US 11,679,530 B2
Manufacturing method of hot forming mold for center pillar trim including cooling unit
Sang Gill Park, Chungju-si (KR)
Assigned to TNP corporation, Chungju-si (KR)
Filed by TNP corporation, Chungju-si (KR)
Filed on Mar. 22, 2021, as Appl. No. 17/208,143.
Claims priority of application No. 10-2020-0035203 (KR), filed on Mar. 23, 2020.
Prior Publication US 2021/0291411 A1, Sep. 23, 2021
Int. Cl. B23K 20/02 (2006.01); B29C 33/38 (2006.01)
CPC B29C 33/3842 (2013.01) [B23K 20/02 (2013.01); B29K 2905/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A manufacturing method of a hot forming mold including a cooling unit, the manufacturing method comprising:
a step of preparing a material by cutting a metal material to have a predetermined thickness to be divided into a plurality of divided materials;
a cooling channel processing step of processing cooling channels on a front surface and a rear surface within a contour line L by mold design information which is input in advance to an NC processor and cooling channel design information, on a surface on which the plurality of divided materials is overlaid;
a first insert step of interposing a first insert material along an outline of the cooling channel;
a second insert step of interposing a second insert material in the contour line L along the contour line L;
a temporary bonding step of heating the first insert material and the second insert material at a temperature at which the first insert material and the second insert material are melted to perform liquid phase diffusion bonding while maintaining a surface pressure of a bonded surface including the divided material and the first insert material and the second insert material after sequentially arranging the plurality of divided materials such that the cooling channels abut;
a step of testing the contour line L of the divided material which is temporarily bonded and the cooling channel by ultrasound scanning;
a solid phase diffusion bonding step of performing solid phase diffusion bonding after sequentially locating the plurality of divided materials such that the cooling channels abut to form an integrated material;
a mold material processing step of processing the integrated material along the contour line L by the mold design information which is input in advance through the NC processor to manufacture a mold material; and
a thermal processing step of heating the mold material at a predetermined temperature,
wherein the divided material which is temporarily bonded in the liquid phase diffusion boding is formed as an integrated material in the solid phase diffusion bonding step.