Modares Mechanical Engineering

Modares Mechanical Engineering

Analysis of the Effects of Machining Loads on Online Values of Reaction Forces in Fixture Locating System

Document Type : Original Research

Authors
Hadi Parvaz
Mehdi Heidari
Seyed Vahid Hosseini
Department of Manufacturing, Production, and Mechatronics, Faculty of Mechanical and Mechatronics Engineering, Shahrood University of Technology, Shahrood, Iran
Abstract
The magnitude of reaction forces in locating points is considered as one of the basic parameters in the fixture planning and element design stages of the fixture design procedure. The magnitude of these forces depends on the intensity, position, and orientation of the transient clamping and active machining forces and torque. Analysis of the effect of machining force and torque on reaction forces is a complex process because the magnitude, position, and orientation of machining loads change at any given time. In this paper, an analytical model is presented to investigate the effect of machining loads on online values​​ of reaction forces in the contact points between the workpiece and the fixturing elements. The magnitude ​​and direction of machining forces and torque are calculated on the tool path and using these parameters as inputs to the analytical model, the reaction forces are calculated in each of the six locators at each moment. A finite element analysis is performed to validate the values predicted by the analytical model. For this purpose, the necessary subroutines are prepared and the values ​​of the reaction forces obtained from the simulation are compared to their corresponding values ​​from the analytical model. A three-dimensional workpiece with a 3-2-1 locating system was used as a case study to evaluate the performance of the proposed model. The maximum error in calculating the reaction forces was obtained as 10.85% from the proposed analytical model which indicates the accuracy of the theoretical predictions.
Keywords
Force Analysis
Locating
Jig and Fixture
Reaction Force
Machining Load

Subjects

[1] Chou Y-C, Chandru V, Barash MM. A Mathematical Approach to Automatic Configuration of Machining Fixtures: Analysis and Synthesis. J Eng Ind 1989;111:299–306. https://doi.org/10.1115/1.3188764.
[2] Lee SH, Cutkosky MR. Fixture Planning With Friction. J Eng Ind 1991;113:320–7. https://doi.org/10.1115/1.2899703.
[3] Cai W, Hu SJ, Yuan JX. Deformable Sheet Metal Fixturing: Principles, Algorithms, and Simulations. J Manuf Sci Eng 1996;118:318–24. https://doi.org/10.1115/1.2831031.
[4] Marin RA, Ferreira PM. Optimal Placement of Fixture Clamps: Minimizing the Maximum Clamping Forces. J Manuf Sci Eng 2002;124:686–94. https://doi.org/10.1115/1.1469520.
[5] Hurtado JF, Melkote SN. A model for synthesis of the fixturing configuration in pin-array type flexible machining fixtures. Int J Mach Tools Manuf 2002;42:837–49. https://doi.org/10.1016/S0890-6955(02)00009-3.
[6] Kang Y, Rong Y, Yang JC. Computer-Aided Fixture Design Verification. Part 3. Stability Analysis. Int J Adv Manuf Technol 2003;21:842–9. https://doi.org/10.1007/s00170-002-1401-4.
[7] Kaya N, Ozturk F. The Application of Chip Removal and Frictional Contact Analysis for Workpiece-Fixture Layout Verification. Int J Adv Manuf Technol 2003;21:411–9. https://doi.org/10.1007/s001700300048.
[8] Halevi G, Weill RD. Principles of Process Planning. Dordrecht: Springer Netherlands; 1995. https://doi.org/10.1007/978-94-011-1250-5.
[9] Kaya N. Machining fixture locating and clamping position optimization using genetic algorithms. Comput Ind 2006;57:112–20. https://doi.org/10.1016/j.compind.2005.05.001.
[10] Satyanarayana S, Melkote S. Finite element modeling of fixture–workpiece contacts: single contact modeling and experimental verification. Int J Mach Tools Manuf 2004;44:903–13. https://doi.org/10.1016/j.ijmachtools.2004.02.010.
[11] Wang Y, Chen X, Liu Q, Gindy N. Optimisation of machining fixture layout under multi-constraints. Int J Mach Tools Manuf 2006;46:1291–300. https://doi.org/10.1016/j.ijmachtools.2005.10.014.
[12] Chen W, Ni L, Xue J. Deformation control through fixture layout design and clamping force optimization. Int J Adv Manuf Technol 2008;38:860–7. https://doi.org/10.1007/s00170-007-1153-2.
[13] Parvaz H, Nategh MJ. A pilot framework developed as a common platform integrating diverse elements of computer aided fixture design. Int J Prod Res 2013;51:6720–32. https://doi.org/10.1080/00207543.2013.832000.
[14] Jiang K, Zhou X, Li M, Kong X. A multi-objective optimization and decision algorithm for locator layout continuous searching in checking fixture design. Int J Adv Manuf Technol 2013;67:357–66. https://doi.org/10.1007/s00170-012-4489-1.
[15] Xiong L, Molfino R, Zoppi M. Fixture layout optimization for flexible aerospace parts based on self-reconfigurable swarm intelligent fixture system. Int J Adv Manuf Technol 2013;66:1305–13. https://doi.org/10.1007/s00170-012-4408-5.
[16] Parvaz H, Nategh MJ. Development of locating system design module for freeform workpieces in computer-aided fixture design platform. Comput Aided Des 2018;104:1–14. https://doi.org/10.1016/j.cad.2018.04.004.
[17] Nategh MJ, Parvaz H. Development of computer aided clamping system design for workpieces with freeform surfaces. Comput Aided Des 2018;95:52–61. https://doi.org/10.1016/j.cad.2017.10.003.
[18] Parvaz H. Analytical and Numerical Investigation of Reaction Forces in Fixturing of Rigid Workpiece with Polyhedral Geometry. J Solid Fluid Mech 2020;10:17–29. https://doi.org/10.22044/JSFM.2020.8494.2925.
[19] Altintas Y. Manufacturing Automation. Cambridge: Cambridge University Press; 2011. https://doi.org/10.1017/CBO9780511843723.
[20] Budak E, Altintas¸ Y, Armarego EJA. Prediction of Milling Force Coefficients From Orthogonal Cutting Data. J Manuf Sci Eng 1996;118:216–24. https://doi.org/10.1115/1.2831014.
[21] Boyer R, Collings EW, Welsch G. Materials Properties Handbook: Titanium Alloys. ASM International; 1994.
Modares Mechanical Engineering
Volume 21, Issue 9
September 2021
Pages 615-628