CNC double spiral tool-path generation based on parametric surface mapping

Zhou, Bo; Zhao, Jibin; Li, Lun

doi:10.1016/j.cad.2015.06.005

Cited by 25 publications

(9 citation statements)

References 32 publications

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“…A method of double-spiral toolpath generation for high-speed machining (HSM) has been proposed by Zhou, Zhao, and Li (2015). The basis of the spiral pattern is a solution of the heat equation and the corresponding iso-thermal curves.…”

Section: Introductionmentioning

confidence: 99%

Five-axis machining of STL surfaces by adaptive curvilinear toolpaths

Moodleah

Bohez

Makhanov

2016

International Journal of Production Research

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We propose a new framework for toolpath generation for five-axis machining of part surfaces represented by the StereoLithography (STL) format. The framework is based on flattening the STL part and generation of adaptive curvilinear toolpaths. The corresponding cost functions, designed to represent the accuracy and the efficiency of the toolpath, are scalar functions, such as the curvature, kinematic error, rotation angles, machining strip or material removal rate or a vector field when the tool moves along a curvilinear path partly or even entirely aligned with directions considered to be optimal. The adaptive toolpath exploits grid generation methods and biased space-filling curves, combined with adaptation to the boundary and the domain decomposition. The proposed methodology of the adaptive curvilinear toolpath (ACT) has been tested on a variety of STL surfaces, including a case study of STL dental parts. Machining crowns/ implants for four basic types of human teeth, molar, premolar, canine and incisor, has been considered and analysed. The reference methods are the standard iso-parametric path, MasterCam toolpath, and advanced methods of NX9 (former UG). The experiments show that there is no universal sequence of steps applicable to every surface. However, a correct choice of the tools available within the proposed ACT-framework always leads to a substantial improvement of the toolpath, in terms of its length and the machining time.

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Section: Introductionmentioning

confidence: 99%

Five-axis machining of STL surfaces by adaptive curvilinear toolpaths

Moodleah

Bohez

Makhanov

2016

International Journal of Production Research

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“…2(a) and 2(b). (3) Solution of partial differential equation (PDE) based methods [10,13,24]: Initially, this method was only applied for 2D pocket machining [10]. On 2D pocket region to be machined, the PDE problem is defined which is subject to Dirichlet boundary condition applied to the outside boundary of a pocket.…”

Section: Introductionmentioning

confidence: 99%

“…The iso-value curves of the PDE solution were used to guide the spiral tool path generation. Zhou et al [24] extended this method to the surface machining. Spiral tool paths generated by projecting Archimedean spiral in UG/NX: (a) when the slope of the surface increases, the path interval increases, especially when the normal of the surface is vertical to the projecting direction, no spiral tool path is generated and (b) when projecting Archimedean spiral onto the surface of nonrevolution, excessive rapid traversals and interruptions of path appear In their method, the iso-curves, which were the solution contours of PDEs of thermal conductivity model, were first constructed on the parametric domain formed by the surface projection maximum contour and the boundary condition.…”

Section: Introductionmentioning

confidence: 99%

“…Existing spiral path generation methods unfortunately suffer from some typical inherent limitations, such as selection of the desirable projecting direction of the planar spiral [18][19][20], preprocessing of complex offset curves [7,21,22], easily affected by the mesh [10,24] or mesh deformation [25,26]. To overcome these problems, a new spiral tool path generation method is presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Spiral Tool Path Generation Method on Mesh Surfaces Guided by Radial Curves

Sun

et al. 2018

Journal of Manufacturing Science and Engineering

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This paper presents a new spiral smoothing method to generate smooth curved tool paths directly on mesh surfaces. Spiral tool paths are preferable for computer numerical control (CNC) milling, especially for high-speed machining. At present, most spiral tool path generation methods aim mainly for pocketing, and a few methods for machining complex surface also suffer from some inherent problems, such as selection of projecting direction, preprocessing of complex offset contours, easily affected by the mesh or mesh deformation. To address the limitations, a new spiral tool path method is proposed, in which the radial curves play a key role as the guiding curves for spiral tool path generation. The radial curve is defined as one on the mesh surface that connects smoothly one point on the mesh surface and its boundary. To reduce the complexity of constructing the radial curves directly on the mesh surface, the mesh surface is first mapped onto a circular region. In this region, the radial lines, starting from the center, are planned and then mapped inversely onto the mesh surface, thereby forming the desired radial curves. By traversing these radial curves using the proposed linear interpolation method, a polyline spiral is generated, and then, the unfavorable overcuts and undercuts are identified and eliminated by supplementing additional spiral points. Spline-based technique of rounding the corners is also discussed to smooth the polyline spiral, thereby obtaining a smooth continuous spiral tool path. This method is able to not only greatly simplify the construction of radial curves and spiral tool path but also to have the ability of processing and smoothing complex surfaces. Experimental results are presented to validate the proposed method.

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“…Essa tendência, em constante evolução, permite criar desde formas simples a formas complexas, por meio da inserção de dados e parâmetros no projeto. Muitos projetos são gerados nessa tendência projetual: simulações de propriedades físicas (ZHU et al 2016); modelagem interativa digital do corpo humano aplicado ao desenvolvimento de produtos (BAEK et al, 2012); interpolação paramétrica (JIN et al, 2014); otimização de processos de usinagem (ZHOU et al, 2015) design de joias (STAMATI et al, 2004a(STAMATI et al, 2011b); a parametrização de superfícies NURBS se mostra como uma possível direção para a computação e também uma importante ferramenta para o design de produtos (HUE et al, 2015;STAVRIC et al, 2011) e de projetos arquitetônicos (ZBOINSKA, 2015).…”

Section: Introductionunclassified