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柴油机喷油嘴针阀具有高精度、高硬度、高耐磨性的特点。用W18Cr4V 高速钢材料制造的针阀,淬火并回火后的硬度为HRC62～66, 主要采用磨研加工达到质量要求。加工该工件的Φ3_(-0.04)外圆是在外圆磨床工作台上,用两块V型铁支持Φ6外圆的两端实现定位的,用一条橡皮带压在中Φ6外圆上,由微形电机带动针阀转动,在外圆磨床上进行磨削(针阀有关尺寸及加工定位位置见附图)。由于材料难磨削、精度高、工件刚性差、加工面离定位点距离远等原因,磨削Φ3_(-0.04)外圆时总有5～25％的工件因同轴度和圆
Diesel injection needle valve with high precision, high hardness, high wear resistance characteristics. Needle valve made of W18Cr4V high-speed steel material, after quenching and tempering the hardness of HRC62 ~ 66, the main grinding process to achieve quality requirements. Φ3 _ (- 0.04) outer circle of the workpiece is machined on the cylindrical grinding table, with two V-shaped iron support Φ6 cylindrical ends to achieve positioning, with a rubber band in the Φ6 outer circle by the micro The motor drives the needle valve to rotate and grind on the cylindrical grinding machine (see the attached drawing for the dimension of the needle valve and the position of the processing and positioning). Due to the difficulty of material grinding, high precision, poor rigidity of the workpiece and the distance between the machined surface and the positioning point, 5-25% of the workpiece with Φ3_ (- 0.04)