Deburring and coating system
Within the production of sheets a cutting burr is created, which can cause contacts between the sheets when pressing the laminated core. This facilitates the generation of eddy currents. In the worst case, this can result in the early breakdown of a machine. Deburring and recoating of sheets minimises this hazard potential, thus prolonging machine life and efficiency.
The burr is removed along the cutting edges and a new insulating layer is applied. This reduces the generation of eddy currents over various sheets and the associated thermal loss of the laminated core.
The production process is carried out with the following technological systems:
1. Deburring machine
The burr caused during production is thoroughly removed by grinding on one side of the sheets along the cutting edges.
2. Roller coater
Top and bottom side of the electrical sheet are coated with an insulating varnish with a layer thickness of approx. 4 μm to 7 μm using a rolling process.
3. Drying and cooling section
The varnish dries at a temperature not exceeding 290 °C and hardens permanently. This step is followed by cooling the sheets to room temperature.
- Workpiece length: 350 mm to 1,250 mm
- Workpiece width: 350 mm to 1,250 mm
- Workpiece thickness: 0.35 mm to 1.0 mm
- Coating material is a standard, water-based insulating varnish, suitable for roller coating
- Viscosity range: 60 to 150 DIN 4s
- Usual application thickness: 4 μm to 7 μm dry / side
- Thickness in case of double application: 8 μm to 12 μm dry / side
- Tolerance application thickness: 1 μm
- Varnish drying temperature: max. 290 °C