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    • 4. 发明授权
    • Method of electrolytically finishing spray-hole of fuel injection nozzle
    • 燃油喷嘴喷孔电解精加工方法
    • US4578164A
    • 1986-03-25
    • US637728
    • 1984-08-06
    • Yukio MatsuiMitsuo Uchiyama
    • Yukio MatsuiMitsuo Uchiyama
    • C25F3/16F02M61/16F02M61/18B23H9/02
    • F02M61/182C25F3/16F02M61/16F02M61/166F02M61/168F02B2275/14F02M2200/8069Y02T10/123
    • A method of finishing spray-holes bored by machining in the body of a fuel injection nozzle for an IC engine by removing burrs that remain after machining around the inside mouth of each spray-hole. Employed is electrolytic polishing process wherein the nozzle body is made the anode. A tubular electrode having an insulator cover is inserted into the nozzle body, and electrolyte liquid is supplied through the tubular electrode to flow out through the spray-holes. An end portion of the insulator cover completely covers the tip portion of the electrode and comes into close contact with the inner surface of the nozzle body over an area in which the spray-holes are open. In the insulator cover, liquid passages are formed so as to inject the electrolyte liquid only at the location of the mouth of each spray-hole to thereby prevent dissolution of the nozzle body inner surface in unwanted areas. Accordingly the removal of the burrs is achieved without increasing the volume of dead space in the nozzle body.
    • 通过除去在每个喷孔的内部嘴部之后加工后留下的毛刺,在IC发动机的燃料喷嘴的主体中加工钻孔的方法。 采用电解抛光工艺,其中喷嘴体制成阳极。 具有绝缘体盖的管状电极被插入到喷嘴体中,并且通过管状电极供应电解液以通过喷孔流出。 绝缘体盖的端部完全覆盖电极的前端部分,并且在喷孔打开的区域上与喷嘴体的内表面紧密接触。 在绝缘体盖中,形成液体通道,以仅在每个喷孔的口部的位置注入电解质液体,从而防止喷嘴体内表面在不想要的区域中溶解。 因此,在不增加喷嘴体内的死空间的体积的情况下实现毛刺的去除。