File Name: machining fixture locating and clamping position optimization using genetic algorithms .zip
The purpose of this paper is to propose a general model for locating and clamping workpieces of complex geometry with two skewed holes under multiple constraints.
Fixture layout design is concerned with immobilization of the workpiece engine mount bracket during machining such that the workpiece elastic deformation is reduced. The fixture holds the workpiece through the positioning of fixturing elements that causes the workpiece elastic deformation, in turn, leads to the form and dimensional errors and increased machining cost. The fixture layout has the major impact on the machining accuracy and is the function of the fixturing position.
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Fixture plays an important part in constraining excessive sheet metal part deformation at machining, assembly, and measuring stages during the whole manufacturing process. However, it is still a difficult and nontrivial task to design and optimize sheet metal fixture locating layout at present because there is always no direct and explicit expression describing sheet metal fixture locating layout and responding deformation. To that end, an RBF neural network prediction model is proposed in this paper to assist design and optimization of sheet metal fixture locating layout. The RBF neural network model is constructed by training data set selected by uniform sampling and finite element simulation analysis. Finally, a case study is conducted to verify the proposed method.
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In machining fixtures, minimizing workpiece deformation due to clamping and cutting forces is essential to maintain the machining accuracy. This can be achieved by selecting the optimal location of fixturing elements such as locators and clamps. Many researches in the past decades described more efficient algorithms for fixture layout optimization. In this paper, artificial neural networks ANN -based algorithm with design of experiments DOE is proposed to design an optimum fixture layout in order to reduce the maximum elastic deformation of the workpiece caused by the clamping and machining forces acting on the workpiece while machining. Finite element method FEM is used to find out the maximum deformation of the workpiece for various fixture layouts.
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An automated flexible fixture system for mass customisation. Illidge; G. The need for mass customisation is growing as customer demand for customised products increases. Mass customisation is the production of custom products at mass-produced rates.
Genetic algorithm based deformation control and clamping force optimisation of workpiece fixture system. To cite this article: K. Paulraj Genetic algorithm based deformation control and clamping force optimisation of workpiece fixture system, International Journal of Production Research, , , DOI: Siva Kumara and G. In re-engineering mass production industry, design and production of components are frequently changed according to the customer needs within a very short span of time. This leads to rising difficulty in maintaining the accuracy of every finished component.
Fathianathan, M. April 2, September ; 7 3 : — Integrated product and process design involves a dynamic environment where various design changes are made when the requirements of the different domains are not sufficiently met. Dealing with changes is a tedious and cumbersome process. To deal with design changes automatically, this paper presents the development of an adaptive fixture design system based on an evolutionary search algorithm. The system senses a change made to the workpiece model and automatically deals with the change.
Fixture plays a significant role in determining the sheet metal part SMP spatial position and restraining its excessive deformation in many manufacturing operations. However, it is still a difficult task to design and optimize SMP fixture locating layout at present because there exist multiple conflicting objectives and excessive computational cost of finite element analysis FEA during the optimization process. To this end, a new multiobjective optimization method for SMP fixture locating layout is proposed in this paper based on the support vector regression SVR surrogate model and the elitist nondominated sorting genetic algorithm NSGA-II. And the fixture locating layout is treated as design variables, while the overall deformation and maximum deformation of SMP under external forces are as the multiple objective functions. Second, two SVR prediction models corresponding to the multiple objectives are established by learning from the limited training samples and are integrated as the multiobjective optimization surrogate model. Finally, a multiobjective optimization for fixture locating layout of an aircraft fuselage skin case is conducted to illustrate and verify the proposed method. Sheet metal part SMP , having the advantages of high strength, light weight, and fluent geometric modeling, widely exists in various fields of aerospace, vehicle, and so on [ 1 , 2 ].
There is a wide range of machine tools capable of performing this operation for all variety of metal projects, many of which are easily and conveniently availe from used industrial machinery auctions. Basic Rules for Locating Jig and Fixture. Meaning of Jig: Jig may be described as a plate, or metal box,
Barichard and J. Bergounioux and -.