カシメ、加締め、スエージング

Staking（かしめ継ぎ、加締め）, Wikipedia
"Staking is the process of connecting two components by creating an interference fit between the two pieces. One workpiece has a hole in it while the other has a boss that fits within the hole. The boss is very slightly undersized so that it forms a slip fit. A staking punch is then used to expand the boss radially and to compress the boss axially so as to form an interference fit between the workpieces. This forms a permanent joint.^[1]"

Swaging（スエージング、据込み加工）, Wikipedia
"Swaging ... is a forging process in which the dimensions of an item are altered using dies into which the item is forced.^[1] Swaging is usually a cold working process; however, it is sometimes done as a hot working process.^[2]

The term swage can apply to the process of swaging (verb), or to a die or tool used for swaging (noun)."

プレス金型講座（ミスミ）

超音波機器加工事例（日本アビオニクス株式会社）