Effect of Toolpath and Feed Rate on the Machining of Coons Surfaces
Boppana V. Chowdary1 & Anton Gittens
Department of Mechanical and Manufacturing Engineering
The University of the West Indies
St. Augustine, Trinidad and Tobago
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ABSTRACT
In this study, complex shapes are defined as the sculptured surfaces created by the blending of curves, to form surface patches. Past investigations show that non-uniform rational B-Splines (NURBS) curves are the most appropriate for the modeling of sculptured surfaces. The main objective of this research is to examine the effects of toolpath and feed rate variations on the machining of the Coons surface, which is modeled through NURBS. Based on simulation results, it is clear that toolpath and feed rate selection plays a significant role in sculptured surface machining. In particular, the toolpath selection seemed to have a greater effect on the surface finish and machining time than the feed rate. The results also show that the feed rate option has a much greater effect on roughing than finishing operations. It can also be seen in this research that the toolpath option played a more significant role than feed rate selection in determining the file size.
Keywords: Sculptured Surface Modeling, NURBS, Blending Function, Feed Rate, Toolpath, Computer Aided Design and Manufacturing
References
[1] Han, Z. and Yang, D.C.H. (1999). Iso-phote based tool-path generation for machining free-form surfaces, Journal of Manufacturing Science and Engineering, Transactions of the ASME, 121(1), 656-664.
[2] Suresh, K. and Yang, D.C.H. (1994). Constant scallop-height machining of free-form surfaces, Journal of Engineering for Industry, Transactions of the ASME, 116(2), 253-259.
[3] Krouse, J.K. (1981). Sculptured surfaces for CAD/CAM, Machine Design, 53(5), 115-120.
[4] Baptista, R. and Antune Simoes, J.F. (2000). Three and five axes milling of sculptured surfaces, Journal of Materials Processing Technology, 103(3), 398-403.
[5] Jerard, R.B., Fussell, B.K., Hemmett, J.G. and Ercan, M.T. (2000). Toolpath feed rate optimization: A case study. Proc. NSF Design and Manufacturing Research Conference, Vancouver, British Columbia, Canada.
[6] Engin, S. and Altintas, Y. (2001). “Mechanics and dynamics of general milling cutters part I: helical end mills,” International Journal of Machine Tools and Manufacture, 41(15), 2195 –2207.
[7] Chen, Z.C., Vickers, G.W. and Dong, Z. (2004). A new principle of CNC tool path planning for three-axis sculptured part machining - a steepestascending tool path, Journal of Manufacturing Science and Engineering,
Transactions of the ASME, 126(3), 515-523.
[8] Chen, T. and Ye, P. A. (2002). “Tool path generation strategy for sculptured surfaces machining,” Journal of Materials Processing Technology, 127 (3), 369 –373.
[9] Bertok, P. (1983). “A system for monitoring the machining operation by referring to a predicted torque pattern,” CIRP Annals, 32(1), 439-442. [10] Wang, W. P. (1988). “Application of solid modeling to automate machining parameters for complex parts,” Manufacturing Systems, 17(1), 57-63.
[11] Takata, S. (1989). “A cutting simulation system for machinability evaluation using a workpiece model,” CIRP Annals, 38 (1), 417-420. [12] Spence, A. D. (1992). “Solid modeller based milling process simulation,” Ph.D. Thesis, The University of British Columbia, Canada.
[13] Feng, H. and Menq, C. (1994). “The prediction of cutting force in ball-end milling process-part I: model formulation and model building procedure,” International Journal of Machine Tool Design and Manufacture, 34(5),
697-710.
[14] El-Mounayri, H., Spence, A. D. and Elbestawi, M. A. (1996). “Enhanced CAD/CAM for simulation and optimization of 3-5 axis milling of dies and molds,” Proc. CSME 13th Symposium on Engineering Applications of
Mechanics: Manufacturing Science and Engineering, McMaster University, Canada, 394- 401.
[15] Omirou, S.(2003). “NC Machining for revolved and swept surfaces with free-form profiles,” Journal of Materials Processing Technology, 132(1-3), 332 – 339.
[16] Chen, Z. C., Vickers, G. W. and Dong, Z. (2003). “Most efficient tool feed direction in 3-axis cnc machining. Integrated Manufacturing Systems,” 14(7), 554 – 566.
[17] Giri, V., Bezbaruah, D., Bubna, P. and Choudhury, A. R. (2005). “Selection of master cutter paths in sculptured surface machining by employing curvature principle,” International Journal of Machine Tools and Manufacture, 45(1), 1202 – 1209.
[18] Imani, B. M., Sadeghi, M. H. and Elbestawi, M. A. (1998). “Improved process simulation system for ball-end milling of sculptured surfaces,” International Journal of Machine Tools and Manufacture, 38(9), 1089 – 1107.
[19] Feng, H. –Y. and Su, N. (2000). “Integrated tool path and feed rate optimization for the finishing machining of 3D plane surfaces,” International Journal of Machine Tools and Manufacture, 40 (11), 1557 -1572.
20] Fussell, B. K., Jerard, R. B. and Hemmett, J. G. (2001). “Robust feedrate selection for 3-axis NC machining using discrete models - a steepestascending tool path,” Journal of Manufacturing Science and Engineering,
Transactions of the ASME, 123(1),214- 224.
[21] Bouzakis, K. D., Aichouh, P. and Efstathiou, K. (2003). “Determination of the chip geometry, cutting force and roughness in free form surfaces finishing milling with ball end tools,” International Journal of Machine
Tools and Manufacture, 43(5), 499 – 512.
[22] Hemmett, J. G., Fussell, B. K. and Jerard, R. B.(2001). “Robust feedrate selection for 3-axis NC machining using discrete models,” Journal of Manufacturing Science and Engineering, Transactions of the ASME, 123(1),
214-224.
[23] Jung, Y. H., Kim, J. S. and Hwang, S. M. (2001). “Chip load prediction in ball-end milling’, Journal of Materials Processing Technology, Vol.111, No.1-3, 250 – 264.
[24] Wang, J. J. J. and Zheng, C. M. (2002). “Identification of shearing and ploughing cutting constants from average forces in ball-end milling,” International Journal of Machine Tools and Manufacture, 42(6), 695 – 711.
[25] Mansour, S. (2002). “Automatic generation of part programs for milling sculptured surfaces’, Journal of Materials Processing Technology, 127(1), 31 – 44.
[26] Lazoglu (2003). “Sculpture surface machining: a generalized model of ballend milling force system,” International Journal of Machine Tools and Manufacture, 43(5), 453 – 265.
[27] Kim, G. M., Kim, B. H. and Chu, C. N. (2003). “Estimation of cutter deflection and form error in ball-end milling process,” International Journal of Machine Tools & Manufacture, 43, 917–924.
[28] Xu, A. P., Qu, Y. X., Zhang, D. W. and Huang, T. (2003). Simulation and experimental investigation of the end milling process considering the cutter flexibility. International Journal of Machine Tools and Manufacture, 43(3),
283 – 295.
[29] Lamikiz, A., De Lacalle, L. N. L., Sanchez, J. A. and Salgado, M. A. (2004). “Cutting force estimation in sculptured surface milling,” International Journal of Machine Tools and Manufacture, 44(14), 1511 – 1522.
[30] Kim, G. M. and Chu, C. N. (2004). “Mean cutting force prediction in ballend milling using force map method,” Journal of Materials Processing Technology, 146(3), 303 – 315.
[31] Sheu, J. J. (1999). “A three-dimensional CAD/CAM/CAE integration system of sculpture surface die for hollow cold extrusion,” International Journal of Machine Tools and Manufacture, 39, 33–53.
[32] Milfelner, M., Kopac, J., Cus, F. and Zuperl, U. (2005). “Genetic equation for the cutting force in ball-end milling,” Journal of Materials Processing Technology, 164–165, 1554–1560.
Effect of Toolpath and Feed Rate on the Machining of Coons Surfaces
