| 摘要 |
The present application relates to a laser-cutting nozzle comprising a nozzle body (1) comprising a first axial recess extending axially through said nozzle body (1), an inlet for supplying assist gas (23) to said first axial recess and a first outlet located at a front surface (1a) of said nozzle body (1), and a moveable element (2) arranged in the first axial recess of the nozzle body (1), wherein said moveable element (2) comprises a skirt-forming front portion (2a) and an axial passage (5) with a second outlet (6) at said skirt-forming front portion (2a), wherein the nozzle body (1) and the moveable element (2) are made of an electrically conductive material. The nozzle body (1) is made of at least one first portion (11) arranged about the moveable element (2) and one second portion (12) that positions itself, according to the direction of flow of the assist gas in the first axial recess, above the said first portion (11), wherein the nozzle body (1) further comprises first attachment means (7, 8) suitable and designed for attaching the second portion (12) onto the first portion (11), and a separator sleeve (14) is arranged between the first portion (11) and the moveable element (2), wherein said separator sleeve (14) is made of an electrically insulating material having a relative permittivity of less than 8. The present application also relates to a focusing head and a laser-cutting apparatus comprising such a nozzle. |
