Cutting device for cutting spent wire on spark erosion machine, has spent wire for sporadically brushing against electrical contact by random lateral movements of fluid and acquiring potential of contact

摘要

The device has a transporting device for transporting a spent wire (1) from a machining region towards a recovery receptacle (12), where an electrical contact e.g. metal nipple (14) is connected to one of poles of a voltage/current source (17). The wire is subjected to a dielectric fluid whose flow rate is high to generate a turbulent flow regime. The wire sporadically brushes against the contact by random lateral movements of the fluid and acquires potential of the contact. Another pole of the current/voltage source is connected to a contact placed downstream of the transporting device.