Injection device and electrode wire electric discharge machine for high- speed precision machining

摘要

The injection device for machining liquid comprises a nozzle (9) sliding in a mobile element (7) which itself slides inside a housing (1) fixed to a machining head, these three elements forming an injection chamber (2) with the base of this head. The nozzle (9) and the mobile element (7) are profiled in such a way as to delimit a pressure chamber (30) along one of the sides (31) of a shoulder (11) built on the periphery of the nozzle (9), as well as a second chamber (20) along the opposite side of this shoulder (11). The nozzle (9) has openings (28) linking this pressure chamber (30) to the injection chamber (2). The mobile element (7) has openings (10) linking the chamber (20) with the atmospheric pressure. The shoulder (11) is sized so that the pressure created in the chamber (30) at least partly counterbalances the pressure created in the injection chamber (2) and acts on the nozzle (9) in the opposite direction.