Rivet Screw Drill Piercing High-Tensile Steel
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Solution Overview
Problem
Existing fastening methods, such as FDS (Flow Drill Screw), require pre-drilling holes in high-tensile steel sheets, increasing manufacturing costs and reducing productivity due to limitations in piercing characteristics.
Innovation Solution
A rivet screw drill with a head portion, fastening portion, and perforating portion, featuring a mounting protrusion with radially disposed support ends and a Reuleaux triangle cross-section, which enhances piercing characteristics and joining strength without the need for pre-drilling, using a fastening tool to rotate and pressurize the drill for frictional deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If FDS (Flow Drill Screw) is used for fastening panels, then joining capability is achieved, but pre-drilling is required for high-tensile steel sheets which increases manufacturing costs and reduces productivity
Solution Approach 1:
The invention merges the piercing function and fastening function into a single integrated rivet screw drill component. The drill bit with cutting edges is combined with the threaded fastening portion, allowing the tool to both pierce through high-tensile steel sheets and create threaded holes in one operation, eliminating the need for separate pre-drilling processes and improving productivity
Solution Approach 2:
The rivet screw drill is segmented into distinct functional zones: a piercing portion with cutting edges for penetrating the panel, a transition portion for friction stir processing, and a fastening portion with external threads. This segmentation allows each zone to perform its specific function optimally while working together as an integrated system
2Ease of manufacture
If FDS is used for joining dissimilar materials, then fastening is achieved, but design freedom is limited due to various melting temperatures
Solution Approach 1:
The invention replaces thermal joining processes (which are limited by melting temperatures of dissimilar materials) with a mechanical joining approach using friction stir processing and cold-forming. The mechanical action of the rotating drill bit creates friction heat locally for material softening without requiring bulk melting, enabling joining of dissimilar materials with different melting points and greater design freedom
3Reliability
If pre-drilling processes are added to improve piercing characteristic, then piercing capability is enhanced, but manufacturing costs increase and productivity deteriorates
Solution Approach 1:
The piercing function and fastening function are merged into a single integrated rivet screw drill component. The drill bit with cutting edges is combined with the threaded fastening portion, allowing the tool to both pierce through high-tensile steel sheets and create threaded holes in one operation, eliminating the need for separate pre-drilling processes and improving productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rivet screw drill enhances productivity by eliminating the need for pre-drilling and improves the piercing and joining strength of dissimilar materials like aluminum and steel without additional processes.
Implementation Method 1
pressurizing and penetrating the panels by rotation according to operation of the fastening tool
Implementation Method 2
using a fastening tool to rotate and pressurize the drill for frictional deformation
Data Source
AI summary
A rivet screw drill for fastening at least two panels, the rivet screw drill includes a head portion mounted to a fastening tool, a fastening portion integrally formed with the head portion and of which a screw thread is formed thereto and a perforating portion integrally formed with the fastening portion and pressurizing and penetrating the panels by rotation according to operation of the fastening tool, wherein a mounting protrusion, connected to the fastening tool, is protruded from the head portion and a plurality of support ends are formed to the mounting protrusion.