Ball Screw Friction Bit Joining for Precise Low-Oxidation Welds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spot-welding techniques often fail to effectively join difficult materials like aluminum alloys, titanium alloys, and high-strength steels, and can introduce chemical changes or excessive heat-induced oxidation, while standalone friction bit joining systems are costly and lack stability.
Innovation Solution
A friction bit joining system incorporating a ball screw with internal and external threads, a chuck and spindle configuration, and a support frame with guiderails, allowing for precise axial movement and rotation of the friction bit joining bit, reducing costs and enhancing stability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional spot-welding techniques are used to join difficult materials like aluminum alloys, titanium alloys, and high-strength steels, then the joining process is simple and fast, but the weld strength is insufficient and chemical changes or excessive heat-induced oxidation occur
Solution Approach 1:
The invention changes the thermal parameters of the welding process by using friction bit joining instead of conventional spot-welding. The frictional heat generation is controlled through bit rotation speed and plunge depth, allowing the material to be softened without melting, thereby avoiding oxidation and chemical changes while achieving strong welds in difficult materials like aluminum alloys, titanium alloys, and high-strength steels
Solution Approach 2:
The invention replaces the electrical resistance heating mechanism of conventional spot-welding with a mechanical friction-based heating system. A rotating bit is plunged into the overlapping workpieces, generating frictional heat that softens the material for joining without the excessive heat and combustion products associated with conventional methods
2Manufacturing precision
If standalone friction bit joining systems are used to achieve precise axial movement and rotation control, then weld quality improves, but system cost increases
Solution Approach 1:
The invention segments the friction bit joining system into modular functional components: a ball screw mechanism for precise axial movement, a spindle system for rotation control, and a support frame with guiderails for stability. This modular segmentation allows for optimized manufacturing of individual components while maintaining overall system precision and reducing total system cost compared to standalone systems
3Measurement precision
If a ball screw mechanism is used to achieve precise axial movement of the friction bit joining bit, then positioning accuracy improves, but device complexity increases
Solution Approach 1:
The ball screw mechanism serves multiple functions simultaneously: it provides precise axial movement control, maintains positioning accuracy during the joining process, and integrates with the spindle system for coordinated rotation and plunge operations. This multi-functionality reduces the need for separate positioning mechanisms, thereby managing device complexity while maintaining high positioning accuracy
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 system enables efficient and cost-effective friction bit joining of various materials, including dissimilar metals, with reduced oxidation and chemical changes, producing strong welds and improving joining techniques.
Implementation Method 1
a ball screw having an internal bore through the ball screw and external threads
Implementation Method 2
Frictional heat is generated between the bit and the workpieces, which may facilitate plasticizing or melting of the material to be joined
Implementation Method 3
Ball bearings may be positioned between the external threads of the ball screw and the internal threads of the ball screw holder
Implementation Method 4
The at least one guiderail may be slidably coupled to the support frame
Data Source
AI summary
The disclosed friction bit joining systems may include a ball screw having an internal bore, a chuck and spindle configured to be rotated by a chuck spindle motor, a friction bit joining bit held by the chuck, a support frame, and a chuck driver motor positioned and configure to rotate the ball screw to axially move the chuck and the friction bit joining bit relative to the support frame. At least a portion of the spindle may be positioned within the internal bore of the ball screw. Various other related systems and methods are also disclosed.