| 摘要 |
PURPOSE:To prevent burr from being made at the intersection of a valve seat surface and an injection hole surface and improve the efficiency of manufacturing of a nozzle and its quality, by providing a coupling surface at the intersection of the roughly processed valve seat surface and the roughly processed injection hole surface and thereafter finally processing them. CONSTITUTION:A conical valve seat surface 13, on which a valve is seated, and an injection hole surface 14, are provided in a nozzle body 11 by rough processing. A conical coupling surface 15 is provided at the intersection of the valve seat surface 13 and an injection hole surface 14 to smoothly couple them to each other. After the valve seat surface 13 is finally processed by grinding or lapping, the injection hole surface 14 is finally processed by grinding. After that, the injection hole surface 14 is lapped to obtain a predetermined flow rate when the valve is fitted in the nozzle body 11. Since the coupling surface 15 is provided, no burr is made when the injection hole surface 14 is lapped to obtain the predetermined flow rate. This results in improving the efficiency of manufacturing of a nozzle, reducing the pressure loss, and stabilizing the form of atomization. |
