Optimization of the volumetric accuracy of high-speed computer numerical control milling with dynamic quality characteristics

2004 ◽  
Vol 218 (12) ◽  
pp. 1741-1754 ◽  
Author(s):  
F-C Chen ◽  
Y-F Tzeng
Keyword(s):  
High Speed ◽  
Computer Numerical Control ◽  
Quality Characteristics ◽  
Numerical Control ◽  
Volumetric Accuracy ◽  
Dynamic Quality ◽  
Speed Computer

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.

Quality characteristic decoupling planning of different meta-action units for computer numerical control machine tool

2019 ◽  
Vol 234 (14) ◽  
pp. 2760-2770 ◽  
Author(s):  
Yan Ran ◽  
Teng Zhang ◽  
Zongyi Mu ◽  
Genbao Zhang ◽  
Hongwei Wang ◽  
...  
Keyword(s):  
Machine Tool ◽  
Optimization Method ◽  
Computer Numerical Control ◽  
Quality Characteristics ◽  
Numerical Control ◽  
Quality Characteristic ◽  
Control Machine Tool ◽  
Action Unit ◽  
Action Units ◽  
Control Machine

Since computer numerical control machine tool is composed of multiple meta-action units to achieve one specific function, including the meta-action units' own quality, it still needs to control the coupling relationships among different meta-action units' quality characteristics to guarantee the whole machine's quality. In this article, a method of quality characteristic decoupling planning based on meta-action unit for computer numerical control machine tool was proposed. Firstly, the coupling constraint models based on meta-action unit were established. Secondly, the comprehensive coupling strengths of meta-action units were calculated and introduced into the design structure matrices. Thirdly, multidisciplinary design optimization method was adopted to obtain the optimized control sequence of different meta-action units' quality characteristics. What is more, automatic pallet changer rotary motion of computer numerical control machine tool was taken as an example to illustrate the rightness and effectiveness of this method.

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.

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.

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.

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.

scholarly journals Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

2019 ◽  
Vol 17 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Wen-Bin Zhong ◽  
Xi-Chun Luo ◽  
Wen-Long Chang ◽  
Yu-Kui Cai ◽  
Fei Ding ◽  
...  
Keyword(s):  
High Speed ◽  
Value Added ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Future Research ◽  
Numerical Control Machining ◽  
Advantages And Disadvantages ◽  
Product Surface ◽  
Function Integration ◽  
Increasing Demand

Abstract Driven by the ever increasing demand in function integration, more and more next generation high value-added products, such as head-up displays, solar concentrators and intra-ocular-lens, etc., are designed to possess freeform (i.e., non-rotational symmetric) surfaces. The toolpath, composed of high density of short linear and circular segments, is generally used in computer numerical control (CNC) systems to machine those products. However, the discontinuity between toolpath segments leads to high-frequency fluctuation of feedrate and acceleration, which will decrease the machining efficiency and product surface finish. Driven by the ever-increasing need for high-speed high-precision machining of those products, many novel toolpath interpolation and smoothing approaches have been proposed in both academia and industry, aiming to alleviate the issues caused by the conventional toolpath representation and interpolation methods. This paper provides a comprehensive review of the state-of-the-art toolpath interpolation and smoothing approaches with systematic classifications. The advantages and disadvantages of these approaches are discussed. Possible future research directions are also offered.

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