Method for determining fixture adjustment, body-in-white welding method and automatic fixture system
An adjustment volume, body-in-white technology, applied in control/adjustment systems, general control systems, welding equipment, etc., to solve problems such as inability to make predictive adjustments, inability to effectively archive, and rework of body-in-white dimensions.
Active Publication Date: 2021-12-28
BMW BRILLIANCE AUTOMOTIVE
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Problems solved by technology
This adjustment is affected by subjective factors and lacks objective data support
and may require multiple adjustment tests to meet the required size requirements
On the other hand, such dimensional adjustment based on the produced body-in-white or its sub-assemblies is a post-feedback mechanism, which has no way to optimize the products that have been produced, and cannot make predictive adjustments. If the size of the body-in-white seriously fails to meet the standard, there will be a risk of repair or scrapping
[0004] In addition, in the prior art, the adjustment method of the fixture is manually adjusted by using gaskets, and the adjusted size is also obtained based on subjective experience
Moreover, it is necessary to stop the line operation during adjustment, which in turn causes a reduction in production efficiency.
In addition, the adjustment process may also have the risk of human error and cannot be effectively documented
Method used
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[0081] figure 1 A flow chart of a multi-station welding process is shown. With the help of this diagram, the accumulation of deviations in the body-in-white welding process can be described. exist figure 1 The 1st station to the Nth station of the welding process are shown in . At these N stations in total, the individual parts provided by the supplier enter the welding process from station 1. The initial manufacturing deviation is brought in from here and recorded as x 0 . The fixture adjustment amount of the first station is denoted as u 1 , other deviations not expressed in the model, such as production process disturbances, are recorded as w 1 , after the assembly process at the first station, the dimensional deviation of the sub-total layer formed by a single piece is recorded as x 1 . The sub-assembly then enters the next station for assembly. Such dimensional deviations are transmitted and accumulated in the same way in each station, and all the single pieces a...
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The invention relates to a method for determining fixture adjustments in the welding of a body-in-white, wherein the body-in-white is formed by welding a plurality of individual parts step by step in a plurality of stations, the method comprising: transferring according to dimensional deviations And the single-piece positioning principle establishes a dimensional deviation transfer model in the form of a state space equation in the body-in-white welding process, and the dimensional deviation transfer model describes the cumulative coupling between the single-piece dimensional deviation and the adjustment amount of the fixture between the multiple stations transfer process; express the dimensional deviation transfer model as an input-output mode, and obtain the expression of the final station measurement point deviation; construct a performance index function that includes the final station measurement point deviation and fixture adjustment based on model predictive control; by using The performance index function is minimized to solve the fixture adjustment amount. The invention also relates to a computer-readable storage medium, a device for determining the adjustment amount of the jig, a body-in-white welding method, an automatic jig system for the body-in-white welding, and a body-in-white welding production line.
Description
technical field [0001] The present invention relates to a method for determining the adjustment amount of jigs in the welding of body-in-white, a computer-readable storage medium, a device for determining the adjustment amount of jigs in the welding of body-in-white, and a welding method for welding body-in-white. An assembly method, an automatic fixture system for body-in-white welding and a body-in-white welding production line. Background technique [0002] The geometric dimension deviation of the welded body-in-white is one of the important evaluation criteria for the quality of the body-in-white. However, in the prior art, the analysis and control of the dimensional deviation in the production process is still mainly based on the engineer's experience. Specifically, it is first necessary to conduct offline three-coordinate measurement of the existing body-in-white or its sub-assemblies for random inspection; then analyze and judge the measurement report to determine wh...
Claims
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IPC IPC(8): G05B19/404B23K37/04
CPCB23K37/04B23K37/0443
Inventor 付昱凯陈昊杨光红朱波马红军
Owner BMW BRILLIANCE AUTOMOTIVE