Current State of the Art of Multi-Axis Control Machine Tools and CAM System

2014 ◽  
Vol 26 (5) ◽  
pp. 529-539 ◽  
Author(s):  
Yoshimi Takeuchi ◽  
Keyword(s):  
Machine Tools ◽  
Numerical Control ◽  
Current State ◽  
Machine Shops ◽  
Nc Machine ◽  
Unique Shape ◽  
Nc Machine Tools ◽  
Nc Data ◽  
Cam Systems

<div class=""abs_img""><img src=""[disp_template_path]/JRM/abst-image/00260005/01.jpg"" width=""300"" />Asymmetric curved grooving</div> Multi-axis numerical control (NC) machine tools such as 5-axis control machining centers and 5-axis control multi-tasking machines are widely used in machine shops. NC data, which are prepared using computeraided manufacturing (CAM) systems, are used with multi-axis control NC machine tools that have a variety of advantages. This article describes the advantages ofmulti-axis control machining. The structure of CAM systems used for multi-axis control machining and the important role of collision avoidance in generating cutter location (CL) data are then explained. The transformation of CL data to NC data for use in machining, which is performed by a post-processor, is presented. Finally, an efficient machining method and unique shape creation via 6-axis control machining are explained. </span>

A Reliability Analysis of NC Machine Tools Based on the Weibull Distribution

2015 ◽  
Vol 741 ◽  
pp. 763-767
Author(s):  
Hui Liang Li
Keyword(s):  
Weibull Distribution ◽  
Machine Tool ◽  
Machine Tools ◽  
Interval Estimation ◽  
Point Estimation ◽  
Numerical Control ◽  
Control Machine Tool ◽  
Failure Data ◽  
Nc Machine ◽  
Nc Machine Tools

In this paper, a series of numerical control machine tool truncated failure data collect.The data are assumed to be two parameter weibull distribution and related parameters is obtained and relevant inspection and test of hypothesis, it is concluded that the mathematical model of batch of nc machine tool failure interval time distribution.Relevant indicators to determine the reliability of nc machine tools, machine tool's observations, Machine tool observations, point estimation and interval estimation index value provide a theoretical basis for the research on reliability of machine tool.

Technology for Eliminating early Failure of NC Machine Tools

2012 ◽  
Vol 220-223 ◽  
pp. 395-401 ◽  
Author(s):  
Gen Bao Zhang ◽  
Jian Liu ◽  
Xiu Jun Fan
Keyword(s):  
Machine Tools ◽  
Numerical Control ◽  
Rotary Table ◽  
Early Failure ◽  
Early Failures ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Technical Framework

To eliminate the early failures and improve the reliability of numerical control (NC) machine tools, the comprehensive technology for these works is proposed in this paper. Firstly, model is established to describe the early failures of NC machine tools, then the formation of early failures and mechanism of early failures elimination are studied. Secondly, a comprehensive technical framework for eliminating early failures is introduced, with some detailed process and implementation. Finally, example of NC rotary table is shown to illustrate the applicability and validity of the technology for eliminating early failures of NC machine tools.

Research on the 840D NC Machine Tool Production Process Monitoring and Management

2014 ◽  
Vol 577 ◽  
pp. 421-424
Author(s):  
Le Ping Chu ◽  
De Ming Xiao ◽  
Zai Yu Chen ◽  
Cheng Rong Pian ◽  
Nan Wu ◽  
...  
Keyword(s):  
Machine Tool ◽  
Production Process ◽  
Machine Tools ◽  
Numerical Control ◽  
Nc System ◽  
Nc Machine Tool ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Plc Program ◽  
Status Data

According to the communication principle of 840D numerical control (NC) system and internal data structure, the PLC program is developed to make 840D system state data transmit to the PC with the MPI channels; production status data real-time monitoring system based on 840D NC machine tools is developed, meanwhile, the monitoring and data management for NC machine tool production process status is realized.

Correct Use and Maintenance of Nc Machine Tools

2014 ◽  
Vol 651-653 ◽  
pp. 676-679
Author(s):  
Quan Fang Sun ◽  
Jun Ling Zhang
Keyword(s):  
Control System ◽  
Machine Tool ◽  
Machine Tools ◽  
Numerical Control ◽  
Numerical Control System ◽  
Nc Machine Tool ◽  
Important Index ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Reasonable Use

A country's level of Nc machine tool and ownership, is to measure the level of manufacturing and industrial modernization level of important indicators, is also an important index to measure national comprehensive competitiveness. Therefore, how to better use and maintenance of Nc machine tool is an important issue. This paper introduced how to reasonable use of Nc machine tools, as well as the use of the numerical control system and inspection.

Modelling and real-time compensation of cutting-force-induced error on a numerical control twin-spindle lathe

2009 ◽  
Vol 224 (4) ◽  
pp. 567-577 ◽  
Author(s):  
H Wu ◽  
H J Chen ◽  
P Meng ◽  
J G Yang
Keyword(s):  
Neural Network ◽  
Cutting Force ◽  
Real Time ◽  
Bp Neural Network ◽  
Machine Tools ◽  
Error Model ◽  
Numerical Control ◽  
Machining Process ◽  
Nc Machine ◽  
Nc Machine Tools

Cutting-force-induced errors are one of the major sources of error in numerical control (NC) machine tools. The error compensation technique is an effective way to improve the manufacturing accuracy of NC machine tools. Effective compensation relies on an accurate error model that can predict the errors exactly during the machining process. In the present paper a robust and accurate cutting-force-induced error model is built using a back-propagation (BP) neural network and a genetic algorithm (GA) for an NC twin-spindle lathe. The GA—BP neural network modelling technique not only enhances the prediction accuracy of the model but also reduces the training time of the BP neural network. A real-time compensation system of the cutting-force-induced error on the lathe is developed based on the cutting-force-induced error model. The errors were reduced by about 38 per cent after real-time compensation in a machining experiment.

Optimization of 3D Pocket Machining Using Multiple Tools

2012 ◽  
Vol 503-504 ◽  
pp. 7-10
Author(s):  
Ming Rang Yu ◽  
Ying Jie Zhang ◽  
Ding Zhang
Keyword(s):  
Machine Tools ◽  
Cutting Tools ◽  
Numerical Control ◽  
Layer By Layer ◽  
Machining Time ◽  
Pocket Machining ◽  
Numerical Control Machining ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Scan Line

In numerical control machining, the number and the size of the cutting tools in use have a significant effect on machining efficiency. This paper puts forward a method to select the most appropriate group of cutters for 3D pocket machining using NC machine tools, which aim to minimize the total machining time. Considering the material is removed layer by layer in roughing, three scan-line filling algorithm is proposed to calculate the cutting area of every layer, which is necessary to calculate the machining time. After the total machining time of each group of cutters is calculated, the optimal group of cutters can be determined easily. Both the theoretical analysis and the simulated results show that the proposed algorithm can improve the efficiency of NC machining.

N-C Machining Technology Development Present Situation and the Trend

2013 ◽  
Vol 416-417 ◽  
pp. 796-799
Author(s):  
Hong Cai Yang ◽  
Ming Qing Wu
Keyword(s):  
High Precision ◽  
Machine Tools ◽  
High Speed ◽  
Complex Shape ◽  
High Efficiency ◽  
Technology Development ◽  
Rapid Development ◽  
Numerical Control ◽  
Nc Machine ◽  
Nc Machine Tools

the development of numerical control technology changes with each new day, the article expounds the nc machine tools with complex shape parts of high precision requirements for rapid development, widely used in conventional parts processing, complex shape parts processing. Nc machine tools with the aid of microelectronics and computer technology rapid progress, is toward high precision, multi-function, high speed, high efficiency, composite processing functions, such as intelligent direction, our country numerical control system in the technology has already become more and more mature, in the major key technologies, has reached the foreign advanced level.

UKFNN-based cutting energy consumption model of numerical control machine tools

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840109
Author(s):  
Jie Yuan ◽  
Zhicheng Ji ◽  
Yan Wang
Keyword(s):  
Neural Network ◽  
Kalman Filter ◽  
Energy Consumption ◽  
Machine Tools ◽  
Unscented Kalman Filter ◽  
Numerical Control ◽  
Cutting Process ◽  
Cutting Energy ◽  
Nc Machine ◽  
Nc Machine Tools

The energy consumption of numerical control (NC) machine tools is mainly from the cutting process. Since the cutting process has multiple characteristics, such as nonlinear, multi-variable and time-varying characteristics, it is difficult to establish an accurate model of the cutting energy consumption by both the static modeling and the traditional mechanism modeling. In this paper, the unscented Kalman filter neural network (UKFNN) is proposed to model the cutting energy consumption of NC machine tools. In the resulting model, the unscented Kalman filter (UKF) is adopted to update weights and thresholds of the neural network in real time, improving the generalization ability and the accuracy of the model. Experimental results show that the proposed method is effective and reliable to model the cutting energy consumption of NC machine tools.

Motion Accuracy Enhancement of Five-Axis Machine Tools by Modified CL-Data

2018 ◽  
Vol 12 (5) ◽  
pp. 699-706 ◽  
Author(s):  
Ryuta Sato ◽  
Shogo Hasegawa ◽  
Keiichi Shirase ◽  
Masanobu Hasegawa ◽  
Akira Saito ◽  
...  
Keyword(s):  
Machine Tools ◽  
Numerical Control ◽  
Geometrical Shape ◽  
Motion Trajectories ◽  
Shape Errors ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Simulation And Experiment ◽  
Profile Machining ◽  
Five Axis

The motion trajectories of machine tools directly influence the geometrical shape of machined workpieces. Hence, improvement in their motion accuracy is required. It is known that machined shape errors occurring in numerical control (NC) machine tools can be compensated for by modifying the CL-data, based on the amount of error calculated by the measurement results of the machined shape of the workpiece. However, by using this method the shape errors cannot be compensated accurately in five-axis machining, because the final machining shape may not reflect the motion trajectory of a tool owing to the motion errors of the translational and rotary axes. In this study, a modification method of the cutter location (CL)-data, based on the amount of motion errors of the tool center-point trajectory during the machining motion, is newly proposed. The simulation and experiment of a wing profile machining motion is performed, to confirm the effectiveness of the proposed method. From the results, we confirm that the motion accuracy can be significantly improved by applying the proposed method.

Approach to Machining Setup Process Planning of NC Machine Tools Based on Graph Theory

2012 ◽  
Vol 542-543 ◽  
pp. 1190-1195 ◽  
Author(s):  
Guo Zheng Zhang ◽  
Jiang Han ◽  
You Yu Liu
Keyword(s):  
Graph Theory ◽  
Process Planning ◽  
Machine Tools ◽  
Nc Machining ◽  
Numerical Control ◽  
Machining Process ◽  
Fixture Design ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Machining Process Planning

Setup datum of fixture design is an important factor of Numerical Control (NC) machining process planning. Using graph theory of FTG (Feature Tolerance relationship Graph) and DMG (Datum and Machining feature relationship Graph) technology, the feature relationship was proposed to construct a relational table of DMMT (Datum and Machining and Machine Tools) in NC machining setup process. The degree of graph as a discriminant evidence of the machining setup datum was given, so that the machining setup process planning was correctly designed. Combined with the capability of NC machine tools, the unit normal vector of feature facet between the feature datum and machining facet were multiplied to determine the fixture capability, which provide a reasonable proposal of machining setup process for multi-position rotation and multi-piece fixture design. Finally, a case study of machining setup process planning and multi-piece fixture equipment design from corporation was presented to verify the feasibility of the method that was based on the graph theory.

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