US 11,654,507 B2
Method for manufacturing liquid-cooling jacket
Hisashi Hori, Shizuoka (JP); Nobushiro Seo, Shizuoka (JP); and Kosuke Yamanaka, Shizuoka (JP)
Assigned to NIPPON LIGHT METAL COMPANY, LTD., Tokyo (JP)
Appl. No. 16/640,646
Filed by NIPPON LIGHT METAL COMPANY, LTD., Tokyo (JP)
PCT Filed May 16, 2018, PCT No. PCT/JP2018/018951
§ 371(c)(1), (2) Date Feb. 20, 2020,
PCT Pub. No. WO2019/123678, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. JP2017-241824 (JP), filed on Dec. 18, 2017.
Prior Publication US 2020/0353557 A1, Nov. 12, 2020
Int. Cl. B23K 20/00 (2006.01); B23K 20/12 (2006.01); F28F 3/12 (2006.01)
CPC B23K 20/122 (2013.01) [B23K 20/1225 (2013.01); B23K 20/1255 (2013.01); F28F 3/12 (2013.01); B23K 20/126 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for manufacturing a liquid-cooling jacket, the liquid-cooling jacket being formed by including: a jacket body having a bottom part and a peripheral wall part standing on a periphery of the bottom part; and a sealing body to seal a recessed part of the jacket body, the jacket body and the sealing body together defining a hollow part in which heat transport fluid flows, the method comprising:
an overlapping process in which the sealing body is placed on an end surface of the peripheral wall part in such a way that the end surface and a back surface of the sealing body are overlapped each other to form a first overlapped part; and
a primary joining process in which primary joining is performed by friction stirring, the primary joining process including inserting a rotary tool provided with a base side pin and a tip side pin in the first overlapped part from a front surface of the sealing body and moving the rotary tool once around the recessed part along the first overlapped part in a state where the base side pin and the tip side pin are in contact with the sealing body,
wherein the rotary tool is provided with a flat surface, which is formed at a tip of the tip side pin and is perpendicular to a rotational axis of the rotary tool, and a projection projecting from the flat surface,
wherein a tapered angle of the base side pin is larger than another tapered angle of the tip side pin,
wherein a step part is formed on an outer peripheral surface of the base side pin, and
wherein in the primary joining process, the first overlapped part is joined in a state where the flat surface is in contact with only the sealing body and a tip of the projection is inserted more deeply than the first overlapped part while the base side pin is in contact with the sealing body.