Method and apparatus for producing outer panel having character line

A method for producing an outer panel having a character line, which is a bent surface between two surfaces, by using a punch and a blank holder, and a die, having a unitary structure, which opposes the punch and the blank holder, to perform press working on a blank disposed between the punch and the blank holder on one side and the die on the other side by draw forming or stretch forming, wherein

• the punch includes a projecting portion for forming the bent surface and a punch shoulder R portion at a punch top portion,
• wherein the punch includes a first portion, the first portion of the punch including at least one of the projecting portion and the punch shoulder R portion, and the punch includes a second portion which excludes the first portion, and
• wherein the first portion of the punch further includes a particle fixing portion, the particle fixing portion configured to increase a static friction coefficient of the first portion of the punch with respect to the blank,
• wherein the static friction coefficient of the first portion of the punch which includes at least one of the projecting portion and the punch shoulder R portion with respect to the blank is larger than a static friction coefficient of the second portion of the punch which excludes the first portion with respect to the blank,
• wherein the punch includes the particle fixing portion having a holding layer which holds particles, and the particle fixing portion is provided to at least one of the projecting portion and the punch shoulder R portion, and
• wherein an embedding ratio of the particles is 50 to 80%, and the embedding ratio is calculated as (a height of the holding layer/an average particle size of the particles)×100(%).