Repeated positioning precision detection method of white vehicle body main splicing clamp switching system

Abstract

The invention discloses a repeated positioning precision detection method of a white vehicle body main splicing clamp switching system. The method comprises following steps of a, selecting multiple to-be-tested points on a clamp substrate of the main splicing, and fixedly arranging multiple probes corresponding to the to-be-tested points; b, using a displacement sensor to measure a distance value between each to-be-tested point and the corresponding probe; c, repeating the step b and acquiring distance values between multiple groups of to-be-tested points and the corresponding probes; d, calculating the absolute position precision Xij of each to-be-tested point and the ideal position thereof; e, calculating repeated positioning precision R of the main splicing; and f, comparing the calculated repeated positioning precision R with the theoretical precision value, and judging whether the working state of the main splicing is normal or not. According to the invention, real-time detection can be conducted on the repeated positioning precision of the main splicing clamp switching system; obtained results are displayed on a computer in forms of graphs and data; and the system is capable of judging whether to give an alarm about stopping lines by judging whether the repeated positioning precision is in an error permissible range, thereby ensuring that the vehicle body meets a precision requirement.

Description

technical field [0001] The invention relates to the field of detection of main assembly precision, in particular to a detection method for repetitive positioning accuracy of a body-in-white main assembly fixture switching system. Background technique [0002] The main assembly technology of the existing body-in-white welding production line basically uses fixed-connected fixtures, and uses translation or rotation to realize flexible multi-model switching to adapt to automatic production of different models on the same production line. The flexible fixtures and switching mechanisms in this way are often The structure is complex and occupies a large area. Because the positioning accuracy is difficult to guarantee, the body-in-white is usually sampled and tested using a three-coordinate measuring machine for offline detection. This method consumes a lot of time and cannot realize real-time detection of the welding of the body-in-white. , if there is a problem with the body-in-w...

AI Technical Summary

Problems solved by technology

[0002] The main assembly technology of the existing body-in-white welding production line basically uses fixed-connected fixtures, and uses translation or rotation to realize flexible multi-model switching to adapt to automatic production of different models on the same production line. The flexible fixtures and switching mechanisms in this way are often The structure is complex and occupies a large area. Because the positioning accuracy is difficult to guarantee, the body-in-white is usually sampled and tested using a three-coordinate measuring machine for offline detection. This method consumes a lot of time and cannot realize real-time detection of the welding of the body-in-white. , if there is a problem with the body-in-white sampled and inspected, the staff must stop the line for inspection. At this time, the body-in-white with problems has already been transmitted to multiple stations behind, which will inevitably cause huge economic losses; and the main unit has been working under load for a long time In this state, it is impossible for the staff to stop the line for inspection. Therefore, it is necessary to detect the repeated positioning progress of the main assembly to ensure that the welding accuracy of the body meets the requirements.

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