Theory and Design of CNC Systems Part 9 potx

... task is called CNC programming. 8.3.1 The Sequence of Part Programming Roughly, CNC programming is composed of the generation of a process plan from a part drawing and the generation of the part program. ... used on the shop floor and has a good effect on productivity. In this text book, the design and development of Shopfloor Oriented Programming systems embedded...

Ngày tải lên: 11/08/2014, 20:21

... 54 G 89, 54 G90, 41, 43, 45, 54 G91, 41, 43, 45 G92, 54 G94, 54 G96, 53 G97, 53 G98, 54 G 99, 54 G&M code, 397 G&M code – difficult traceability, 398 G&M code – information loss, 397 G&M ... 26– 29, 1 09, 1 59, 187–226 NURBS, 59 61, 99 –101, 103, 105 NURBS – interpolation, 59, 98 , 99 , 102 NURBS – interpolation algorithm, 101 NURBS – surface machining, 61 OAC, 30 of in...

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... 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 ... Eq. 3. 79. Δφ = 2 √ 2 κ h (3. 79) If the length of the partial curve Δ s is approximated by the length of the line PQ, the curvature is summarized as Eq. 3.80 based on Eq. 3...

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... the feedrate of blocks. The end speed of N1, F E1 , and the start speed of N2, F S2 are calculated using Eq. 4 .92 . F E1 = Q·F 1 ,F S2 = Q·F 2 (4 .92 ) The corner speed from Eq. 4 .92 is used to ... speed and the speed of the beginning of Block N2. The time spent to reach F  from 0 in a short block, T A1 ,is computed by Eq. 4. 69 and the time spent to reach the commanded fe...

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... Open CNC 353 10.1 Introduction . . 353 10.2 DesignofSoftwareArchitecture 356 10.2.1 CNCSystemModeling 356 10.3 DesignofSoft-NCSystem 3 59 10.3.1 Design of Task Module . 3 59 10.3.2 DesignoftheSystemKernel ... 155 Contents xv 9. 8.2 MessageSystem 338 9. 9 KeyPerformanceIndices 340 9. 9.1 TaskSwitchingTime 340 9. 9.2 ContextSwitchingTime 341 9. 9.3 Semaphore ShufflingTime 341 9. 9....

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... the concept of Soft-NC is applied. The CNC shown in Fig. 1. 19 is designed based on the concept of modular- ization, standardization, and distributed processing and uses STEP-compatible part programs ... 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 executi...

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... Results of Stairs Approximation interpolation algorithm step D Δ x Δ y Δ X f Δ Y f X Y 0 0 1 – 19 10 10 0 10 1 1 3 – 19 9 10 1 10 2 –18 3 –17 9 9 1 9 3 –15 5 –17 8 9 2 9 4 –10 7 –17 7 9 3 9 5 –3 9 –17 ... –17 6 9 4 9 6 6 1 –17 5 9 5 9 7 –11 11 –15 5 8 5 8 8 0 13 –15 4 8 6 8 9 13 15 –15 3 8 7 8 10 –2 15 –13 3 7 7 7 11 13 17 –13 2 7 8 7 12 0 17 –11 2 6 8 6 13 17 19...

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... 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 ... call the sub program and user-defined G-code 6.2 Architecture of ACDAI-type NCK 193 Input to interpreter A part program is input to the Interpreter and the composition...

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... 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...

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... minimized and in which the number of tool changes is minimized, verifying tool paths and the finished part, and estimating machining time based on the minimum user input. 320 9 CNC Architecture Design time ... sequence of lines or arcs and is used for visual verification of the toolpath of a part program (see Fig. 8.19a). It provides the functions for checking for colli...

Ngày tải lên: 11/08/2014, 20:21