Research on Five-Axis Numerical Control Programming and Machining Technology of Micro Integral Impeller

Abstract

Micro integral impeller is the key component of micro aero-engine, and its machining quality will directly affect the performance of micro-engine. Aiming at the narrow flow path of the tiny integral blade, the large distortion of the blade and the large ratio of free-form surface and divided into main and double blades, the five-axis NC machining method of the micro-integral impeller is studied in this paper. The research on the five-axis NC machining method of the microintegrated impeller is carried out. Firstly, according to the structural characteristics of the micro integral impeller, the NC programming is carried out in Siemens NX software, and the obtained tool path is verified by 2D dynamic simulation and 3D dynamic simulation. Finally, the micro integral impeller is obtained through the milling test. There are no interference, overcutting, undercutting and other problems in the machining process. Thus, the correctness of the machining technology and machining method is verified.

Analysis of Milling Force and Optimization of Milling Trajectory for the NC Machining of Small Integral Impeller

“…In the past 10 years, domestic research institutions have also made breakthroughs in the micro-machining technology of integral impeller, using special processing technology, such as the NC machining technology, Harbin University of Technology, Beijing University of Technology, Northwestern University of Technology and other well-known universities have been able to successfully process millimeter-scale micro impellers. In 2017 through five-axis micro milling experiment Northwest Polytechnic University obtained an aluminum alloy micro and small integral impeller with diameter of 10mm, 6 blades [2]. Although five-axis NC machining technology has many advantages in the machining of complex surfaces, However, due to the complex structure, small size and strong integrity of the micro and small integral impeller, the NC machining of the small impeller is still very difficult, in order to reduce the deformation in the NC milling process of the impeller and improve the surface quality of the blade, the physical dynamic simulation of the milling force in the NC machining process of the integral small impeller is carried out based on the Deform 3D software, and the orthogonal test is designed with the tool path parameters as the main influencing factors.…”