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

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 ...