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  • 1
    Electronic Resource
    Electronic Resource
    Process sequence optimization based on a new cost–tolerance model (1998)
    Springer
    Journal of intelligent manufacturing 9 (1998), S. 29-37 
    Details
    ISSN: 1572-8145
    Keywords: Extended spline model ; process sequence ; cost relationship ; stock allowance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Identification of the optimal production sequence and allocation of machining tolerance are important activities in process planning for reducing production cost. This paper presents an approach that is capable of determining the optimal production sequence and its optimal process tolerance to achieve the minimum production costs. A new mathematical model, representing the cost–tolerance relationships and showing significant accuracy improvement over existing models, is introduced to allocate process tolerance. Stock allowance constraints on the selected switching tolerance are also considered to yield practical solutions. A prototype system for hole-making components is used to verify and evaluate the effectiveness of the new approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008895224256
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysing the natural resting aspect of a component for automated assembly using the energy envelope method (1996)
    Springer
    The international journal of advanced manufacturing technology 12 (1996), S. 132-136 
    Details
    ISSN: 1433-3015
    Keywords: Automated assembly ; Natural resting aspect ; Vibratory-bowl
    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 new approach for analysing the natural resting behaviour of a non-rotational component. The method employs the energy envelope concept to analyse the natural resting of a component. The resultant curves for all the prisms agree well with Boothroyd's theoretical curve and Boothroyd's experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178953
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Concurrent tolerance charting for component and assembly using “modified tree” approach (1997)
    Springer
    The international journal of advanced manufacturing technology 13 (1997), S. 729-737 
    Details
    ISSN: 1433-3015
    Keywords: Concurrent engineering ; Stack analysis ; Tolerance charting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The interaction between components in an assembly plays a major role in the performance and reliability of the assembly. However, in conventional design, the dimensions and tolerances of components are usually assigned intuitively to satisfy design constraints. Tolerance analysis is then performed to determine the critical tolerance accumulation that results from the assembly. The tolerances are then modified so that the interaction requirements are satisfied. This approach relies on the experience of the designers and the results may not be an optimum. This paper presents a direct method to determine the working dimensions and tolerances of components that allows control of the assembly interaction. The model is easy to construct and it provides a clear picture of the entire process and assembly links. Using the model, a set of linear equations is formulated directly based on the design constraints and interaction requirements. With appropriate constraints derived in terms of the process capabilities, the desired working dimensions and tolerances can be determined using LINDO, software for solving the linear programming problem. This approach allows the working dimensions and tolerances of all components in an assembly to be determined concurrently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179073
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An analysis of the resting probabilities of an object with curved surfaces (1996)
    Springer
    The international journal of advanced manufacturing technology 12 (1996), S. 366-369 
    Details
    ISSN: 1433-3015
    Keywords: Assembly ; Curved surfaces ; Rest-position
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The efficiency of a part feeding and orienting device such as a vibratory bowl is largely governed by some fore-knowledge of the probabilities of the various feasible natural resting aspects of the part. Classical algorithms, such as the energy barrier method, have been proposed to determine these probabilities. In this paper, the authors propose an alternative hypothesis based on the concept of a centroid solid angle. The hypothesis makes use of the geometry of the part to predict the probabilities of its feasible natural resting aspects. In particular, this paper focuses on the case of parts with curved surfaces, such as cylinders. The predictions of the hypothesis were compared with the empirical results of the authors and those obtained by Boothroyd and associates. In both cases, the theoretical values were found to have a mean deviation of about 2.6% compared to the authors' empirical results, and about 1.6% compared to Boothroyd's.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179812
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Optimising robot workcell layout (1996)
    Springer
    The international journal of advanced manufacturing technology 12 (1996), S. 377-385 
    Details
    ISSN: 1433-3015
    Keywords: Optimisation ; Robot workcell layout ; Spatial representation
    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 describes a heuristic algorithm for optimising the layout of a robot workcell. The algorithm attempts to minimise the total path of travel of a robot arm for a given sequence of operations by determining the relative positions and orientations of the stations in the workcell. A unique spatial representation system is used to model the shapes and orientation of the stations in the workcell. The representation is very flexible and can closely represent the shapes of many common types of peripheral machine encountered in a robot workcell. The algorithm has been implemented on an IBM compatible PC and the results obtained are promising.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179814
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear optimisation in tolerance charts — A study of objective functions (1998)
    Springer
    The international journal of advanced manufacturing technology 14 (1998), S. 423-427 
    Details
    ISSN: 1433-3015
    Keywords: Nonlinear ; Objective function ; Optimisation ; Tolerance charts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract One of the main objectives in tolerance charting is to determine the working dimensions and tolerances at the lowest cost without violating the blueprint specifications. It is with this objective in mind that the authors present a comprehensive study of the effect of the choice of an objective function on the final manufacturing cost. Optimisation of the objective functions has been done using PROFORT (nonlinear optimisation). The paper deals with a single example, solved using two linear and a nonlinear objective function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304621
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The Noded graph approach to stack analysis (1998)
    Springer
    The international journal of advanced manufacturing technology 14 (1998), S. 343-349 
    Details
    ISSN: 1433-3015
    Keywords: Geometric dimensioning and tolerancing ; Graphical model ; Stack analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tolerance chart is a graphical method for representing the manufacturing dimensions of a workpiece or assembly, at all stages of its manufacture. The chart provides an intermediate control system of checks and balances to ensure that processing dimensions and tolerances will meet those specified on the print. Tolerance charts are generally used in studying the dimensional problems on individual parts. However, they have proved tedious in their application to assemblies. This paper presents a simple and systematic approach to the process of tolerance stack analysis. The “Noded graph” model is constructed, representing the given and the unknown dimensions. Links are then established, using the model, which help to formulate the stack path of interest into a linear equation. The equation is used to complete the tolerance stack analysis module. This will be explained using a variety of geometric dimensioning and tolerancing examples. In addition, it is simple and hence easy to practise and very logical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178913
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The apparent path tracing approach to tolerance charting (1998)
    Springer
    The international journal of advanced manufacturing technology 14 (1998), S. 580-587 
    Details
    ISSN: 1433-3015
    Keywords: Linear optimisation software ; Tolerance charting
    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 simple and straightforward, expeditious and accurate approach towards tolerance charting. Its simplicity in logic and approach allows a newcomer in this field to quickly develop expertise in process tolerance charting. The approach is used in conjunction with linear optimisation software, LINDO, to determine the optimal dimensions and tolerances for the part that is being processed. An example is given to illustrate the approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301702
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Optimum Tolerance Allocation in Assembly (1999)
    Springer
    The international journal of advanced manufacturing technology 15 (1999), S. 660-665 
    Details
    ISSN: 1433-3015
    Keywords: Key words. Assembly requirement; Dimensioning; Tolerancing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Dimensioning and tolerancing are both important phases of product design. Although dimensions can usually be assigned based on design constraints and aestheticism without much difficulty, tolerancing is often a major problem to designers. Traditionally, tolerances are assigned intuitively followed by an analysis to check for any violation of the assembly requirements. Based on the analysis results, modifications are made manually by a "trial and error" method. This method relies on the experience of the designers and the results may not be optimal. This paper presents a new approach to optimum tolerancing of components in an assembly such that all interaction requirements are met. The requirements may be for unilateral tolerance for control of clearance and interference or they may be for bilateral tolerance control. A model showing the relationship between components is constructed directly from the design. Using the model, coupled with a unique algorithm, a set of linear equations is formulated based on the design constraints and assembly requirements. The linear equations are then solved to determine the optimum tolerances of the assembly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050116
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Ductile Regime Finish Machining - A Review (2000)
    Springer
    The international journal of advanced manufacturing technology 16 (2000), S. 547-550 
    Details
    ISSN: 1433-3015
    Keywords: Keywords:Brittle; Cleavage plane; Ductile regime; Grinding; Slip plane; Turning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Many of today's products require high precision and operate in extreme environments. To meet these demands, new types of high-performance materials and machining techniques have been developed. The use of these machining techniques , enables these materials to achieve nanometric tolerances. Ceramics are one group of such materials, which can be used in high-performance applications because of their high stiffness, dimensional and temperature stability, and resistance to chemical environments. The brittleness of these materials poses problems during machining, but the demand for precision parts made of these materials are increasing at a fast rate. Experiments have shown that plastic flow can occur in ceramic materials, so they can be ductile machined. However, much needs to be determined in respect of the cutting conditions to enable this ductile behaviour to be successfully maintained throughout the machining processes such as turning or grinding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700070043
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    Paper (German National Licenses)
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