| 摘要 |
PURPOSE:To make such nonadjustable, stable machining as being subject to no thermal deformation as well as enjoying high performance in terms of an erosion rate and acuracy of a finishing surface attainable, by using a ceramic material comprising zirconia or silicon nitride as the main component, for nozzles of a spouting device in material. CONSTITUTION:Both upper and lower nozzles 36, 37 using a ceramic as material comprising zirconia as the main component are locked to upper and lower support blocks with screws, while these nozzles are little in thermal deformation, and since they are excellent in machinability prior to sintering, besides insulating properties, there is no deformation due to heat of discharge energy out of machining part and, what is more, there is nothing of any drop or variation in a dielectric fluid supply or feed pressure, thus they enjoy high performance in terms of an erosion rate accuracy of a finishing surface. In addition, since unevenness of completion size in the parts manufacturing stage is easy to make it smaller, adjustment operations for the lower support block 24 or troublesome work in time of nozzle changing are no longer required, thus operatability is well improved. And, since these nozzles is strong against impact resistant load, if a core is dropped off during machining, there is no breakdown at all, so stable, continuous machining comes possible to be done without stopping the machine. |
