A Study on estimation of three-dimensional tolerances based on simulation of virtual machining in turning processes including kinematic motion deviations

Abstract

The geometric dimensioning and tolerancing is one of the most important characteristics of machined parts. A systematic method is proposed in the paper to simulate the shape generation processes in turning operations, to estimate the geometric dimensioning and tolerancing of the turned faces, based on the machining parameters. The simulation model includes both the models of the shape generation motions considering kinematic motion deviations and the cutting tool geometries. The shape generation motions with deviations are mathematically described by combining 4 by 4 transformation matrices. A set of points on the turned faces are generated through the simulations, and an assessment surface is obtained as the datum reference to estimate the 3-dimensional (3D) tolerances, based on the points generated by the turning process simulations. The proposed method provides us with a systematic method to estimate the geometric dimensioning and tolerancing in the turning processes including the kinematic motion deviations.

A comparison between simulation and experiment of virtual machining in CNC turning machine considering kinematic motion deviations, tool wear and workpiece deflection errors

“…The coordinate systems are set according to ISO 230-1:2012(ISO 230-1, 2012. The turning processes are carried out by the spindle rotations, the linear feed motion along Z-axis and the depth of cut along X-axis (Thasana, et al, 2015).Therefore, eight Cartesian coordinate systems of the turning processes to simulate the virtual machining as shown in Fig. 2 are set to represent the kinematic motion deviations, tool wear and workpiece deflection.…”

“…In this research, the reference datum to measure the 3D tolerances of the turning surface on assessment cylinders were adapted from Thasana et al (2015). The assessment cylinders were generated based on all the 3-dimensional coordinate data generated by the 3-dimensional turning process simulations.…”

“…Recently, Thasana et al (2015) have proposed an estimation of three-dimensional tolerances based on simulation of virtual machining in turning processes including kinematic motion deviations. The proposed method has shown the simulation only, which did notdeal with how the comparison between simulation models and actual experiment of the final geometries of the machined parts and the kinematic motion deviations for estimating the cylindricity tolerances in the virtual turning processes.…”

“…The objective of the present research is to propose a comparison between the simulation model of virtual turning processes and the empirical results of actual turning processes on a CNC turning center. The simulation model was proposed and applied to the estimation of three-dimensional tolerances based on simulation of virtual machining in turning processes including kinematic motion deviations (Thasana, et al, 2015). In the present paper, the simulation model is expanded to simulate the turning processes with kinematic motion deviations, tool wear and workpiece deflection.…”

Application of the synergistic concept in determining the CNC program for turning

“…24 при трении [8][9][10]. Одновременно в последнее десятилетие научной общественностью уделяется большое внимание разработке виртуальной модели процессов обработки на металлорежущих станках [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Эти модели предназначены прежде всего для использования их на стадии технологической подготовки производства деталей сложного геометрического профиля.…”