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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1433-3015
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-3015
    Keywords: Computer-aided process planning ; Machining ; Metal cutting ; Optimisation ; Turning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper a model and the interactive program system MECCANO2 for multiple criteria selection of optimal machining conditions in multipass turning is presented. Optimisation is done for the most important machining conditions: cutting speed, feed and depth of cut, with respect to combinations of the criteria, minimum unit production cost, minimum unit production time and minimum number of passes. The user can specify values of model parameters, criterion weights and desired tool life. MECCANO2 provides graphical presentation of results which makes it very suitable for application in an educational environment.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1433-3015
    Keywords: Chip breaker ; 2D and 3D Chip flow ; Knowledge-base ; Machining ; Tool design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents details of a knowledge-based approach for designing effective grooved chip breakers for two- and three-dimensional chip flow, curl and breaking. The design criterion used in formulating this new approach is effective chip breaking at minimum power consumption. This work was aimed at achieving the optimum groove parameters and the best utilisation of groove profile under varying machining conditions. A systematic knowledge-pool was established from a series of well-designed machining experiments which form four knowledge databases (reference database, grooved chip breaker database, natural contact length database and 3D chip flow database). This paper shows how the chip breaker design parameters can be estimated for effective chip breaking at reduced power consumption. The basic tool design strategy presented in the paper also includes some guidelines, for cutting tool designers, highlighting the need for implementing a scientific approach for designing a chip breaker against the current practice of “try and see” methods.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-3015
    Keywords: Dimensioning ; Machine accuracy ; Manufacturability ; Manufacturing cost ; Tolerance optimisation ; Tolerancing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The Cartesian coordinate system used for the geometrical, dimensional and accuracy description of a part is critical for programming CNC machining and achieving the required tolerances. Datum surfaces, fixture design, workpiece positioning and orientation in the machine tool workspace are directly influenced by the system which is adopted. On the other hand, constraints imposed by the available machining axes accuracy capabilities (i.e. accuracy of the available machine tools for the particular job) and the always present minimum machining cost requirement cannot be readily incorporated into the relevant considerations. In mechanical design, dimensional chains are frequent and observation of the specified tolerances — in conjunction with the geometrical ones — guarantees the part functionality. Definition of the workpiece zero point and the Cartesian coordinate system for CNC machining and/or measurement (CMM) and tolerance transfer to this system of the functional tolerances under the constraints mentioned is, as the industrial practice has shown, a difficult, tedious, experience demanding and time consuming task. In the paper an approach which has been developed for a systematic handling of this important engineering problem is presented. It is shown that the proposed algorithm and its CAD implementation constitute efficient tools for the analysis of the possible part dimensioning solutions. The designation of that zero workpiece point (ZWP) and Cartesian coordinate system which provide for minimum machining accuracy cost and for acceptable tolerances lying well within the machine tool accuracy capabilities is thus achieved. The complete methodology is further demonstrated and discussed in a 2 1/2 D case study and appropriate conclusions are drawn.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1433-3015
    Keywords: Machinability data ; Multipass optimisation ; Sequential quadratic programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract One drawback of current machinability data systems is the inability to accommodate technological changes. Existing schemes to optimise machinability data are too specific and rigid. This paper describes the development of a methodology for a more effective selection of machinability data. The methodology incorporates various techniques, such as expert systems and mathematical programming. The unique feature of this system is the way machinability data are handled to arrive at the most suitable solution. The system accepts a wide range of data, from the very complete and specific to the very general. The more detailed and specific the data set is, the more credible the results will be. The machinability data in the data banks are easily updated and improved using feedback data from current shop floor production. The process of obtaining solutions from these banks is regarded as flexible optimisation. This paper reports on the optimisation methodology for multipass turning operations. Longitudinal turning, facing, taper turning and contour turning have been considered.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1433-3015
    Keywords: Dynamic control ; FMS cells ; Optimisation ; Production modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Flexible manufacturing systems (FMSs) are a relatively new technological and organisational approach to helping companies respond to real-time marketing conditions for their production. Under a proposal of the National Bureau of Standards the FMSs are subdivided into virtual manufacturing cells in a dynamic manner, on the basis of group technology. A method of dynamic optimisation for the design of manufacturing processes, capacity balancing and checking, and also production scheduling or rescheduling in virtual manufacturing cells is described. It can be used during real-time production control in FMSs. Bellman's method of dynamic programming is used for the optimisation of manufacturing process design and execution. The model of manufacturing processes optimisation has been built in accordance with assumptions of Bellman's method. This model consists of a synthesised network of alternative manufacturing processes, a description of its components and an appropriate formula of criterion function. It can be considered as a “production rule base” of an expert system.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1433-3015
    Keywords: Cell Control ; Cell Design ; Concurrent Engineering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a neural network based decision support system (DSS) for use in concurrently determining cell configuration, operation plans, and complexity requirements of cell control functions. Advanced simulators and neural network technology are used in developing the DSS. Simulation experiments were conducted with many possible combinations of design changes to generate training pairs for a neural network. Complexity of cell control functions required by each design option was assessed, based on operational requirements, and was used to train another neural net. Once both neural networks are properly trained, one network can be used to predict the cell design configuration given a set of desirable cell performance measures, while the other network can be used to identify complexity requirements of the cell control functions by using the output provided by the first network as input to the second neural net. An operation-driven cell design methodology was applied to sequentially predict requirements of both cell configuration and cell control functions from the trained neural networks. This innovative new design methodology was illustrated via a successful implementation exercise in acquiring a real automated manufacturing cell at industrial settings. The exercise proves that such a DSS serves well as an effective tool for cell designers and the management in determining appropriate cell configuration and cell control functions at the design stage.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1433-3015
    Keywords: Artificial intelligence ; CAD/CAM ; CAPP ; Expert systems ; Knowledge based systems ; Integrated production systems ; Intelligent manufacturing ; Process planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a review of knowledge-based expert systems for process planning and related methods and problems. It is based mainly on literature and partially on a questionnaire investigation carried out by the author. After a general presentation of process planning, the main problems are classified and the related methods and approaches for solving them are discussed. Finally, a list of fifty-two prototype systems is presented and their main characteristics are summarised in two tables.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1433-3015
    Keywords: Alternative approximate strategies ; Multipass turning ; “Rigorous” optimisation strategies ; Single pass turning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The development of constrained optimisation analyses and strategies for selecting optimum cutting conditions in multipass rough turning operations based on minimum time per component criterion is outlined and discussed. It is shown that a combination of theoretical economic trends of single and multipass turning as well as numerical search methods are needed to arrive at the optimum solution. Numerical case studies supported the developed solution strategies and demonstrated the economic superiority of multipass strategies over single pass. Alternative approximate multipass optimisation strategies involving equal depth of cut per pass, single pass optimisation strategies and limited search techniques have also been developed and compared with the “rigorous” optimisation strategies. The approximate strategies have been shown to be useful, preferably for “on-line” applications such as “canned cycles” on CNC machine controllers, but recourse to the “rigorous” multipass strategies should be regarded as the reference for use in assessing alternative approximate strategies or for CAM support usage.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1433-3015
    Keywords: Computer-aided fixture design (CAFXD) ; Concurrent engineering management (CEM) ; IDEF (ICAM definition)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Within the last decade, the manufacturing research community has addressed many of the micro issues of automating the fixture design process using computers. Most of this research has concentrated on the geometric and kinematic factors that determine the configuration of a computer-aided fixture design (CAFXD) system. However, before the implementation of any of the researched micro issues can be accomplished, a systematic approach to fixture planning and design must be recognised that considers the macro issues (process planning and fixture design) of the complete design to manufacturing process. In order to improve the effectiveness and implementation of researched micro issues in fixture design, a generic model of the functional activities can provide an understanding of the process and information exchanged between process planning and fixture design. This paper presents such a generic IDEF working model that promotes the functional integration of these two functions — developed from a systems perspective.
    Type of Medium: Electronic Resource
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