Mirror Welding Expander Ribs for Vehicle Lighting Alignment
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Solution Overview
Problem
Current mirror welding techniques for assembling lighting device components in motor vehicles face challenges such as operator fatigue and misalignment due to the heavy base's weight and difficult positioning, leading to risks of breakage and poor weld quality.
Innovation Solution
Incorporating expander ribs on the weld beads of at least one part to facilitate easier positioning and alignment during the assembly process, allowing for local expansion of the weld bead width and improved centering and spatial conformation, which are supported by tools to ensure accurate placement and secure bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual placement of heavy base and outer lens is used, then assembly flexibility is maintained, but operator fatigue increases and positioning precision deteriorates
Solution Approach 1:
The expander ribs are pre-formed on the weld beads of the base and outer lens components before assembly. These ribs automatically engage during the mirror welding process to provide inherent positioning and alignment, eliminating the need for manual conformation operations while ensuring precise weld bead alignment despite the heavy weight of the base component.
2Adaptability or versatility
If heavy base is manually handled, then assembly adaptability is maintained, but operator fatigue increases
Solution Approach 1:
The expander ribs enable the heavy base component to self-position and self-align with the outer lens during assembly. The ribs automatically engage with corresponding features on the outer lens, providing inherent guidance and positioning without requiring manual conformation operations, thereby reducing operator fatigue while maintaining assembly adaptability.
3Manufacturing precision
If manual conformation step is added, then positioning precision is improved, but assembly time increases
Solution Approach 1:
The expander ribs provide automatic positioning and alignment of the weld beads during the mirror welding process itself, eliminating the need for separate manual conformation steps. The ribs engage automatically when the base and outer lens are placed together, ensuring precise weld bead alignment while reducing overall assembly time by removing the conformation operation.
4Area of stationary object
If weld bead width is increased, then welding surface area is improved, but component complexity increases
Solution Approach 1:
The expander ribs are localized features added only to the weld bead areas of the base and outer lens components, rather than modifying the entire component geometry. This local modification increases the welding surface area where needed while keeping the rest of the components simple and maintaining overall component simplicity.
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 method reduces operator fatigue, minimizes misalignment risks, and enhances the quality of the weld by enabling easier handling and precise positioning of heavy components, resulting in improved ergonomics and reliability of the assembly process.
Implementation Method 1
each expander rib being configured in such a way as to locally expand the width of the weld bead with respect to the width of the weld bead outside the zones where the expander ribs are present
Implementation Method 2
An elongated heating element known as a mirror is introduced into this space, which provides heating on its two opposite faces... The two parts then come into contact with the mirror... until the temperature of the material has reached its softening temperature at the surface
Implementation Method 3
it is enough to remove the heating mirror and to press into contact the outer lens and the base in the area of their weld beads still in the softened state for a few seconds. After a few seconds of cooldown under pressure, the weld is achieved
Data Source
AI summary
The invention relates to a method for assembling a first and a second part of a lighting device for a vehicle by mirror welding, including a step of supplying the parts wherein each part comprises, in the interface area thereof for contact with the other part, a weld bead intended to come into contact against the weld bead of the other part during the mirror welding, the weld bead of at least one of the parts is provided with a plurality of expander ribs (N) spread out along the weld bead, in such a way as to locally expand the width of the weld bead.