중첩 핫 스탬프 성형체의 제조 방법 및 중첩 핫 스탬프 성형체

• Main Authors: NOMURA NARUHIKO, FUDA MASAHIRO, MAKI JUN, FUJITA SOSHI, YOSHIKAWA NOBUO, IRIKAWA HIDEAKI, SUZUKI YUKI
• Format: Patent
• Language: Korean
• Published: 14.09.2022
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

[과제] 겹침부와 1매부의 승온 속도의 차에 기인한 강판의 휨에 관한 문제를 해결하는 것. [해결수단] 본 제조 방법은, 중첩 블랭크를 가열하는 공정과, 가열 후의 중첩 블랭크를 반송하는 공정과, 가열 후의 중첩 블랭크를 금형으로 프레스 가공하는 공정을 포함하고, 가열하는 공정에서는, 제1, 제2 강판의 판 두께를 t1, t2로 하고, 중첩된 부분의 합계 판 두께(t1+t2)의 부분 및 중첩되지 않은 부분의 판 온도 20 내지 800℃ 사이의 평균 가열 속도를 V, v1이라 할 때, 합계 판 두께(t1+t2)가 2.5 내지 5.0㎜이고, 중첩된 부분의 최대 길이 L이 100 내지 1100㎜이고, 제1 강판의 면적 S1, 제2 강판 중 제1 강판과 중첩되어 있는 부분의 면적 S2, 평균 가열 속도 V, v1이, 식 (1) 내지 (3)을 충족하고, 가열 시간 및 가열 온도로 정의되는 좌표 평면에 있어서 특정한 범위 내의 가열 온도 및 가열 시간으로 가열한다. To solve a problem about warpage of a steel sheet due to a difference in temperature raising rate between an overlapped part and a one-sheet part. This manufacturing method includes: a step of heating an overlapped blank; a step of transferring the heated overlapped blank; and a step of performing presswork on the heated overlapped blank by using a die, in which in the heating step, when sheet thicknesses of the first and second steel sheets are set to t1 and t2, respectively, and an average heating rate at a sheet temperature from 20 to 800°C of a portion with a total sheet thickness (tl + t2) of an overlapped portion, and that of a non-overlapped portion are set to V and vl, respectively, the total sheet thickness (tl + t2) is 2.5 to 5.0 mm, a maximum length L of the overlapped portion is 100 to 1100 mm, an area S1 of the first steel sheet, an area S2 of a portion, of the second steel sheet, which is overlapped with the first steel sheet, and the average heating rates V and v1 satisfy Expressions (1) to (3), and the heating is performed at a heating temperature and for a heating time within a specific range on a plane of coordinates defined by the heating time and the heating temperature.