Core for a wire-wound electronic component, a wire-wound electronic component and a method for manufacturing a core for a wire-wound electronic component

A core for a wire-wound electronic component, the core comprising:

• a winding core portion around which a winding wire is to be wound;
• and
• flanges provided at respective ends of the winding core portion, the flanges projecting from the winding core portion in a direction perpendicular to an axial direction of the winding core portion;
• and
• concaves at respective corners, each corner formed of an adjoining surface of one of the flanges that adjoin to the winding core portion and an end surface of the flanges located in the projecting direction of the flanges;
• wherein inner peripheries of each of the concaves includes a respective connecting surface that connects a contact portion where one of the flanges contact with the winding core portion to one of the end surfaces, and the connecting surfaces are formed of visible surfaces as viewed from a specified direction perpendicular to the axial direction.

A method for manufacturing a core for a wire-wound electronic component, the core comprising a winding core portion, and flanges that are provided at respective ends of the winding core portion and project in directions perpendicular to an axial direction of the winding core portion, the method comprising:

• a first step of filling a material of the core in a female die;
• and
• a second step of pressing the material of the core filled in the female die with a male die;
• wherein in the second step, connecting surfaces that respectively connect a contact portion where one of the flanges contact with the winding core portion to a respective end surface that is located at an end in the projecting direction of the flanges are, respectively, at least part of an inner periphery of a concave at a respective corner, each corner formed of an adjoining surface of one of the flanges that adjoins to the winding core portion and one of the end surfaces;
• and
• wherein all normal vectors of first pressing surfaces of the male die to press the connecting surfaces have components in a direction opposite to a molding-die pull-away direction.

A method for manufacturing a core for a wire-wound electronic component, the core comprising a winding core portion, and flanges that are provided at respective ends of the winding core portion and project in directions perpendicular to an axial direction of the winding core portion, the method comprising:

• a first step of filling a material of the core in a female die;
• and
• a second step of pressing the material of the core filled in the female die with a male die;
• wherein in the second step, connecting surfaces that respectively connect a contact portion where one of the flanges contact with the winding core portion to a respective end surface that is located at an end in the projecting direction of the flanges are, respectively, an inner periphery of a concave at a respective corner, each corner formed of an adjoining surface of one of the flanges that adjoins to the winding core portion and one of the end surfaces;
• and
• wherein first pressing surfaces of the male die to press the connecting surfaces are formed of visible surfaces from a molding-die pull-away direction.