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CNC MACHINING AND SUMMER TRAINING AT HEC RANCHI BY- NIDHI PRAWINA TIGGA JV-B/10/1702

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Page 1: CNC machining

CNC MACHININGAND

SUMMER TRAINING AT HEC RANCHI

BY-NIDHI PRAWINA TIGGA

JV-B/10/1702

Page 2: CNC machining

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

Page 3: CNC machining

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).

Page 4: CNC machining

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).

Page 5: CNC machining

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

Page 6: CNC machining

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.

Page 7: CNC machining

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.

Page 8: CNC machining

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.

Page 9: CNC machining

Feedback Systems for Controlling Tool Movement

OPEN LOOP SYSTEM CONTROLCLOSED LOOP SYSTEM CONTROL

Page 10: CNC machining

Open loop system

Page 11: CNC machining

Closed loop system

Page 12: CNC machining

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

Page 15: CNC machining

APPLICATION of CNCMACHINES

CuttingDrillingMillingWeldingBoringBendingSpinningPinningGluingSewingRouting

Page 16: CNC machining

THANK YOU!