Drilling Screw With Segmented Cutting Edge And Debris Channels
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Solution Overview
Problem
Conventional screws face difficulties in rapidly drilling and cutting through materials like plywood, leading to increased resistance and potential breakage due to debris accumulation, and are prone to rust and abnormal operation when debris is not expelled timely.
Innovation Solution
A screw design featuring a drilling portion with two inclined cutting planes and a tapered positioning member that divides the cutting edge into dual sub cutting edges, along with guiding channels and auxiliary threaded units, allowing for stable positioning, efficient debris removal, and reduced screwing torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional screw with 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, causing increased resistance and potential breakage
Solution Approach 1:
The drilling portion is segmented into multiple functional elements: a tapered positioning member for initial penetration, dual inclined cutting planes for fiber severing, and threaded units with guiding channels for debris removal. This segmentation allows each element to perform its specific function effectively, resolving the contradiction between penetration capability and debris expulsion.
Solution Approach 2:
The inclined cutting planes act as intermediaries between the tapered positioning member and the threaded units. They receive the positioning member's penetration force and transform it into cutting action that completely severs fibers, while also guiding debris toward the threaded units for expulsion. This intermediary function resolves the contradiction by ensuring complete fiber severing without compromising debris removal.
2Object-affected harmful factors
If the screw is disposed tilting to prevent rustiness on the head portion, then rust protection is improved, but debris accumulation still causes abnormal operation and head bulging
Solution Approach 1:
The harmful factor of debris accumulation is extracted and removed from the system through the guiding channels in the threaded units. These channels actively channel debris away from the screw body and head portion, preventing the debris-induced abnormal operations and head bulging that would otherwise occur during tilted screwing operations.
3Productivity
If the cutting edge is designed to sever fibers completely, then cutting effectiveness is improved, but the complexity of the drilling portion increases
Solution Approach 1:
Multiple functions are merged into the drilling portion: the tapered positioning member provides penetration guidance, the inclined cutting planes perform fiber severing, and the threaded units with guiding channels handle debris removal. This merging of functions into a single integrated drilling portion achieves complete fiber severing without requiring separate components, thus improving cutting efficiency while controlling structural complexity.
Data Source
AI summary
A screw capable of drilling and cutting includes two inclined cutting planes with a cutting edge formed on a convergence of the cutting planes. A tapered positioning member extends from the convergence of the cutting planes, where the cutting edge is divided into dual sub cutting edges by means of the positioning member. Each sub cutting edge has an inclined angle. An included angle included by the sub cutting edges is smaller than 180 degrees. Threads spiral on a shank and extend to the sub cutting edges. Setting the positioning member against on an object permits a steady performance during the first stage of screwing. Subsequently, the sub cutting edges provides a scraping effect on the object during drilling. Torque is reduced and drilling speed is promoted.