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(COMPUTER NUMERIC CONTROL MACHINE)

BY

REKHA GOLEY

EN 4TH

YEAR


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BHEL is the largest engineering and manufacturingenterprise in India in the energy relatedinfrastructure sector today. BHEL was established

more than 40 years ago when its first plant wassetup in Bhopal

BHEL's vision is to become a world-classengineering enterprise, committed to enhancing

stakeholder value. The company is striving to giveshape to its aspirations and fulfill theexpectations of the country to become a globalplayer.

AN OVERVIEW


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BHEL main manufacturing facilities:

Bhopal (Madhya Pradesh)

Bharat Heavy Electrical Limited, Ranipur, Haridwar(Uttarakhand)

Hyderabad (Andhra Pradesh)

Jhansi (Uttar Pradesh)

Tiruchirapalli(Tamil Nadu)

Ranipet (Tamil Nadu)

Bangalore (Karnataka)

Jagdishpur (Uttar Pradesh)

Rudrapur (Uttrakhand)

Goindwal (Punjab)

Bharat Heavy Plates and Vessels Limited (Vizag)


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Development of computerized numerical

controlled (CNC) machines is an outstanding

contribution to the manufacturing industries

Initially, the CNC technology was applied onbasic metal cutting machine like lathes,

milling machines, etc. Later, to increase the

flexibility of the machines in handling a

variety of components and to finish them in asingle setup on the same machine, CNC

machines capable of performing multiple

operations were developed.


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Numerical control (NC) is a method employed

for controlling the motions of a machine tool

slide and its auxiliary functions with input in

the form of numerical data. A computernumerical control (CNC) is a microprocessor-

based system to store and process the data

for the control of slide motions and auxiliary

functions of the machine tools The CNC system is the heart and brain of a

CNC machine which enables the operation of

various machine


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A CNC system basically consists of the

following:

Central processing unit (CPU)

Servo-control unit

Operator control panelMachine control panel

Other peripheral device

Programmable logic controller (PLC)


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It is the heart and brain of the cnc machine

It also oversees the movement of the control

axis or spindle whenever this does not matchthe programmed values, a corrective action

is taken.


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Servo control unit consist of mainly two

parts

1. Servo drive

2. Servo motor

Servo control unit generates suitable

signals as command values and servo drive

unit converts the command values.

SCU receive position feedback signal for

actual movement of the machine tool axis

from the feedback devices


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It consist of two parts

1. Video display unit:The VDU displays the

status of the various parameters of the CNC

system and the machine tool. It displays allcurrent information

2. Keyboard:Editing of part programs, tool

data, and machine parameters.

Selection of different pages for viewing.


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During program execution, the CNCcontrols the axis motion, spindle

function or tool function on a

machine tool, depending upon the

part program stored in the memory.

Prior to the starting of the machine

process, machine should first be

prepared with some specific tasks

like,,,

Establishing a correct reference point

Loading the system memory with the

required part program


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Conventionalmilling

machines


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Conventionalmilling

machines

How does the table move along X- Y- and Z- axes ?

HORIZONTAL MILLING MACHINE

ARCHITECTURE


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Higher flexibility

Increased productivity

Consistent quality

Reliable operation

Reduced manpower High accuracy

Just in time (JIT) manufacture

Automatic material handling

Lesser floor space

Increased operation safety Machining of advanced material


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THANK YOU