An adaptive contour clamping device for welding of an automobile seat framework

By using a three-jaw clamping mechanism and magnetorheological fluid control, adaptive conformal clamping is achieved, solving the problems of clamping deformation and thermal stress in the welding of automotive seat frames, and improving welding accuracy and quality.

CN121776785BActive Publication Date: 2026-07-24WUHAN WEIYA AUTO PARTS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN WEIYA AUTO PARTS CO LTD
Filing Date
2026-03-04
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing automotive seat frame welding fixtures are difficult to adapt to complex curved surfaces, resulting in clamping deformation, vibration, or displacement, making it impossible to achieve precise control and effectively cope with welding thermal stress, thus affecting welding accuracy and quality.

Method used

The device employs a three-jaw clamping mechanism, which combines a drive mechanism, a contact claw clamping mechanism, a flexible contact bladder assembly, and a distributed pressure sensor. It achieves adaptive conformal clamping through the flow and solidification control of magnetorheological fluid, and utilizes a fine-tuning ball array and a logic controller for real-time attitude compensation and stress release.

Benefits of technology

It achieves seamless fitting and stable clamping of complex curved surfaces, suppresses welding deformation, improves welding accuracy and quality stability, and ensures that the workpiece does not deform under high temperature conditions.

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    Figure CN121776785B_ABST
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Abstract

The application discloses a self-adaptive contour clamping device for automobile seat framework welding, and relates to the technical field of welding fixtures.The clamping mechanism is arranged in a three-jaw structure, and the clamping mechanism of one jaw comprises a driving mechanism and a contact jaw clamping mechanism arranged at the side end of the driving mechanism.By arranging a fine-tuning ball array in the flexible contact capsule assembly, the workpiece is allowed to be passively displaced in the initial clamping stage to eliminate positioning deviation, and the coating is prevented from being scratched;in combination with a bottom distributed pressure sensor for monitoring the pressure of each point in real time, a built-in logic controller drives a side auxiliary adjusting mechanism to perform macro posture compensation, and a miniature control cylindrical air bag is used to implement micron-level pushing on the local contact capsule, so that the pressure of all contact points is uniform and the workpiece curved surface is completely attached, when the attachment reaches the standard, the solidified magnetorheological liquid forms a rigid contour pad to lock the workpiece, the heat stress is continuously adjusted and released in the process, the complex curved surface is effectively adapted, and the welding precision is improved.
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