Segmented Cutting Edge Screw for Rapid Drilling and Low Torque
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Solution Overview
Problem
Conventional screws face difficulties in rapidly drilling and cutting through materials like plywood, leading to increased screwing torque and debris accumulation, which can break the object and hinder further fastening due to inefficient fiber severing and debris expulsion.
Innovation Solution
The screw design features two inclined cutting planes with a tapered positioning member that divides the cutting edge into dual sub cutting edges, providing stable positioning and guiding debris into channels for efficient expulsion, reducing torque and enhancing screwing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a tapered drilling portion is used to pierce the object, then the screw can enter the object, but the fibers are not completely severed and debris accumulates increasing resistance
Solution Approach 1:
The drilling portion is segmented into multiple functional zones: a tapered positioning member for initial entry, and two inclined cutting planes with sub-cutting edges for fiber severing. This segmentation allows the screw to perform both positioning and cutting functions effectively, preventing debris accumulation while maintaining entry capability.
Solution Approach 2:
The drilling portion employs asymmetric geometry with two inclined cutting planes at different angles (first included angle less than 180 degrees, second included angle of taper). This asymmetric design creates effective cutting edges that sever fibers rather than just pushing them, resolving the contradiction between entry and fiber severing.
2Reliability
If the screw is disposed tilting to prevent rustiness, then water drainage is improved, but debris expulsion becomes difficult and the head bulges out
Solution Approach 1:
The drilling portion extends beyond the simple tapered tip into a multi-planar cutting structure with inclined planes. This dimensional extension creates channels and pathways that facilitate debris expulsion even when the screw is tilted, while the tapered positioning member maintains the ability to prevent rustiness through proper orientation.
3Ease of manufacture
If conventional drilling portion design is used, then manufacturing is simple, but screwing torque increases due to debris accumulation
Solution Approach 1:
The drilling portion is divided into manufacturable segments: a tapered positioning member and two inclined cutting planes. This segmentation allows each component to be manufactured using standard processes while the combined structure achieves low torque through effective fiber severing and debris expulsion.
4Device complexity
If the cutting edge is not divided, then the structure is simpler, but debris cannot be guided into channels for efficient expulsion
Solution Approach 1:
The cutting edge is segmented into dual sub-cutting edges formed by two inclined cutting planes. This segmentation creates natural channels between the planes that guide debris toward expulsion pathways, improving debris removal efficiency without excessive complexity.
Solution Approach 2:
The inclined cutting planes act as intermediaries that channel debris from the cutting zone toward expulsion pathways. These planes mediate between the fiber severing action and debris removal, creating efficient debris guidance without complex additional components.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A screw (3) capable of rapidly drilling and cutting includes two inclined cutting planes (331) with a cutting edge (332) formed on a convergence of the cutting planes (331). A tapered positioning member (333) is extended from the convergence of the cutting planes (331), so that the cutting edge (332) is divided into dual sub cutting edges (3321) by means of the positioning member (333) . Each sub cutting edge (3321) is defined with a certain inclined angle. An included angle ( ¸ 1) included by the sub cutting edges (3321) is smaller than 180 degrees. A plurality of threads (34) spiraling on a shank (31) of the screw (3) further extend to the sub cutting edges (3321) . Setting the positioning member (333) against on an object provides the screw (3) with a steady performance at the first stage of screwing. Subsequently, the sub cutting edges (3321) provides a favorable scraping effect on the object in time of drilling. Thereby, the screwing torque is reduced and the drilling speed is promoted. Preferably, the fastened screw is sunken in the object, and the fastening operation is completed successfully.