Research on Error Compensation Techniques for NC Machine Tools

2013 ◽  
Vol 321-324 ◽  
pp. 833-837
Author(s):  
Gao Feng Zhu ◽  
Yan Lei Zhang
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Error Modeling ◽  
Machining Accuracy ◽  
Characteristic Matrix ◽  
Detection Model ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Multi Body ◽  
Error Parameter

Cause of machining error for NC Machine Tools is described, and principle of NC machinings error compensation on the basis of the existing in-line detection model of NC machine tools is analyzed in this paper. Regularity of error Modeling based on multi-body system is found,accordingly, we will find the corresponding characteristic matrix and transformation matrix if location features and sport features of the adjacent body are confirmed. Then, formula of error model is found, and we can get numerical solution and compensate error according to the identified error parameter. As a result, the machining accuracy of machine tools can be greatly improved.

Study of the Geometrical Error Modeling of NC Lathe Based on Multi-Body System Theory

2010 ◽  
Vol 139-141 ◽  
pp. 1093-1096
Author(s):  
Xiu Shan Wang ◽  
Yan Li ◽  
Yong Chang Yu
Keyword(s):  
System Theory ◽  
Error Compensation ◽  
Machine Tools ◽  
Error Modeling ◽  
Body System ◽  
Geometrical Error ◽  
Modeling Process ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Multi Body

The geometrical error modeling of the numerically controlled (NC) lathe is the key technique to kinematics design, precision analysis and error compensation. The study gives out the modeling process of the generally geometrical error model based on the multi-body system theory for the multi-axis NC machine tools. By the multi-system theory, using the low series body arrays to describe the complex mechanical system, the article has finished the geometrical error modeling of the numerically controlled lathe, analyzed the influence on the model of error of perpendicularity between the linear axes. The modeling method is highly-efficient and can not be affected by the structure of the NC machine tools. The error compensation and command correction can be implemented by the geometric errors model.

Application of Autoregressive Distributed Lag (ADL) Model to Thermal Error Modeling on NC Machine Tools

2011 ◽  
Vol 103 ◽  
pp. 9-14 ◽  
Author(s):  
En Ming Miao ◽  
Xin Wang ◽  
Ye Tai Fei ◽  
Yan Yan
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Thermal Error ◽  
Error Modeling ◽  
Thermal Error Modeling ◽  
Distributed Lag ◽  
Autoregressive Distributed Lag ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Thermal Error Compensation

Thermal error modeling method is an important field of thermal error compensation on NC machine tools, it is also a key for improving the machining accuracy of machine tools. The accuracy of the model directly affects the quality of thermal error compensation. On the basis of multiple linear regression (MLR) model, this paper proposes an autoregressive distributed lag (ADL) model of thermal error and establishes an accurate ADL model by stepwise regression analysis. The ADL model of thermal error is established with measured data, it proved the ADL model is available and has a high accuracy on predicting thermal error by comparing with MLR models.

Analysis on Geometry Error Software Compensation Technology Model of Gantry Five-Axis NC Machine Tool

2012 ◽  
Vol 241-244 ◽  
pp. 1470-1474 ◽  
Author(s):  
Hua Gang Han ◽  
Xiao Lin Hu ◽  
Ying Chun Li ◽  
Feng Shou Shang Guan
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Body System ◽  
Nc Machine Tool ◽  
Result Show ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Multi Body ◽  
Geometry Error ◽  
Five Axis

Based on multi-body system, the error model of gantry five-axis NC machine tools was discussed. The calculate method of precision process equation and NC instruction has been derived out. Based the above research works，make a emulate by using of geometry error compensation soft-ware. The result show machining precision can be improved through the error compensation method which is concluded in this paper.

Research on Modeling Flow of Volumetric Error for Five-Axis NC Machine Tools

2009 ◽  
Vol 626-627 ◽  
pp. 423-428
Author(s):  
Wei Sun ◽  
Hui Ma ◽  
Chao Feng Li ◽  
Bang Chun Wen
Keyword(s):  
Error Modeling ◽  
Characteristic Matrix ◽  
Volumetric Error ◽  
Machining Center ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Key Steps ◽  
Multi Body ◽  
Five Axis ◽  
Modeling Flow

Based on the achievements of early works, a volumetric error modeling flow which is based on multi-body system theory is put forward. The flow includes 4 key steps mainly: describing structure, setting up coordinate system, creating characteristic matrix and generating volumetric error model are respectively. The operating method of every step is discussed in detail and the solving formula is given. At last, taking the VMC650 machining center of milling and boring which is developed by a machine tool factory as example, the validity of modeling flow is verified. This study can be used as a reference for opening automatic modeling system.

Real-Time Error Compensation Technique and Its Application on NC Machine Tools

2004 ◽  
Vol 471-472 ◽  
pp. 587-591
Author(s):  
Guo Liang Liu ◽  
H.T. Zhao ◽  
G. Turyagye ◽  
Y.Q. Ren ◽  
Jian Guo Yang ◽  
...  
Keyword(s):  
Real Time ◽  
Error Compensation ◽  
Machine Tools ◽  
Thermal Error ◽  
The Body ◽  
Machining Accuracy ◽  
Time Error ◽  
Error Components ◽  
Nc Machine ◽  
Nc Machine Tools

This paper presents the method and process of the real-time error compensation (RTEC) on NC machine tools, which includes: identification and measurement of error components, separating and modeling of geometric-thermal error components, geometric-thermal volumetric error synthesis model, compensation control system, performance evaluation of error compensation by the body diagonal displacement measurement, and the industry application of real-time error compensation. The technique has been successfully applied to many different NC machine tools in the plants for practical production, and the machining accuracy of the NC machine tools is improved by an order of magnitude with low cost.

Error Modeling and Iterative Algorithm for Compensation Instructions of Five-Axes NC Machine Tools Based on the Multi-Body System Theory

2013 ◽  
Vol 658 ◽  
pp. 287-291
Author(s):  
Li Gang Cai ◽  
Huai Qing Lu ◽  
Rui Luo ◽  
Qiang Cheng ◽  
Pei Hua Gu
Keyword(s):  
Error Compensation ◽  
Translational Motion ◽  
Rigid Body Dynamics ◽  
Machining Accuracy ◽  
Characteristic Matrix ◽  
Body System ◽  
Nc Machine ◽  
Multi Body ◽  
Five Axis ◽  
Five Axes

The machining accuracy of NC machine can be improved significantly through the error compensation. The kernels of (multi-body system)MBS theories are that the number arrays of low-order body are used to describe the topological structures which are taken to generalize and refine MBS, and the characteristic matrix are employed to represent the relative positions and gestures between any two bodies in MBS. Based on the theory of rigid body dynamics and homogeneous coordinate transformation techniques, the space error model of five-axis gantry NC machine can be established, the modified NC instructions can be obtained and it prepares well ready for the software error compensation and the practical application. Gyratory motion of five-axis NC machine will generate the coupling of translational motion, so it is different from the three-axis NC machine in the process of error compensation and we need to decoupling.

NC Machine Position Accuracy Testing and NC System Error Compensation Analysis

2011 ◽  
Vol 130-134 ◽  
pp. 2316-2320
Author(s):  
Ke Zhang ◽  
Zheng Xing Cui ◽  
Li Ya Gai ◽  
Peng Ge ◽  
Dong Gao Cai
Keyword(s):  
Error Compensation ◽  
Laser Interferometer ◽  
Machining Accuracy ◽  
Nc System ◽  
Accuracy Requirement ◽  
Position Accuracy ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Processing Accuracy ◽  
Modern Manufacturing

NC machine plays an irreplaceable role in the modern manufacturing because of its high machining processing accuracy, quality stable, flexibility. Through using the Renishaw ML10 laser interferometer detect the positioning accuracy and repositioning accuracy of X axis and Z axis of the HTC20 series of NC machine tools. According to the detection result compensate NC system to meet the machining accuracy requirement. The result shows that the error compensation of NC system is a effective method to improve the position accuracy of NC machine.

Research on Thermal Error Compensation Instrument Based on Thermal Modal Analysis for NC Machine Tools

2013 ◽  
Vol 819 ◽  
pp. 76-80 ◽  
Author(s):  
Bo Yang ◽  
Yi Wang ◽  
Wen Li Yu ◽  
Xin Hua Yao ◽  
Jian Zhong Fu
Keyword(s):  
Modal Analysis ◽  
Software Design ◽  
Error Compensation ◽  
Machine Tools ◽  
Thermal Error ◽  
Key Points ◽  
Compensation Theory ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Thermal Error Compensation

Great efforts have been made to improve the accuracy of NC machine tools, within which thermal error compensation is one of the most efficient ways. A new thermal error compensation instrument which is based on thermal modal analysis for NC machine tools is introduced in this paper. OMRONsCJ2M-CPU11 is used as microcontroller, and SAILING TECHNOLOGYs STA-A08 temperature measuring modules as temperature transmitter. Through hardware and software design, high precision and stability can be achieved. By measuring several key points temperature and making use of a thermal error compensation theory, real-time thermal error compensation can be output to the machine tool, thus thermal error can be reduced.

The Study of Closed-Loop Position Control System Based on CNC Processing

2014 ◽  
Vol 941-944 ◽  
pp. 2243-2246
Author(s):  
Xin Zhou
Keyword(s):  
Control System ◽  
Machine Tools ◽  
Closed Loop ◽  
Position Control ◽  
Machining Accuracy ◽  
Closed Loop Control ◽  
Loop Control ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Position Control System

In view of the existing problems of indirect position closed-loop control, a digitized closed-loop control method is presented and a new kind of position control system with fully digitized closed-loop based on that method is developed. In this way, the fully digitized control of cutter trajectory is implemented with the features of digitized driving, digitized measuring and digitized position control, so that the machining accuracy of the NC machine tools is effectively assured. This system has been used on varieties of NC machine tools and very good results have been obtained in the machining of complex precision parts.

Failure Mode Analysis for High-Speed Motorized Spindle of NC Machine Tools

2014 ◽  
Vol 623 ◽  
pp. 85-89
Author(s):  
Yu An He ◽  
Yan Ming He
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Failure Modes ◽  
Fault Tree ◽  
Mode Analysis ◽  
Machining Accuracy ◽  
High Speed Machining ◽  
Motorized Spindle ◽  
Nc Machine ◽  
Nc Machine Tools

High-speed motorized spindle of NC machine tools is the core component for high speed machining. Production efficiency, machining accuracy, processing quality are greatly improved, and production cost is reduced by high speed machining. The paper describes the common failure modes of high-speed motorized spindle. By the fault tree analysis method, failure modes of motorized spindle are modeled, and the main fault reasons of motorized spindle for NC machine tools are gotten. Qualitative analysis is performed for the fault tree by the mean of the structure function. At the end of this paper, the minimal cut sets which are the main sets of failure modes are all obtained. It has laid a good foundation for further study of quantitative analysis of motorized spindle failure modes.

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