Geometrical deviations versus smoothness in 5-axis high-speed flank milling

Pechard, Pierre-Yves; Tournier, Christophe; Lartigue, Claire; Lugarini, Jean-Pierre

doi:10.1016/j.ijmachtools.2009.01.005

Cited by 62 publications

(22 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The smoothness of the motion of the milling tool is equally important for machining efficiency [11,15,29]. Lavernhe et.…”

Section: Previous Work and Contributionsmentioning

confidence: 99%

“…al [11] optimize the tool axis orientation to satisfy certain kinematic constraints which results in a higher speed of the tool and consequently in shorter machining time. Pechard et al [15] minimize the distance between the designed and machined surfaces while preserving the smoothness of the tool's trajectory. Zheng et al [29] use the strain energy of the tool axis trajectory to describe the geometric smoothness and formulate it as a multi-objective programming problem.…”

Section: Previous Work and Contributionsmentioning

confidence: 99%

See 1 more Smart Citation

Towards efficient 5-axis flank CNC machining of free-form surfaces via fitting envelopes of surfaces of revolution

Bartoň

Plakhotnik³

et al. 2016

Computer-Aided Design

View full text Add to dashboard Cite

We introduce a new method that approximates free-form surfaces by envelopes of one-parameter motions of surfaces of revolution. In the context of 5-axis computer numerically controlled (CNC) machining, we propose a flank machining methodology which is a preferable scallop-free scenario when the milling tool and the machined free-form surface meet tangentially along a smooth curve. We seek both an optimal shape of the milling tool as well as its optimal path in 3D space and propose an optimization based framework where these entities are the unknowns. We propose two initialization strategies where the first one requires a user's intervention only by setting the initial position of the milling tool while the second one enables to prescribe a preferable tool-path. We present several examples showing that the proposed method recovers exact envelopes, including semi-envelopes and incomplete data, and for general free-form objects it detects envelope sub-patches.

show abstract

“…The smoothness of the motion of the milling tool is equally important for machining efficiency [11,15,29]. Lavernhe et.…”

Section: Previous Work and Contributionsmentioning

confidence: 99%

Section: Previous Work and Contributionsmentioning

confidence: 99%

Towards efficient 5-axis flank CNC machining of free-form surfaces via fitting envelopes of surfaces of revolution

Bartoň

Plakhotnik³

et al. 2016

Computer-Aided Design

View full text Add to dashboard Cite

show abstract

“…The second example is taken from Pechard et al [15]. The blades are machined with a unique trajectory for both sides (Fig.…”

Section: -Axis Flank Milling Of An Impellermentioning

confidence: 99%

“…6). The initial tool path is obtained minimizing the geometrical deviations as explained in [15]. Indeed as the surface of the blade is a non-developable ruled surface, the overcut and undercut cannot be avoided.…”

Section: -Axis Flank Milling Of An Impellermentioning

confidence: 99%

“…The fundamental idea is that the slowdowns on the feedrate come from the rotary drives, which appears to be too restrictive. The method proposed in [15] increases the smoothness by minimizing the energy of deformation of the tool path in the context of 5-axis flank milling. This allows a global optimization of the tool path but as it is realized in the Part Coordinate System, machine tool constraints are not taken into account.…”

mentioning

confidence: 99%

See 1 more Smart Citation

5-Axis tool path smoothing based on drive constraints

Beudaert

Pechard²,

Tournier

2011

International Journal of Machine Tools and Manufacture

Self Cite

115

View full text Add to dashboard Cite

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.

show abstract