	US 12,186,792 B2
	Hot-stamping molding method enabling molding of components having various levels of strength by part through cooling control by position
Sang Kon Lee, Daegu (KR); In Kyu Lee, Changwon-si (KR); Sung Yun Lee, Daegu (KR); Myeong Sik Jeong, Daegu (KR); Sun Kwang Hwang, Daegu (KR); and Dong Yong Park, Daegu (KR)
Assigned to KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, Cheonan-si (KR)
Appl. No. 17/787,580
Filed by KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, Cheonan-si (KR)
PCT Filed May 12, 2020, PCT No. PCT/KR2020/006212 § 371(c)(1), (2) Date Jun. 20, 2022, PCT Pub. No. WO2021/125461, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0170673 (KR), filed on Dec. 19, 2019.
Prior Publication US 2022/0410240 A1, Dec. 29, 2022
Int. Cl. B21D 22/02 (2006.01); B21D 37/16 (2006.01); C21D 1/667 (2006.01)

CPC B21D 22/022 (2013.01) [B21D 37/16 (2013.01); C21D 1/667 (2013.01)]

2 Claims

1. A hot stamping forming method for forming components having various strengths according to parts of the components through cooling control, the hot stamping forming method using a multi-point forming mold device to which a plurality of forming modules are coupled, wherein each of the plurality of forming modules comprises a punch body that is vertically driven, an air jet nozzle provided in the punch body, and a punch head detachably coupled to the punch body, the hot stamping forming method comprising:

setting a first strength for a central part of a target component and a second strength for an edge part of the target component, wherein the second strength is higher than the first strength, and the target component is supplied into the multi-point forming mold device;

adjusting an arrangement of the plurality of forming modules according to the set required strength; and

performing cooling control for each part by controlling an amount of cooling air or mist sprayed to the target component by the air jet nozzle in order to achieve a required cooling speed for each strength part of the supplied target component,

wherein the adjusting of the arrangement of the plurality of forming modules includes forming a curved surface on the target component by adjusting vertical heights of the plurality of punch heads by operating pressing forming modules located over and under the target component,

wherein each of the plurality of air jet nozzles comprises a flow rate control valve therein,

wherein the flow rate control valves are grouped into unit valve modules, the unit valve modules are interoperated with a main flow control valve, in the unit valve modules portions of providing flow input/output are alternately arranged vertically, and

wherein the cooling control is performed by setting a flow rate of a refrigerant through the flow rate control valve located on the edge part to be higher than a flow rate of a refrigerant through the flow rate control valve located on the central part.