Accurate Estimation of Cutting Time Based on Control Principle of Machine Tool

2016 ◽  
Vol 10 (3) ◽  
pp. 429-437 ◽  
Author(s):  
Kosuke Saito ◽  
◽  
Hideki Aoyama ◽  
Noriaki Sano ◽  
◽  
...  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Tool Path ◽  
Estimation Error ◽  
Numerical Control ◽  
Accurate Estimation ◽  
Flexible System ◽  
Acceleration And Deceleration ◽  
Nc Machine ◽  
Control Principle

The accurate estimation of cutting time before beginning a cutting process is necessary to improve the productivity of machining. Commercial computer-aided machining (CAM) systems estimate the cutting time by dividing the tool path length by the designated feed rate in a numerical control (NC) program. However, the actual cutting time generally exceeds the estimated cutting time for curved surfaces because of the acceleration and deceleration of the NC machine tool. There are systems that estimate cutting time while considering acceleration and deceleration along the controlled axes, but these are applicable only to particular machine tools. In this study, a flexible system for the accurate estimation of cutting time, based on the control principle of a machine tool, is developed. Experiments to estimate cutting time are conducted for the machining of complex shapes using two different NC machine tools. The actual cutting time is compared with the cutting time estimated by the developed system and that by a commercial CAM system. The estimation error of the proposed system is only 7%, while that of the commercial CAM system is 51%.

Study of Virtual Numerical Control Milling Simulation System

2009 ◽  
Vol 407-408 ◽  
pp. 174-179
Author(s):  
Xiu Lin Sui ◽  
Zheng Wei Kong ◽  
Jia Tai Zhang ◽  
Xiao Ping Yang
Keyword(s):  
Machine Tool ◽  
Virtual Machine ◽  
Machine Tools ◽  
Tool Path ◽  
Simulation System ◽  
Numerical Control ◽  
Processing Scheme ◽  
Second Development ◽  
Milling Simulation ◽  
Nc Machine

Virtual numerical control milling simulation system, based on UG, is studied oriented to low utilization of NC machines. A virtual machine tools library, standard fixture library and visual machine tool processing environment were established by the second development techniques of UG and VC++. Through the example of XH715 NC machine center, tool path and motion of miller were simulated separately; at last processing scheme was evaluated and optimized. The experimental results show this system possesses good utility, and the utilization of machine tools could thus be improved.

Estimation System of Accurate Cutting Time Based on Actual Feedrate Identification

2012 ◽  
Vol 516 ◽  
pp. 113-118
Author(s):  
Kosuke Saito ◽  
Hideki Aoyama ◽  
Noriaki Sano
Keyword(s):  
Machine Tool ◽  
Tool Path ◽  
Estimation Error ◽  
Nc Machine Tool ◽  
Complex Shapes ◽  
Acceleration And Deceleration ◽  
Nc Machine ◽  
Productivity Estimation ◽  
Estimation System ◽  
Cam Systems

The estimation of accurate cutting time before cutting is important for improving productivity. Estimation of cutting time calculated by length of tool path / command feedrate can easily be obtained in commercial CAM systems because NC programs contain machining information, such as tool positions, feedrate, etc. However, the actual cutting time is longer than cutting time calculated by length of tool path / command feedrate due to acceleration and deceleration which occurs along the tool path. In this study, an estimation system of accurate cutting time based on the control system of the machine tool is proposed. Experiments were conducted to cut complex shapes using the NC machine tool to compare the actual cutting time, estimated cutting time of commercial CAM systems and those of the proposed system. The estimation error of the proposed system was only 2 %, while the estimation error of a commercial CAM system was 51 %.

Error correction technique for numerical control machine tools based on the simplex method

2021 ◽  
pp. 095440542110281
Author(s):  
Hongwei Liu ◽  
Rui Yang ◽  
Pingjiang Wang ◽  
Jihong Chen ◽  
Hua Xiang
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Simplex Method ◽  
Tool Path ◽  
Repeated Measurements ◽  
Numerical Control ◽  
Machining Accuracy ◽  
Correction Technique ◽  
Fluctuation Range ◽  
Nc Machine

The objective of this research is to develop a novel correction mechanism to reduce the fluctuation range of tools in numerical control (NC) machining. Error compensation is an effective method to improve the machining accuracy of a machine tool. If the difference between two adjacent compensation data is too large, the fluctuation range of the tool will increase, which will seriously affect the surface quality of the machined parts in mechanical machining. The methodology used in compensation data processing is a simplex method of linear programming. This method reduces the fluctuation range of the tool and optimizes the tool path. The important aspect of software error compensation is to modify the initial compensation data by using an iterative method, and then the corrected tool path data are converted into actual compensated NC codes by using a postprocessor, which is implemented on the compensation module to ensure a smooth running path of the tool. The generated, calibrated, and amended NC codes were immediately fed to the machine tool controller. This technique was verified by using repeated measurements. The results of the experiments demonstrate efficient compensation and significant improvement in the machining accuracy of the NC machine tool.

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.

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.

Reliability Assessment of Numerical Control Machine Tools Using Weibull Mixture Models

2011 ◽  
Vol 181-182 ◽  
pp. 161-165 ◽  
Author(s):  
Zhi Ming Wang ◽  
Jian Guo Yang
Keyword(s):  
Machine Tool ◽  
Mixture Models ◽  
Machine Tools ◽  
Information Criterion ◽  
Numerical Control ◽  
Single Model ◽  
Weibull Models ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Mean Square Errors

Weibull distribution is one of the most widely used model in reliability analysis of NC machine tools. In order to assess the reliability of NC machine tool, Generalized Expectation Maximization (GEM) algorithm is used to estimate parameters of mixture Weibull models. Akaike information criterion (AIC) and Bayesian information criterion (BIC) are used as comprehensive criteria to select the number of subpopulations of mixture models. The results show that mixture models are more suitable to assess reliability of NC machine tools than that of single model. Root mean square errors (RMSE) of mixture models reduce by 87.5% than that of single model. Reliability evaluation results of machine tool, such as MTBF etc., are given.

Research and Application of NC Machine Tool Energy Consumption Control Optimization

2013 ◽  
Vol 579-580 ◽  
pp. 314-319
Author(s):  
Xiu Ling Xu ◽  
Hong Liang Wang ◽  
Tian Biao Yu
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Machine Tool ◽  
Machine Tools ◽  
Numerical Control ◽  
Machining Process ◽  
Numerical Control System ◽  
Control Logic ◽  
Nc Machine Tool ◽  
Nc Machine

The numerical control machine tool, which is a typical energy-using product, because there are all sorts of energy loss and auxiliary functions, has low efficiency in machining process. Author makes a study of NC machine tool energy consumption controlling. With simens840Dsl numerical control system as an example, based on the analysis of CNC system control principle, according to processing characteristic of the part, the macro program is wrote to optimize dynamic characteristics of NC machine tool. According to the machine idle time in different work condition, three energy-saving control profiles are formulated, including machine standby, NC standby, auto shut off. By the formulation of the corresponding PLC control logic, low energy consumption of intelligent control of NC machine tool is realized. Integrate PAC3200/4200 multi-function meter in NC machine tools, quantitative measurement and analysis of energy consumption for numerical control system and ancillary equipment can be implemented, and machine tool real-time energy data can be obtained. This scheme has been successfully applied in long-men portable CNC machine tools, and obtained the ideal effect: to realize the optimize control of energy consumption, improve the performance of the machine tool, become more market competitiveness.

scholarly journals Performances and Shapes of Acceleration-deceleration Curve of Kinematical Linkages

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Mobile Element ◽  
Industrial Robots ◽  
Numerical Control ◽  
Design Stage ◽  
Contour Error ◽  
Maximum Acceleration ◽  
Positioning Accuracy ◽  
Acceleration And Deceleration

The transient duty has a very important role within the kinematical linkages of the numerical control machine tools and industrial robots. The acceleration and deceleration of the movable element of the kinematical linkage participates directly to achieving the positioning accuracy and to the path error. This work presents the main shapes of the acceleration- deceleration curve of the kinematical linkage, as well as their performances. Shapes of the acceleration-deceleration curve are presented for positioning linkages as well as for contouring linkages. The extent of influence upon the contour error in case of the linear and exponential acceleration-deceleration of kinematical linkage is also presented. The works is also giving recommendations on the way of choosing the type of curve being used in case of various transient processes, by the machine tool builders, with a view to obtaining high dynamical performances. In general, the recommendations are considering the inertia of the mobile element and the imposed path error. By knowing the acceleration shape, the machine tool designer and builder can know, even from the design stage, the area of the transient duty where the acceleration is maximal. The maximum acceleration imposes the rate of the impulsion torque of the drive servomotor based on which the kinematical linkage is sized, in terms of its components.

scholarly journals The Errors Recognition and Compensation for the Numerical Control Machine Tools Based on Laser Testing Technology

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 857-862
Author(s):  
Qian Gao ◽  
Pingchuan Zhang
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Laser Interferometer ◽  
Numerical Control ◽  
Control Machine Tool ◽  
Nc Machine Tool ◽  
Testing Technology ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Control Machine

Abstract To improve the accuracy of numerical control machine tools error, this paper studies the application of laser testing technology in numerical control machine tool, and put forward a laser interferometer automatic aiming system which can conduct space error measurement. The system, in the process of the NC machine tool operating, can measure the machine tool space curve through changing the direction of the laser. The principle of laser interferometer and matlab analysis are adopted, through the experiment of laser interference technology in the numerical control machine tool, the law curve of error in NC machine tools is obtained, getting the method of error of NC machine tools. When conducting laser testing error experiment in NC machine tool, the results show that the laser testing can measure aggregated error and thermal error of NC machine tool better, with small control of environment and high accuracy of measurement.

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