Laser Dicing of PCD/PcBN discs into small blanks
Lasers can be used to ‘dice’ large discs of PCD and some types of PcBN into smaller pieces
or to pre-shape edges in place of rough grinding.
The LD2 laser is manufactured by Coborn Engineering in the UK and is specifically designed to cut mother discs of PCD into smaller pieces. It can also be used to cut plates of cemented tungsten carbide and some grades of PcBN. Typically, 1.6mm PCD can be cut at a speed of approximately 80-100m/min. This is approx 30 times faster than wire cutting.
The machine accepts "dxf" drawing files directly. If required the machine can be fitted with a Fanuc controller instead of the standard controller.
The laser easily evaporates the PCD layer but the carbide substrate is more difficult to cut. For this reason the laser is gas assisted using nitrogen. This gas jet ensures the molten cobalt in the carbide substrate does solidify in the cut zone. Without the gas the pieces would simply weld back together.