Research On Tool Path Generation Technology In The Multi-axis Belt Grinding For Blade

Blade elements of complex surfaces are key components for steam turbine, gas turbine and aero engine to provide energy resources and power. Its geometric accuracy and surface quality determine the efficiency of energy and power devices. Technology to manufacture blade elements represents the core competence of national manufacturing. The research on abrasive belt grinder of six-axis numerical control and process software for grinding with independent intellectual property solves the problem of grinding polishing for blade elements of complex surfaces, filling a domestic gap in this field, which is of great strategic significance for international competitiveness of devices providing energy resources and power.Based on the need for grinding polishing technology for blade and abrasive belt, this paper researches on structure of abrasive belt grinder, fixture design and grinding polishing technology, analyzes the structure and material of abrasive belt, which provides theoretical basis to select abrasive belt. On the premise of accuracy and efficiency for blade manufacture, grinding polishing parameters for blade and abrasive belt are analyzed.With consideration of research on abrasive belt grinding technology for blade, path for abrasive belt grinding is designed. On the premise of grinding quality and efficiency, contact form between contact disk and blade is studied to control the contact disk of abrasive belt. Then double-vector programming method is introduced to ensure the local geometrical matching between the surface of abrasive belt contact disk and blade. Because of the existence of axial vector noise point of contact disk, adaptive chord deviation monitoring method for impulse noise is applied to filter noises.According to the research on post-processing method for machine tool of random structure, post-processing technology for abrasive belt grinder of six-axis numerical control is designed. Simulation is carried on for verification of grinding path, According to the particular structure of the abrasive belt grinder, by adopting the methodology of post-process for arbitrary structural machine, the structural model of abrasive belt grinder of six-axis numerical control is established expressed by transformation matrix. The matrix is applied to transfer the CL data, which is obtained by double vector programming, to NC code which is attached to the NC system. Based on the realization of post-process, the simulation scheme is designed and finished for blade grinding. The validity of belt grinding tool path is confirmed.Based on the research results above, this thesis completes the CAM software development for grinding polishing technology for blade and abrasive belt, including the scheme design and development of the software, realization of trajectory planning for grinding polishing for blade and abrasive belt. Simulation and practical manufacturing are carried through for verification.