A new curve-based approach to polyhedral machining

Jun, Cha-Soo; Kim, Dong-Soo; Park, Sehyung

doi:10.1016/s0010-4485(01)00110-5

Cited by 81 publications

(45 citation statements)

References 7 publications

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“…The CL surface is computed by offsetting the triangular mesh by the same amount as the cutter radius along the normal vectors of the vertices [17]. The iso-plane tool path is computed by slicing the offset mesh with a series of vertical planes [13,14]. For the tool path with a constant scallop height, the CL surface deformation and the tool path inverse deformation step is added to the isoplane tool path generation process.…”

Section: Surface Deformationmentioning

confidence: 99%

“…An iso-plane tool path generation method from a triangular mesh model has been considered. Here, slicing consists of three steps [13,14]: first, the triangular mesh is offset to the CL surface, which is also a triangular mesh with an invalid portion [13,[15][16][17]; second, a set of line segments is obtained by slicing the triangular mesh with twodimensional geometric elements; and third, the invalid portions of the tool path generated from the invalid portions of the CL surface are removed for gouge avoidance. It is a very effective method for gouge-free tool path generation, but the scallop height sharply increases at the sloped part.…”

Section: Introductionmentioning

confidence: 99%

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A CL surface deformation approach for constant scallop height tool path generation from triangular mesh

Kim

Yang

2005

Int J Adv Manuf Technol

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In this paper, we present a cutter location (CL) surface deformation approach for constant scallop height tool path generation from triangular mesh. The triangular mesh model of the stereo lithography (STL) format is offset to the CL surface and then deformed in accordance with the deformation vectors, which are computed by the slope and the curvature of the CL surface. In addition, the tool path, which is computed by slicing the deformed CL surface, is inversely deformed by those same deformation vectors to a tool path with a constant scallop height. The proposed method is implemented, and a tool path is generated and tested by simulation and by numerical control (NC) machining. The scallop height was found to be constant over the entire machined surface, demonstrating much better quality than that of mesh slicing, under the same constraints for machining time.

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Section: Surface Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A CL surface deformation approach for constant scallop height tool path generation from triangular mesh

Kim

Yang

2005

Int J Adv Manuf Technol

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“…Subsequently, a 2D toolpath is projected onto the meshed surface using a vertical slicing strategy. Jun et al [8] also began computing the CL surface. This CL surface is meshed and then sliced by parallel planes to obtain the toolpath.…”

Section: Introductionmentioning

confidence: 99%

Improvement of toolpath quality combining polynomial interpolation with reduction of toolpath points

Bouchenitfa

Chaves‐Jacob

Linares

et al. 2014

Int J Adv Manuf Technol

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Abstract:The aim of this study is to propose a 5-axis toolpath smoothing method in order to improve the quality of machined surfaces. Currently, toolpaths are commonly computed from CAD models presenting small geometrical discontinuities. These discontinuities may be caused by an insufficient quality of the CAD model (geometrical discontinuities) and the use of meshed surfaces (e.g. STL files). Normally, CAM systems generate linearly interpolated toolpaths. CNC options are then used on the machine to smooth the toolpath. The geometrical discontinuities of CAD models and linear toolpath interpolation may induce a unsmooth toolpath. This type of toolpath causes marks on the machined workpiece even if classical enhanced CNC options are used. Generally, these marks are unacceptable for the functionality of the workpiece. To reduce this problem, this study proposes a method to efficiently smooth toolpaths and consequently improve the obtained surface quality. The proposed method may be employed with high end controllers commonly used on 5-axis CNC machines. First, a five degree polynomial interpolation method is presented. This interpolation is computed to ensure geometrical continuity in the slope and curvature of the obtained toolpath. Next, a concatenation method is proposed to reduce the size of the CNC program and to improve the toolpath smoothness. Moreover, the purpose of this concatenation is to obtain an optimized repartition of points along the toolpath. Furthermore, in a reverse engineering process this method avoids surface reconstruction, decreasing the process time and improving the quality of the obtained surface. The efficiency of these methods is validated by the machining of biomedical prostheses. The CAD model used for the test is a meshed surface.2

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“…They have regained attention in CAD/CAM community for avoiding the unhandiness of parametric surfaces. It is a superior feature of them that tool path generation using triangular meshes is comparatively straightforward (19)(20)(21) , whereas the geometrical accuracy of these procedures highly depends on the condition of surface subdivision. In practice, the generation of accurate tool paths requires additional subdivisions or reconstruction of CAD data (22) .…”

Section: Introductionmentioning

confidence: 99%

Normal-Unit-Vector-Based Tool Path Generation Using a Modified Local Interpolation for Ball-End Milling

Sekine

Obikawa

2010

JAMDSM

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This paper describes a novel tool path generation for three-axis ball-end milling using a local interpolation. After a modified local interpolation using normal unit vectors is introduced, generation of a parametric offset geometry is presented based on the local interpolation. In tool path generation, determination of a path interval and tool feed planning, which can be applied to both the scanning-line and contour-line machining, are proposed using normal unit vectors. Through their examples, it was verified that the proposed procedures possessed simplicity and flexibility.

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A new curve-based approach to polyhedral machining

Cited by 81 publications

References 7 publications

A CL surface deformation approach for constant scallop height tool path generation from triangular mesh

A CL surface deformation approach for constant scallop height tool path generation from triangular mesh

Improvement of toolpath quality combining polynomial interpolation with reduction of toolpath points

Normal-Unit-Vector-Based Tool Path Generation Using a Modified Local Interpolation for Ball-End Milling

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