Split Thread Die Structure for Local Fastener Re-Threading
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Solution Overview
Problem
Existing re-threading dies are cumbersome as they require working down the entire thread area and must be used with the fastener in a vertical position, limiting flexibility and lubrication access.
Innovation Solution
A split thread die device comprising a first half with a female opening and male thread cutter, and a second half with a male protrusion and thread cutter, allowing secure attachment around damaged threads without starting from the end and accommodating horizontal or vertical orientations, with relief cuts for material clearance and lubricant application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a singular continuous re-threading die is used, then the device structure is simple, but it requires working down the entire thread area and must be used in vertical position
Solution Approach 1:
The re-threading die is divided into a first half and a second half that can be separated and reassembled. This segmentation allows the die to be placed around specific damaged thread areas without requiring work from the entire thread length, and enables use in both vertical and horizontal orientations, directly resolving the contradiction between operational flexibility and structural simplicity.
2Adaptability or versatility
If a singular continuous re-threading die is used, then the device structure is simple, but it requires the fastener to be in vertical position
Solution Approach 1:
By dividing the die into separable halves that can be reassembled in different orientations, the device adapts to both vertical and horizontal fastener positions. The segmented design provides the versatility needed for different orientations without requiring complex adjustment mechanisms.
3Ease of manufacture
If a singular continuous re-threading die is used, then the device structure is simple, but it is difficult to apply lubricant during re-threading
Solution Approach 1:
The segmented die structure with separable halves creates accessible openings that facilitate easy application of cutting lubricant to the re-threading area. This design improvement enhances lubrication effectiveness without requiring complex lubrication delivery systems.
4Ease of operation
If the die is split into halves, then placement flexibility is improved, but the device complexity increases
Solution Approach 1:
The die is divided into a first half and a second half that can be independently positioned and then joined together using joining features. This segmentation provides the placement flexibility to target specific damaged areas while the joining features keep the structural complexity manageable through standardized connection mechanisms.
Data Source
AI summary
A split thread die device is disclosed. The device is comprised of a first half and a second half that can be secured to each other around a damaged area of threads of a fastener. The device can then be turned to re-thread the damaged threads. In addition, a top surface of each half is comprised of an opening that extends to the inside surface of each half. The opening allows a cutting lubricant to easily flow from the top surface of each half and onto the threads of the fastener contacting the inside surfaces.