PROCESSING METHOD OF FUEL INJECTION DEVICE

PROBLEM TO BE SOLVED: To provide a processing method of a fuel injection device capable of suppressing manufacturing costs while suppressing dispersion of diameters of fuel injection holes in polishing the fuel injection holes of an offset nozzle-type fuel injection device.SOLUTION: A processing method of a fuel injection device 1 has a polishing process for making a polishing fluid prepared by mixing abrasive grain and a liquid, flow into fuel injection holes 20, and polishing inner faces of the fuel injection holes 20. In a case when one of the fuel injection holes 20 is defined as a first fuel injection hole 21, and one of the fuel injection holes 20 having an inclination to a shaft center A of a main body portion 10 larger than that of the first fuel injection hole 21 is defined as a second fuel injection hole 22, a flow rate per a unit time of the polishing fluid flowing to the first fuel injection hole 21 is more than a flow rate per a unit time of the polishing fluid flowing to the second fuel injection hole 22 in the polishing process.SELECTED DRAWING: Figure 3 【課題】オフセットノズル型の燃料噴射装置の各燃料噴射孔を研磨する際、各燃料噴射孔の直径のバラツキを抑制しつつ、製造コストを抑制することも可能な燃料噴射装置の加工方法を提供する。【解決手段】燃料噴射装置１の加工方法は、砥粒と液体とを混合した研磨流体を燃料噴射孔２０のそれぞれに流し、燃料噴射孔２０のそれぞれの内面を研磨する研磨工程を有する。燃料噴射孔２０の１つを第１燃料噴射孔２１と定義し、本体部１０の軸心Ａに対する傾きが第１燃料噴射孔２１よりも大きい燃料噴射孔２０の１つを第２燃料噴射孔２２と定義した場合、研磨工程において、第１燃料噴射孔２１に流す研磨流体の単位時間当りの流量を、第２燃料噴射孔２２に流す研磨流体の単位時間当りの流量よりも多くする。【選択図】図３