A multi-objective tool-axis optimization algorithm based on covariant field functional

Yan, Cao; Lee, Chen-Han; Li, Xiyan; Zhang, Yuming; Min, Kang

doi:10.1016/j.jmsy.2018.04.012

Cited by 20 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On this basis, a novel method based on the best curvature matching was used to generate smoothing tool orientation [ 24 ]. Yana et al [ 25 ] proposed a mathematical framework to generate smoothing tool axis variation even on partial surfaces lacking G2 and/or G1 continuities. Wang et al [ 26 ] constructed a selection strategy for the smoothing tool axis from the discrete domain of feasible orientations.…”

Section: Introductionmentioning

confidence: 99%

Twin-Tool Orientation Synchronous Smoothing Algorithm of Pinch Milling in Nine-Axis Machine Tools

Song,

Zhu,

Xue

et al. 2024

Materials

View full text Add to dashboard Cite

Pinch milling is a new technique for slender and long blade machining, which can simultaneously improve the machining quality and efficiency. However, two-cutter orientation planning is a major challenge due to the irregular blade surfaces and the structural constraints of nine-axis machine tools. In this paper, a method of twin-tool smoothing orientation determination is proposed for a thin-walled blade with pinch milling. Considering the processing status of the two cutters and workpiece, the feasible domain of the twin-tool axis vector and its characterization method are defined. At the same time, an evaluation algorithm of global and local optimization is proposed, and a smoothing algorithm is explored within the feasible domain along the two tool paths. Finally, a set of smoothly aligned tool orientations are generated, and the overall smoothness is nearly globally optimized. A preliminary simulation verification of the proposed algorithm is conducted on a turbine blade model and the planning tool orientation is found to be stable, smooth, and well formed, which avoids collision interference and ultimately improves the machining accuracy of the blade with difficult-to-machine materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Twin-Tool Orientation Synchronous Smoothing Algorithm of Pinch Milling in Nine-Axis Machine Tools

Song,

Zhu,

Xue

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…Traditional machining methods make it difficult to meet their processing needs. Compared with three-axis computer numerical control (CNC) machine tools, five-axis CNC machine tools add two rotational axes based on the three translational axes so that the cutting tool can contact the part in any direction in the machining process [ 2 ]. Meanwhile, five-axis CNC machining has the properties of high efficiency, excellent flexibility, high precision, and good reliability; therefore, it has been widely used in free-form surface processing [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

A Multi-Scale Tool Orientation Generation Method for Freeform Surface Machining with Bull-Nose Tool

Dong

Song

et al. 2023

Micromachines

View full text Add to dashboard Cite

Free-form surface parts are widely used in industries, and they consist of intricate 3D surfaces such as molds, impellers, and turbine blades that possess complex geometrical contours and demand high precision. Proper tool orientation is crucial for ensuring the efficiency and accuracy of five-axis computer numerical control (CNC) machining. Multi-scale methods have received much attention and have been widely used in various fields. They have been proven to be instrumental and can obtain fruitful outcomes. Ongoing research on multi-scale tool orientation generation methods, which aim to acquire tool orientations that satisfy both macro- and micro-scale requirements, is significantly important for improving the machining quality of workpiece surfaces. This paper proposes a multi-scale tool orientation generation method that considers both the machining strip width and roughness scales. This method also ensures a smooth tool orientation and avoids interference in the machining process. First, the correlation between the tool orientation and rotational axis is analyzed, and feasible area calculation and tool orientation adjustment methods are introduced. Then, the paper introduces the calculation method for machining strip widths on the macro-scale and the roughness calculation method on the micro-scale. Besides, tool orientation adjustment methods for both scales are proposed. Next, a multi-scale tool orientation generation method is developed to generate tool orientations that meet the macro- and micro-scale requirements. Finally, to verify the effectiveness of the proposed multi-scale tool orientation generation method, it is applied to the machining of a free-form surface. Experimental verification results have shown that the tool orientation generated by the proposed method can obtain the expected machining strip width and roughness, meeting both macro- and micro-scale requirements. Therefore, this method has significant potential for engineering applications.

show abstract

“…B-spline (or NURBS) path smoothing, are preferred. The current smoothing methods of three-axis CNC tool path and robot linear position path are similar and mature (Yan et al , 2018; Min et al , 2020; Chen and Chen, 2019). Compared with position path smoothing methods, orientation path smoothing methods are more difficult.…”

Section: Introductionmentioning

confidence: 99%

A C2 continuous trajectory planning method for 6-DOF rotational robot manipulators

Min

Zhang

et al. 2022

Self Cite

View full text Add to dashboard Cite

Purpose The purpose of this paper is to propose a smooth double-spline interpolation method for six-degree-of-freedom rotational robot manipulators, achieving the global C2 continuity of the robot trajectory. Design/methodology/approach This paper presents a smooth double-spline interpolation method, achieving the global C2 continuity of the robot trajectory. The tool center positions and quaternion orientations are first fitted by a cubic B-spline curve and a quartic-polynomial-based quaternion spline curve, respectively. Then, a parameter synchronization model is proposed to realize the synchronous and smooth movement of the robot along the double spline curves. Finally, an extra u-s function is used to record the relationship between the B-spline parameter and its arc length parameter, which may reduce the feed rate fluctuation in interpolation. The seven segments jerk-limited feed rate profile is used to generate motion commands for algorithm validation. Findings The simulation and experimental results demonstrate that the proposed method is effective and can generate the global C2-continuity robot trajectory. Originality/value The main contributions of this paper are as follows: guarantee the C2 continuity of the position path and quaternion orientation path simultaneously; provide a parameter synchronization model to realize the synchronous and smooth movement of the robot along the double spline curves; and add an extra u-s function to realize arc length parameterization of the B-spline path, which may reduce the feed rate fluctuation in interpolation.

show abstract

A multi-objective tool-axis optimization algorithm based on covariant field functional

Cited by 20 publications

References 22 publications

Twin-Tool Orientation Synchronous Smoothing Algorithm of Pinch Milling in Nine-Axis Machine Tools

Twin-Tool Orientation Synchronous Smoothing Algorithm of Pinch Milling in Nine-Axis Machine Tools

A Multi-Scale Tool Orientation Generation Method for Freeform Surface Machining with Bull-Nose Tool

A C2 continuous trajectory planning method for 6-DOF rotational robot manipulators

Contact Info

Product

Resources

About