Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology

Nanjing, China

Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology

Nanjing, China
SEARCH FILTERS
Time filter
Source Type

Zhao J.,Nanjing University of Aeronautics and Astronautics | Zhao J.,Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology | Wang F.,Nanjing University of Aeronautics and Astronautics | Wang F.,Yancheng Institute of Technology | And 4 more authors.
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2013

An electrochemical machining (ECM) method suitable for free-form surface blades is proposed in this paper for the fine finishing operation of an integral impeller. A fractional-step method is first adopted to form a passage between adjacent blades. Then a shaping cathode is utilized to finish the blade to its requirements on the above basis. An experimental device for the electrochemical machining of blades is developed. The cathode shape is improved by the motion simulation software and the flow channel of the cathode is analyzed by a numerical simulation software during the design, so that the shape of the cathode and the electrolyte flow rate in the interelectrode meet the machining requirements. During the machining experiment, the motion path of the cathode is optimized to reduce its influence on the distribution of interelectrode gaps. A high frequency pulse power is used to reduce the interelectrode gap and improve blade machining accuracy in the experiments. The experimental results show that, the ECM process for the free-form surface blade is feasible and the precision of the machined blade in the integral impeller is significantly improved.


Shi Z.,Nanjing University of Aeronautics and Astronautics | Shi Z.,Jiangsu Province Key Laboratory of Precision and Micro manufacturing Technology | Shi Z.,Changzhou University | Ye W.,Nanjing University of Aeronautics and Astronautics | Ye W.,Jiangsu Province Key Laboratory of Precision and Micro manufacturing Technology
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2014

Generally a multi-axis motion algorithm based on S-shaped acceleration and deceleration is complicated, and its maximum feedrate in one interpolation line cannot be real-time adjusted. To solve these problems, a look-ahead algorithm with adjustable real-time feedrate is proposed, in which the connected speed is established according to the dynamic characteristics of a CNC machine tool and the angle between two interpolation lines. And an S-shaped acceleration and deceleration speed control method with acceleration following theory is presented. The proposed algorithm does not reduce the path interpolation precision with maximum connected speed between two lines, so that the entire line interpolation process is highly flexible and rapid, and can satisfy a modern CNC system's requirements for real-time look-ahead processing. Experimental results show that the proposed algorithm can effectively reduce the vibration of machine tool motion, improve processing efficiency and the surface quality of machined workpieces.


Xu J.,Nanjing University of Aeronautics and Astronautics | Xu J.,Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology | Zhang Z.,Nanjing University of Aeronautics and Astronautics | Zhang Z.,Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology | And 2 more authors.
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2014

The remarkable high temperature strength, significant resistance to heat and fatigue of nickel-based superalloys lead to their wide application in the turbine sections of jet engines. However, their excellent performance is also accompanied by poor cutting ability, especially in the profile machining of structural parts. This paper first reviews the application of nickel-based alloys in turbine sections and the latest development of high efficiency grinding process. Then, the limits of high efficiency profile grinding (HEPG) are analyzed and the existing solutions are reviewed. Finally, a new strategy is proposed to further develop the potential of profile grinding in nickel-based alloys.

Loading Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology collaborators
Loading Jiangsu Province Key Laboratory of Precision and Micro Manufacturing Technology collaborators