Abstract: A method punches and holds an iron core piece from a magnetic steel plate into a die using a punch, rotates the die at a predetermined angle, repeats the holding for an iron core piece based on the punching and the rotating of the die to form laminated iron cores in which iron core pieces are laminated, and separates the laminated iron core with a predetermined height being lower and coming off the die to be supported on a receiving stage from the laminated iron core being upper according to descending of the receiving stage, wherein the rotating of the die is stopped at the time of the descending of the receiving stage in a state that the laminated iron core being lower is come off the die.

Abstract: A base plate of a stainless-steel body material formed by pressing is polished and cleared of burrs by means of an abrasive material that consists mainly of Fe2O3 in a polishing process. The polished base plate is heated to a heat treatment temperature for solid solution in a reducing atmosphere in a heat treatment process. In this heat treatment process, an oxide in the constituents of minute fragments of the abrasive material in the surface of the body material of the base plate is reduced to leave iron, which is dispersed into the body material.

Abstract: A base plate of a stainless-steel body material formed by pressing is polished and cleared of burrs by means of an abrasive material that consists mainly of Fe2O3 in a polishing process. The polished base plate is heated to a heat treatment temperature for solid solution in a reducing atmosphere in a heat treatment process. In this heat treatment process, an oxide in the constituents of minute fragments of the abrasive material in the surface of the body material of the base plate is reduced to leave iron, which is dispersed into the body material.