Segmented Vehicle Bodywork Positioning Jig Design
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Solution Overview
Problem
Existing jigs for installing motor vehicle bodywork elements, such as front fenders, are heavy and have significant inertia and reliability issues in positioning, which affects the efficiency and accuracy of the installation process.
Innovation Solution
A lightweight jig design featuring a carrier frame and a movable frame with elastic connections and a screw jack mechanism for precise positioning along orthogonal directions, reducing inertia and improving reliability while maintaining cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional jig design with two movable side frames and a centering frame is used, then the positioning of bodywork elements can be achieved, but the jig has significant weight and generates significant inertia in movement
Solution Approach 1:
The jig is divided into two functional parts: a stationary carrier frame that remains fixed during operation, and a movable frame that only moves horizontally to position bodywork elements. This segmentation eliminates the need for the entire structure to be movable, significantly reducing the weight of the moving portion while maintaining positioning accuracy through the stationary carrier frame's support.
2Measurement precision
If a traditional jig design with two movable side frames and a centering frame is used, then the positioning of bodywork elements can be achieved, but the jig lacks reliability in positioning
Solution Approach 1:
By separating the jig into a stationary carrier frame and a movable frame, the system achieves more reliable positioning. The stationary carrier frame provides a stable reference that does not move or deform during operation, while the movable frame's limited horizontal movement is precisely controlled. This segmentation eliminates the cumulative errors and instability that would occur if the entire structure were movable.
Solution Approach 2:
The system transitions from a fully movable traditional design to a dynamic configuration where only the necessary component (movable frame) moves horizontally, while the carrier frame remains stationary. This dynamic approach improves reliability by maintaining a stable reference frame throughout the positioning process.
3Adaptability or versatility
If elastic connections are used to connect the movable frame to the carrier frame, then the movable frame can deflect in the second and third directions, but the displacement from central position increases
Solution Approach 1:
The elastic connections are designed with specific mechanical properties that allow controlled deflection in the second and third directions while maintaining minimal displacement from the central position. By carefully selecting the elastic modulus, dimensions, and pre-stress of these connections, the system achieves the optimal balance between adaptability for accommodating bodywork elements and precision for accurate positioning.
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 jig achieves reliable and efficient positioning of bodywork elements with reduced weight and inertia, enhancing the installation process's accuracy and reducing the overall cost of the jig.
Implementation Method 1
the elastic member providing the movable frame with a deflection in the second and third directions with respect to a central position of least stress
Implementation Method 2
a cylinder for moving the movable frame relative to the carrier frame in said second direction, preferably a screw jack
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
This jig (2) comprises means (28) for gripping and holding the bodywork elements (4, 6) that are to be positioned, the jig (2) being able to position the gripping and holding means (28) relative to the body shell (8) in a vertical first direction (Z) and in horizontal second (X) and third (Y) directions, all the directions being mutually orthogonal. The jig (2) comprises: - a supporting frame (14) intended to press vertically on the body shell (8) of the vehicle (10) and to support the entire jig (2); - a mobile frame (16) for positioning the bodywork elements (4, 6) on the body shell (8) of the vehicle (10), the mobile frame (16) being mounted such that it can move on the supporting frame (14) and comprising gripping and holding means (28), the mobile frame (16) being intended to position the bodywork elements (4, 6) in the second and third directions (X, Y), the supporting frame (14) being intended to position the mobile frame (16) in the said first direction (Z).