Abstract
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 clear-up 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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References
Park SC, Choi BK (2000) Tool-path planning for direction-parallel area milling. Comput Aided Des 32(1):17–25
Persson H (1978) NC machining of arbitrarily shaped pockets. Comput Aided Des 10(3):169–174
Held M, Lukács G, Andor L (1994) Pocket machining based on contour-parallel tool paths generated by means of proximity maps. Comput Aided Des 26(3):189–203
Held M (2001) VRONI: an engineering approach to the reliable and efficient computation of Voronoi diagrams of points and line segments. Comput Geom 18(2):95–123
Kim H-C (2010) Tool path generation for contour parallel milling with incomplete mesh model. Int J Adv Manuf Technol 48(5):443–454
Choi BK, Park SC (1999) A pair-wise offset algorithm for 2D point-sequence curve. Comput Aided Des 31(12):735–745
Shen HY, Fu JZ, Chen ZC, Fan YQ (2010) Generation of offset surface for tool path in NC machining through level set methods. Int J Adv Manuf Technol 46(9–12):1043–1047
Kimmel R, Bruckstein AM (1993) Shape offsets via level sets. Comput Aided Des 25(3):154–162
Kim K, Jeong J (1995) Tool path generation for machining free-form pockets with islands. Comput Ind Eng 28(2):399–407
Liu X-Z, Yong J-H, Zheng G-Q, Sun J-G (2007) An offset algorithm for polyline curves. Comput Ind 58(3):240–254
Lai Y-L, Wu JS-S, Hung J-P, Chen J-H (2006) A simple method for invalid loops removal of planar offset curves. Int J Adv Manuf Technol 27(11):1153–1162
Wong TN, Wong KW (1996) NC toolpath generation for arbitrary pockets with islands. Int J Adv Manuf Technol 12(3):174–179
Kim H-C, Lee S-G, Yang M-Y (2006) A new offset algorithm for closed 2D lines with Islands. International Journal of Advanced Manufacturing Technology 29(Compendex):1169–1177
Lee C-S, Phan T-T, Kim D-S (2009) 2D curve offset algorithm for pockets with islands using a vertex offset. Int J Precis Eng Manuf 10(2):127–135
Lin Z, Fu J, He Y, Gan W (2013) A robust 2D point-sequence curve offset algorithm with multiple islands for contour-parallel tool path. Comput Aided Des 45(3):657–670
Felkel P, Obdrzalek S (1998) Straight Skeleton Implementation. Proceedings of Spring Conference on Computer Graphics:210–218
Dhanik S, Xirouchakis P (2010) Contour parallel milling tool path generation for arbitrary pocket shape using a fast marching method. Int J Adv Manuf Technol 50(9–12):1101–1111
Park SC, Chung YC (2002) Offset tool-path linking for pocket machining. Comput Aided Des 34(4):299–308
Park SC, Chung YC, Choi BK (2003) Contour-parallel offset machining without tool-retractions. Comput Aided Des 35(9):841–849
Hinduja S, Mansor MSA, Owodunni OO (2010) Voronoi-diagram-based linking of contour-parallel tool paths for two-and-a-half-dimensional closed-pocket machining. Proc Inst Mech Eng B J Eng Manuf 224(B9):1329–1350
Dai N, Dong G, Liao W, Sun Y (2012) Dental restoration contour-parallel offset tool path links based on graph model. The International Journal of Advanced Manufacturing Technology:1–9
Fallböhmer P, Rodrı́guez CA, Özel T, Altan T (2000) High-speed machining of cast iron and alloy steels for die and mold manufacturing. J Mater Process Technol 98(1):104–115
Wang ZH, Yuan JT, Liu TT, Huang J, Qiao L (2015) Study on surface roughness in high-speed milling of AlMn1Cu using factorial design and partial least square regression. Int J Adv Manuf Technol 76(9–12):1783–1792
Monreal M, Rodriguez CA (2003) Influence of tool path strategy on the cycle time of high-speed milling. Comput Aided Des 35(4):395–401
Siller H, Rodriguez CA, Ahuett H (2006) Cycle time prediction in high-speed milling operations for sculptured surface finishing. J Mater Process Technol 174(1–3):355–362
Choy HS, Chan KW (2003) A corner-looping based tool path for pocket milling. Comput Aided Des 35(2):155–166
Zhao ZY, Wang CY, Zhou HM, Qin Z (2007) Pocketing toolpath optimization for sharp corners. J Mater Process Technol 192–193:175–180
Shi J, Bi Q, Zhu L, Wang Y (2015) Corner rounding of linear five-axis tool path by dual PH curves blending. Int J Mach Tools Manuf 88:223–236
Pateloup V, Duc E, Ray P (2004) Corner optimization for pocket machining. Int J Mach Tools Manuf 44(12):1343–1353
Pateloup V, Duc E, Ray P (2010) Bspline approximation of circle arc and straight line for pocket machining. Comput Aided Des 42(9):817–827
Choi BK, Kim BH (1997) Die-cavity pocketing via cutting simulation. Comput Aided Des 29(12):837–846
Park SC, Choi BK (2001) Uncut free pocketing tool-paths generation using pair-wise offset algorithm. Comput Aided Des 33(10):739–746
Mansor MSA, Hinduja S, Owodunni OO (2006) Voronoi diagram-based tool path compensations for removing uncut material in 2½D pocket machining. Comput Aided Des 38(3):194–209
Lin Z, Fu J, Shen H, Gan W (2013) Global uncut regions removal for efficient contour-parallel milling. Int J Adv Manuf Technol 68(5–8):1241–1252
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Lin, Z., Fu, J., Shen, H. et al. Smooth contour-parallel tool path generation for high-speed machining through a dual offset procedure. Int J Adv Manuf Technol 81, 1233–1245 (2015). https://doi.org/10.1007/s00170-015-7275-z
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DOI: https://doi.org/10.1007/s00170-015-7275-z