On-line Asynchronous Compensation Methods for static/quasi-static error implemented on CNC machine tools

This paper analyzes CNC machine tools machining error sources, put forward a kind of on-line monitoring technology of CNC machine tools machining accuracy based on online neural network. Through the establishment of CNC machine tools condition monitoring platform, collection sensor signal of the key components of CNC machine tools, using time domain and frequency domain method of the original signal processing, extract the characteristic related to machining accuracy change, input to the neural network, identification the changes of machining accuracy. The experimental results show that, the on-line monitoring technology based on neural network, can identify the changes of machining accuracy.

Download Full-text

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.

Download Full-text

Study on Cutter Radius Compensation Methods for 5-Axis CNC Machining

Materials Science Forum ◽

10.4028/www.scientific.net/msf.628-629.347 ◽

2009 ◽

Vol 628-629 ◽

pp. 347-352 ◽

Cited By ~ 2

Author(s):

Yuan Liu ◽

Yong Zhang Wang ◽

Hong Ya Fu ◽

Zhen Yu Han

Keyword(s):

Machine Tools ◽

Cnc Machining ◽

Numerical Control ◽

Cnc Machine Tools ◽

Cnc Machine ◽

Nc Program ◽

Compensation Methods ◽

Radius Compensation ◽

Five Axes ◽

Discrimination Methods

The numerical control (NC) program files need re-generating if there is any tool dimension change or tool wear for multi-axis machining. If the tool is replaced to adapt this change there will be increased cost. To solute this problem, 3D cutter radius compensation method for 5-axis computer numerical control (CNC) machining is deeply researched. Taking five axes linkage machine tools of X, Y, Z, B, C form with rotary tables B and C as an example, coordinate transformation matrix (CTM) and the cutter compensation vector for 3D cutter radius compensation are derived. The discrimination methods for path joint pattern (PJP) are given. A controller with 3D cutter radius compensation function for 5-axis linkage CNC machine tools is developed based on this method. The controller is allocated to a 5-axis milling machine tool and experiments are done. The proposed algorithm is demonstrated using a practical example.

Download Full-text