Quality Assurance
Navkar Transcore Magnetic Material Testing Laboratory
- Single Sheet Tester
- Ring Core Tester
- Power Analyser
- Epstein Tester
- Franklin Insulation Resistance Testing Machine
- Yokogawa Testing Instruments
We at ‘Navkar Transcore’ are
one of the leading manufacturers and suppliers
of Fabricated Cold Rolled Grain Oriented Silicon Steel Products
Quality Raw Material
Testing Process
All the incoming raw materials are examined at Navkar Transcore Laboratory with following testing facility
- Single Sheet Tester
- Ring Core Tester
- Epstein Tester
- Franklin Insulation Resistance Testing Machine
- Bend Test
- Stacking Factor Test
Check Parameters
The acceptance norms for above tests are mentioned below:
| No. | Tests | Acceptance Norms |
|---|---|---|
| 1 | Bend Test or Brittleness Test | Min. 5 Bends 0-180° Bending Of Sample (Size :- 305 X 30 mm) |
| 2 | Stacking factor test | As Per Diff. Grade 0.23 - 95.5% 0.27 - 96.0% 0.30 - 96.0% 0.35 - 96.5% |
| 3 | Surface Insulation Resistivity Test as per Franklien Test Method. | > Min. 100hm/Cm2. |
| 4 | Core Loss Test (By Epstein Square Test Method) |
W/kg. at specific flux density for Diff. Grades from Coils (At start and end of the coil) |
| 5 | A/c Permeability Test | Min. 1.75T at 800AT/m & 50Hz for conventional G.O. Steel and Min. 1.85T at 800AT/m & 50Hz for high permeability G.O. steel |
Woundcore Quality
Testing Process
Rigid quality control of all material is maintained from the time of their arrival in the stores to their issuance for production in our test laboratories, which are equipped with sophisticated testing instruments for electrical and mechanical properties.
"The sole guarantee of endurance and reliability is Quality". At Navkar Transcore this philosophy is implemented through stringent quality control measures that ensure strict compliance with specified standards. Quality control checks are carried out very strictly to ensure that only quality products reach our customers. Quality is monitored right from inspection of correct raw material to final stages when the products are thoroughly tested for
Check Parameters
Information about quality control testing parameters for Wound cores
| No. | Description | Measuring Device | Accuracy |
|---|---|---|---|
| 1 | Watt Loss of Built Core | Power Analyser | 0.5 Watt |
| 2 | Dimensional Measurement of Stack and Weight |
1. Vernier Calipers 2. Electronics Scale |
0.1 mm 100 gms |
Quality Lamination
Testing Process
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.
Check Parameters
Standard Tollerance for lamination on various parameters are as follows:
| 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 |
Standard Tolerance
| No. | Characteristics | Acceptance Limit/Criteria |
|---|---|---|
| 1 | Width (mm) | O 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 .23 27 to .30 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 150 mm, edge camber shall not exceed 0.8 mm for a length 1.5 meter |
| 6 | Wave Factor | For a material of width greater than 150 mm the deviation from flatness expressed as (i.e Deviation From flatness) a percentage shall not exceed 1.5%. |
| 7 | Angle | +/-5 Minutes |
| 8 | Stack Thickness of individual Stack except centre step Unclamped | +1 -0 mm |
WE ARE TRUE TO OURSELVES,
AND COMMIT TO ALWAYS PERFORM AT OUR BEST.