Voronoi diagram-based tool path compensations for removing uncut material in 2½D pocket machining

Mansor, Mohd Salman Abu; Hinduja, S.; Owodunni, Oladele

doi:10.1016/j.cad.2005.09.001

Cited by 27 publications

(9 citation statements)

References 6 publications

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“…The type of uncut areas lead by CPO can be identified as corner uncut, center uncut, and neck uncut [5]. Mansor et al [6] further subdivided the corner uncut area into five different types, the center uncut area into four, and the neck uncut area into two through a systematic enumeration of the topology and geometry of the bisectors and window lines. They detected the uncut regions based on a pixel 2D cut simulation method suggested by Choi and Kim [5].…”

Section: Residual Area Identificationmentioning

confidence: 99%

“…Then, they identified the region(s) covered by cutters by utilizing the tool paths and computed the regions with the function in the OpenGL graphic library. To remove uncut regions caused by CPO, uncut free pocketing tool-paths generation based on PWID offset algorithm [8] and tool path compensations [6,9,10] based on Voronoi diagram [6], geometry analysis [9] and offset method [10] have received attention from several researchers. However, tool paths in these references do not satisfy the special requirements of residuals machining discussed above and are not fit for uncut regions caused by PARC.…”

Section: Residual Area Identificationmentioning

confidence: 99%

“…The key steps of the rolling disk motion method are as follows: (1) establishment of the BLC: given the contour and island boundaries, establish the corresponding basic point list, and the basic line list; (2) computation of the spanned arc: given the basic point list and the basic line list, calculate all the spanned arcs between two basic lines, between basic point and basic line, and between basic points in order; (3) judgment of the validity of a spanned arc: identify and keep the effective spanned arcs according to the validity rules; (4) computation of the CLC: divide the basic line by the endpoints of valid spanned arcs and decide contact edges due to the parity of the points' numbers; (5) construct the CLC: construct the CLC by linking the contact edges and the spanned arcs in order; (6) reconstruct the CLC: recombine the CLCs which intersect each other; (7) calculation of the residual areas: machinable area is the union of areas bounded by the CLCs. Thus, the residual regions can be obtained by subtracting the machinable area from the machining area.…”

Section: Residual Areas Identification/computationmentioning

confidence: 99%

See 2 more Smart Citations

Identification and looping tool path generation for removing residual areas left by pocket roughing

Zhou

Zheng

Chen

2016

Int J Adv Manuf Technol

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For pocket with complex geometry shape, lots of residuals will be left after pocket roughing. These uncut regions always are around sharp corners, bottlenecks, and sidewalls with small areas and soft edges. Additionally, as most of the stock material has been removed, the thin wall between two adjacent pockets tends to deform when machining the residuals. Thus, certain technological requirements such as starting from the soft edge, retaining down-milling, and keeping constant feed rate are needed to machine the unmachined materials. However, little research has been carried out on this problem. In this paper, to remove the various uncut areas left by the pocket roughing, residual regions are identified first by the rolling disk motion method. Then, looping tool paths are designed and computed for corner, bottleneck, and sidewall residuals respectively. The proposed tool path satisfies downmilling, G1 continuous, and progressive radial depth of cut with consideration of the soft edge. Finally, an example is rendered to validate that the advised algorithm can identify the remained areas correctly, and the generated tool path meets the special requirements of clean-up regions machining.

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Section: Residual Area Identificationmentioning

confidence: 99%

Section: Residual Area Identificationmentioning

confidence: 99%

Section: Residual Areas Identification/computationmentioning

confidence: 99%

See 1 more Smart Citation

Identification and looping tool path generation for removing residual areas left by pocket roughing

Zhou

Zheng

Chen

2016

Int J Adv Manuf Technol

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“…Park and Choi [32] appended clear-up tool paths to the nearest offset curve after the uncut regions are detected through observation results. Mansor et al [33] proposed a Voronoi diagram-based uncut region removal algorithm. In our previous work in [34], an efficient uncut region removal method is developed, inspired by the idea to link all the uncut regions into a clear-up tool path in a global point of view.…”

Section: Uncut Region Removalmentioning

confidence: 99%

Smooth contour-parallel tool path generation for high-speed machining through a dual offset procedure

Lin

Shen

et al. 2015

Int J Adv Manuf Technol

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In generating a contour-parallel tool path, traditional offset methods usually offer an arc rounding option for superior sharp corners. For the inferior ones, however, they are left untreated. The inferior sharp corners are harmful to high-speed machining (HSM). They should be dealt with when they emerge for the first time; otherwise, they will be further inherited by the offset successors. In this paper, we presented a dual offset procedure to round the inferior sharp corners. For a given path, literally, the procedure conducts two offsets: at first, the path is offset inwards, generating an intermediate curve; then, this curve is further offset outwards, outputting the dual offset curve. The dual offset curve is guaranteed to be smooth. It is used to replace the original path. One side effect of this procedure is that many uncut regions will be left in the corner areas. These uncut regions are detected through a Boolean operation and removed by smooth clearup tool paths. Finally, the dual offset and clear-up tool paths are connected with a set of linking arcs. The proposed smooth tool path generation method is implemented and verified by several examples. Comparative cutting simulations show that this method has a potential to improve the machining efficiency in terms of HSM with nearly a zero cost.

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“…3 consider only the innermost window and the bisector segments within it, i.e. consider nodes 13,14,15,18,19, and 20 and edges 8, 9, 10, 11, 22, 23, 28, 29, and 32. If node 15 is assumed to be the starting node, then part of the resulting tree is shown in Figure 4.…”

Section: Traversal Of the Attributed Graphmentioning

confidence: 99%

Voronoi-diagram-based linking of contour-parallel tool paths for two-and-a-half-dimensional closed-pocket machining

Hinduja

Mansor

Owodunni

2010

Proceedings of the Institution of Mechanical Engineers, Part B:

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Contour-parallel tool paths for machining milling features are formed by linking the offsets. Determination of links between offsets and the sequence in which the offsets should be traversed is a major problem. Results of efforts to link tool paths from academic researchers and developers of commercial computer-aided manufacturing (CAM) systems have shortcomings which include the fact that the linking strategies (a) are not based on clear geometric principles, (b) are not optimal, (c) do not consider technological factors such as the amount of slotting, overmilling, mode of cutting, and (d) are either not gouge-free or use tool retractions to avoid gouging. To overcome these shortcomings, this paper presents a linking algorithm which employs segments on the Voronoi diagram as links. The technological factors, hitherto ignored in previous research are considered and their optimality is ensured by employing guidelines which were mostly developed through observations of tool paths generated from a general test bed. Multiple solutions obtained after pruning out unfeasible solutions can be evaluated by users using geometrical (total tool path length) and technological (amount of overmilling, slotting, etc.) considerations or a combination of the criteria. The implementation of the algorithm is tested by generating tool paths for two two-and-a-half-dimensional (2 1 / 2 D) milled features. When compared with those obtained from some commercial CAM systems, they are shorter by 5 to 31 per cent.

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Voronoi diagram-based tool path compensations for removing uncut material in 2½D pocket machining

Cited by 27 publications

References 6 publications

Identification and looping tool path generation for removing residual areas left by pocket roughing

Identification and looping tool path generation for removing residual areas left by pocket roughing

Smooth contour-parallel tool path generation for high-speed machining through a dual offset procedure

Voronoi-diagram-based linking of contour-parallel tool paths for two-and-a-half-dimensional closed-pocket machining

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