Friction Stir Welding Tool-In-Tool Spindle Design
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Solution Overview
Problem
Existing friction stir welding machines face challenges with maintaining tight tolerances between the pin and shoulder tools, leading to inaccurate welds and inefficient tool changes, due to poor run-out tolerance and slow, costly tool replacement processes.
Innovation Solution
A novel tool-in-tool holding system with a coaxial electro-mechanical spindle design, using separate standard tool holders for the pin and shoulder tools, allowing for independent rotation and axial movement, which reduces run-out and facilitates faster, more accurate tool changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pin and shoulder tools are mounted together in a single spindle assembly, then the tool structure is simplified, but the run-out tolerance deteriorates and welding precision decreases
Solution Approach 1:
The welding tool assembly is segmented into two independently mounted components: a pin tool mounted in a first spindle assembly and a shoulder tool mounted in a second spindle assembly. This segmentation allows each component to be precisely positioned and controlled independently, eliminating the run-out tolerance issues that occur when both components are mounted together in a single spindle. The first and second spindle assemblies can be independently adjusted to achieve optimal alignment and minimal run-out for each tool component.
2Device complexity
If the pin and shoulder tools are mounted together in a single spindle, then the number of spindles is reduced, but the time required for tool changes increases
Solution Approach 1:
The tool mounting system is segmented into separate spindle assemblies for the pin tool and shoulder tool. This allows independent mounting and removal of each tool component without requiring disassembly of a combined tool assembly. The pin tool can be quickly changed by removing it from the first spindle assembly, and the shoulder tool can be independently changed by removing it from the second spindle assembly, significantly reducing tool change time compared to a single integrated spindle configuration.
Solution Approach 2:
The spindle assemblies are designed with dynamic, easily adjustable mounting mechanisms that allow rapid tool changes. The first and second spindle assemblies can independently accommodate different pin and shoulder tool configurations, enabling quick reconfiguration for different welding operations without requiring complete tool assembly disassembly or complex adjustment procedures.
3Adaptability or versatility
If standard tool holders are used for pin and shoulder tools, then tool holder availability increases, but the run-out tolerance between pin and shoulder deteriorates
Solution Approach 1:
The system uses separate standard tool holders for the pin tool and shoulder tool, each mounted in its own independently controllable spindle assembly. This segmentation allows the use of readily available standard tool holders while maintaining precise control over the relative positioning of the pin and shoulder tools. The independent spindle assemblies can be adjusted to compensate for any variations in standard tool holder accuracy, ensuring minimal run-out tolerance and precise tool alignment.
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
This solution achieves tighter welding tolerances, reduces wear on spindles, decreases man-hours, and enhances the predictability and accuracy of friction stir welds, while minimizing downtime and increasing production efficiency.
Implementation Method 1
The rotation of the tool shoulder surface and pin generates friction heat in the joint. The friction heat generated causes the metal along the joint to soften without reaching the melting point of the metal.
Data Source
AI summary
A friction stir welding apparatus has a novel tool-in-tool construction where a friction stir welding pin tool extends through a center bore of a friction stir welding shoulder tool and is moveable axially and rotationally relative to the shoulder tool. The pin tool and shoulder tool both have their own dedicated tool holders and spindles that enable the tools to rotate and move axially relative to each other and enable easy replacement of each of the tools.