Volumetric error compensation model for five-axis machine tools considering effects of rotation tool center point

Xiang, Sitong; Deng, Ming; Li, Huimin; Du, Zhengchun; Yang, Jing

doi:10.1007/s00170-019-03497-5

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…The concept of a measurement coordinate system fixed to the workpiece frame was utilised to develop an alternative and simplified geometric error model for rotary table-based machine tools, 25 based on the traditional forward/ inverse kinematics method. More recently, the corrections applied by dynamic approaches (both RTCP and RTDFO) during motion to maintain a constant relative distance between the tool and workpiece have been incorporated into error modelling strategies, integrating RTCP into a traditional geometric error compensation approach 26 and for detecting linkage performance through the evaluation of RTCP trajectories. 27 Tilted workplane.…”

Section: Numerical Control Programming Approachesmentioning

confidence: 99%

Comparing approaches for multi-axis kinematic positioning in machine tools

Rooker

Potts²,

Worden

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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Maintaining minimal levels of geometric error in the finished workpiece is of increasing importance in the modern production environment; there is considerable research on the identification, verification and calibration of machine tool kinematic error, and the development of Postprocessor implementations to generate NC-code optimised for machining accuracy. The choice of multi-axis positioning function at the controller, however, is an often-overlooked potential source of kinematic error which can be responsible for costly mistakes in the production environment. This paper presents an investigation into how mis-management of the positional error parameters that define the rotary-axes’ pivot point can lead to unintended variations in multi-axis positioning. Four approaches for kinematic positioning on a Fanuc-based controller are considered, which reference two separate parameter locations to define the pivot point – managing the kinematics within the Postprocessor itself, full five-axis positioning with a fixture offset, full five-axis with rotation tool centre point control and 3+2-axis with a tilted workplane. Error vectors across four sets of rotary-axis indexations are simulated based on the theoretical kinematic model, to highlight the expected differences in geometric error attributable to mismatched pivot point parameters. Finally, the simulation results are verified experimentally, demonstrating the importance of maintaining a consistent approach in both programming and operation environments.

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Section: Numerical Control Programming Approachesmentioning

confidence: 99%

Comparing approaches for multi-axis kinematic positioning in machine tools

Rooker

Potts²,

Worden

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…In the work of Vasundara and Padmanaban [9], an exhaustive critical literature review is conducted, and presents the different approaches to optimize a fixture layout. Moreover, extensive literature investigated the effects of the machine geometric errors on the machining accuracy and proposed multiple models to compensate them based on the machine axes' motions [10,11].…”

Section: Imentioning

confidence: 99%

A Small Displacement Torsor Model To Evaluate Machining Accuracy In The Presence Of Locating And Machine Geometric Errors

Souilah¹,

Tahan²,

Abacha³

2021

Progress in Canadian Mechanical Engineering. Volume 4

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Precision in Computer Numerical Control (CNC) machining is crucial to manufacturers in their quest to achieve better productivity. During the machining process planning, various factors must be considered, from workpiece design to manufacturing, and finally, to inspection, all of which influence the final quality of the workpiece. In this study, geometric and dimensional errors of fixture's locators, the workpiece datum features' errors in locating a workpiece on a fixture and machine tool geometric errors will be considered in evaluating the accuracy of drilling or milling of a workpiece feature based on the Small Displacement Torsor (SDT) theory. Specifically, the tolerances that are assigned to fixture locators, the workpiece datum feature geometric errors and the machine tool translational and rotational errors are combined in the same model in order to estimate the workpiece machined feature conformity by the mean of the Monte-Carlo tolerance analysis simulation method. This work aims to help fixture designers make better decisions with respect to fixture tolerancing upstream of manufacturing based on a certain predefined confidence level.

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“…Considering the influence of mounting errors of the T-side ball, the center offset of the T-side ball (x T , y T , z T ) with respect to the tool spindle axis is added to the initial center coordinate T T in the Equation (1), expressed as the following Equation (15). In the same way, the center offset of the W-side ball (x W , y W , z W ) with respect to the C axis origin is added to the initial center coordinate W C in the Equation 13, expressed as the following Equation (16). The simulation is performed in two coordinate systems at the condition that the offset is 20 µm and the obtained results are shown in Table 4.…”

Section: Influence Of Mounting Errors Of Ball Bar On Circular Trajectmentioning

confidence: 99%

“…Yang et al measured and verified the position-independent geometric errors of a five-axis machining center using the ball bar [15]. In addition, other researchers also used the ball bar to explore the measurement and identification methods for geometric errors of five-axis machining centers with a tilting rotary table [16][17][18] or in universal spindle head type five-axis machining centers [19]. On the other hand, R-test has been applied recently to investigate the geometric deviations identification method for the five-axis machining centers with a swiveling head [20,21].…”

Section: Introductionmentioning

confidence: 99%

Identification Method of Geometric Deviations for Multi-Tasking Machine Tools Considering the Squareness of Translational Axes

et al. 2020

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Some methods to identify geometric deviations of five-axis machining centers have been proposed until now. However, they are not suitable for multi-tasking machine tools because of the different configuration and the mutual motion of the axes. Therefore, in this paper, an identification method for multi-tasking machine tools with a swivel tool spindle head in a horizontal position is described. Firstly, geometric deviations are illustrated and the mathematical model considering the squareness of translational axes is established according to the simultaneous three-axis control movements. The influences of mounting errors of the measuring instrument on circular trajectories are investigated and the measurements for the B axis in the Cartesian coordinate system and the measurements for the C axis in a cylindrical coordinate system are proposed. Then, based on the simulation results, formulae are derived from the eccentricities of the circular trajectories. It is found that six measurements are required to identify geometric deviations, which should be performed separately in the B axis X-direction, in B axis Y-direction, in C axis axial direction, and three times in C axis radial direction. Finally, a numerical experiment is conducted and identified results successfully match the geometric deviations. Therefore, the proposed method is proved to identify geometric deviations effectively for multi-tasking machine tools.

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Volumetric error compensation model for five-axis machine tools considering effects of rotation tool center point

Cited by 14 publications

References 18 publications

Comparing approaches for multi-axis kinematic positioning in machine tools

Comparing approaches for multi-axis kinematic positioning in machine tools

A Small Displacement Torsor Model To Evaluate Machining Accuracy In The Presence Of Locating And Machine Geometric Errors

Identification Method of Geometric Deviations for Multi-Tasking Machine Tools Considering the Squareness of Translational Axes

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