Static and Dynamic Characteristic Simulation of Feed System Driven by Linear Motor in High Speed Computer Numerical Control Lathe

2013 ◽  
Vol 11 (7) ◽  
Author(s):  
Yang Zeqing ◽  
Liu Libing ◽  
Wang Zuojie ◽  
Chen Yingshu ◽  
Xiao Quanyang
Keyword(s):  
Dynamic Characteristic ◽  
High Speed ◽  
Computer Numerical Control ◽  
Linear Motor ◽  
Numerical Control ◽  
Feed System ◽  
Speed Computer

Simulation Analysis of Feed System Control Characteristics in High-Speed Computer Numerical Control Lathe Based on MATLAB

2013 ◽  
Vol 278-280 ◽  
pp. 1620-1626
Author(s):  
Ze Qing Yang ◽  
Li Bing Liu ◽  
Zuo Jie Wang ◽  
Song Zhang
Keyword(s):  
Response Time ◽  
High Speed ◽  
Dynamic Stiffness ◽  
Linear Motor ◽  
Numerical Control ◽  
System Control ◽  
Control Parameters ◽  
Feed System ◽  
Integral Response ◽  
Speed Computer

In order to determine the high-speed Computer Numerical Control (CNC) lathe linear servo system control parameters reasonably, the linear motor feed system control model was established based on analysis of high-speed linear feed system control principle, and the linear motor feed system transfer function was established, and servo dynamic stiffness factors were analyzed. The control parameters of the servo system and actuating mechanism parameters of feed system on the effect of the linear motor servo dynamic stiffness were analyzed using MATLAB software. The simulation results show that the position loop proportional gain, speed loop proportional gain and speed loop integral response time are the biggest Influence factors on servo dynamic stiffness. The displacement response is reduced under the cutting interference force step inputting, while the position loop proportional gain, speed loop proportional gain and speed loop integral response time are increased, and the servo dynamic stiffness is increased, the number of system oscillation is also reduced, and the system tends to be stable.

A theory to support the high-speed computer numerical control machining of corner profiles

2002 ◽  
Vol 216 (4) ◽  
pp. 643-647 ◽  
Author(s):  
M Loftus ◽  
D Wang
Keyword(s):  
Mathematical Model ◽  
High Speed ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Loading Conditions ◽  
Milling Cutter ◽  
Numerical Control Machining ◽  
High Speed Milling ◽  
Speed Computer

This paper presents a new mathematical model for the motion of a milling cutter as it generates an obtuse corner profile. The model describes the different phases of cutter contact and can be used to optimize the speed of machining and to protect the cutters from adverse loading conditions in high-speed milling applications.

FPGA-Based Intelligent Software Hardening Chip for Computer Numerical Control System

2011 ◽  
Vol 105-107 ◽  
pp. 2217-2220
Author(s):  
Mu Lan Wang ◽  
Jian Min Zuo ◽  
Kun Liu ◽  
Xing Hua Zhu
Keyword(s):  
High Speed ◽  
High Performance ◽  
Large Scale ◽  
Position Control ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Cnc System ◽  
Intelligent Software

In order to meet the development demands for high-speed and high-precision of Computer Numerical Control (CNC) machine tools, the equipped CNC systems begin to employ the technical route of software hardening. Making full use of the advanced performance of Large Scale Integrated Circuits (LSIC), this paper puts forward using Field Programmable Gates Array (FPGA) for the functional modules of CNC system, which is called Intelligent Software Hardening Chip (ISHC). The CNC system architecture with high performance is constructed based on the open system thought and ISHCs. The corresponding programs can be designed with Very high speed integrate circuit Hardware Description Language (VHDL) and downloaded into the FPGA. These hardening modules, including the arithmetic module, contour interpolation module, position control module and so on, demonstrate that the proposed schemes are reasonable and feasibility.

Development of a Smart Computer Numerical Control System

2013 ◽  
Author(s):  
Zhiqian Sang ◽  
Xun Xu
Keyword(s):  
Real Time ◽  
High Speed ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Machining Process ◽  
Cnc Machine ◽  
Field Bus ◽  
Nc System ◽  
Tool Paths ◽  
Cnc Controller

Traditional Computer Numerical Control (CNC) machines use ISO6983 (G/M code) for part programming. G/M code has a number of drawbacks and one of them is lack of interoperability. The Standard for the Exchange of Product for NC (STEP-NC) as a potential replacement for G/M code aims to provide a unified and interoperable data model for CNC. In a modern CNC machine tool, more and more motors, actuators and sensors are implemented and connected to the NC system, which leads to large quantity of data being transmitted. The real-time Ethernet field-bus is faster and more deterministic and can fulfill the requirement of data transmission in the high-speed and high-precision machining scenarios. It can provide more determinism on communication, openness, interoperability and reliability than a traditional field-bus. With a traditional CNC system using G/M code, when the machining is interrupted by incidents, restarting the machining process is time-consuming and highly experience-dependent. The proposed CNC controller can generate just-in-time tool paths for feature-based machining from a STEP-NC file. When machining stoppage occurs, the system can recover from stoppage incidents with minimum human intervention. This is done by generating new tool paths for the remaining machining process with or without the availability of the original cutting tool. The system uses a real-time Ethernet field-bus as the connection between the controller and the motors.

A Novel Evaluation Method on the Precision of Linear Motor Feed System in High-Speed Machine Tools

2016 ◽  
Vol 836-837 ◽  
pp. 220-227 ◽  
Author(s):  
Xiao Jun Yang ◽  
Yan Li ◽  
Cheng Fang Ma ◽  
Dun Lv ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Mechanical System ◽  
Machine Tools ◽  
High Speed ◽  
Evaluation Method ◽  
Linear Motor ◽  
Feed System ◽  
Dynamic Precision ◽  
Transmission Structure ◽  
Accuracy And Repeatability ◽  
High Speed Machine

The linear motor feed system can realize high-precision motion with high-speed and high-acceleration, which has a broad application in high-speed machine tools. In its unique zero transmission structure, the motor is connected directly with the mechanical system. The thrust harmonics and other disturbances act on the motor mover directly, which makes the tracking fluctuation more prominent. The traditional accuracy and repeatability of positioning cannot reflect the precision of the linear motor feed system in the process of high-speed movement. In this paper, a novel precision evaluation method which takes the dynamic precision as the index is proposed for the linear motor feed system in high-speed machine tools. The performance and precision of linear motor feed system are evaluated by the transient error, steady-state follow error and tracking fluctuation, respectively. Then the servo control model is established oriented to dynamic precision. The influences of NC instructions, servo system and mechanical system on the dynamic precision are discussed. It can be obtained that this new evaluation method on the precision can evaluate systematically the performance of the linear motor feed system in high-speed machine tools. Meanwhile it can reveal efficiently main factors which lead to the decline of dynamic precision and propose effective improvement methods.

Calculation and Analysis on the Key Parameters of High-Speed Linear Motor Feed System

2011 ◽  
Vol 189-193 ◽  
pp. 2046-2049
Author(s):  
Jun Hong Cheng
Keyword(s):  
Machine Tool ◽  
Theoretical Basis ◽  
High Speed ◽  
Influence Factors ◽  
Linear Motor ◽  
High Speed Machining ◽  
Feed System ◽  
Technical Parameters ◽  
Modern Manufacturing ◽  
High Speed Machine

High-speed machining is playing a more important role in modern manufacturing technology. The feed system of high-speed machine tool is one of the most important components. The linear motor has been widely used in high-speed machine tool. In this paper，a kind of machine tool feed system directly driven by a linear motor is introduced，and its technical parameters are analyzed and calculated. The main parameters’ influence factors and best scope are given out.These results can offer theoretical basis for manufacturing machining technology.

Reconfigurable Design and Implementation of Gravure Engraving Motion Controller Based on FPGA

2011 ◽  
Vol 317-319 ◽  
pp. 1518-1524
Author(s):  
Liang Liu ◽  
Zhao Yao Zhou ◽  
Ke Jing He ◽  
Wen Jiong Cao ◽  
Xue Feng Qin
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Numerical Control ◽  
Motion Controller ◽  
Reconfigurable Logic ◽  
Description Language ◽  
Reconfigurable Design ◽  
Acceleration And Deceleration ◽  
Hardware Description ◽  
Speed Computer

Reconfigurable logic has gained relevance in high-speed computer numerical control (CNC) digital controller. In this paper, a design of three-axis high speed gravure engraving machine motion controller based on programmable logical device is proposed. In the design of the hardware, the prevalent technology of Filed Programmable Gate Array is applied, which enhances the flexibility of the hardware. All the circuits and algorithms are developed using hardware description language. A novel solution for acceleration and deceleration control of servo motors is implemented in FPGA. This system is already applied in a high speed (8K) gravure engraving machine, and the results prove that this controller based on a low-cost FPGA platform is highly precise and of great universality.

Research on Precision Experimental Table for CO2 Laser Machining Microfluidic Chip

2013 ◽  
Vol 316-317 ◽  
pp. 1002-1006
Author(s):  
Heng Fu Xiang ◽  
Li Jun Zhang
Keyword(s):  
Microfluidic Chip ◽  
High Speed ◽  
Forecast Model ◽  
Linear Motor ◽  
Laser Machining ◽  
Real Time Control ◽  
Feed System ◽  
High Position ◽  
Position Accuracy ◽  
Time Control

In order to experiment study of CO2 laser machining polymer-based microfluidic chip, a laser micro-processing precision experimental table was built. A servo feed system directly driven by linear motor was designed to achieve high speed and high position accuracy. Dual-CPU open CNC system used Industrial Personal Computer(IPC) as master computer and PMAC controller as slave computer was constructed to ensure system real-time control. In order to increase position accuracy of precision table, a forecast model of the linear motor position error was put forward based on LSSVM and error compensation was processed. Research results indicated that the use of radial basis function of the LSSVM could improve linear motor position accuracy.

Experimental study of stability prediction for high-speed robotic milling of aluminum

2019 ◽  
Vol 26 (7-8) ◽  
pp. 387-398 ◽  
Author(s):  
Daxian Hao ◽  
Wei Wang ◽  
Zhaoheng Liu ◽  
Chao Yun
Keyword(s):  
High Speed ◽  
Order Approximation ◽  
Low Frequency ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Zeroth Order ◽  
Regenerative Chatter ◽  
High Speed Milling ◽  
Zeroth Order Approximation ◽  
Robotic Milling

It has been fully demonstrated that the regenerative chatter theory is applicable for predicting chatter-free milling parameters for computer numerical control machine tools, but researchers are still arguing whether it is effective for robotic milling processes. The main reason is that the robot’s modes greatly shift, depending on its varying dynamic parameters and joint configurations. More experimental investigations are required to study and better understand the mechanism of vibration in robotic machining. The present paper is focusing on finding experimental support for chatter-free prediction in robot high-speed milling by the regenerative chatter theory. Modal tests are first conducted on a milling robot and used to predict stability lobes by zeroth order approximation. A number of high-speed slotting tests are then carried out to verify the prediction results. Thus, the regenerative chatter theory is proved to be also applicable to robotic high-speed milling. Furthermore, low-frequency modes of the robot structure are investigated by more modal experiments involving a laser tracker and a displacement sensor. The low-frequency modes are identified as the main part of the prediction error of the zeroth order approximation method, which could also be dominant in low-speed robotic milling processes. In addition, robots are different from computer numerical control machines in terms of stiffness, trajectory following error, forced vibration, and motion coupling. These long-period trend terms have to be carefully taken into account in the regenerative chatter theory for robotic high-speed milling.

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