|Table of Contents|

Electrochemical machining ofrocket engine turbopump shaft(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2022年02期
Page:
127-132
Research Field:
目次
Publishing date:

Info

Title:
Electrochemical machining ofrocket engine turbopump shaft
Author(s):
MA Changjin1; LIU Jia2; WANG Wenzhao1; XIE Herui1; HUO Shihui3
(1.Xian Aerospace Engine Limited Company, Xian 710100, China 2.Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 3.Xian Aerospace Propulsion Instilute, Xian 710100, China)
Keywords:
hole enlargement electrochemical machining cathode design electrolyte flow rate parameter optimization
PACS:
TG662
DOI:
-
Abstract:
A liquid rocket engine turbopump shaft cavity adopts stepped deep hole structure, the diameter of deep hole with length of 424 mm was needed to be enlarged from φ71.8 mm to φ89 mm. Using conventional machining, there are problems such as easy to shake the tool, poor heat dissipation conditions, processing extremely difficult, high cost etc. A workpiece rotation, the cathode adjustable type servo feed electrochemical machining methods was proposed to solve deep hole reaming problem with large depth to diameter ratio, with the aid of flow field simulation technology. Which was completed within the edge of the tool cathode blade optimization design, long blade cathode electrolyte nozzle structural design and optimization, transition arc cathode contour design and optimization, the adaptability of restructuring and finished the processing device. Electrolytic reaming technology of electrolytic machining parameters optimization was present in the electrolyte concentration of 20(sodium nitrate solution), electrolyte temperature 29-33 ℃, electrolyte inlet pressure 0.3 MPa, voltage 20 V, cathode feeding speed 0.02 mm/min, motor speed 8 r/min processing conditions, with the ultrasonic thickness measuring instrument in the machine to detect the remaining wall thickness. The cathode was dynamically adjusted to produce a shaft deep hole structure with roundness and coaxiality better than φ0.02 mm and diameter accuracy better than 0.2 mm.

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