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.

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.

TOWARDS (DE)CONSTRUCTING 4D YANG-MILLS THEORY

2008 ◽  
Vol 23 (14n15) ◽  
pp. 2099-2106
Author(s):  
MASAFUMI FUKUMA ◽  
KEN-ICHI KATAYAMA
Keyword(s):  
Order Approximation ◽  
Zeroth Order ◽  
Yang Mills ◽  
Zeroth Order Approximation ◽  
Glueball Spectrum

We investigate 3D Yang-Mills theory coupled to an adjoint scalar, which can be regarded as a zeroth order approximation in (de)constructing 4D Yang-Mills theory. We develop a new algorithm to obtain the renormalized Hamiltonian with the Karabali-Nair variable, by carefully identifying finite local counterterms. We also discuss how this formalism can be applied to obtain glueball spectrum.

Prediction of regenerative chatter by modelling and analysis of high-speed milling

2003 ◽  
Vol 43 (14) ◽  
pp. 1437-1446 ◽  
Author(s):  
R.P.H. Faassen ◽  
N. van de Wouw ◽  
J.A.J. Oosterling ◽  
H. Nijmeijer
Keyword(s):  
High Speed ◽  
Regenerative Chatter ◽  
High Speed Milling

Research on NC Technology for High Speed Milling

2010 ◽  
Vol 44-47 ◽  
pp. 280-283
Author(s):  
Zhen Yu Zhao ◽  
Li Xin Huang ◽  
Yong Shan Xiao ◽  
Bai Liu
Keyword(s):  
High Speed ◽  
Manufacturing Industry ◽  
Numerical Control ◽  
Post Processing ◽  
High Speed Milling ◽  
Machining Center ◽  
Look Ahead ◽  
Motion Control Card ◽  
Improved Methods ◽  
Control Post

In the manufacturing industry, high speed milling plays a very important role. The paper introduced a number of essential core component of the key technologies in high speed machining center such as powerful computer numerical control systems, motion control card, post –processing method, processed trajectory control technology (Look Ahead) and high speed processing of programming. The speed control, post processing and look-ahead control are focused on considering, and the corresponding improved methods are brought forward.

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.

VERNE - a five-axis parallel kinematics milling machine

2005 ◽  
Vol 219 (3) ◽  
pp. 327-336 ◽  
Author(s):  
M Terrier ◽  
M Giménez ◽  
J-Y Hascoët
Keyword(s):  
High Speed ◽  
Experimental Approach ◽  
Coordinate Measuring Machine ◽  
Direct Consequence ◽  
Numerical Control ◽  
Parallel Kinematics ◽  
High Speed Milling ◽  
Axis Parallel ◽  
Measuring Machine ◽  
Five Axis

Ten years ago a new kind of machine tool was presented in Chicago, based on parallel kinematics architectures. Since then, many of these parallel kinematics machines (PKMs) have been developed around the world. Their main interest lies in their high dynamic characteristics, which could help in going faster in high-speed milling. In order to develop high-speed milling on PKM tools and to highlight their potentialities, the French laboratory IRCCyN is now equipped with the VERNE. This PKM tool has been developed by the Spanish company Fatronik. However, the high-speed milling production process is a complex task, in which a great number of parameters influence the final precision of the part and the productivity of the machine. For example, the NC (numerical control) and computer-aided manufacturing (CAM) parameters (feed forward, milling strategies, etc.), the piece geometry, the machine structure, the tool, etc., have a direct consequence on the final part. Hence, a method has been developed in order to check the capability of the machine (either serial or parallel) in milling, which relies on two approaches. The first one is an experimental approach (either using a coordinate measuring machine or acquiring the output axis encoders), while the second one is a simulated approach. After introducing the kinematics of the VERNE, the experimental approach performed so far will be presented.

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