Method for producing press-formed product, press apparatus, press-formed product, structural component for automobile, and automobile

A press apparatus, comprising:

• a first die including a first forming surface;
• a second die that includes a second forming surface facing the first forming surface and having a shape corresponding to the first forming surface, and that is capable of coming close to the first die relatively;
• a piercing punch that is housed inside the first die and that is configured to protrude from the first forming surface;
• and
• a burring punch that is housed inside the first die and is arranged coaxially with the piercing punch on an opposite side to the first forming surface with respect to the piercing punch, and that is configured to protrude from the first forming surface following the piercing punch, the burring punch having a larger diameter than the piercing punch,
• wherein the second die includes a receiving portion that is a space provided inside the second die and that is arranged at a position corresponding to the piercing punch and the burring punch and opens to the second forming surface.

A press-formed product that is made of steel, comprising:

• a formed product body;
• and
• a burring portion that includes a hole portion that penetrates the formed product body in a sheet thickness direction, and a cylindrical portion that rises in the sheet thickness direction from a peripheral edge of the hole portion,
• wherein, in a microstructure of the formed product body and the burring portion, an area fraction of martensite is 85% or more.

A method for producing a press-formed product, comprising:

• a preparation process of preparing a starting material comprising a metal sheet;
• a forming process of placing the starting material between a first die including a first forming surface, and a second die including a second forming surface having a shape corresponding to the first forming surface, and bringing the first die close to the second die relatively to clamp and form the starting material by means of the first forming surface and the second forming surface;
• and
• a burring process of, while maintaining a clamped state of the starting material by the first forming surface and the second forming surface, forming a burring portion in the starting material by causing a piercing punch housed in the first die to protrude from the first forming surface to form a through-hole in the starting material by means of the piercing punch and thereafter causing a burring punch that is arranged coaxially with the piercing punch inside the first die and that has a larger diameter than the piercing punch to protrude from the first forming surface to raise an outer circumferential portion of the through-hole by means of the burring punch.