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Three-dimensional geometry modeling method for free-camber internal cavity surface

A modeling method and three-dimensional geometry technology, applied in 3D image processing, image data processing, measurement/indicating equipment, etc., can solve the problems of high cost, large amount of calculation for reconstructed images, long data integration time, etc., and meet the requirements of low , low cost, reduced time and cost effects

Inactive Publication Date: 2003-06-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the CT tomography method still has the disadvantages of low spatial resolution, long integration time for data acquisition, large amount of calculation for reconstructing images, and high cost.

Method used

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Examples

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Embodiment Construction

[0022] The operation process of the method of the present invention includes: clamping the workpiece to be measured on the integrated measurement and processing equipment, judging whether the inner cavity of the workpiece sample is exposed, and if not, removing the material layer by layer until the inner cavity is exposed, and then by the displacement sensor. The measurement points track the boundary of the inner cavity and measure. If the overall inner cavity of the workpiece sample to be measured is measured, a three-dimensional geometric model of the inner cavity surface is established. If the measurement is not completed, a layer of material is cut off to measure the next layer of contour.

[0023] The workpiece to be measured in the embodiment of the present invention is the steam inlet of an automobile, and the integrated measurement and processing equipment adopted is composed of a three-axis numerical control milling machine with a laser digitizer installed on the main s...

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Abstract

The method for creating 3-D geometrical model of internal cavity with free curved face adopts measuring and machining integrated equipment, which includes the following steps: utilizing the method of removing measured workpiece material by layers to obtain the geometrical profile of plane section of every layer of internal cavity of the workpiece; using motion transducer to track and measure profile boundary of cross section of internal cavity to obtain precision sampling point information of internal cavity profile, utilizing all the profile sampling point informations of all the internal cavity sections to create 3-D geometrical model of the surface of the internal cavity, then utilizing said model to form curved face machining model.

Description

Technical field: [0001] The invention relates to a three-dimensional geometric shape modeling method of a free-form inner cavity surface, relates to three-dimensional measurement and three-dimensional modeling, is used for three-dimensional digitization of the inner cavity surface contour of an object, and belongs to the field of mechanical design and manufacturing. Background technique: [0002] The product shape design characterized by free-form surfaces is widely used in the fields of automobiles, airplanes, ships, household appliances and medical rehabilitation. The geometric information of the outer surface of this type of product can be obtained relatively easily through various existing inverse methods, but it is much more difficult to obtain the geometric shape of the inner cavity surface. This is mainly due to the fact that for complex free-form surfaces, the probe of ordinary measuring equipment can only reach a limited space range, and the probe cannot reach most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q17/20G06T15/08
Inventor 王宇晗李晔胡俊
Owner SHANGHAI JIAO TONG UNIV
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