Self-Drilling Screw Chip Flute Structure for Smooth Chip Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional self-drilling screws face issues with chip removal due to misalignment of chip flutes, leading to blocked chips and increased wear on the drill tail from excessive force required to continue drilling.
Innovation Solution
The self-drilling screw design incorporates two chip flutes at different positions that communicate with each other, forming a connection at the joint between the drill bit and drill tail sections, with the first chip flute width being less than or equal to half the screw rod diameter and the second chip flute width being greater, ensuring effective chip discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single chip flute is used in conventional self-drilling screws, then the structure is simple, but chip removal is blocked due to misalignment between drill tail chip flute and rod body chip flute
Solution Approach 1:
The chip flute is divided into two separate components: a first chip flute formed on the rod body and a second chip flute formed on the drill tail. These two segmented flutes align and connect with each other during assembly, creating a continuous chip removal pathway that solves the misalignment problem of conventional single flutes while maintaining manufacturing simplicity.
Solution Approach 2:
The rod body acts as an intermediary component that connects the drill tail and the screw thread section. The first chip flute on the rod body serves as a mediator channel that receives chips from the second chip flute of the drill tail and transports them to the exterior, ensuring continuous chip flow despite the segmented structure.
2Productivity
If greater rotational force is applied to continue drilling when chips are blocked, then drilling can proceed, but the drill tail wears down quickly
Solution Approach 1:
The harmful factor of chip blockage is extracted and eliminated by designing the connected dual chip flutes to provide a clear, unobstructed chip removal pathway. Chips are continuously extracted from the drilling zone through the coordinated action of both flutes, preventing accumulation that would otherwise require excessive force to remove.
Solution Approach 2:
The connected chip flute system ensures continuous chip removal throughout the drilling process. The first and second chip flutes work in continuous sequence, maintaining an uninterrupted flow path that prevents chip accumulation and allows drilling to proceed smoothly without intermittent stops or increased force requirements.
Data Source
AI summary
A self-drilling screw structure comprises a screw head and a screw rod extending outwardly from the screw head. The screw rod is formed with a drill bit section at one end opposite to the screw head, a drill tail section and a screw thread section. The drill bit section comprises two first cutting edges extending helically and intersecting at a chisel edge. Two first chip flutes located at the positions respectively between the two first cutting edges and extending from the chisel edge toward the drill tail section. The drill tail section comprises two second cutting edges extending helically toward the screw thread section. Two second chip flutes located at the positions respectively between the two second cutting edges and extending helically toward the screw thread section. Each first chip flute and the second chip flute form a connection at joint between the drill bit and drill tail sections.