Error Model for Grinding of Noncoaxial Aspheric Based on Kinematics for Multi-Body System

2012 ◽  
Vol 482-484 ◽  
pp. 1184-1187 ◽  
Author(s):  
Chen Jiang ◽  
De Bao Guo ◽  
Hao Lin Li
Keyword(s):  
Error Compensation ◽  
Machining Process ◽  
Body System ◽  
Factors Affecting ◽  
System A ◽  
Machining System ◽  
Ultra Precision ◽  
Multi Body ◽  
Errors Analysis ◽  
Parallel Grinding

The error compensation is an essential issue for improving the accuracy of the machining process. To solve the error compensation for parallel grinding of the noncoaxial aspheric lens, a kinematics model of six-axis ultra-precision machining system has been developed in the present study. Based on the theory of multi-body system, a kinematics errors analysis is presented. The interpolation errors of the parallel grinding method are discussed according to the kinematics errors analysis. Simulation results show that the rotation errors of the grinding system are crucial factors affecting the accuracy of the machining process.

Error Compensation of a NC Machining System Based on a Dynamic Feedback Neural Network

2011 ◽  
Vol 52-54 ◽  
pp. 1890-1894 ◽  
Author(s):  
Huang Lin Zeng ◽  
Yong Sun ◽  
Xiao Hong Ren ◽  
Li Xin Liu
Keyword(s):  
Neural Network ◽  
Error Compensation ◽  
Nc Machining ◽  
Machining Process ◽  
Dynamic Feedback ◽  
Machining System ◽  
Nc Machine ◽  
Feedback Neural Network ◽  
Set Up ◽  
Errors Analysis

Machining error of a NC machining system is a kind of comprehensive error in dynamically machining process; especially it is of errors with non-linear characteristics. In this paper, we will set up a kind of model of comprehensive errors analysis for a NC machining system and present an error compensation for high-precision a NC machining system by a dynamic feedback neural network embedded in a NC machine tool. The results obtained shows that this approach can effectively improve compensation precision and real time of error compensation on machine tools.

Based on the Nc Machining System Error Aspheric Analysis and Research

2011 ◽  
Vol 383-390 ◽  
pp. 7649-7653
Author(s):  
Hong Ying Wang ◽  
Xue Me Hu
Keyword(s):  
Error Compensation ◽  
Dynamic Error ◽  
Machining Process ◽  
System Error ◽  
Machining Precision ◽  
Processing Error ◽  
Machining Errors ◽  
Machining System ◽  
Forward Process

From the machining errors and static dynamic error influence two aspects are discussed in this paper, the analysis of machining process on the processing precision influence of error, puts forward process design. Long-term since, improving precision machine tool is through the two methods: error and avoid error compensation. Avoid error is a "hard", focusing on design and processing in the error may eliminate all stages. And error compensation in existing machine, can work environment to further improve the machining precision, it is a kind of economic effectively improve the machining precision of the method. For error analysis and calculation, the ultimate goal is to eliminate and reduce processing error, the improvement of the machining errors of classification in many ways. According to the machining process of the factors causing error to occur any regularity, processing error into system error and the random error, According to the nature of the changes with time, and can be divided into static error and dynamic error.

Dynamic Analysis of Abrasive Filaments in Contact with Different Workpiece Geometries

2018 ◽  
Vol 12 (6) ◽  
pp. 892-900
Author(s):  
Eckart Uhlmann ◽  
◽  
Christian Sommerfeld
Keyword(s):  
Equations Of Motion ◽  
Machining Process ◽  
Surface Finishing ◽  
Body System ◽  
Single Filament ◽  
Contact Behavior ◽  
Motion System ◽  
Contact Behaviour ◽  
Plastic Matrix ◽  
Multi Body

Abrasive brushes are often used for surface finishing and deburring and consist of a brush body with fixed, highly flexible abrasive filaments. During the brushing process the highly flexible abrasive filaments deform tangentially and axially and adapt to the shape of the workpiece. The contact behaviour of abrasive brushes in the machining process is very complex and has been insufficiently investigated so far. Abrasive brushes consist of a brush body with fixed, highly flexible abrasive filaments and are often used for surface finishing and deburring. During the brushing process, the highly flexible abrasive filaments deform tangential and axial and adapt to the shape of the workpiece. The mentioned contact behavior of the abrasive brush during the machining process is complex, and has not yet been sufficiently investigated. To better understand the contact behavior and, thus, the brushing process, a model of an abrasive filament is proposed in this study. The model describes the dynamic behavior of a single filament in contact with different workpiece geometries. The filament is discretized into a multi-body system of rigid links connected with rotational springs and rotational dampers, and the workpiece is approximated by using a polynomial. The contact of the multi-body system representing the filament with the surface of the workpiece is described by using Hertz’s theory of elastic contact and Coulomb’s law of friction. Based on this, a system of equations of motion for the multi-body system is obtained by using Lagrangian mechanics. A numerical solution of the equation of motion system was calculated by using experimentally determined material and contact properties of the filament as a composite of a plastic matrix and abrasive grains. A comparison of the calculated results with experimental data yielded satisfactory agreement for the contact between the filament and different workpiece geometries.

Geometric error compensation of spherical surface grinding system

2011 ◽  
Vol 225 (4) ◽  
pp. 473-482
Author(s):  
K-Z Xu ◽  
C-J Wei ◽  
D-J Hu
Keyword(s):  
Error Compensation ◽  
Spherical Surface ◽  
Geometric Error ◽  
Surface Grinding ◽  
System A ◽  
Control Computer ◽  
Rotational Joint ◽  
Translational Joint ◽  
Multi Body ◽  
Grinding System

Kinematics theory for a multi-body system is used to analyse translational joint error, rotational joint error, and quadrature error in a spherical grinding system. A virtual grinding point method is proposed that is based on process features, and the feasibility as well as effectiveness of this method is demonstrated. A volumetric error model of the grinding system is created and the compensation method is coded into a control computer program. A laser interferometer is used to experimentally measure the error both with and without the proposed error compensation scheme. The experimental results validate the proposed approach in that they show that the spherical surface grinding precision is significantly improved.

Research about Deformations Identification for Globoidal Cam Machine Based on Multi-Body System Theory

2014 ◽  
Vol 597 ◽  
pp. 454-457
Author(s):  
Li Ping Zhao ◽  
Hong Ren Chen ◽  
Yi Yong Yao ◽  
Hu Zhao ◽  
Peng Yan
Keyword(s):  
System Theory ◽  
Machine Tool ◽  
Structure Optimization ◽  
Machining Process ◽  
Body System ◽  
Key Factors ◽  
Machining Precision ◽  
Multi Body ◽  
Deformation Error ◽  
Stiffness Distribution

Deformation error caused by cutting heart and external force is one of the key factors influencing machining precision in machining process. Aiming to identify the machine deformation which has the most important influence on machining precision, an identification method for sensitive error and deformation based on multi-body system theory has been proposed, which lay the basis of stiffness distribution of a machine tool and structure optimization of parts. At the end of this paper, the effective of this method is verified by using the machine tool for globoidal cam.

Volumetric Error Modeling and Analysis for CNC Machine Tool Based on Multi-Body System

2010 ◽  
Vol 426-427 ◽  
pp. 441-446 ◽  
Author(s):  
Zhen Ya He ◽  
Jian Zhong Fu ◽  
Xin Hua Yao
Keyword(s):  
Error Compensation ◽  
Measurement Method ◽  
Precision Machining ◽  
Cnc Machine Tool ◽  
Body System ◽  
Software Platform ◽  
Cnc Machine ◽  
Vector Measurement ◽  
Measurement And Analysis ◽  
Multi Body

With the development of the CNC precision machining and the ultra-precision machining, machine tools error issue has became the most active research topics and concerned by more and more experts. In this paper, a rapid simulation software platform based on multi-body system theory and Matlab software for measurement and analysis geometric errors of CNC machine tool is presented, which includes the generation of simulated measurement data, data processing, error separation and error compensation etc. To verify the feasibility of the developed software, the sequential step diagonal vector measurement method has been analyzed. The experimental results show that after error compensation the machine performance is improved by 39%. It demonstrates that the sequential step diagonal vector measurement method could significantly improve the machine accuracy and the developed software platform is reliable. This platform is not only effective for step diagonal vector measurement method, but also can be applied to other measurements. Therefore, the software platform provides a fast, reliable and objective tool for machine error measurement and analysis.

Error Model of the Tangent Method CNC Aspheric Machine Tool Based on Multi-Body System Theory

2013 ◽  
Vol 401-403 ◽  
pp. 135-138
Author(s):  
Zheng Lin Yu ◽  
Hao Tian Yang ◽  
Bo Yu ◽  
Li Dong Gu
Keyword(s):  
System Theory ◽  
Machine Tool ◽  
Error Compensation ◽  
Mathematical Expression ◽  
Error Model ◽  
Body System ◽  
Tangent Method ◽  
Multi Body ◽  
Low Order

Based on the theory of multi-body system, for thetangent method CNC aspheric machine tool, the paper shows out the topologicalstructure and the array of low-order body of the system, the modeling processis stated, a specific mathematical expression for the comprehensive error modelis established, and it will be a steppingstone to the error compensation forthe machine tool.

Research on Software Error Compensation of Ultra-Precision Lathe

2006 ◽  
Vol 315-316 ◽  
pp. 602-606
Author(s):  
Jian Jun Du ◽  
Wing Bun Lee ◽  
Chi Fai Cheung ◽  
Suet To ◽  
Ying Xue Yao ◽  
...  
Keyword(s):  
Error Compensation ◽  
Constraint Equation ◽  
Precision Manufacturing ◽  
Nc Code ◽  
Precision Turning ◽  
Ultra Precision ◽  
Multi Body ◽  
Cutting Experiments ◽  
Motion Constraint ◽  
Structure Layout

Based on the theory of kinematics for multi-body system, the relative motion constraint equation is deduced according to the structure layout and the error distribution of the ultra-precision lathe Nanoform200. By solving the constraint equation, the corrective NC code is derived that can compensate the geometric errors. The error compensation software is developed aimed at the ultra precision manufacturing of optics parts. The cutting experiments show that the method and model in this paper can improve the accuracy about 50% for the ultra-precision turning of optical parts.

The Integration and Innovation Design of Single Chip Computer and NC Machine Tool Control

2014 ◽  
Vol 926-930 ◽  
pp. 478-481
Author(s):  
Jun Liang Liu ◽  
Zi Lun Li ◽  
Luo Cheng Li ◽  
Zi Jie Song
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Body System ◽  
Single Chip ◽  
Nc Machine Tool ◽  
Implementation Techniques ◽  
Single Chip Computer ◽  
Nc Machine ◽  
Compensation Device ◽  
Multi Body

Against to the problem of widely used of software error compensation, raises error compensation device to instead of PC to realize erro r compensation. And introduces multi-body system relating to error compensation, represents the feasibility and implementation techniques of software error compensation using SCM. This program will show great values in the field of CNC.

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.

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