The Domain of Admissible Orientation concept: A new method for five-axis tool path optimisation

Castagnetti, Cedric; Duc, Emmanuel; Ray, Priyadip

doi:10.1016/j.cad.2008.07.002

Cited by 120 publications

(47 citation statements)

References 22 publications

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“…Lavernhe et al (2008) proposed a model for predicting kinematical performance in five-axis milling within the context of high-speed machining. Castagnetti et al (2008) dealt with the optimization of tool paths in five-axis machining to improve the kinematic behavior of tools during milling using the domain of admissible orientation (DAO) concept expressed in the part coordinates system (P-system) and transformed into the machine coordinates system (M-system). Pekerman et al (2008) proposed the self-intersection detection and elimination method in freeform curves and surfaces.…”

Section: Introductionmentioning

confidence: 99%

Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

Zhang

2013

J. Zhejiang Univ. Sci. A

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Abstract:In five-axis machining, tool orientation above a blade stream surface may lead to tool collision and a decrease in workpiece rigidity. Hence, collisionless tool orientation smoothing (TOS) becomes an important issue. On the basis of a constant scallop height tool path, the triangular facets in the faces, vertices format are constructed from cutter contact (CC) using the Voronoi incremental algorithm. The cutter location (CL) points candidate set is represented by an oblique elliptic cone whose vertex lies at CC using NURBS envelope. Whether the CL point is above its CC is judged by the dot product between the normal vector and the point on triangulation nearest to the CL point. The curvatures at CC are obtained by fitting a moving least square (MLS) quadratic patch to the local neighborhood of a vertex and calculating eigenvectors and eigenvalues of the Hessian matrix. Triangular surface elastic energy is employed as the weight in selection from the NURBS envelope. The collision is judged by NURBS surface intersection. TOS can then be expressed by selecting a CL point for each CC point and converted into a numerical control (NC) code automatically according to the postprocessor type of the machine center. The proposed method is verified by finishing of a cryogenic turboexpander impeller of air separation equipment.

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Section: Introductionmentioning

confidence: 99%

Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

Zhang

2013

J. Zhejiang Univ. Sci. A

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“…A corner optimization is proposed in [9][10] but it is applied only in 3-axis machining. In 5-axis, different methods were proposed to smooth the rotary drives of a 5-axis milling machine [11][12][13]. The fundamental idea is that the slowdowns on the feedrate come from the rotary drives, which appears to be too restrictive.…”

Section: Introductionmentioning

confidence: 99%

5-Axis Flank Milling Tool Path Smoothing Based on Kinematical Behaviour Analysis

Beudaert

Pechard

Tournier

2011

AMR

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Abstract. In the context of 5-axis flank milling, the machining of non-developable ruled surfaces may lead to complex tool paths to minimize undercut and overcut. The curvature characteristics of these tool paths generate slowdowns affecting the machining time and the quality of the machined surface. The tool path has to be as smooth as possible while respecting the maximum allowed tolerance. In this paper, an iterative approach is proposed to smooth an initial tool path. An indicator of the maximum feedrate is computed using the kinematical constraints of the considered machine tool, especially the maximum velocity, acceleration and jerk. Then, joint coordinates of the tool path are locally smoothed in order to raise the effective feedrate in the area of interest. Machining simulation based on a N-buffer algorithm is used to control undercut and overcut. This method has been tested in flank milling of an impeller and can be applied in 3 to 5-axis machining.

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“…A corner optimization is proposed in [9][10][11] but it is applied only in 3-axis machining. In 5-axis, different methods were proposed to smooth the rotary drives of a 5-axis milling machine [12][13][14]. The fundamental idea is that the slowdowns on the feedrate come from the rotary drives, which appears to be too restrictive.…”

mentioning

confidence: 99%

5-Axis tool path smoothing based on drive constraints

Beudaert

Pechard²,

Tournier

2011

International Journal of Machine Tools and Manufacture

115

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In high speed machining, the real feedrate is often lower than the programmed one. This reduction of the feedrate is mainly due to the physical limits of the drives, and affects machining time as well as the quality of the machined surface. Indeed, if the tool path presents sharp geometrical variations the feedrate has to be decreased to respect the drive constraints in terms of velocity, acceleration and jerk. Thus, the aim of this paper is to smooth 5-axis tool paths in order to maximize the real feedrate and to reduce the machining time.Velocity, acceleration and jerk limits of each drive allow to compute an evaluation of the maximum reachable feedrate which is then used to localize the areas where the tool path has to be smoothed. So starting from a given tool path, the proposed algorithm iteratively smoothes the joint motions in order to raise the real feedrate. This algorithm has been tested in 5-axis end milling of an airfoil and in flank milling of an impeller for which a N-buffer algorithm is used to control the geometrical deviations. An important reduction of the measured machining time is demonstrated in both examples.

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The Domain of Admissible Orientation concept: A new method for five-axis tool path optimisation

Cited by 120 publications

References 22 publications

Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

5-Axis Flank Milling Tool Path Smoothing Based on Kinematical Behaviour Analysis

5-Axis tool path smoothing based on drive constraints

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