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Automobile sheet metal member reference coordinate system establishing method

A technology of automobile sheet metal parts and establishment methods, applied in the field of measurement

Inactive Publication Date: 2017-08-18
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the selection and establishment of the reference features of the front-end parts of the automobile body, the present invention proposes a method for establishing the reference coordinate system of the automobile sheet metal parts

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  • Automobile sheet metal member reference coordinate system establishing method

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Embodiment Construction

[0011] Hereinafter, the method for establishing the reference coordinate system of the automobile sheet metal part of the present invention will be described in detail with reference to the accompanying drawings.

[0012] The part has been severely deformed during several processing, and the nominal value provided by the digital model is meaningless. Under the condition that there is no part digital model, use the existing sheet metal parts, measure the key hole position or surface point data of the part through three coordinates as the nominal value, and set any initial set of reference points to unify in the three-coordinate coordinate system , to measure the parts features of the body-in-white and the vehicle state respectively;

[0013] Taking the measured value of the body-in-white as the nominal value and the measured value of the whole vehicle as the actual measured value, the measured value and the nominal value are fitted through the measured data, and the reference c...

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Abstract

The invention relates to a measurement technology for establishing a reference coordinate system of a sheet metal part. The method includes the following steps: under the condition that there is no digital model of the part, the existing sheet metal part is used to measure the key hole position or the surface point data of the part by three coordinates as the nominal value, and by setting a set of reference points , respectively measure the part features of the body-in-white and the complete vehicle; use the measured data to fit the measured value and the nominal value of the three coordinates, verify, and analyze the deviation of the reference point on the complete vehicle relative to the body-in-white in all directions; At the same time, analyze other characteristic positions, and determine whether the reference system is reasonable or not by setting corresponding thresholds. If it is satisfied, keep the reference feature combination. If it is not satisfied, then analyze the 3D distance of each feature position, and select a set of features with a small 3D distance deformation as the reference coordinate system for measurement; by comparing the deviation of the reference feature combination Size, select a group of features to establish a datum coordinate system.

Description

technical field [0001] The invention relates to a measurement technology, in particular to a measurement technology for establishing a reference coordinate system of an automobile sheet metal part. Background technique [0002] The rapid development of precision manufacturing technology in recent years has made manufacturers put forward higher and higher requirements for all aspects of their production and manufacturing. The front end of a car is a typical sheet metal part, and its structure itself is relatively complicated, especially after the assembly is completed, it will be deformed. Therefore, it is difficult to establish a reference coordinate system during measurement. [0003] The present invention adopts the existing measurement technology, selects and compares the reference features, and calculates the deviation, so that a better combination of features can be obtained to establish the reference coordinate system. Contents of the invention [0004] Aiming at t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/04
CPCG01B21/042
Inventor 任丽佳李梦雅李明
Owner SHANGHAI UNIV
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