Research On Nozzle Aperture Of 3Cr13 Martensitic Stainless Steel In Ultrasonic Assisted Grinding

At present, the finish machining of aero engine fuel nozzle are mainly manual grinding and conventional grinding. But these two methods have problems such as poor consistency and poor roughness. Ultrasonic assisted grinding is a technology that superposition of ultrasonic vibration in the conventional grinding, and it have the advantages of ultrasonic machining and grinding. It can effectively improve the dimensional accuracy and surface quality of work-piece However, ultrasonic assisted grinding commonly applied in hard brittle material or graphic processing. The ultrasonic assisted grinding of 3Cr13 stainless steel used in aviation engine fuel nozzle was rarely investigated.In view of this, ultrasonic assisted grinding technology is developed for finish machining of aero engine fuel nozzle. Internal grinding experiments were conducted to investigate grinding performance in ultrasonic assisted grinding of 3Cr13 martensite stainless steel. Optimization of process parameters was used for the actual processing of the fuel nozzle. The main contents are as follows:(1) Based on the kinematics and single particle trajectory of ultrasonic assisted grinding. The influence of ultrasonic vibration is experimentally compared with that through conventional grinding. In the meantime, the tools of ultrasonic assisted grinding of martensitic stainless steel were optimized through the contrast test.(2) Single factor experiments of ultrasonic assisted grinding of martensitic stainless steel for the aero engine fuel nozzle were conducted to investigate the influence of the ultra-sonication, spindle speed, work-piece speed, feed rate, grinding particle size on the work-piece surface roughness. Processing parameters were optimized by orthogonal experiments of martensitic stainless steel in ultrasonic assisted grinding. The influence of ultra-sonication on the deformation layer of work-piece surface was explored by micro-hardness meter.(3) The processing parameters were optimized for the actual processing of the aero engine fuel nozzle according to the orthogonal experiments and the processing requirement of fuel nozzle. Finally, the fuel nozzle was processed and detected.