Screw Cutting Edge Design for Efficient Debris Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional screws face issues with efficiently severing fibers and expelling debris during fastening, leading to increased resistance and potential protrusion of the screw head due to accumulated debris, which hinders smooth operation and fastening efficiency.
Innovation Solution
The screw design features two inclined cutting planes with a positioning member and threaded units that extend to a cutting edge, allowing for stable positioning and efficient debris removal through channels between the threads, reducing screwing torque and enhancing speed by guiding debris away from the screwing area.
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 fibers are not efficiently severed and debris accumulates increasing resistance
Solution Approach 1:
The drilling portion transitions from a simple tapered shape to include cutting planes with specific geometric parameters (inclination angles, edge sharpness) that enable efficient fiber severing. This parameter change allows the drilling portion to both enter the object smoothly and cut fibers effectively, reducing debris accumulation and maintaining screwing speed.
Solution Approach 2:
The drilling portion is segmented into multiple functional zones: a tapered leading end for initial penetration, followed by cutting planes with cutting edges for fiber severing, and channels for debris removal. This segmentation allows each zone to perform its specific function optimally, resolving the contradiction between entry ease and cutting efficiency.
2Productivity
If debris is not timely expelled, then screwing resistance increases, but adding debris removal structures may complicate the design
Solution Approach 1:
The debris removal channels are merged with the threaded units structure. The channels are formed as integral parts of the threading geometry, using the same material and manufacturing process. This merging eliminates the need for separate debris removal components while maintaining effective debris expulsion functionality.
Solution Approach 2:
The threaded units serve multiple functions: fastening the screw to the object and simultaneously acting as debris removal channels. The grooves between threads that would normally just be empty spaces are utilized as functional channels for debris evacuation, making the structure multi-functional and reducing overall complexity.
3Reliability
If the screw is disposed tilting to prevent rustiness, then water drainage is improved, but debris may cause the head portion to bulge out
Solution Approach 1:
The cutting planes and cutting edges perform preliminary fiber severing before the threaded units engage the object. This preliminary action prevents fibers from becoming tangled and pushing against the head portion during tilted insertion, ensuring stable embedding even when the screw is installed at an angle for water drainage.
Data Source
AI summary
A screw includes a positioning member defined on inclined cutting planes of a drilling portion of the screw for stably allowing a cutting edge constructed at a convergence of the cutting planes to cut efficiently. A threaded section formed on a shank of the screw is extended toward the cutting edge and connected with one end of the cutting edge. The positioning member helps the screw fixedly stand on an object. The cutting edge and the cutting planes allow cutting debris to be swiftly and smoothly extruded therefrom into the threaded section for avoiding the piling of the considerable cutting debris. 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.