Electromagnet iron core, electromagnet and iron core machining method

The invention relates to the technical field of electromagnets, and discloses an electromagnet iron core, an electromagnet and an iron core machining method.The electromagnet iron core is provided with a first direction and comprises an iron core body, balls and a limiting block, the iron core body is provided with a peripheral wall face and a first end face which are connected with each other, and the first end face is provided with a containing hole; the axis of the accommodating hole is parallel to the first direction, and the accommodating hole is provided with an opening extending to the peripheral wall surface; the balls are arranged in the containing holes and can move in the first direction, and at least part of the balls are exposed out of the opening. The limiting block is arranged on the iron core body, at least part of projection of the limiting block coincides with projection of the containing hole in the first direction, and the limiting block is used for limiting the balls in the containing hol