Analysis and optimization of fixture under dynamic machining condition with chip removal effect

Dynamic interactions in the tool–workpiece and workpiece–fixture systems significantly impinge on the quality of finished workpieces. The presented simulation system integrates the effects of workpiece fixture dynamics with the other factors contributing to the machining process dynamics. It provides more accurate prediction of the process output which helps in the design of the optimum fixture configuration prior to the production stage. Modelling of the frictional contact behaviour between the fixture element and the workpiece helps to improve the prediction accuracy of the simulation system which accelerates the convergence to the optimum fixture configuration design and consequently improves the machined part dimensional accuracy and geometric integrity. The developed simulation is capable of modelling complicated part geometries by interfacing with commercial ANSYS.V10® packages. This research work minimizes the deformation of workpiece using integrated optimization tool of Genetic algorithm (GA) and ANSYS Parametric Design Language (APDL) of finite element analysis. The same layouts given by the above optimization tool are used in the experimental setup and it is found that the improved geometric tolerance of squarness and flatness of the given workpiece. The chip removal effect and frictional contact between the workpiece and the fixture elements are taken into account based on element death technique and nonlinear finite-element analysis. A Case study of an open slot milling process illustrates the application of the proposed improved geometric tolerance approach.

[1]  Necmettin Kaya,et al.  The Application of Chip Removal and Frictional Contact Analysis for Workpiece–Fixture Layout Verification , 2003 .

[2]  Andrew Y. C. Nee,et al.  An intelligent fixture with a dynamic clamping scheme , 2000 .

[3]  Ali R. Yildiz,et al.  A novel hybrid immune algorithm for global optimization in design and manufacturing , 2009 .

[4]  K. Deb.  Genetic algorithm in search and optimization: the technique and applications , 1998 .

[5]  Kiran Solanki,et al.  Multi-objective optimization of vehicle crashworthiness using a new particle swarm based approach , 2012 .

[6]  Frank W. Liou,et al.  Fixture analysis under dynamic machining , 1997 .

[7]  Yoke San Wong,et al.  Off-line modelling and planning of optimal clamping forces for an intelligent fixturing system , 1999 .

[8]  UTPAL ROY,et al.  Geometric reasoning for re-allocation of supporting and clamping positions in the automated fixture design system , 1999 .

[9]  Huaizhong Li,et al.  Modelling of cutting forces in helical end milling using a predictive machining theory , 2001 .

[10]  Shreyes N. Melkote,et al.  Machining fixture layout optimization using the genetic algorithm , 2000 .

[11]  J. H. Faupel,et al.  Engineering design: A synthesis of stress analysis and materials engineering , 1981 .

[12]  Kalyanmoy Deb,et al.  An introduction to genetic algorithms , 1999 .

[13]  Zhou Xiao-lun.  On Optimizing Fixture Layout and Clamping Force Simultaneously Using Genetic Algorithm , 2005 .

[14]  Jianbin Xue,et al.  Deformation control through fixture layout design and clamping force optimization , 2008 .

[15]  Xinmin Lai.  Flexible assembly fixturing layout modeling and optimization based on genetic algorithm , 2004 .

[16]  Shreyes N. Melkote,et al.  Prediction of workpiece deformation in a fixture system using the finite element method , 2006 .

[17]  A. Shabana.  Substructure synthesis methods for dynamic analysis of multi-body systems , 1985 .

[18]  Andrew Y. C. Nee,et al.  Modeling, analysis, and verification of optimal fixturing design , 2004, IEEE Transactions on Automation Science and Engineering.

[19]  Warren R. DeVries,et al.  Optimization Methods Applied to Selecting Support Positions in Fixture Design , 1991 .

[20]  K. C. Seow,et al.  Conceptual Design of Fixtures using Genetic Algorithms , 1999 .

[21]  José F. Hurtado,et al.  Workpiece–fixture static friction under dynamic loading , 1999 .

[22]  Jung-Hua Yeh,et al.  Contact condition modelling for machining fixture setup processes , 1999 .

[23]  Ali R. Yildiz,et al.  Hybrid Taguchi-Harmony Search Algorithm for Solving Engineering Optimization Problems , 2008 .

[24]  K. P. Padmanaban,et al.  Dynamic analysis on optimal placement of fixturing elements using evolutionary techniques , 2008 .

[25]  Ali R. Yildiz,et al.  Cuckoo search algorithm for the selection of optimal machining parameters in milling operations , 2012, The International Journal of Advanced Manufacturing Technology.

[26]  Shabbir Choudhuri,et al.  An investigation into the use of spatial coordinates for the genetic algorithm based solution of the fixture layout optimization problem , 2002 .

[27]  S. Vijayarangan,et al.  Optimal design of a composite leaf spring using genetic algorithms , 2001 .

[28]  Ali R. Yildiz,et al.  Hybrid immune-simulated annealing algorithm for optimal design and manufacturing , 2009 .

[29]  J. Marcelin,et al.  Genetic Search Applied to Selecting Support Positions in Machining of Mechanical Parts , 2001 .

[30]  Tojiro Aoyama,et al.  Optimization of fixturing condition by means of the genetic algorithm , 1996 .

[31]  Martin W. Trethewey,et al.  An experimental evaluation of coefficients of static friction of common workpiece–fixture element pairs , 2000 .

[32]  M. C. Majumder,et al.  Optimal fixture parameters considering locator errors , 2011 .

[33]  Y.J.Gene Liao,et al.  Flexible multibody dynamics based fixture-workpiece analysis model for fixturing stability , 2000 .

[34]  Ali Rıza Yıldız,et al.  A novel particle swarm optimization approach for product design and manufacturing , 2008 .

[35]  Utpal Roy,et al.  Fixture design synthesis for a flexible manufacturing system , 1997 .

[36]  J. Arora,et al.  Review of formulations for elastostatic frictional contact problems , 2000 .

[37]  Shreyes N. Melkote,et al.  Improved workpiece location accuracy through fixture layout optimization , 1999 .

[38]  K. C. Chan,et al.  A Genetic Algorithm Based Approach to Optimal Fixture Configuration , 1996 .

[39]  Hua Chen,et al.  A Dual Optimization Model of Fixture Design for the Thin-walled Workpiece , 2007, 2007 10th IEEE International Conference on Computer-Aided Design and Computer Graphics.

[40]  Y G Liao,et al.  A genetic algorithm-based fixture locating positions and clamping schemes optimization , 2003 .

[41]  Shabbir Choudhuri,et al.  An investigation of the effectiveness of fixture layout optimization methods , 2002 .

[42]  Andrew Y. C. Nee,et al.  A computational geometry approach to optimum clamping synthesis of machining fixtures , 1999 .

[43]  Shreyes N. Melkote,et al.  Fixture Clamping Force Optimisation and its Impact on Workpiece Location Accuracy , 2001 .

[44]  Andrew Y. C. Nee,et al.  Modeling of Frictional Elastic Fixture–Workpiece System for Improving Location Accuracy , 1996 .

[45]  Shreyes N. Melkote,et al.  Optimal Fixture Design Accounting for the Effect of Workpiece Dynamics , 2001 .

[46]  Ali R. Yildiz,et al.  An effective hybrid immune-hill climbing optimization approach for solving design and manufacturing optimization problems in industry , 2009 .

[47]  Yiming Rong,et al.  Development of a finite element analysis tool for fixture design integrity verification and optimisation , 2005 .

[48]  S. J. Hu,et al.  Fixture layout optimization considering workpiece-fixture contact interaction: simulation results , 1998 .

[49]  David E. Goldberg,et al.  Genetic Algorithms in Search Optimization and Machine Learning , 1988 .

[50]  Steven Y. Liang,et al.  Analysis of Reactions and Minimum Clamping Force for Machining Fixtures with Large Contact Areas , 2000 .

[51]  Behrooz Arezoo,et al.  Static and dynamic models for predicting the effects of supports on machining flatness and roughness , 2002 .

[52]  Bing Li,et al.  Principle and Simulation of Fixture Configuration Design for Sheet Metal Assembly with Laser Welding, Part 2: Optimal Configuration Design with Genetic Algorithm , 2001 .

[53]  Shreyes N. Melkote,et al.  Iterative Fixture Layout and Clamping Force Optimization Using the Genetic Algorithm , 2000, Manufacturing Engineering.