A New High-Efficiency Error Compensation System for CNC Multi-Axis Machine Tools

Wang, Shih-Ming; Yu, Han-Jen; Liao, Hung-Wei

doi:10.1115/imece2004-60550

Cited by 15 publications

(15 citation statements)

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“…For a machine, due to these errors the actual position of the tool always deviates from the commanded position. The actual position reached by the tool will be equal to the sum of the commanded position and of the error that occurs at the commanded position [2]. For a commanded position P, the error at the commanded position is measured as E(P).…”

Section: The Characteristic Of Positional Errormentioning

confidence: 99%

Enhancement of accuracy of multi-axis machine tools through error measurement and compensation of errors using laser interferometry technique

Barman

Sen

2010

MAPAN

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The present era is witnessing advancement in digital electronics and microprocessor which enables manufacturing sector capable to produce complex components within small tolerance zone in the tune of nanometre and at one machining center. All motion control systems have some form of position feed back system fitted with the machine. Such systems are not generally accurate due to the errors in the positioning performance of the machine tool which will change over time to time due to wear, damage and environmental effects. The complex structure of multi-axis CNC machine tools produce an inaccuracy at the tool tip caused by kinematic parameter deviations resulting in manufacturing errors, assembly errors or quasi-static errors. Analysis of these errors using a laser measurement system provides the manufacturers a way to achieve better accuracy and hence higher quality output from these processes. In this communication, techniques to measure the linear positional errors of axes of CNC machine tools by a laser interferometer calibration system and accuracy enhancement using the data obtained from the calibration cycle by feeding into the machine's controller with the help of linear error compensation package are discussed.

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Section: The Characteristic Of Positional Errormentioning

confidence: 99%

Enhancement of accuracy of multi-axis machine tools through error measurement and compensation of errors using laser interferometry technique

Barman

Sen

2010

MAPAN

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“…Modelling effort has in the past not considered the nonrigid case in the same depth as some other machine tool errors [14]. The main reason for this is that it is perceived as being of relatively small significance when compared to geometric and thermal errors, particular on small or ultraprecision machine tools.…”

Section: Non-rigid Body Errorsmentioning

confidence: 99%

The role of measurement and modelling of machine tools in improving product quality

Longstaff

Fletcher

Parkinson

et al. 2013

Int. J. Metrol. Qual. Eng.

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Abstract. Manufacturing of high-quality components and assemblies is clearly recognised by industrialised nations as an important means of wealth generation. A "right first time" paradigm to producing finished components is the desirable goal to maximise economic benefits and reduce environmental impact. Such an ambition is only achievable through an accurate model of the machinery used to shape the finished article. In the first analysis, computer aided design (CAD) and computer aided manufacturing (CAM) can be used to produce an instruction list of three-dimensional coordinates and intervening tool paths to translate the intent of a design engineer into an unambiguous set of commands for a manufacturing machine. However, in order for the resultant manufacturing program to produce the desired output within the specified tolerance, the model of the machine has to be sufficiently accurate. In this paper, the spatial and temporal sources of error and various contemporary means of modelling are discussed. Limitations and assumptions in the models are highlighted and an estimate of their impact is made. Measurement of machine tools plays a vital role in establishing the accuracy of a particular machine and calibrating its unique model, but is an often misunderstood and misapplied discipline. Typically, the individual errors of the machine will be quantified at a given moment in time, but without sufficient consideration either for the uncertainty of individual measurements or a full appreciation of the complex interaction between each independently measured error. This paper draws on the concept of a "conformance zone", as specified in the ISO 230:1 -2012, to emphasise the need for a fuller understanding of the complex uncertainty of measurement model for a machine tool. Work towards closing the gap in this understanding is described and limitations are noted.

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“…[2][3][4]. The usual approach to correct such errors consists in measuring, for each axis of the CNC machine, the six elementary error components that can be associated to the movements of any rigid body (three linear errors along three reference axes and three rotations around the same three reference axes) and then correcting the hardware of the machine accordingly.…”

Section: Introductionmentioning

confidence: 99%

A new conceptual approach for systematic error correction in CNC machine tools minimizing worst case prediction error

Chung

Bohez

Belforte

et al. 2011

Int J Adv Manuf Technol

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A new artifact-based method to identify the systematic errors in multi-axis CNC machine tools minimizing the worst case prediction error is presented. The closed loop volumetric error is identified by simultaneously moving the axes of the machine tool. The physical artifact is manufactured on the machine tool and later measured on a coordinate measuring machine. The artifact consists of a set of holes in the machine tool workspace at locations that minimize the worst case prediction error for a given bounded measurement error. The number of holes to be drilled depends on the degree of the polynomials used to model the systematic error and the number of axes of the machine tool. The prediction error is also function of the number and location of the holes. The feasibility of the method is first investigated for a two-axis machine to find the best experimental setting. Finally based on the two-axis case study, we extend the results to machine tools with any number of axes. The obtained results are very promising and require only a short time to produce the artifact

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A New High-Efficiency Error Compensation System for CNC Multi-Axis Machine Tools

Cited by 15 publications

References 0 publications

Enhancement of accuracy of multi-axis machine tools through error measurement and compensation of errors using laser interferometry technique

Enhancement of accuracy of multi-axis machine tools through error measurement and compensation of errors using laser interferometry technique

The role of measurement and modelling of machine tools in improving product quality

A new conceptual approach for systematic error correction in CNC machine tools minimizing worst case prediction error

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