Method of manufacturing cooling block for hot stamping mold using three-dimensional metal printer

A method of manufacturing a cooling block for a hot stamping mold using a three-dimensional (3D) metal printer, the method comprising:

• a process of first step for forming a plurality of semicircular channels through which a fluid passes on a lower block;
• and
• a process of second step for forming an upper block to form a shape of circular channels using a 3D metal printer respectively on the plurality of semicircular channels formed in the lower block along the plurality of semicircular channels,
• wherein the process of second step comprises forming circular channels by assembling a coupon having semicircular grooves on the semicircular channels formed in the lower block, and forming an upper block by depositing metal powder using a 3D metal printer on perimeter of the coupon,
• wherein the metal powder contains 8-10% of Cr, 1.8-2.5% of Si, 0.25-0.35% of C, 2-3% of Mn, and a remainder of Fe, in weight %.