液力研磨特性对喷孔内部结构均匀性的影响研究

Effects of Hydro Grinding on Symmetry of Nozzle Hole Geometry

基于上海光源同步辐射高能X射线断层扫描技术,建立了不同研磨磨料多种研磨时间下加工所得的五个单孔顶置喷嘴的内部结构三维模型,并通过对喷嘴内部结构参数的测量,对比分析了不同研磨磨料和研磨时间对喷孔内部结构均匀性的影响。研究结果表明:在不同的研磨加工条件下,喷孔入口直径、喷孔出口直径和喷孔长度在喷孔圆周方向数值波动均较小,均匀性较高;而喷孔入口圆角半径均明显分布不均匀,用低磨削能力的磨料进行长时间研磨加工可以改善喷孔入口圆角的分布不均匀;在对喷孔内部结构尺寸进行测量时,必须考虑喷孔入口圆角半径在圆周方向的数值波动,否则测量结果会存在较大的误差,其他参数的圆周数值波动则可忽略不计。

Basing on X-ray CT scan in Shanghai synchrotron radiation facility （SSRF）,the inner structure 3D model for 5 single-bole nozzles manufactured by different hydro grinding materials and time was established, their inner structure parameters were measured to compare the effects of hydro grinding on symmetry of nozzle hole geometry. Results reveal that under different grinding conditions, the fluctuations of nozzle hole inlet, outlet diameters and hole length along the hole circumference are small, while inlet fillets have obvious variation. The inlet fillet variation can be improved by applying wild abrasive materials and longer grinding time. The inlet fillet variation must be considered when measuring nozzle inner structure,or large deviation would be leaded. As to circumferential variations of other parameters are negligible.