Friction Welding Mandrel with Segmented Centering Pin
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Solution Overview
Problem
Existing methods for friction-welding plate-like components require complex and costly designs, making them unsuitable for cost-effective mass production, particularly in press-based operations.
Innovation Solution
A connecting element with a short, thin centering pin protruding from the mandrel ensures precise guidance and secure connection by concentrating frictional energy at the relevant point, allowing for efficient friction-welding of plate-like components with a simple manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pointed conical shape is used for the mandrel to perform centering function, then centering precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The centering function is separated from the mandrel body and assigned to a distinct centering element. This segmentation allows the mandrel to maintain a simple cylindrical shape while the separate centering element provides the necessary centering precision, resolving the contradiction between centering accuracy and manufacturing simplicity.
Solution Approach 2:
A centering element acts as an intermediary component between the mandrel and the workpiece. This mediator performs the centering function without requiring the mandrel itself to be complex, enabling precise alignment while keeping the main mandrel structure simple and easy to manufacture.
2Manufacturing precision
If a complex mandrel design is used to ensure precise guidance, then guidance accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The guiding function is segmented from the mandrel body and implemented through a separate centering element with simple geometric features. This allows the mandrel to be manufactured as a simple cylinder while the centering element provides precise guidance, maintaining both accuracy and ease of manufacture.
Solution Approach 2:
Complex geometric features are localized to the centering element rather than the entire mandrel. The centering element incorporates specific local features (such as conical surfaces or positioning geometries) that provide guidance accuracy, while the majority of the mandrel remains a simple, easily manufactured cylinder.
3Temperature
If frictional energy is distributed over a large area, then heating efficiency is improved, but concentration of frictional energy at the penetration point deteriorates
Solution Approach 1:
The frictional heating is localized to the penetration point through the sharp centering element geometry. The concentrated contact area at the tip generates intense localized frictional heat that softens the material precisely where needed, while the rest of the mandrel does not generate excessive heat, resolving the contradiction between heating efficiency and energy concentration.
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 solution enables a secure, cost-effective friction-welded connection with precise guidance, ensuring concentrated frictional energy application and preventing the mandrel from wandering, thus facilitating continuous, efficient production.
Implementation Method 1
Due to frictional heat in the area of a mandrel, which is part of the fastener, the upper component heats up to such an extent that it melts
Implementation Method 2
The short and thin centering element reliably prevents the mandrel from wandering away from the point of use, allowing each joining process to be carried out with full concentration by the pin-shaped centering element, and ensuring that the applied frictional energy is focused exclusively on the point of penetration of the fastener
Data Source
Figure 1~7
AI summary
The invention relates to a connecting element (1) for a friction weld connection for connecting at least two plate-like components (8, 9), having a centering part (4) for centering and guiding the connecting element (1) subjected to rotation and pressure during penetration of the upper component or components (8) by a mandrel (2), the length thereof being adapted to the thickness of the upper component or components (8). The centering part protrudes as a pin (4, 13, 16, 18) from a substantially flat cross-sectional area of the mandrel transitioning into the friction weld connection and is formed so short and thin relative to the length of the mandrel that, after penetrating the upper component or components, the material of said centering part softens and the centering part thus practically completely transitions into the friction weld connection.