Press / News & Events »

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

Products
› Home › Products › Toridal Core


Manufacturing Toroidal Core Process

The manufacturing of strips wound cores is a specialized process, which requires a high degree of precision. These cores are manufactured from selected coils of CRGO electrical steel to yield closely controlled electro-magnetic characteristics and dimensional accuracy.

Cores are wound after slitting is done as per the required shape, on the core winding machine. The Winding Machine automatically stops when the pre-decided dimension is reached. The start and finish ends are firmly spot welded. After winding, the cores are stress-relief annealed to restore the magnetic properties. The cores are bonded where necessary, to provide increased firmness. All cores are spray painted and are tested for magnetic properties.

Testing:

Strip wound cores, unlike strip lamination, constitute a complete product and every core must meet the specified performance requirement. Consequently, quality control in the manufacturing of wound cores is vitally important at every stage of process.

Dimensional Tolerances:

The coils of CRGO Steel from which the cores are manufactured are carefully selected on the basis of tests carried in our laboratories to ensure that the correct grade of steel is used. Strict checks are made at every stage from winding to the final stage of spray painting to ensure that the finished product is of a high quality. Moreover, each core is subject to inspection and electrical tests at VSPL to make certain that our customers are provided with the specified performance requirement. Apart from being fully equipped to meet the exacting standards of testing required, VSPL possesses the technical know how, the research facilities and the necessary raw-materials.

Inside Diameter (d) Outside Diameter (d) Height (h)
Over Upto Tol. Over Upto Tol. Over Upto Tol.
30 100 + 1.2 30 100 + 1.5 0 150 + 1.0-0
100 150 + 1.5 100 200 + 2.0 150 200 +1.2-0
150 200 + 2.0 200 400 + 3.0 200 500 +2.0-0
200 400 + 3.0 400 800 + 4.0 500   +3.0-0
400 700 + 4.0 - -        

© Copyright 2009, Vardhman Stampings Pvt. Ltd.

develop by: Gateway Group of Companies | Privacy Policy