MANUFACTURING
PROCESS PLAN FOR IMPROVED SEJ
(As per Drawing Nos. RDSO/T-6902 & RDSO/T-6914)
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SL. NO. |
OPERATIONS |
PROCESS DESCRIPTION |
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1) |
STACKING OF RAILS |
Rails received from
the Purchaser / Railway Depot / SAIL are stacked properly in layers with
steel spacers between the layers adopting the procedure specified by RDSO. |
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1.1 |
VISUAL
CHECK AND ULTRASONIC TEST |
Ø Rails
are taken out from the stack with EOT cranes using two point slinging and are
spread on steel supports. Spread rails are cleaned thoroughly to remove rust,
scales and checked visually for surface / rolling defects. Ø After
visual checking, the rails are subjected to Ultrasonic Test using RDSO
approved model of Ultrasonic Rail Tester MSL-32 (R). Ø Before
testing the rails, the USFD instrument is calibrated with the help of RDSO
specified Standard Test Piece. Ø Hundred
per cent rails are subjected to Ultrasonic testing. |
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1.2 |
MARKING |
Ø Ultrasonically
passed rails are marked with white paint on top of rails. Then the rails are marked for cutting to
required lengths as per Drg. On marking for cutting, a job No. is marked on
the top of rail. Ø The cast
numbers of the ultrasonically passed rails are recorded in a Register and the
job number recorded against each. |
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1.3 |
CUTTING
OF RAILS |
Rails marked for
cutting are paced on cutting machine on level platform fixed with rollers and
cut to the marked length with Hack-Saw / Band Saw machines. The squareness of the cut end of the rails
checked with try-square. |
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1.4 |
HEAT
TREATMENT |
Straightened rails
are taken for Heat Treatment / Pearlitised by Induction Heating Process. |
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1.5 |
ULTRASONIC
TESTING OF HEAD TREATED RAILS |
Heat treated rails
are further subjected to Ultrasonic and MPT Testing before machining. Heat
treated rail also tested for hardness, micro/macro testing & straightening,
and mechanical properties. |
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2) |
STOCK
RAILS |
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2.1 |
MARKING
FOR MACHINING |
Stock rails after
heat treatment and straightening are marked for head and foot machining. |
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2.2 |
DRILLING |
After straightening
the rail are marked for drilling and drilled with radial drill machines. |
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2.3 |
MACHINING |
a) NOTCHING – Straightened rails are marked
for notching and machining of Head and Foot. Notching of head and foot
are done by shaper machines as per marking and checked with checking gauges. |
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b) HEAD & FOOT MACHINING – After notching
the rails are taken for head and foot machining on planer machines and
machined straight as per marking and are checked with checking gauge. |
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c) RADIUSING AT END – After head and foot
machining the rails are taken for and
radius by shaper machines and checked with checking gauge. |
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2.4 |
STRAIGHTENING
OF STOCK RAILS |
Stock
rails after assembly are taken for straightening once again before final
assembly with tongue rails. |
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3) |
TONGUE RAILS/GAP
AVOIDING RAIL/CHECK RAIL |
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3.1 |
MARKING
FOR MACHINING |
Tongue rails after
heat treatment and straightening are marked for head and foot machining. |
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3.2 |
MACHINING |
a) NOTCHING – Straightened rails are marked
for notching and machining of Head and Foot.
Notching of head and foot are done by shaper machines as per marking
and checked with checking gauges. |
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b) HEAD & FOOT MACHINING – After notching
the rails are taken for head and foot machining on planer machines and
machined straight as per marking
and are checked with checking gauge. |
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c) RADIUSING AT END – After head and foot machining
the rails are taken for end radiusing by shaper machines and checked with
checking gauge. |
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4) |
Finishing and
Removal of sharp edges |
Finishing as
per gauge and removal of sharp edges
by filing/ grinding to suitable radius not exceeding 2R |
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5) |
ASSEMBLY OF STOCK RAIL WITH GAP AVOIDING RAIL |
After complete head
and foot machining of the stock rails and Gap avoiding rail and filing /
grinding of sharp edges formed to radius not greater than 2R are assembled
together to form the fabricated stock rails using HTS bolts. |
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6) |
ASSEMBLY OF SEJ |
Final assembly is done
in the assembly bay inside the shop floor.
The assembly of finished tongue and stock rails is done by skilled
workmen using C.I. Chairs and M.S.
Brackets with T-Head bolts and nuts.
While assembly, hydraulic jim crows are used by aligning the gauge face
and matching of tongue and stock rails. |
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7) |
INTERNAL INSPECTION |
The final assembly
of SEJ and their components are checked by in-house inspection team. The
inspection is carried out using steel tape, scale, Vernier Caliper, approved
gauges and templates. The observations are recorded in Inspection Register.
M&C inspection, Mechanical & chemical testing of components are also
done. |
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8) |
EXTERNAL INSPECTION |
The products
internally inspected and accepted are offered for inspection by the external
agencies (RDSO / RITES / Purchaser or their authorized agents). |
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9) |
PAINTING |
After inspection
and acceptance by the external agency, the products are painted following the
procedure as laid in IRS/T-10/2000. |
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10) |
MARKING |
Painted materials
are left for drying and then they are marked as per IRS/T-10. |
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11) |
PACKING AND
DESPATCH |
Inspected,
accepted, painted and marked materials are packed in double gunny bags,
bundled or lashed with stout wire and dispatched to the Consignee. |
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