Rail Vehicle Bow Wall Automatic Welding via Recessed Z-Profile Joints
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Solution Overview
Problem
The existing methods for manufacturing large components of rail vehicles, such as side walls, are time-consuming and expensive due to the need for manual weld seam production and lack of rust protection, especially in conventional steel, which results in cavities that cannot be protected against rust.
Innovation Solution
A bow wall constructed from longitudinal members with a hat-shaped profile and cross members with a Z-shaped profile, featuring recesses at connection points for collision-free penetration and automatic welding, ensuring no gaps and complete rust protection by prestressing the longitudinal members, allowing for uniform thickness and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual welding is used for connection points, then weld quality can be maintained despite tolerances and distortion, but production time and cost increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-leveling the bow wall structure in a dedicated leveling device before welding. This preliminary leveling compensates for tolerances and potential distortion, enabling subsequent automatic welding without compromising weld quality. The structure is prepared in advance to eliminate the need for manual welding adjustments during assembly.
Solution Approach 2:
The patent replaces manual welding operations with automatic welding systems. By implementing precise positioning and preliminary leveling, the system substitutes human-operated welding processes with automated welding machines, thereby reducing production time while maintaining weld seam quality through consistent automated control.
2Ease of manufacture
If conventional steel is used for bow wall construction, then material availability and cost are improved, but rust protection becomes problematic due to inaccessible cavities
Solution Approach 1:
The patent extracts or eliminates the problematic cavities that trap moisture and prevent rust protection. By redesigning the connection geometry between longitudinal and cross members, the structure avoids enclosed cavities, allowing conventional steel to be fully protected against rust through accessible surface treatments and coatings.
Solution Approach 2:
The patent achieves homogeneous material properties throughout the structure by ensuring complete rust protection of all steel surfaces. The design allows uniform application of protective coatings across all steel surfaces, eliminating localized vulnerability points where rust could initiate and spread.
3Device complexity
If Z-shaped profiles are welded without recesses, then structural simplicity is maintained, but collision-free penetration and automatic welding become impossible
Solution Approach 1:
The patent applies segmentation by introducing recesses into the Z-shaped profiles at connection points. These recesses segment the continuous profile into functional zones: the main structural portion maintains its simple Z-shape, while the recessed areas provide precise mating surfaces for collision-free penetration and automatic welding positioning.
Solution Approach 2:
The recesses act as intermediary elements that facilitate the connection between longitudinal and cross members. These recessed portions serve as mediators that enable precise alignment and collision-free penetration, allowing automatic welding systems to operate effectively without compromising the overall simplicity of the Z-shaped profile design.
4Ease of operation
If bow wall is constructed without prestressing, then assembly simplicity is maintained, but automatic welding suffers from disruptive gaps between components
Solution Approach 1:
The patent applies preliminary anti-action by pre-appling prestressing forces to the bow wall structure during assembly. This preliminary action counteracts the tendency for gaps to form between components, ensuring that longitudinal and cross members are held in precise contact positions ready for automatic welding, thereby eliminating disruptive gaps without complicating the assembly process.
Data Source
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AI summary
The invention relates to a large component for rail vehicles, especially for side panels, comprising a roof arch side panel constituted of longitudinal girders (1) and transverse girders (2) and a planking (4), wherein the connection points between the longitudinal girders (1) and the transverse girders (2) can be automatically welded and the entire surface of the large component can be rust-proofed.