17-04-2012, 01:17 PM
MODIFICATION OF CROSS TRAVEL SHAFT IN GAS CUTTING MACHINE UNDER CONTINOUS CASTING PROCESS
New Microsoft Office Word Document.docx (Size: 2.12 MB / Downloads: 86)
INTRODUCTION TO VISHAKAPATNAM STEEL PLANT (VSP)
Vishakhapatnam steel plant, the first coastal based steel plant of India is located 16 km south west of city of destiny i.e., Vishakhapatnam. Best owed with modern technologies, VSP has an installed capacity of 3 million tonnes per annum of liquid steel and 2.656 million tonnes of saleable steel. At VSP there is emphasis on total automation ,seamless integration and efficient up gradation, which result in wide range of long and structural products to meet stringent demands of discerning customers with in India and structural products to meet exalting international quality standards’ such as JIS,DIN,and BIS,BS etc.
RAW MATERIAL LINKAGES:
The steel plant is getting its iron ore-lumps and fines from Baliadilla deposits in Madhya pradesh, blast furnace grade lime stone comes from jaggayyapeta in Andhra Pradesh, SMS grade lime stone from jaisaimer & Goton in Rajastan.Blasts furnace and SMS grade Dolomite from Birmitrapur (Orissa) the khammam deposits in Andhra Pradesh 70% of the coking respectively coal requirements are met by imports through Vishakhapatnam harbor while the balance come from Bengal Bihar area. Coal from Anantha deposits of falcher region in Orissa.
WATER SUPPLY:
Requirement of water during the peak of construction were of the order 4.5mgd.This was met from the Megadrigaddaand Raiwada schemes of A.P State Government.
Operational Water requirements 70mgd. Of the steel plant is met from the Yeleru water supply scheme provided by the AP state government. This involved construction of a storage resorvior at Yeleswaram at a 153 kms long limited canal to plant site apart Kanithi Balancing Reservoir.
B-D BAY (TUNDISH PREPERATION BAY):
Liquid steel in steel ladles is brought from the converter shop to CCD by steel transfer cars on rails. Steel (ladles) travel westward. Steel is rinsed with argon at the rinsing station situated in the tundish preparation bay.
D-F BAY (LADLE DISTRIBUTION):
After rinsing, the transfer car is moved further toward the west ladle distribution bay. From here the ladle distributing crane lifts the steel ladle and places it on the life and turn stand of the continuous casting machine which is under operation.
F-H BAY (CASTING BAY):
All the six no’s of four stand bloom casters are located in this bay that’s why it is known as casting bay. The molten steel is casted into solid blooms and required lengths are cut down by gas cutting machines and further will be sent to the H-K bay
Lift and Turn Stand (L & T Stand):
Lift and Turn stand is basically used for the continuity of the casting. It is having lifting-lowering as well as rotating mechanisms. As soon as the metal in casting ladle is exhausted, the spare steel ladle is taken on to the casting position and the casting will be continued. The ladle opening and closing is done through a slide gate mechanism.
TK1 STAND:
It is the first with drawl stand having two top rollers cassette can be lifter/lowered with the help of a hydraulic cylinder. The TK1 stand is mainly used to hold the dummy bar before the start of casting.
DUMMY BAR:
It is a solid chain having 23 links mainly used to hold the metal in the mould and supporting at the start of casting.
DBHM (Dummy Bar Handling Mechanism):
Dummy bar handling mechanism is used to take out the Dummy bar from the machine and parking on the conveyor system and reinsertion during machine preparation.
N1 CASETTE:
After secondary cooling, hot blooms will enter in to N1 cassette where additional cooling zone (Zone-4) is provided. Zone-4 is used at higher casting speeds.N1 Cassette will also give support for the hot blooms.
TK4 STAND:
It is the fourth with drawl stand which will help in the withdrawal of the dummy bar as well as the hot blooms. It is lowered in condition during casting.
ROLLLER TABELS:
The rotating roller tables are mainly used for the transfer of the blooms from the Radial part (TK1, TK2, TK3, and TK4) in to GCM
COST ESTIMATIONS AND SAVINGS:
The replacement cost before modification for a shaft is to be around 12000 Rupees, but after the modification the cost has been reduced to 4000 Rupees. Thus making a saving of 8000 rupees per stand.
CONCLUSION
In this project work an attempt is made to reduce the replacing time of damaged clamps and other parts mounted on the cross travel shaft by modification of cross travel shaft by using chuck nut and bolt. So that can be easily detached from the flange.