METHOD FOR MANUFACTURING HEAT EXCHANGER

Abstract: a method for manufacturing a heat exchanger including a plate-shaped fin and a circular heat transfer tube, includes: inserting the circular heat transfer tube through a through hole in the plate-shaped fin; and expanding an outside diameter of the inserted circular heat transfer tube and fixing the plate-shaped fin to the circular heat transfer tube. the expanding of the outside diameter includes pushing a tube expansion plug into the circular heat transfer tube and increasing the outside diameter of the circular heat transfer tube. the tube expansion plug includes a plug body made of a cemented carbide and a diamond film configured to cover a surface of the plug body.

Inventor(s): Yoshiaki Matoba, Motofumi Shimizu, Takayuki Takahashi

CPC Classification: B23P15/26 (METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling ))

Search for rejections for patent application number 20250205836