Bellows Electrode Tracking for Fast Resistance Projection Welding
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Solution Overview
Problem
Resistance projection welding faces challenges in applying sufficient force while ensuring precise tracking of the welding electrode, as excessive initial force can flatten the welding boss, leading to incomplete welds, and delayed repositioning can result in unwanted spatter or incorrect welding.
Innovation Solution
A tracking device utilizing a pistonless bellows cylinder with a linearly movable stamp and roller bearings for minimal friction, allowing for quick and precise adjustment of the welding electrode, supported by a housing with a bellows cylinder that provides a small stroke for tracking and a linear drive for delivery, ensuring consistent and reproducible welding results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston pneumatic cylinder is used for tracking the welding electrode, then the structure is more stable, but the response time is slower and the design is more complex
Solution Approach 1:
The invention extracts and removes the piston component from the traditional pneumatic cylinder, creating a pistonless bellows cylinder. This extraction eliminates the piston rod and packing gland that create friction and inertia, thereby reducing response time while maintaining structural stability through the bellows' flexible yet controlled expansion and contraction.
Solution Approach 2:
The invention uses pneumatic pressure to directly expand and contract the bellows cylinder, eliminating the need for mechanical pistons. The pneumatic force acts directly on the bellows structure, providing rapid response and smooth motion control for tracking the welding electrode during the welding process.
2Force
If a piston pneumatic cylinder is used for tracking the welding electrode, then the force application is more controlled, but the device complexity increases
Solution Approach 1:
By removing the piston, piston rod, and associated sealing mechanisms from the pneumatic cylinder, the invention significantly simplifies the device structure. The pistonless bellows cylinder achieves force control through the bellows' inherent mechanical properties and pneumatic pressure, eliminating complex moving parts while maintaining controlled force application.
Solution Approach 2:
The bellows cylinder uses a flexible bellows structure instead of rigid piston components. The bellows expands and contracts in response to pneumatic pressure, providing smooth force control for tracking the welding electrode. This flexible shell design replaces complex mechanical linkages with a simpler, more elegant pneumatic-mechanical coupling.
3Force
If high force is applied at the beginning of welding, then the welding process is more robust, but the welding boss may be pressed in or flattened
Solution Approach 1:
The invention uses a dynamic tracking mechanism where the bellows cylinder continuously adjusts its extension to maintain optimal force during welding. As the welding boss melts and changes shape, the bellows dynamically adapts its position, ensuring consistent force application without excessive initial pressure that could flatten the boss, thereby maintaining both robustness and precision.
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 enhances response time and minimizes the risk of unwanted spatter by reducing moving mass and friction, achieving consistent welding quality with a simplified and cost-effective design.
Implementation Method 1
a bellows cylinder (10) which serves to ensure tracking of the welding electrode (23)
Implementation Method 2
roller bearings (7, 8) for minimal friction
Implementation Method 3
The tracking device (1) has a pneumatic drive
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Tracking device for tracking a welding electrode of a welding device for resistance welding, in particular resistance projection welding, with a housing (2) which accommodates a linearly movable punch (6) which is mounted for movement and on which an electrode holder (9) for the interchangeable arrangement of a welding electrode (23) is arranged at one end, and wherein the housing (2) further accommodates a bellows cylinder (10) which cooperates with the punch (6) at the other end of the punch (6) and is supported against an abutment (5) provided by the housing (2).