Versatile Screw Drill Tip Structure for Low-Resistance Cutting
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Solution Overview
Problem
Conventional screws face limitations in cutting efficiency, chip removal, and resistance during drilling, leading to potential workpiece cracking and deviation of the screw tip.
Innovation Solution
A versatile screw design featuring a drill portion with two opposite groove regions and a drill thread unit, where the groove regions have cutting rib portions and accommodation areas for chip removal, and the drill thread segments are situated beside the cutting rib portions to enhance cutting and pulling forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single groove is formed on the shank, then the screw structure is simple, but the cutting effect is limited and chip removal is inefficient
Solution Approach 1:
The single groove on the shank is segmented into multiple groove regions (first groove region and second groove region) with different functions. The first groove region focuses on chip accommodation while the second groove region emphasizes cutting, allowing each segment to optimize its specific function rather than a single groove attempting to do both poorly.
Solution Approach 2:
Different portions of the groove structure are given different local qualities - the first groove region has characteristics optimized for chip accumulation and removal, while the second groove region has characteristics optimized for cutting action. This local differentiation resolves the contradiction by allowing each region to excel at its specific function.
2Productivity
If the groove area is small, then the screw structure is compact, but chip accumulation blocks the groove and increases drilling resistance
Solution Approach 1:
The groove is divided into multiple functional segments that handle chip management at different stages of the drilling process. This segmentation allows chips to be efficiently removed throughout the drilling operation rather than accumulating in a single location, maintaining drilling speed without requiring an excessively large overall groove structure.
Solution Approach 2:
The groove structure extends in multiple dimensions along the shank length and cross-section, creating a three-dimensional chip management system rather than a simple linear groove. This multi-dimensional approach increases chip capacity and removal efficiency without significantly increasing the overall footprint or complexity of the screw design.
3Reliability
If the tip area is small, then the screw structure is simple, but the bearing force area is small causing tip deviation
Solution Approach 1:
The tip structure is segmented into multiple functional elements including a cutting tip portion and a bearing portion with increased area. This segmentation allows the tip to simultaneously provide precise positioning through the bearing area while maintaining cutting effectiveness through the cutting portion, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The enlarged bearing force area at the tip performs preliminary positioning and force distribution before the main threading action begins. This preliminary action prevents tip deviation by establishing proper alignment and force distribution early in the drilling process, ensuring reliable operation throughout subsequent drilling.
Data Source
AI summary
A versatile screw includes a head, a shank, a thread unit, and a drill portion. The drill portion includes a drill body on which two opposite groove regions and a drill thread unit can be arranged. The drill body defines a drilling section. Each groove region includes at least one wall joined to the drilling section, an accommodation area enclosed by the wall, and a cutting rib portion protruding from the wall. The drill thread unit is spirally disposed on the drilling section and partially cut by the groove regions, thereby forming at least two drilling thread segments. The cutting rib portions cooperate with the drilling thread segments to assist the drilling section in reaming and generating downward pulling force, thereby executing an efficient drilling operation capable of attaining a stable initial-cutting effect, decreasing the drilling resistance and preventing the cracking problem of a workpiece.