METHOD OF MANUFACTURING FIXED CORE

PROBLEM TO BE SOLVED: To provide a method of manufacturing a fixed core, which does not need to change the pitch of comb-toothed slots by replacement, etc. of a die so as to make cores or inclined cores which are different in the number of slots, with the same diameter of winding, or cores or inclined cores which are different in the diameter of winding, with the same number of slots.

SOLUTION: In a band-shaped steel plate, comb-toothed slots are made, and the band-shaped steel plate is processed into the slots of pitches required for specified diameter of winding, by catching it from the direction of board thickness by means of a pair of rolls and rolling it for reduction of board thickness and elongating the pitch of the slots on comb teeth in its rolling direction, and the specified diameter of winding is decided by pressing a jig against the lateral flank of the band-shaped steel plate and changing the amount of pressing.

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