Virtual prediction and constraint of contour errors induced by cutting force disturbances on multi-axis CNC machine tools

Abstract Compared with traditional milling, ultrasonic-assisted cutting of honeycomb cores has the advantages of good surface quality and low cutting force. Because the ultrasonic cutter and chip shapes used in ultrasonic machining are significantly different from traditional machining methods. This study is based on UG CAM for process planning, which will be converted into codes that can be recognized by six-axis CNC machine tools through post-processing, and verify the feasibility through VERICUT simulation.

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Loading of the Manufacturing Systems Elements in the Process of Unsteady Mode Cutting and the Models of their Arrangement Deviations

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.682.192 ◽

2014 ◽

Vol 682 ◽

pp. 192-195 ◽

Cited By ~ 16

Author(s):

U.S. Putilova ◽

Yu.I. Nekrasov ◽

A.A. Lasukov

Keyword(s):

Cutting Force ◽

Machine Tools ◽

Manufacturing Systems ◽

Diagnostic System ◽

Cnc Machine Tools ◽

Cnc Machine ◽

Cutting Force Components ◽

On Line ◽

Servo Drives ◽

Force Components

To improve the treatment accuracy by on-line correction of the paths of the executive working parts (EWP) the authors study the processes of loading, deformation and arrangement deviation of the elements of the manufacturing systems (MS) under the changes of the cutting force components in the process of turning on machine-tools equipped with CNC systems of PCNC class. Estimation of the values of the technological components of the cutting force Px, Py, Pz is based on the phenomenon of arrangement deviation Δωi of the elements monitoring the servo drives of machine tools. To determine the compliance of the deviation magnitude Δwi with the technological components of the cutting force Px, Py a diagnostic subsystem was developed, involving the loading devices and dynamometric equipment. The diagnostic system is controlled through PCNC with the application of a specially developed hardware-software system. The data on changes in the values Px, Py and the respective changes in the attitude misalignment parameters in servo drives at various EWP minute feeds in CNC machine tools were determined by prior diagnosis of load characteristics servo drives, registered in the PCNC. So, the data of cutting force components Px, Py compliance with arrangement error ratios ΔωXп, ΔωZп. were established.

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Research on the Cutting Force Induced Error Measurement Method of the CNC Machine Tools

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.220-223.426 ◽

2012 ◽

Vol 220-223 ◽

pp. 426-430

Author(s):

Huan Lao Liu ◽

Bao Yue Chen ◽

Feng Liu ◽

Guang Yu Tan

Keyword(s):

Cutting Force ◽

Machine Tools ◽

Measurement Method ◽

One Dimension ◽

Cnc Machine Tools ◽

Error Measurement ◽

Cnc Machine ◽

Working Process ◽

Machine Error ◽

Hard Cutting

The cutting force induced error has been more important as the hard cutting and hard cutting material used. This paper proposed the direct measurement method of cutting force induced error, which realized the corresponding directly of the cutting force and the value of error in the working process. According to the discrimination of machine error characteristics reflected by the different measuring methods, it puts forward to building the mixed error model based on the measuring technology of one dimension and two dimension. The results could provides the test data and theoretical basis for the mechanism of the processing performance affected by the dynamic behavior of machine tools.

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A STEP Compliant Framework for Cutting Force Prediction for NC Turning Operations

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.889-890.1009 ◽

2014 ◽

Vol 889-890 ◽

pp. 1009-1013

Author(s):

Ri Liang Liu ◽

Hai Guang Zhu

Keyword(s):

Cutting Force ◽

Machine Tools ◽

New Technologies ◽

Mechanistic Modeling ◽

Numerical Control ◽

Cnc Machine Tools ◽

Prototype System ◽

Cnc Machine ◽

Turning Operations ◽

Part Program

With STEP-NC (ISO 14649) being gradually accepted as new standard for programming computerized numerical control (CNC) machine tools, new technologies and computer systems in the design and manufacturing process chain are emerging, and conventional systems are reshaping, to support interoperable and intelligent manufacturing. This paper addresses issues and solutions for the adaptation. In the first place, a strategy for adapting legacy CNC turning machine tools to the emerging standard is presented. In the second place, the new data model is analyzed and a practical way to retrieve and extract manufacturing information from the STEP-NC part program for turning process is presented. In the third place a workable approach to calculating the cutting force and chip load in turning operations is presented based on the mechanistic modeling method. Finally the proposed approach is implemented in a prototype system and tested with an example STEP-NC program for turning, which shows not only the feasibility of the proposed approach for information extraction and process evaluation, but also the possibility of using simple transitional systems to bridge the gap between the sophisticated STEP-NC part program and conventional CNC machines.

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