Scientific and Technical Journal


ISSN Print 2221-3937
ISSN Online 2221-3805

The problem of assessing the state of the cutting tool in the processing of parts on machine tools with numerical control and flexible production modules was considered. It is shown that in assessing the condition of the cutting tool based on 3D models, it is necessary to solve the problem of determining the parameters of the spatial deformation of the current form cutting part from the initial form. Such a deviation may occur during operation of the cutting tool, for example as a result of tool wear, chipping or the presence of build-up on the cutting part.

The aim is to develop a method for comparing the shapes of objects based on 3D models and a study of its use in assessing the condition of the cutting tool.

The task evaluating "volume deformation" of the cutting tool is solved with the use of digital imaging technology in three-dimensional space in two stages: three-dimensional reconstruction of the object – creating 3D models, and the evaluation of object shape by received 3D models.

In the first stage, for forming 3D models of the cutting tool is proposed to use method, based on multispecies three-dimensional reconstruction of the object, which provides sufficient accuracy of the reconstruction.

In the second stage a method for comparing of the shapes of two objects by their 3D models (model of the current state of the cutting tool and the start model, with intact surface) was developed. This method, in contrast to existing methods, allows us to compare objects with minor deviations form, which is typical for the task of evaluating the state of the cutting tool.

The method is implemented in the machine vision system for evaluating the wear of the cutting part of the tool. Software implementation of the system consists of: subsystem of reconstruction multispecies, subsystem of comparisons polygonal 3D models, subsystem of visualization and the graphical user interface. In computer simulation on the models base of the cutting tool was found, that the use of this method for the assessment of the cutting part of the tool allows you to locate places on models that differ from the start form, and to calculate some of numeric parameters: the distance between the corresponding points on the models, area which differ by surface, the volume of wear. Recommendations on the use of this method in machine vision systems were done.


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