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Year 1989 - Inception of Vardhman Stampings

Year 2000 - Certified with ISO 9001:2000 Certification from DNV, Netherlands, first of its kind then among Indian lamination processors

Year 2002 - approved by PGCIL* in 220 kV class in ring core category

Year 2004 - First in India among lamination processors to install CNC GEORG cut-to-length line having capacity to cut 1000 mm width and 5500 mm in length with Step-Lap Cutting and Auto Stacking facility

Year 2006 - Started processing / promoting to use Fully Step Lap Core

Year 2006 - Approved in 132 kV class by PGCIL* for transformer lamination

Year 2006 - Added one more CNC Cut-to-Length line of 640mm and CNC Slitting Line of 1000 mm width

Year 2007 - Upgraded to 220kV class transformer lamination BY PGCIL*

Year 2007 - Installed UNICORE machine for manufacturing wound core ( single & three phase transformer )

Year 2007 - Installed CNC slitting line of 1000mm and semi automatic Cut-to Length line of 400 mm width

Year 2008 - Approved in 400 kV class by PGCIL*

Year 2008 - Got approval to process transformer lamination up to 1000mm width and 5500mm length by NTPC**

Year 2008 - Successfully audited for Six Sigma - Achieved Three Star rating

Year 2008 - Started production of Radiators for Power and Distribution transformers

Year 2008 - Acquired Government recognized Star Export House.

Year 2008 - Dr. BROCKHAUSE Quality lab comprised with facilities of FRANKLIN Tester, Epstein Tester, Single Sheet and Ring Core Tester.

Year 2009 - Installed CNC-cut to length line of 1000mm width having facility of Step-Lap cutting & auto stacking.

Year 2009 - Certified with OHSAS 18001 : 2007 Certification from DNV, Netherlands, first and only of its kind in indian lamination processors.

Year 2010 -
ELECRAMA - 2010
20th - 24th Jan 2010
Stall No. H6 N38

Year 2010 -
MEE SHOW - 2010
09th - 11th Feb 2010
Dubai, Stall No. 2E38

Quality Practise
› Home › Quality Practise › Laminations Testing

Quality Laminations Testing

In case of Processing Lamination Quality control checks are carried out right through manufacturing process at regular half-hour intervals on every machine and the record is maintained separately.


The laminations are checked for Edge Burrs Width, Camber, Thickness, Stack Thickness, Wave Factor etc. which have to be in accordance with the specific least measurement done by various measuring devices. Standard Tollerance for lamination on various parameters are as follows:

Sr. No. Characteristics Acceptance Limit/Criteria
1 Width (mm) 0 to 100 (+/- 0.15)
100 to 130 (+/- 0.20)
230 to 380 (+/- 0.25)
380 to 580 (+/- 0.40)
580 and above (+/- 0.50)
2 Thickness (mm) + 0.03 mm
3 Edge Burrs (micron)
Thickness - mm
Upto 0.23
0.27 to 0.30
0.35
Burrs Micron
10
15
20
4 Length (mm) Upto 350 (+0.00/-0.30)
350 to 1000 (+0.00/-0.60)
1000 to 2000 (+0.00/-1.00)
2000 and above (+0.00/-2.00)
5 Edge Camber For the material with a width greater than 150mm, edge camber shall not exceed 0.80mm for a length 1.5 Meter
6 Wave Factor
(i.e, Deviation from flatness)
For the material with a width greater than 150mm the deviation from flatness expressed as a percentage shall not exceed 1.5%
7 Angle +/- 5 Minutes
8 Stack Thickness of Individual stack except center step +1-0mm

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