Based on the shortest-distance-curve-pair(SDCP) cutting error distribution calculation model, a new 5-axis clean-up machining algorithm for blade's root area machining with torus tool is proposed. In order to avoid interference, several constraints are established, which are to limit the error between each discrete point on the front edge of the centre circle of the torus tool and the offset surface of the workpiece to the control range, to enable the error between each discrete point on the back edge of the centre circle of the torus tool and the offset surface of the workpiece to be greater than zero, and to enable the error between each discrete point on the centre circle of the torus tool and the offset surface of adjacent surface to be greater than zero. Combined with the strip-width-maximization object function, a boundary tool positioning algorithm is proposed to obtain the optimization tool position vector and tool posture angles. The root area of a turbine blade of a certain aeroengine is taken as an example to carry out tool position optimization, machining simulation and milling, and the results verify the validity of the proposed method. This method can also be applied to significantly increasing the machining efficiency of the root area of a concave or a convex surface.
LI Zhibing, CHEN Zhitong, WANG Shuang, XU Rufeng
. 5-Axis Machining Technology of Turbine Blade's Root Area in Stripe-width-maximization Method with Torus Cutter[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011
, 32(9)
: 1722
-1731
.
DOI: CNKI:11-1929/V.20110810.1118.001
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