TOP GUIDE ASSEMBLY IN WIRECUT ELECTRIC DISCHARGE MACHINING DEVICE.

摘要

A top guide assembly (7) in a wirecut electric discharge machining device provided thereon with an automatic wiring mechanism and having a construction by which a wire (1) can be held without direct mechanical contact. A hold jet nozzle (37) is connected to the top portion of a main body (23) and a top guide (24) is connected to the bottom portion of the main body (23). The main body (23) is provided with an electrode roller (12) for supplying power to the wire (1) and an electrode pinch roller (13) attachable to and releasable from the electrode roller (12). The hold jet nozzle (37) has a through-hole (40), the center axis of which coincides with a wire route a extending vertically and set in the top guide assembly (7), and a high pressure working fluid supplying path (41) communicating with the through-hole (40). The top guide (24) is provided therein with a dice guide (35) and a top nozzle (34). The guide axis of the dice guide and the center axis of the top nozzle coincide with the wire route a. During operation of the wirecut electric discharge machining device, high pressure working fluid is supplied to the aforesaid supplying path (41) and a powerful water column is formed in the top guide assembly (7), whereby the wire (1) is guided by the water column through the top guide assembly (7) without contacting inner members.