Parametric design and surface topography analysis of turbine blade processing by turn-milling based on CAM ORIGINAL ARTICLE First Online: 26 July 2019 Abstract
The design and manufacturing level of the blade largely affects the performance of the aero engine. In this paper, the blade is taken as the research object, focusing on its design and processing. On the one hand, based on the mathematical method of fifth-order polynomial, a GUI module for parameterized design of different blade profiles is established. On the other hand, in CAM environment, the procedure division of turn-milling the blade, the generation of tool path, the optimization of NC program and the simulation of machining process are completed. On this basis, the experiment of machining the part by turn-milling is finished. In addition, in order to study the quality of the machined surface, a mathematical model for predicting the surface topography of turn-milling blade is established based on the surface unfolding and meshing of the workpiece. Then, the effects of the number of cutter teeth, tool rotation speed, feed rate, and the cutter radius on surface topography are analyzed qualitatively. Besides, the maximum surface residual height is used as an index to quantitatively compare the influence of different parameters on surface topography. Finally, the simulation reliability is verified by comparing with the experimental surface.
Keywords Blade Profile design Virtual machining Turn-milling Surface topography Nomenclature b
Chord length (
mm) f max
Leading edge angle (°)
Trailing edge angle (°)
Import (front) structural angle (°)
Exit (trailing edge) structural angle (°)
Installation angle (°)
Outlet angle (°)
τ = b/ t i
Attack angle, the difference between
β 1 and β 1. (°) k δ
Bend angle, the sum of
β 1 and k β 2. (°) k t
Grid pitch (
mm) r 1
Leading-edge radius (
mm) r 2
Trailing-edge radius (
mm) C max
Maximum thickness (
mm) φ 1
Leading edge wedge angle of inlet edge (°)
Leading edge wedge angle of exit edge (°)
Throat width (
Axial width of blade profile (
mm) N b
Number of blades
Tool rotation speed (
rpm) n w
Workpiece rotation speed (
rpm) n w, relative
Relative speed of the workpiece (
rpm) n w, ave
The average value of relative rotational speed of workpiece (
rpm) a p
Cutting depth (
mm) R t
Tool radius (
mm) R w
Workpiece radius (
Instantaneous rotation angle of workpiece
Residual height of the workpiece surface after each feed of the tool (
Residual height of the machined surface (
μm) R s
Instantaneous radius at the edge of blade section (
Total feed rate (
mm/ z) c a
Axial feed per tooth (
mm/ z) c z
Circumferential feed per tooth (
mm/ z) f a
Axial feed per second (
mm/ s) N t
Number of cutter teeth
Notes Funding information
This work was supported by the National Natural Science Foundation of China (NSFC; 51475087).
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