Abstract: A high-frequency heating method for a hot stamping process includes: a first heating step of high-frequency heating a steel sheet, which has an aluminum (Al) coating layer formed on an iron (Fe)-based base material, to a first target temperature at a first heating rate; a second heating step of melting the coating layer by high-frequency heating the steel sheet, which has passed through the first heating step, to a second target temperature at a second heating rate, wherein the second heating rate is lower than the first heating rate; and a third heating step of high-frequency heating the steel sheet, which has passed through the second heating step, to a third target temperature at a third heating rate, wherein the third heating rate is lower than the second heating rate. A compound is formed by a reaction between a material of the coating layer and a material of the base material in the second heating step.

Abstract: A cooling apparatus for a hot stamping die is configured such that a refrigerant in a two-phase coexisting state of a liquid phase and a gas phase is supplied to a cooling channel formed in the hot stamping die to cool the hot stamping die using latent heat of the refrigerant. The refrigerant maintains a constant temperature in the cooling channel of the hot stamping die, which ensures uniform cooling of the hot stamping die.

Abstract: A jig for strength test of a side door of a motor vehicle for supporting a side outer component product includes a jig frame, a first roof rail jig unit installed in an upper rear end of the jig frame and configured to support a roof rail of an upper end portion of a center pillar of a product, a second roof rail jig unit installed in an upper central portion of the jig frame and configured to support a roof rail of the center pillar of the product, a cowl crossbar jig unit installed in a front upper end of the jig frame and configured to support a front roof and a hinge portion of the product, and a plurality of side seal jig units installed in a lower end portion of the jig frame and configured to support a lower end portion of the product.

Abstract: A high-frequency heating method for a hot stamping process includes: a first heating step of high-frequency heating a steel sheet, which has an aluminum (Al) coating layer formed on an iron (Fe)-based base material, to a first target temperature at a first heating rate; a second heating step of melting the coating layer by high-frequency heating the steel sheet, which has passed through the first heating step, to a second target temperature at a second heating rate, wherein the second heating rate is lower than the first heating rate; and a third heating step of high-frequency heating the steel sheet, which has passed through the second heating step, to a third target temperature at a third heating rate, wherein the third heating rate is lower than the second heating rate. A compound is formed by a reaction between a material of the coating layer and a material of the base material in the second heating step.

Abstract: A jig for strength test of a side door of a motor vehicle for supporting a side outer component product includes a jig frame, a first roof rail jig unit installed in an upper rear end of the jig frame and configured to support a roof rail of an upper end portion of a center pillar of a product, a second roof rail jig unit installed in an upper central portion of the jig frame and configured to support a roof rail of the center pillar of the product, a cowl crossbar jig unit installed in a front upper end of the jig frame and configured to support a front roof and a hinge portion of the product, and a plurality of side seal jig units installed in a lower end portion of the jig frame and configured to support a lower end portion of the product.

Abstract: A cooling apparatus for a hot stamping die is configured such that a refrigerant in a two-phase coexisting state of a liquid phase and a gas phase is supplied to a cooling channel formed in the hot stamping die to cool the hot stamping die using latent heat of the refrigerant. The refrigerant maintains a constant temperature in the cooling channel of the hot stamping die, which ensures uniform cooling of the hot stamping die.

Abstract: Provided is a method for manufacturing vehicle body parts, including: rolling a blank such that the blank has two or more regions with different thicknesses; trimming the rolled blank; and performing hot press forming on the trimmed blank, and cooling the trimmed blank. The blank to be rolled has an absorption hole, and a flange protrudes from an edge region of the blank corresponding to a position of the absorption hole. The blank is rolled in two or more different directions.