ComputerAided Manufacturing CNC (计算机辅助制造数控)

ComputerComputer--Aided ManufacturingAided Manufacturing

IntroductionIntroduction

Numerical Control Numerical Control

Definition, advantagesDefinition, advantages

Types of NC control systems Types of NC control systems

Motion and Coordinate systemMotion and Coordinate system

NC part programmingNC part programming

Fundamentals of NC programmingFundamentals of NC programming

ExampleExample

Loading Program in:Loading Program in:Loading Program in:Loading Program in:

Computerized Numerical ControlComputerized Numerical Control

Direct Numerical ControlDirect Numerical Control

Computer-Computer-Aided part programmingAided part programming

Computer-Computer-Aided Part programmingAided Part programming

CAD-CAD-CAM based part programmingCAM based part programming

Reference: Singh, N. (1996), “Systems approach to cReference: Singh, N. (1996), “Systems approach to computeromputer--

integrated design and manufacturing”, John Wiley & integrated design and manufacturing”, John Wiley & Sons.Sons.

Metal cutting machinesMetal cutting machines

RelativeRelative motionmotion betweenbetween cuttingcutting tooltool andand workwork piecepiece byby forcingforcing aa

sharpsharp cuttingcutting edgeedge intointo thethe work-work-piecepiece..

ProblemsProblems::

MetalsMetals areare veryvery hardhard..

MotionMotion betweenbetween tooltool andand work-work-piecepiece shouldshould bebe atat sufficientlysufficiently highhigh raterate

TemporaryTemporary solutionsolution:: PowerPower drivendriven machinesmachines (machine(machine tools)tools) areare

capablecapable ofof generatinggenerating highhigh forcesforces required,required, butbut toto useuse aa machinemachine tool,tool,

wewe