cnc machining
DESCRIPTION
At HEC Ranchi.TRANSCRIPT
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CNC MACHININGAND
SUMMER TRAINING AT HEC RANCHI
BY-NIDHI PRAWINA TIGGA
JV-B/10/1702
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CONTENTS
What are NC and CNC?CNC system elementsProperties of CNC machinesPoint-to-point tool movementsContinuous-Path tool movementsFeedback system for controlling tool
movementsTypes of CNC machinesApplication of CNC machines
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What are NC & CNC ?
Numerical control (NC) is a method of automatically
operating a manufacturing machine based on a code
letters, numbers and special characters.
The numerical data required to produce a part is provided to a machine in the form of program,
called part program or CNC (computer numerical
control).
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The program is translated into the appropriate electrical
signals for input to motors that run the machine.
A CNC machine is an numerical control machine with
the added feature of an on board computer. The computer is referred to as the machine control
unit (MCU).
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CNC SYSTEM ELEMENTS
Figure 1. Schematic illustration of the major components of a numerical control machine tool
A typical CNC system consists of the
following six elementsPart program Program input
device Machine control unit Drive system Machine tool Feedback system
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Properties of CNC machines
Based on Motion Type: Motion control -the heart of CNC. Point-to-Point or Continuous path.Based on Control Loops: Open loop or
Closed Loop.Based on Power Supply: Electric or
Hydraulic Or Pneumatic.Based on Positioning System: Incremental or Absolute.
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Point-to-Point Tool Movements
Point-to-point control systems cause the tool to move to a point on the part and execute an operation at that point only.
The tool is not in continuous contact with the part
while it is moving. Examples: drilling,
reaming, punching, boring and tapping.
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Continuous-Path Tool Movements
Continuous-path controllers cause the
tool to Maintain continuous contact with the part as the tool cuts a contour shape.
These operations include milling along any lines
at any angle, milling arcs
and lathe turning.
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Feedback Systems for Controlling Tool Movement
OPEN LOOP SYSTEM CONTROLCLOSED LOOP SYSTEM CONTROL
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Open loop system
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Closed loop system
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Types of CNC MachinesVertical Turning Lathes(6-AXIS AND 2-AXIS)
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•CNC Roll Turning & Centre Lathes
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•CNC Deep Hole Boring Machine
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APPLICATION of CNCMACHINES
CuttingDrillingMillingWeldingBoringBendingSpinningPinningGluingSewingRouting
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THANK YOU!