On-line diagnosis method of vehicle body assembly quality based on part posture relationship discrimination

Abstract

The invention relates to an on-line diagnosis method of vehicle body assembly quality based on part posture relationship discrimination. The method comprises the following steps: 1) extracting measuring point and clamp positioning information and assembly process information in an assembly process by adopting a vehicle body assembly relationship and process information extraction module; 2) measuring an assembled white vehicle body at a terminal station by adopting a vehicle body deviation data pre-processing module; and 3) comparing the actually measured deviation data obtained by pre-processing in the step 2) with the part information design tolerance in a process assembly tree in the step 1) by adopting an on-line diagnosis module based on part posture relationship discrimination, so asto determine defective parts, realizing diagnosis of a fault station by utilizing a relative position discrimination method among parts, realizing diagnosis of self-defects of the parts in the station by virtue of discrimination on the relative distance between key measuring points on the defective parts in the fault station, and furthermore, determining a failure mode according to a posture deviation relationship model in the station, thereby realizing fault diagnosis of a clamp and guiding formulation of maintenance strategies of an assembly system.

Description

Technical field [0001] The invention relates to a quality detection technology, in particular to an on-line diagnosis method for the assembly quality of a car body based on the discrimination of the position and posture relationship of parts. Background technique [0002] In recent years, the reorganization of domestic automobile manufacturing enterprises has continuously intensified competition in the automobile market. The research on dimensional deviation control and diagnosis methods of car body manufacturing is becoming one of the hot issues in the industry and academia, and the diagnosis technology of body assembly deviation sources has always been The problems faced by automobile manufacturers in the process of improving dimensional accuracy. In the complex assembly process of the car body, multiple error sources such as part manufacturing deviation, fixture positioning deviation, welding error and operation defect will affect the assembly deviation of the body in white. D...

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Problems solved by technology

[0006] Aiming at the problem that multiple deviation sources are difficult to diagnose during automobile assembly, the present invention proposes an on-line diagnosis method for car body assembly quality based on the difference in the position and orientation of parts to solve the problem of multi-station and multiple deviation sources; combined with CAD positioning information and assembly process Information, by extracting the fluctuation measurement points in the measurement data of the end station, the determination of the defective parts is realized; and by using the method of discriminating the relative pose relationship between the parts, through the top-down discrimination of the stations involved in the defective parts, it is realized Determination of the fault station

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