Common rail production process, involving making blind hole in projection before forming branch hole

摘要

The common rail production process involves forming at least one projection integrally with the wall of the main rail, forming a branch hole, forming a connecting head and tightening a clamping nut. A blind hole (3a) is made in the projection (2) before the branch hole (5a) is formed. External pressure is applied to the bottom of the blind hole.