This document provides information about CNC systems at BHEL HERP in Varanasi, India. It discusses the historical background of BHEL HERP, introducing it as a prominent Indian company established in 1984. It then describes the key components of a CNC system, including the numerical control unit, servo control unit, machine control panel, and programmable logic controller. It explains the advantages of CNC machines in increasing productivity, accuracy, and reducing scrap rates and non-productive time.

1. Title Layout
SUBTITLE
SUBMITTED BY :-
PRATIK SETH
ELECTRICAL AND ELECTRONICS ENGINEERING

2. BHEL (HERP), VARANASI

3. CONTENTS
• HISTORICAL BACKGROUND
• INTRODUCTION
• RANGE OF PRODUCTS/SERVICES
• CNC SYSTEM
• ADVANTAGE OF CNC MACHINES
• NUMERICAL CONTROL UNIT
• SERVO-CONTROL UNIT
• MACHINE CONTROL PANEL
• PROGRAMMABLE LOGIC CONTROLLER

4. HISTORICAL BACKGROUND
• Foundation Day : 26.09.1984
• Production Commencement : 01.04.1986
• Area : 29.80 Acres
• Manpower : Executives – 45
: Supervisors-29
: Workers–79
: Total-153
• Accreditation TO : ISO-9001-2000 ( During
ISO Certification :ISO-14001 2003 )
:OHSAS-18001

5. INTRODUCTION
• BHEL is one of the most prominent companies of India.
• it is also known as Bharat Heavy Electricals Limited and is a gas and steam
turbine manufacturer in India.
• It is one of India's nine largest Public Sector Undertakings or PSUs, known
as the ‘Navratna’ or ‘The Nine Jewels’.

6. RANGE OF PRODUCTS/SERVICES
• Bowl Mill spares for XRP/XRS 623HP, 703HP, 803HP, 883HP, 1003HP Mills.(use to crush
coal)
• Spares for Boiler Auxiliaries as Coal Burners, Fuel Piping, Air Preheater etc.
• Hydro Turbine component machining as Guide Vanes, Guide Bearings, Guide Bearing
Segment, Bearing Housing, Thrust Pad etc.
• Steam Turbine Components as Boiler Feed Pump Drive, Tools &Tackles, Parting Plate,
fasteners, sealing, Ring, LP Shaft seals.
• Limiter Assembly, Oil Filter Assembly & Speed Changer Assembly of Governing System.
• Single & Twin rollers for transformers.
• Constant Load Hangers and Variable Load Hangers

7. CNC SYSTEM AT BHEL HERP, VARANASI

8. ADVANTAGE OF CNC MACHINES
•Higher flexibility
•Increased productivity
•Reduced scrap rate
•Reliable operation
•Reduced non productive time
•Reduced manpower
•Shorter cycle time
•High accuracy
•Automatic material handling
•Lesser floor space
•Increased operation safety

9. A CNC SUSTEM BASICALLY CONSIST OF FOLLOWING
•Numerical Control unit (NCU)
•Servo-control unit
1. Open loop system
2. Closed loop system
•Operator control panel
•Machine control panel
•Programmable logic controller (PLC)

10. Numerical Control Unit (NCU)
•Execution of the NC programming.
•The number form a programme of instruction designed for a particular job.
•Maintaining communication with the I/Os.
•It accepts the information stored in the memory as part program.

12. Servo-Control Unit
• The decoded position and velocity control signals, generated by the NCU
for the axis movement forms the input to the servo-control unit.
• This unit in turn generates suitable signals as command values.

13. OPEN LOOP SYSTEM

14. CLOSED LOOP SYSTEM

15. Machine Control Panel
• It is the direct interface between operator and the NC system.
• It is Enable the operation of the machine through the CNC system.
• Establishing a correct reference point.
• Loading the system memory with the required part programme.
• Loading and checking of tool offsets, zero offsets, etc.

18. Programmable Logic Controller (PLC)
• A PLC matches the NC to the machine. PLCs were basically introduced as replacement
for hard wired relay control panels.
• PLC help us in reducing the Hardwired controls of machine.
• They provide a platform from where implementation of logic as well as their diagnosis
(fault finding) becomes much simple.
• The PLC are reusable and can be programmed to perform various functions like On
Delay Timers, Off Delay timers, Binary counter, BCD Counters etc.

20. THANK YOU