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A novel method for solving shortest tool length based on compressing 3D check surfaces relative to tool postures

Chinese Journal of Aeronautics 2021年第2期34卷 641-658页

作者： Xiangyu LI Junxue REN Ximing LV Yuke ZHOU Congle LIU Key Laboratory of High Performance Manufacturing for Aero Engine(Northw estern Polytechnical University) Ministry of Industry and Information TechnologyXi'an 710072China

Solving the shortest tool length quickly under a known tool trajectory in multi-axis machining of complex channel parts is an urgent problem in industrial production. To solve this problem, a novel and efficient method is proposed which is featured by extracting only a few necessary curves from the check surface instead of sampling the entire surface. By rotating and compressing the 3 D check surface relative to all tool postures, the boundaries of the area occupied by the 2 D compressed surfaces are the essential elements for determining the shortest tool length. A tracking-based numerical algorithm is introduced to efficiently solve the silhouette curves which are formed in compressing. To define the multi-taper shaped tool holding system(THS) which is commonly used in production, a characterization model for THS profile is established. A model for solving the shortest tool length is finally constructed based on the critical interference relationship between the THS profile and all compressed boundary curves. For acceleration, the boundary splines are segmented according to their knot vectors. Then a new concept called the axis-aligned tool length box(AATB) is introduced,which can provide a conservative range of tool length for a spline segment. By scanning the AATBs of all spline segments, the very few effective spline segments that may ultimately determine the shortest tool length are filtered out. This acceleration method makes the solution for the shortest tool length more focused and efficient. The results of experimental examples are also reported to validate the efficiency and accuracy of the proposed algorithm.

关键词： CNC Compressed check surface multi-axis machining Shortest tool length Silhouette curve Tool holding system

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维普期刊数据库

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Realization of a 5-axis NURBS Interpolation with Controlled Angular Velocity

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Chinese Journal of Aeronautics 2012年第1期25卷 124-130页

作者： LIU Yuan LI Hui WANG Yongzhang School of Astronautics Harbin Institute of TechnologyHarbin 150001China School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China

5-axis machine tool plays an important role in high-speed and high-precision computer numerical control （CNC） machining of workpieces with complex shapes. A non-uniform rational B-spline （NURBS） interpolation format for 5-axis machining is pro- posed to adapt to the high speed machining （HSM）. With this interpolation format, angles between orientation vectors are chosen as parameters of orientation B-spline constructed by an open controller to achieve reasonable orientation vectors in real-time interpolation process. Coordinated motion between linear axes and rotary axes is achieved by building a polynomial spline which relates interpolation arc lengths of position spline to angles of orientation spline. Algorithm routine of this interpolation format and its realization methods in the supported controller are discussed in detail. Finally, performance of the proposed NURBS in- terpolation format is demonstrated by a practical example.

关键词： CNC system sculptured surface motion control NURBS interpolation multi-axis machining

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维普期刊数据库

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ESTIMATING　THE　CUTTER＇S　MAXIMUM　DIAMETER　IN　5－axis　NC　FACE　MILLING　OF　TURBINE　BLADES

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Computer Aided Drafting,Design and Manufacturing 1996年第2期6卷 57-64页

作者： Li Ming Zhu Xinxiong(Department of Manufacturing Engineering Beijing University of Aeronautics and Astronautics Beijing,100083)P.R.China

Based on the principles of differential geometry,the basic equations are derived for generating gouging free tool path in 5-axis NC face milling,the influence of surface's local geometry is discussed,and the condition... 详细信息

关键词： ss:gouging free cutting multi-axis machining NC programming tool path generation

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