Interlocking Bodywork Positioning for Vehicle Assembly Accuracy
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Solution Overview
Problem
In mass production of vehicle bodies, the dimensional accuracy of the assembled vehicle body depends heavily on the precise positioning of body parts relative to the system, which can be inconsistent due to variations in clamping and positioning methods.
Innovation Solution
The method involves using interlocking positive-locking elements on the body parts to secure them against slipping and twisting, allowing for precise relative positioning independent of the system's accuracy, with at least two form-fitting elements securing against slipping in two dimensions and additional elements securing against twisting in one dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical clamping devices are used to position body parts on the system, then the body parts can be secured in place, but the dimensional accuracy depends on the precision of the positioning system which can be inconsistent
Solution Approach 1:
The positioning function is segmented into two independent parts: (1) the form-fitting elements on the body parts themselves that provide mutual positioning, and (2) the clamping devices on the system that only need to hold the parts in approximately the correct position. This segmentation allows the critical positioning function to be performed by the body parts directly, making it independent of the system's positioning precision.
Solution Approach 2:
The body parts are equipped with form-fitting elements (protrusions and recesses) that enable them to position themselves relative to each other without relying on the positioning system. The body parts perform their own positioning function through the interlocking of complementary geometric features, making the system's positioning precision irrelevant to the final dimensional accuracy.
2Manufacturing precision
If complex clamping and recording technology is used to position body parts, then positioning precision can be improved, but the device complexity increases
Solution Approach 1:
The critical positioning function is extracted from the complex positioning system and transferred to simple form-fitting elements directly on the body parts. The system's clamping devices are reduced to simple holding functions, while the positioning precision is achieved through the geometric interlocking of complementary protrusions and recesses on the body parts themselves.
Solution Approach 2:
Instead of investing in expensive, complex positioning systems with high precision, the invention uses simple, inexpensive form-fitting elements (protrusions and recesses) that provide the necessary positioning accuracy. These simple geometric features are far cheaper and simpler to manufacture than complex clamping and recording technology.
3Manufacturing precision
If body parts are positioned precisely relative to the system, then joining accuracy can be achieved, but the process time increases due to complex positioning procedures
Solution Approach 1:
The form-fitting elements (protrusions and recesses) are pre-formed as integral parts of the body parts during their respective manufacturing processes. This preliminary creation of positioning features eliminates the need for time-consuming positioning operations during assembly, as the parts simply need to be brought into approximate alignment for the form-fitting elements to engage and establish precise relative positioning automatically.
Data Source
Figure 1~2
Figure 3
AI summary
The method involves providing a body part (1) with a form-fit element designed as a male part e.g. perforated pin-like bump (3). Another body part (2) is provided with a form-fit element e.g. punched hole (4), which cooperates with the form-fit element of the former body part. Both of the body parts are placed together, so that the form-fit elements are engaged with one another and the body parts are secured against slipping in specific directions and held in a predetermined set position. The body parts are permanently connected.