ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (4): 525592-525592.

• Articles •

### Test on electrolytic modification of cross hole intersection

SHEN Zhenyu1, FU Xiuqing1, WANG Qingqing2, ZHANG Hongwen3, ZHANG Cheng1, TAO Yichen1, LI Jia1, GU Yanqing3

1. 1. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China;
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. School of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832003, China
• Received:2021-03-29 Revised:2021-04-22 Published:2021-07-09
• Supported by:
Jiangsu Agricultural Science and Technology Innovation Fund(CX (20) 3085);the Fundamental Research Funds for the Central Universities(KYXJ202002);Innovative Development Special Project of Shihezi University(CXFZ202015);High-level Talents Research Start-up Fund Project of Nanjing Agricultural University(104-804003)

Abstract: To improve the fuel efficiency of the engine, prolong the service life of the fuel injection body and reduce the maintenance cost, the electrochemical machining technology and the cathode of the intersecting structure were used to conduct the experimental research on deburring and transition arc modification at the intersection of the cross holes in the fuel injection body. After modification, the radius of the transition arc at the intersecting area was R=(2.0±0.2) mm. The mathematical model of electrolytic modification process at the intersection of the cross holes was established. The numerical solution of electrochemical modification process under different machining time and voltage was carried out based on COMSOL. The process test of electrolytic modification process at the intersection of cross holes was carried out, and the transition arc radius obtained from numerical solution and modification test under the same process parameters was compared and analyzed to verify the accuracy of the mathematical model of the modification process. Moreover the change rule of the transition arc radius at the intersection with the processing time and voltage was obtained. The results show that when the machining time is t=360 s and the machining voltage is U=12 V, and when the machining time is t=420 s and the machining voltage is U=10 V, the transition arc radius obtained from the numerical solution and the modification test can meet the requirements of the transition arc radius R=(2.0±0.2) mm, and the contour of the transition arc is obvious at the intersection of the cross holes after the modification.

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