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MLSM PRODUCTS
ISMC 100X50, ISMC 125X65, ISMC 100X50, ISMC 125X65,
AL _75X75, AL_80X80, AL 90X90, AL _100X100,
AL_110X110, AL_120X120, AL_130X130, AL_150X150, AL_180X180, AL_200X200
AL _75X75, AL_80X80, AL 90X90, AL _100X100,
AL_110X110, AL_120X120, AL_130X130, AL_150X150, AL_180X180, AL_200X200
AnglesAngles
- -15 February 2019MLSM
NPB 180X90, NPB 200X100, UB 203X133, UB254X146, UB305X165, UC 152X152,
UC203X203,
NPB 180X90, NPB 200X100, UB 203X133, UB254X146, UB305X165, UC 152X152,
UC203X203,
Parallel Flange Beams and columns
Parallel Flange Beams and columns
ISMC 100X50, ISMC 125X65, ISMC 150X75, ISMC
175X175, ISMC 200X175, ISMC 250X82. ISMC300X90
ISMC 100X50, ISMC 125X65, ISMC 150X75, ISMC
175X175, ISMC 200X175, ISMC 250X82. ISMC300X90
ChannelsChannels
RKAV1
ROUGHING MILL FINISHING MILLCOOLING BED
REHEATINGFURNACE
Divide Shear
CROP SHEAR
BILLET YARD
Profile gauge
DESCALER
Secondary DESCALER
PROCESS FLOW CHART
3
COLD SAW 1COLD SAW 2
STACKER
COLLECTING BAY
STRAIGHTENER
LAYER FORMING
TYING MACHINES
MAGNETIC EOT CRANE
15 February 2019MLSM RKAV1
MLSM PRODUCT APPLICATION
ØPOWER
TRANSMISSION
TOWERS
● All Angles, 75X75 to
15 February 2019MLSM RKA
200X200 mm size approved by
Power Grid Corporation of
India)
● PGCIL inspection waiver
certificate (Self certification)
for all Angle product of MLSM.
V1
The Process•After rolling, Hot bar is shifted on
cooling bed.
•Cooling of the bar is done by natural air and water spray.
•In the normal cooling process there is tendency of shrinkage of metal and
9
tendency of shrinkage of metal and bar having tendency of up sweep & bend.
•After cooling, bar passes through straightening m/c to straighten the bar.
•Straightening m/c straighten the bar and prepares it for cutting in customer length.
Convexity Problem analysis
As per Danieli we were using two rings top rolls in ISMC300X90. we were facing convexity 1.5mm problem in this section.
We have observed that concavity is less in 15U universal roll. Resulting the issue of convexity in cold sample after straightening.
Analysis
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DanieliDesign
Roll
Implementation
Solution For Convexity
§ We have totally changed the danieli design of Top table. And used three rings of Beam section to get uniformly load in total finished depth of channel.
§ Modification in 15U mill stand. Concavity increased from 0.5mm
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Concavity increased from 0.5mm to 1.5mm in 15U roll.
Solution For Out of square.
§ Bottom width increase 3 mm (From 288 to 291mm) by adding shim to avoid out of square problem.
Comparison of Before & After
Before Modification
Danieli Design
After Modification
In- House Design
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Benefits:
• All the Re-straightening expenses
avoided from the second campaign.
• Morale of employees boosted up after
successful In-house modification in
Straitening rings of
18
Straitening rings of
ISMC300X90X36.3kgs/mtr.
• Internal and external customer
satisfaction.
• Improvement in Safety aspect at Finishing
area.
Defect List
• Narrow Flange• Out of square• Over Wt.• Under Wt.• Sloppy Apex
- -15 February 2019
• Sloppy Apex• Wide Flange• Scratch mark• Lap• Fin• Bend & Twist