Core cutting is the part of the manufacturing process when the
core of the transformer is produced. During the process of core
cutting, JST takes thin rolls of sheet steel and cuts them into thin
strips of varying widths, which are then stacked into a
pre-specified geometry. We use a fully-automated, industry-leading
process for cutting, stamping, and stacking. The photos below
illustrate this process:
Different strip widths are loaded onto a turret-type feeding
system that will be used to feed the stamping die. The process is
computer-controlled. By using different strip widths, a round core
geometry can be automatically fabricated during the stacking
operation. In addition, the lengths of each stamping are varied
slightly to produce the step lapped mitered
joints.
Pictured is a stamping station where the different strips are cut
into the desired shape by a precision stamping die. The finished
steel sheets are then moved via a high-speed conveyor system to the
stacking station.
The pictured stacking station accepts the previously cut steel
sheets which are automatically placed to form the appropriate core
geometry.
The end result is a core leg with the appropriate geometry and
design for optimal performance. Step lapped miter sections reduce
energy losses, as well as noise levels for quiet operation of the
transformer.