REKHA GOLEY FINA;trng ppt

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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