1 PROJECT REPORTFUNCTIONING OF LADLE TURRET IN CONTINUOUS CASTING SHOP, SMS IIA Projec t re port submitted in part ial fulfillment of the Re quirements forManagement D evelopment Pr ogram for M T (T ech) Prepared By BRAHMANANDA REDDY SAGILI MT (TECH)EMP . NO. : 123140, SMS II (CCD) Under the esteemed Guidance of SRI K.V. SIVAPRASADAGM (CCD-MECH), SMS IITRAINING AND DEVELOPMENT CENTRE VISAKHAPATNAM STEEL PLANT VISAKHAPATNAM.
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PROJECT REPORT
FUNCTIONING OF LADLE TURRET
IN
CONTINUOUS CASTING SHOP, SMS II
A Project report submitted in partial fulfillment of the Requirements for
Management Development Program for MT (Tech)
Prepared By
BRAHMANANDA REDDY SAGILI
MT (TECH)
EMP. NO. : 123140, SMS II (CCD)
Under the esteemed Guidance of
SRI K.V. SIVAPRASAD
AGM (CCD-MECH), SMS II
TRAINING AND DEVELOPMENT CENTRE
VISAKHAPATNAM STEEL PLANT
VISAKHAPATNAM.
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CERTIFICATE
This is to certify that the Project titled “FUNCTIONING OF LADLE
TURRET IN CONTINUOUS CASTING SHOP SMS II” is fulfillment as a part of training
program imparted by RINL/VSP during the year 2013 is a bonafide work carried on by
I acknowledge my profound gratitude & thanks to Sri K.V.SIVAPRASAD,
AGM, CCD (MECHANICAL) for advising me to take up this project work on
“FUCTIONING OF LADLE TURRET IN CONTINUOUS CASTING SHOP SMS II”
under his able guidance & support extended to prepare this project report.
I express my deep sense of gratitude to Sri K.V.SIVAPRASAD, AGM
(CCD -MECHANICAL) for his valuable advice and help extended to me in
preparing this project in spite of his busy office schedule.
BRAHMANANDA REDDY SAGILIMT (T) Emp.No.123140
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INDEX
1.
INTRODUCTION TO CCD, SMS II 5 - 8
2.
LADLE TURRET FUNCTIONS 9 - 11
3.
LADLE TURRET TECHNICAL SPECIFICATIONS 12 – 13
4. SYSTEM EQUIPMENTS 13 - 16
5.
LADLE TURRET DRIVE UNIT 17 - 18
6. LADLE TURRET BEARING FUNCTIONING 19
7.
ARM LIFTING CYLINDER 20 - 21
8. TURRET LOCKING CYLINDER 22
9.
ROTARY JOINT 23 - 24
10.
EMERGENCY ROTATION 24 - 25
11.
LADLE COVER MANIPULATOR 26
12.
LADLE TURRET MAJOR ALARM SIGNALS 26 - 27
13.
DIFFERENCES BETWEEN LADLE TURRET OF SMS 2 & SMS 1 28
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1. INTRODUCTION TO CONTINUOUS CASTING MACHINE, SMS II
The expansion phase of Vizag Steel from present 3.3 MT to 6.3 MT boasts a new SMS
unit namely SMS II which consists of 3 Continuous Casting machines against the 6machines of the present production phase all of which are still yet to be commissioned soon.
The 3 machines are supplied and erected by Danieli Centromet, Italy. A photo of one of the
casting machines namely CCM#1 is shown below in fig: 1.1.The casting machines in the
expansion phase has 6 strands instead of the available 4 strands in SMS I. The machine radius
is 10 m instead of the 12 m radius of all the machines in SMS I. The products formed are
billets and rounds in SMS II cater instead of the blooms formed in SMS I caster. CCM#1
produces billets of size 150X150 and 200X200 and rounds of 220,280 and 350 mm
diameters. Similarly CCM#2 and 3 produces only billets of sizes 150X150 and 200X200.
Fig : 1.1: View of the Casting machine (CCM#1) while casting
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Given below are the main characteristic of the Casting Machine in SMS II:
Machine type 3BLC1006
Number of strands 6
Machine radius 10 m
Unbending radii 19 m
Strand distance 1,5mm
Outfit sections Squares of 150x150 and 200x200 and rounds of
Ф220,Ф280 and Ф350
Ladle capacity 160 t max -150 t nominal
Ladle support Butterfly fork type, 2 independent lifting and lowering
system,
Load capacity 250 t
Ladle cover manipulator Hydraulic type
Ladle shroud manipulator Pneumatic type
Tap to tap time 50 min average
Tundish car Cantilever with electro-mechanical drive
Tundish capacity 35 t
Mould tube Multitaper, Curved 780 mm long for Ф 220- Ф 280- 350mm
Multitaper, Curved 1000 mm long for 150x150 mm
Mould lubrication Oil and Powder for 150x150 mm
Powder for round sections(Closed Casting)
Tundish to mould flow control Slide gates for rounds
Slide gates and FNC for 150x150
mm
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Mould level control Radioactive
Electromagnetic stirrer Mould EMS external + Final EMS
Oscillating unit Hydraulic actuated
Dummy bar rigid
Containment for each strand 2 rows of foot rolls for round sections
3 rows of foot rolls for 150x150 mm and 200x200 mm
Secondary cooling system First zone (foot rollers): water cooling
Zone 2 mist coolingZone 3 mist cooling
Zone 4 mist cooling
Straightening Modular type (5 module per strand) with shaped rolls
Max metallurgical length 24.4 m approx
Withdrawal speed range 0.25-4 m/min
Billet cutting Oxy cutting
Torch Cutting length 6-12 m for billets, 4-6.5mfor rounds
Discharge system Liftable transfer system, turnover cooling bed
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2. LADLE TURRET FUNCTIONS
Turret is designed to support the steel ladles and rotate them from the charging side, where
the overhead crane delivers the ladle, to the casting position, just in above of the tundish.
Turret is fixed with one rigid ladle support arm, designed in a “H” shape to accept ladles
delivered perpendicular to the caster axis. The arm rotates on a central bearing. Compressed
air, inert gas and electrical signals are conveyed to the arm through a rotary joint installed in
the supporting base, this allows a continuous revolving of the turret (360°).Turret is equipped
with a sturdy base frame, rigidity of the structure allows for negligible deflection of the arm.
Main components of the Ladle Turret are:
a) Supporting Structure, made of welded steel sections, anchored via flange and
anchoring bolts to a reinforced concrete base.
b) Central steel body, designed to accommodate the thrust bearing and the arm-driving unit. Bearing, three – row cylindrical roller type.
c) Rotating joint to distribute all utilities.
d) “H” shape ladle arm, made of welded steel sections and dimensioned to handle
ladle of the rated capacity. At each end of the arm, a supporting fork with two
ladle holding saddles is installed. Each saddle is lift able via a hydraulic cylinder.
A total of four cylinders are supplied. Saddles are suitable for installation of
weighing cells.
e) AC motor driving unit equipped with inverter, encoder and brake. The variable
speed motor guarantees a progressive acceleration and deceleration without any
jerking of the arm motion. Motor is coupled with a gearbox and motion is
transmitted through a rack and pinion Gear system.
f) Pneumatic motor for emergency drive, installed on the opposite side of the main
motor and connected through the same shaft of the gearbox, operation is switched
automatically in case of power failure.
g) Dedicated accumulators provide the necessary Instrument air.
h) Weighing system located in the turret arms in order to continuously record the
The drive system is equipped with an electric motor coupled to a pneumatic motorthrough a common shaft. Pneumatic piston motor is used for emergency rotation in low
rotation speed. The electric drive system is hold by using a pneumatic brake. This pneumatic
brake system is operated by instrument air which is supplied at a pressure of 6bar for holding
the brake.
The connection with the bevel gear is guaranteed by means of a “key connection”.
The device requires oil for seal lubrication and seal check for oil leakage. The connection
with the bevel gear is guaranteed by means of a “key connection”. The purpose of the bevel
gear is to drive the motion from one axis to the orthogonal by means of an input shaft from