capability through modified thread geometry (smaller lead angle and optimized crest shape), thereby preventing both excessive digging into the sleeve and damage to the insertion hole wall.
Solution Approach 2:
The thread is designed with non-uniform local properties: the thread crest has a specific radius of curvature and the lead angle varies along the thread length. This local quality optimization allows the thread to engage reliably with the sleeve component's internal threads while minimizing the digging effect that causes damage to the insertion hole wall.
2Productivity
If the internal wall of the insertion hole is damaged by extraction operation, then the sleeve component can be removed, but the insertion hole needs to be increased in diameter to remove damages, decreasing recycle times
Solution Approach 1:
The thread geometry is preliminarily designed to prevent damage before it occurs. By optimizing the lead angle and thread crest radius, the extraction force is distributed more evenly, preventing the concentrated stress that would damage the insertion hole wall. This preliminary anti-action preserves the panel for multiple recycling cycles.
Solution Approach 2:
The invention changes critical geometric parameters of the thread, specifically reducing the lead angle and optimizing the thread crest radius. These parameter changes transform the extraction mechanism from one that concentrates force and causes damage to one that distributes force evenly, enabling repeated extraction operations without compromising panel integrity.
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 jig enables reliable extraction of sleeve components from fiber-reinforced plastic panels while preventing damage to the internal wall of the insertion hole, reducing maintenance costs and extending panel recyclability.
Implementation Method 1
a helical thread formed on an outer circumferential surface of a shaft body with a constant diameter, wherein the thread is engageable with an inner circumferential surface of the sleeve component
Implementation Method 2
taper surfaces configured by cutting off crests of the thread to lower the height of the thread toward a leading end of the engagement part
Implementation Method 3
a plurality of clearance grooves open at the leading end of the engagement part and placed at equal angular intervals in a circumferential direction of the engagement part
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A sleeve-component extracting jig according to the present invention is configured to include an engagement part on which a thread engageable with an inner circumferential surface of a sleeve component is formed, wherein a taper surface configured by cutting off crests of the thread to lower a height of the thread toward a leading end of the engagement part, and a plurality of clearance grooves open at the leading end of the engagement part and arranged at equal angular intervals in a circumferential direction of the engagement part are formed in the engagement part, a length of a radius of the engagement part at an end position of the taper surface is a sum of a length obtained by multiplying a thickness of the sleeve component by a digging ratio and a length of an inside diameter of the inner circumferential surface of the sleeve component, and the digging ratio has a value in a range between 20% and 60%.