Characteristics Analysis of Cutting Quality on Semi-Flexible Hollow Rectangular Structures of an Insulating Paper for Mass-Production of Slot Liner in EV Motors: the 1st Report, Development of Analysis Method in Cutting Characteristics on B-Shaped Slot Liner

The method of acquisition, analyzation and evaluation of cutting characteristics was developed on a hollow rectangular tube-like structure made of an electrical insulating paper (so called the slot liner in the motors of electric vehicles). The slot liner was cut by a steel disk blade. The cutting force was measured by the dynamometer, to evaluate the specific energy of the cutting: Cp, and the ratio of tangential and normal component of the force: μ, as the indicators of the cutting quality. Parameter estimations were applied using computer simulations of the slot liner in evaluating Cp and μ, with different cutting history (cutting length) of the blades. The difference of the cutting quality was found in variation of μ. Then filling up the hollows using the solid type jig and observations of by high-speed camera were helpful for eliminating the effect of the deformation.