Friction Stir Welding Tool for Complex Plate Shaping
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Solution Overview
Problem
Existing methods for forming complex shapes on metallic plates, such as stamping and deforming, face inefficiencies and structural issues like bending and warping, especially when dealing with large plates, due to high stamping forces and uneven heating processes.
Innovation Solution
The friction stir welding method employs a cylindrical joining tool with a flat friction surface and slots to agitate and form protrusions on a workpiece, using a mold with cutouts to guide material flow and reduce the need for excessive force, allowing for precise shaping and large-scale production with minimal material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stamping method is used to form complex shapes on metallic plates, then production efficiency is improved, but strong stamping force is needed which causes plate bending and warping
Solution Approach 1:
The patent replaces the traditional stamping mechanical system with a friction stir welding system. Instead of using strong stamping force to deform the plate, a rotating tool with mixing pin creates friction heat to locally soften the material, allowing mold patterns to be transferred without excessive force. This substitution of mechanical deformation with thermomechanical processing resolves the contradiction between production efficiency and force requirements.
Solution Approach 2:
The patent changes the physical state of the plate by applying localized heat through friction, transitioning the material from a hard, deformable state to a softened, more formable state. This parameter change (temperature increase) allows mold patterns to be transferred with minimal force, eliminating the bending and warping issues associated with high-force stamping while maintaining high production efficiency.
2Force
If heating process is applied to entire plate to decrease stamping force requirement, then force requirement is reduced, but it is inconvenient for large sized plates and causes plate expansion and internal stresses
Solution Approach 1:
The patent applies heating locally rather than globally by concentrating friction heat generation at the specific contact point between the rotating tool and the plate surface. This localized thermal processing allows the material to be softened only where needed for pattern transfer, avoiding the complexity of heating entire large plates and preventing unwanted thermal expansion and internal stresses in unaffected areas.
3Shape
If cutting method is used to remove material and form complex shapes, then product shape complexity is improved, but production efficiency is reduced
Solution Approach 1:
The patent changes the material state through localized friction heating, transforming it from a solid state requiring cutting removal to a softened state that can be directly formed by mold pressure. This parameter change enables complex shapes to be created by adding and forming material rather than removing it, dramatically improving production efficiency while maintaining shape complexity capabilities.
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 method enables efficient formation of complex shapes on large plates with reduced material deformation and stress, requiring lower driving forces and allowing for precise machining and pattern creation, while maintaining high production efficiency.
Implementation Method 1
the friction surface of the joining tool resists a treatable layer of a workpiece; the joining tool rotates and moves to agitate parts of the workpiece
Data Source
AI summary
A friction stir method includes providing a joining tool, a mold comprising a top surface and a cutout defined from the top surface, and a workpiece comprising a treatable layer and arranged on the top surface of the mold. The joining tool resists the workpiece, and rotates and moves to agitate the treatable layer of the workpiece along an extending direction of the cutout of the mold, until a protrusion integrated with the workpiece is formed in the cutout of the mold.