Screw With Segmented Threads And Cutting Units
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Solution Overview
Problem
Conventional screws face inefficiencies due to enhanced drilling resistance and fiber entanglement, which hinder screwing efficiency and lead to laborious operations and potential object cracking.
Innovation Solution
The screw design incorporates a leading threaded section and cutting units positioned in a valley between the first and leading threaded sections, allowing for effective fiber severance and chip evacuation, reducing friction and drilling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the threaded section continuously presses the object during screwing, then the screw can thread into the object, but the drilling resistance increases and screwing efficiency worsens
Solution Approach 1:
The threaded section is divided into a leading threaded section and a first threaded section separated by a valley. The leading threaded section performs cutting action while the first threaded section provides threading, separating the pressing and cutting functions to reduce drilling resistance and improve screwing efficiency.
2Productivity
If the threaded section cuts the object to thread the shank, then the screw can engage the object, but fibers entangle around the shank and worsen screwing efficiency
Solution Approach 1:
The valley structure extracts and removes cut chips and severed fibers from the screwing path during the screwing operation. By providing a dedicated space for chip accumulation and removal, the valley prevents fiber entanglement around the shank and maintains consistent screwing efficiency.
3Productivity
If the screw keeps moving downwards and squeezing cut chips, then the screw threads into the object, but the object may crack
Solution Approach 1:
The leading threaded section performs preliminary cutting action before the first threaded section engages. This preliminary cutting separates fibers and creates a cleaner path, preventing fiber entanglement that would otherwise require excessive downward pressure and cause object cracking.
4Speed
If the threaded section presses fibers while screwing, then the screw engages the object, but friction increases and drilling speed decreases
Solution Approach 1:
By segmenting the threaded section into leading and first threaded sections with a valley in between, the cutting action is separated from the threading action. This reduces continuous friction on fibers, maintaining lower friction levels and higher drilling speed throughout the screwing operation.
Data Source
Figure 1
Figure 2~2A
Figure 3~3A
AI summary
A screw (3) includes a shank (32), a head (31) connected thereto, a drilling portion (33) opposite to the head (31), a first threaded section (34) spirally formed on the shank (32), and a leading threaded section (35) spirally extending upwards from the drilling portion (33). The two threaded section (34, 35) are disconnected so that a valley (321) is formed between them. At least one cutting unit (36) protrudes from the valley (321) and has two ends connected to the first threaded section (34) and the leading threaded section (35) respectively. The leading threaded section (35) assists the drilling portion (33) in cutting and drilling into an object (4) while screwing, and the cutting unit (36) protruding from the valley (321) severs fibers which are not cut by the leading threaded section (35) completely to prevent the entanglement of the fibers. The valley (321) helps accommodate and evacuate cut chips. Therefore, the drilling resistance is reduced effectively to increase the screwing efficiency.