Theory and Design of CNC Systems Part 12 ppt

... by real-time programming techniques. 392 10 Design of PC-NC and Open CNC systems by modularization of system components and standardization of platforms and interfaces between modules, it is necessary ... com- munication task of MMI is designed as application software based on Windows 95. Therefore, on the side of MMI, the communication task can be designed easily by 388...

Ngày tải lên: 11/08/2014, 20:21

... execution algo- rithms and implementation by pseudo-code. In this chapter, only the design of NCK will be described and the overall design of the CNC system where the PLC and MMI units are included ... reference on design of digital drive systems. Figure 5.14 shows the architecture of a speed feedforward controller where the posi- tion command, α w ,isfiltered and the...

Ngày tải lên: 11/08/2014, 20:21

... goal of using STEP-NC and other standards to develop an open database of all the information necessary to design and manufacture a part. While NIST understands the value of standards-based data ... Development of Korea STEP-NC: STEP -CNC system for milling • Development of TurnSTEP: STEP -CNC system for turning • Development of the data model for turning (ISO14649 Part...

Ngày tải lên: 11/08/2014, 20:21

... 107 128 , 187 ADCBI, 107, 108, 128 –155, 187, 211 ADCBI-type NCK – architecture, 211 address, 237 aging, 328 AGV, 4 AIM, 404 and – AND, 260 and not – ANDN, 261 and stack – ANDS, 266 application layer, ... function, 56 soft bus, 30, 416 soft PLC, 247–249 soft real-time system, 319 Soft-NC, 30, 248, 353, 355, 357, 359, 362–364, 366–369, 372–377, 388, 392, 393, 416 software model, 242 so...

Ngày tải lên: 11/08/2014, 20:21

... Open CNC 353 10.1 Introduction . . 353 10.2 DesignofSoftwareArchitecture 356 10.2.1 CNCSystemModeling 356 10.3 DesignofSoft-NCSystem 359 10.3.1 Design of Task Module . 359 10.3.2 DesignoftheSystemKernel ... 1.1. Contents Abbreviations xvii Part I Principles and NCK Design of CNC Systems 1 Introduction to NC Systems 3 1.1 Introduction . . 3 1.2 TheHistoryofNCandNCMachineToo...

Ngày tải lên: 11/08/2014, 20:21

... detailed functions of any particular CNC. 2.2 Part Program Although the standard exists for generating a CNC part program, sequentially listing the commands for executing CNC, each CNC maker has, ... representative indicator that shows the design concept and the functional aspect of a CNC and is a big part of 33 26 1 Introduction to NC Systems System memory Part...

Ngày tải lên: 11/08/2014, 20:21

... the interpreter of the CNC system is the soft- ware module of the NCK unit that interprets the part program consisting of G&M- code commands and related addresses such as S, T, and F. The interpreter ... the internal behavior of the interpreter, it is necessary to understand the structure of a part pro- gram and the commands used therein. In a CNC system, various c...

Ngày tải lên: 11/08/2014, 20:21

... number of the pulses from rough interpolation and Acc/Dec control at time i. t ipo is the it- eration time of rough interpolation and N is the ratio of the iteration time of rough interpolation and ... 4 Acceleration and Deceleration In order to smooth the movement of a machine, the acceleration and deceleration for the movementof the machineaxes should be controlled. For...

Ngày tải lên: 11/08/2014, 20:21

... Acceleration and Deceleration trajectory is inversely proportional to the feedrate and sudden changes of feedrate result in reduction of accuracy of the CNC equipment. In the ADCBI type of NCK, the ... connected it is possible to classify pairs of blocks into twelve types depending on the type of block (e.g. normal block and short block) and the difference of commanded...

Ngày tải lên: 11/08/2014, 20:21

... methods and the method of designing a soft PLC system will be described together with design of Soft-NC in the later in this textbook. In Soft-NC, a PC is used as the hardware plat- form and all CNC ... Soft NC, Soft NC and Soft PLC can be regarded as the same system. Soft PLC which is made by a user interface and the PLC kernel based on the IEC1131-3 can be regarded as partia...

Ngày tải lên: 11/08/2014, 20:21