Vehicle Seat Back Frame Clamping Structure for Laser Welding
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Solution Overview
Problem
Existing vehicle seat back frames experience welding defects due to inadequate clamping during the welding process of side and lower frames.
Innovation Solution
The back frame design incorporates protruding flat surface portions that allow for clamping the lower and side frames during welding, using a welding mark as an intermediate point, thereby facilitating precise laser welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is performed to join side frames and lower frames, then structural integrity is improved, but welding defects occur due to inadequate clamping
Solution Approach 1:
The patent applies preliminary action by providing flat surface portions on the side frames and lower frames before welding. These flat surfaces are prepared in advance to enable proper clamping of the workpieces during the welding process, preventing movement and ensuring welding quality without requiring additional clamping devices.
Solution Approach 2:
The flat surface portions act as intermediaries between the welding apparatus and the workpieces. By providing these flat surfaces, the patent enables effective transmission of clamping force during welding, serving as a mediator that facilitates reliable joining without direct complex clamping mechanisms.
2Reliability
If complex clamping mechanisms are added to prevent welding defects, then welding quality is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by making the workpieces themselves (side frames and lower frames) provide the clamping surfaces through their own flat surface portions. This eliminates the need for external complex clamping mechanisms, as the workpieces serve their own clamping function during welding.
Solution Approach 2:
The patent extracts the clamping function from separate complex clamping mechanisms and integrates it directly into the workpiece structures through the flat surface portions. This separation of the clamping function from dedicated clamping devices simplifies the overall system while maintaining welding quality.
3Productivity
If welding is performed without proper alignment, then manufacturing efficiency is improved, but welding defects increase
Solution Approach 1:
The patent applies preliminary action by pre-providing flat surface portions on the workpieces before the welding process. These flat surfaces enable proper alignment and clamping to be established in advance, ensuring both manufacturing efficiency and alignment precision without requiring complex real-time adjustment mechanisms during welding.
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 design reduces welding defects by ensuring proper clamping and alignment of frames, enhancing the structural integrity and quality of the vehicle seat back frame.
Implementation Method 1
a welding mark is present on an intermediate portion in the seat width direction of the one flat surface portion... the welding operator can perform welding in a state where both one side and the other side are clamped with the welding mark interposed therebetween
Data Source
AI summary
To provide a back frame of a vehicle seat. A back frame of the present disclosure includes a first side frame and a second side frame, an upper frame and a lower frame, a first flange portion provided in the lower frame, a first flat surface portion provided in the lower frame, a second flange portion provided in the first side frame and having a second flat surface portion, and a third flat surface portion provided in the lower frame. At least one of the second flat surface portion and the third flat surface portion protrudes toward the other flat surface portion, and a welding mark is present on an intermediate portion in a seat width direction of the one flat surface portion.