Research On Tool Path Dynamical Analysis And Optimize Method For The Multi-axis Machining

The blade is one of the important parts of aero-engine. Efficiency and precision are important for the blades' machining. Recent years, based on "fixed contour", the key laboratory of contemporary design and integrated manufacturing ministry of education. Northwestern Polytechnical University explored a new NC scheme: Spiral machine, which can be carried out on the ordinary 4 or 5 axis NC machine .It has more advantages than traditional method. Such as fewer times of fixation, more smooth trajectory, higher quality surface and efficiency.With this scheme, however, technologist found that there are a series of small concavity on the edge of the blade, and it can become the most reason that cause the reject, extremely. Therefore, there are few models of the blade can be manufactured by this scheme. Most of the blade has to be milled by "fixed contour", although they can generate spiral tool path.This paper is focused on the "small concavity". After research the CNC machine performance, CLS file, which use to create the NC Code and the approach of the post process. This paper finds the key reasons which cause the "small concavity". And provide some methods to avoid the "small concavity". Subsequently, based on characteristic of tool dynamical, this paper proposed to optimize the feed rate in the CLS file.One of the blades was machined by the method and the result compare to the old one. It is demonstrated that integrating these limitations with the feed rate planning results in a feasible feed rate. The method proposed in the paper can effectively restrain the "small concavity" on the edge of the blades, and can improve the machining efficiency more than 40%. It becomes possible that the use of the spiral machine on the other types of blade.