Self-Drilling Screw Structure for Chip Discharge Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional self-drilling screws have poor chip discharge capability and stability during hole-expanding, leading to drilling position deviations due to chip accumulation.
Innovation Solution
The self-drilling screw structure features different cutting edges formed through stamping and thread rolling methods, connected via a concave neck portion, which enhances chip discharge and stability by redirecting chips through the concave neck and drill tail chip discharge grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chip discharge grooves are stamped and molded on a flat surface perpendicular or slightly oblique to the surface, then mass production is enabled, but chip discharge capability is poor and drilling position deviation occurs
Solution Approach 1:
The chip discharge grooves are divided into multiple segments along the axial direction, with each groove having a specific length and spacing. This segmentation allows chips to be discharged through multiple pathways, improving chip discharge efficiency while maintaining manufacturing feasibility through stamping and molding processes
Solution Approach 2:
The chip discharge grooves are designed to extend in a direction that is not perpendicular or slightly oblique to the surface, but rather at optimized angles and with specific three-dimensional configurations. This dimensional optimization improves chip discharge capability while still allowing for mass production through advanced stamping and molding techniques
2Productivity
If conventional stamped self-drilling screw is used, then mass production is achieved, but chip discharge capability is poor leading to chip accumulation
Solution Approach 1:
Different regions of the screw structure have optimized local properties: the chip discharge grooves have specific cross-sectional shapes, the helical surfaces have optimized pitch and angle, and the cutting edges have precise geometries. These local quality optimizations collectively improve chip discharge capability while maintaining overall manufacturing efficiency
Solution Approach 2:
The design converts the potential harm of chip accumulation into benefit by creating grooves that actively guide and evacuate chips. The helical surfaces and groove configurations work together to transform the chip discharge process from a problematic accumulation issue into an efficient evacuation system that benefits overall drilling performance
3Productivity
If chip discharge grooves are designed for mass production, then manufacturing efficiency is improved, but chip discharge capability deteriorates causing shaking during drilling
Solution Approach 1:
The chip discharge grooves and helical surfaces are designed with dynamic characteristics that adapt to the drilling process. The groove geometry and helical parameters are optimized to work effectively during the dynamic drilling operation, improving chip discharge capability and drilling stability while maintaining manufacturing efficiency through standardized production processes
Data Source
AI summary
The invention provides a self-drilling screw structure and a manufacturing method thereof, wherein the manufacturing method includes: providing screw body, forming drill tail screw rod section, forming concave neck portion, forming drill tail cutting edge and forming thread. The self-drilling screw structure including a screw head portion and a screw rod portion, the screw rod portion is sequentially provided with a threaded screw rod section, a drill tail screw rod section and a drill bit screw rod section, the drill tail screw rod section has a rod diameter of drill tail, a plurality of drill tail cutting edges and a plurality of drill tail chip discharge grooves, the drill bit screw rod section is provided with a concave neck portion, and the drill bit screw rod section is protruded to form a plurality of drill bit cutting edges and the plurality of drill bit chip discharge grooves.