scholarly journals Development of Motion Accuracy Measurement Method of Five Axis NC Machine Tools with ISO230-4

2006 ◽  
Vol 72 (7) ◽  
pp. 873-877
Author(s):  
Masaki USHIO ◽  
Norifumi KURMAE ◽  
Masahide KOUYA ◽  
Hiroyuki NARAHARA ◽  
Hiroyuki KORESAWA ◽  
...  
Keyword(s):  
Machine Tools ◽  
Measurement Method ◽  
Accuracy Measurement ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Five Axis

A novel approach to calculating the dynamic error reflected on an S-shaped test piece

2020 ◽  
pp. 095440622096215
Author(s):  
Weiwei He ◽  
Liping Wang ◽  
Liwen Guan
Keyword(s):  
Test Piece ◽  
Machine Tools ◽  
Dynamic Error ◽  
Dynamic Performance ◽  
Error Distribution ◽  
Feed System ◽  
Test Pieces ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Five Axis

This paper proposes a novel approach to calculating the dynamic error distribution reflected on an S-shaped test piece. First, a numerical model of an S-shaped test piece is established, and the distribution characteristics for the twist angle and curvature are analysed. Second, a delay continuous method (DCM), which can transform the discrete input into a delayed step input, is presented to express the single-axis dynamic error affected by the input quantitatively in the form of a mathematical expression. Based on the sinusoidal input, the feasibility of the DCM is verified by comparing the experimental results of a Simulink simulation model and a mathematical expression derived by the DCM. Third, according to a new three-point tangential (NTPT) positioning algorithm and the DCM, this article makes the first attempt to investigate the quantitative calculation method of the influence of the dynamic performance of a servo feed system for five-axis numerical control (NC) machine tools on the dynamic error distribution for S-shaped test pieces after processing. Parameter p, representing the dynamic characteristic of the servo feed system, is varied to compare the difference of the dynamic error distribution law on S-shaped test pieces. The calculation results show that the parameter p can be adjusted to reduce the dynamic error of the final machined test pieces. It is important to improve the dynamic performance of servo feed systems for five-axis NC machine tools and enhance the machining quality of test pieces. In addition, compared with the calculation results of the dynamic error distribution for an NAS979 test piece, the S-shaped test piece can reflect the dynamic performance of the servo feed system for five-axis NC machine tools more accurately and effectively. Finally, the effectiveness of the proposed calculation method is verified through processing experiments on a five-axis NC machine tool.

Optimizing of Integral Impeller NC Program Based on the Material Removal Rate

2014 ◽  
Vol 1030-1032 ◽  
pp. 1305-1308
Author(s):  
Shi Chao Li ◽  
Song Lin Wu ◽  
Yan Kun Liang
Keyword(s):  
Material Removal Rate ◽  
Machine Tools ◽  
Material Removal ◽  
Removal Rate ◽  
Cnc Machining ◽  
Machining Process ◽  
Machining Accuracy ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Five Axis

It is a general processing technology that multi-axis NC machine tools is used for machining impeller at present. In order to improve the machining accuracy of the five-axis NC machine tools, the paper analyzes the computing interpolation error of the Multi-axis CNC system in detail. Some of the measures of tools selection have been proposed in purpose of diminishing the accumulative error of the system. The paper also establishes the optimized objective function to optimize the process parameters of the CNC machining based on the material removal rate. All these measures will improve the machining efficiency significantly and increase the stationary of the machining process.

Reliability Analysis Based on Improved Bayes Method of AMSAA Model

2012 ◽  
Vol 482-484 ◽  
pp. 2336-2340
Author(s):  
Yang Qiang ◽  
Lei Zhang ◽  
Zhi Li Sun ◽  
Yi Liu ◽  
Xue Bin Bai
Keyword(s):  
Reliability Analysis ◽  
Machine Tools ◽  
Interval Estimation ◽  
Point Estimation ◽  
Life Data ◽  
Failure Data ◽  
Amsaa Model ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Five Axis

Aiming at the defects that failure samples of five-axis NC machine tools is small, traditional reliability analysis is not accurate, this paper presents reliability analysis mode based on improved Bayesian method for AMSAA model. Firstly, we obtain the failure model of NC machine tools meets the AMSAA model according to goodness-of-fit test, and in order to meet the requirements of simplifying engineering calculations, this paper adpots a method of Coefficient equivalent which converts failure Data into index-life data; then using Bayesian methods to estimate reliability parameters for the Index-life data; for the last we proceed point estimation and interval estimation for the MTBF of the machine. Take High-speed five-axis NC machine tools t of VMC650m for example, the result proved that the method can take advantage of a small sample of the equipment to proceed point estimation and interval estimation for MTBF failure data, and provide a reference for the optimization of maintenance strategies and Diagnostic work of the NC machine tools.

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.

Error Modeling and Identification Technology for Circular Path of NC Machine Tools

2013 ◽  
Vol 278-280 ◽  
pp. 345-349
Author(s):  
Zhen Ya He ◽  
Jian Zhong Fu ◽  
Xin Hua Yao
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Measurement Method ◽  
Geometric Error ◽  
Error Modeling ◽  
Circular Path ◽  
Rate Condition ◽  
Nc Machine ◽  
High Feed ◽  
Nc Machine Tools

An error mapping modeling and identification technology for the circular path test of NC machine tools is proposed. First, geometric error modeling of the NC machine tool was established and the theory of the laser measurement method was introduced. Then through further analyzing the influence of the geometric errors to circular path deviations, the error items were identified, such as the displacement errors, backlashes and squareness errors. Finally measurement and compensation experiment of circular path was conducted. The experimental results show that the geometric error modeling is feasible, and the measurement method can be set up easily and rapidly, even can be used to measure smaller radius circular path under a high feed rate condition. After compensation, the accuracy of the circular path of the machine tool is improved by 50.88%.

A New Composite Trajectory Method for Motion Accuracy Measurement of 3-Axis Machine Tools

2012 ◽  
Author(s):  
Zhengchun Du ◽  
Jianguo Yang ◽  
Steven Y. Liang
Keyword(s):  
Machine Tools ◽  
Polygonal Line ◽  
Measuring Method ◽  
New Method ◽  
Motion Error ◽  
Accuracy Measurement ◽  
Straight Line ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Geometric Motion

Geometric motion error measurement has been considered as an important task for accuracy enhancement and quality assurance of NC machine tools and CMMs. In consideration of the disadvantages of traditional measuring methods, such as Laser interferometer and Double Ball Bar method, a new measuring method for motion accuracy of 3-axis NC equipments based on composite trajectory including circle and non-circle (straight line and/or polygonal line) is proposed. The principles and techniques of the new measuring method are discussed in detail. 8 feasible measuring strategies based on different measuring groupings are summarized and optimized. The experiment of the most preferable strategy is carried out on the 3-axis CNC vertical machining center Cincinnati 750 Arrow by using cross grid encoder. The whole measuring time of 21 error components of the new method is cut down to 1–2 h because of easy installation, adjustment, operation and the characteristics of non-contact measurement. Result shows that the new method is suitable for ‘on machine’ measurement and has good prospects of wide application.

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