Geometric Errors Compensation of CNC Machine Tool

Holub, Michal; Blecha, Petr; Bradac, Frantisek; Marek, Tomáš; Žák, Zdeněk

doi:10.17973/mmsj.2016_12_2016194

Cited by 10 publications

(5 citation statements)

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“…This publication is focused on describing the dependence between the volumetric accuracy of the machine and the resulting working accuracy, assessed on the error of workpiece roundness under finishing conditions of machining. The dependence between volumetric accuracy and roundness error is described in publication [29], according to ISO 230-4.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

et al. 2020

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Currently, various types of software compensations are applied to machine tools. Their aim is to increase the working accuracy of the tools. The improvement in working accuracy is then further assessed according to the increase in the dimensional and shape accuracy or the surface quality of the workpiece. This publication describes the effects of the volumetric accuracy of a machine tool on the working accuracy of a workpiece, where total roundness (RONt) is evaluated in multiple cuts. In the experiment, two test workpieces are manufactured on a three-axis milling machining centre. The first is made using a standard machine setup while the second with activated volumetric compensation. The LaserTRACER self-tracking laser interferometer is used to compensate for volumetric accuracy. In the second part, verification measurements are performed with a Ballbar, where roundness error is evaluated according to ISO 230-4. Then two test workpieces are machined, and, in the last part, measurement is performed on Talyrond 595S roundness measuring equipment. Finally, the results are analysed and the dependence between the volumetric accuracy, the circularity error of the machine and the working accuracy of the CNC machine tool is established, represented by the RONt of the workpiece. This paper presents new and unpublished relations between the volumetric accuracy of the machine tool and the RONt of the workpiece.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

et al. 2020

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“…The instrumentation must be set up for measuring of every error component. For instance, a 3-axis machine tool requires the acquisition of twenty-one error components: six error components for each axis and three squareness errors [Holub 2016]. Thus, the time required for the acquisition of geometric errors using conventional instrumentation is significant and most of the time is consumed within device setup phase.…”

Section: Introductionmentioning

confidence: 99%

New Device for Rapid Measurement of Machine Tool Geometric Errors

KUPRIN¹,

SVEDA²,

CHLADEK³

et al. 2022

MM SJ

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Control systems of modern machine tools are equipped with a number of functions for volumetric accuracy enhancement. These functions can compensate for all the geometric errors of the axes, which are characterized by 21 errors for a 3-axis machine tool. Compensation data are stored in compensation tables and the control system calculates actual compensation based on these tables and actual machine tool position. Geometric errors are measured within the machine tool maintenance plan and it presents a time-consuming process. Measurement is mainly based on interferometric devices, where the precise setup of laser source and detector is challenging. This article introduces an original system for automatic interferometer set up to speed up the measurement of geometric errors. The system is designed for the interferometer Renishaw XM-60, which simultaneously measures all 6 degrees of freedom. The developed control software identifies interferometer position and transforms the measured data into a machine coordinate system. Numerical simulation verified the proposed solution.

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“…Therefore, from the point of view of subsequent production, these are significant sources of error on machine tools. One of the advanced software compensations is a volumetric compensation through which it is possible to achieve an increase in volumetric accuracy by up to 85 % for a three-axis vertical machining centre [Holub 2016]. For these advanced compensations, it is necessary to take into account that they are time-consuming and due to this, also sensitive to ambient conditions.…”

Section: Introductionmentioning

confidence: 99%