摘要:

Research is yet to be clone on the direct economy of the electro-discharge machining process which is a vital criterion for the users of the machine. In this paper an expression for contribution rate, as a function of process variables, which is a direct indicator to measure the economic objectives of the process for a production system is derived and a methodology forestimating the process and hence the objective function with respect to the process variables is cited.

ISSN:0020-7543    

DOI:10.1080/00207548108956677

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Numerically Controlled (NO) machines have in recent years revolutionized the production process, but their productivity may yet be increased by the application of new theory to the controlling computer software. This paper describes the improvement in productivity of a class of NC punch presses which operate from either an off-line computer prepared tape or under direct numerical control. The problem of tool selection and table motion during the manufacture of a product by punching an array of holes in a metal sheet with a sequence of various size and shape tools is formulated as a travelling salesman problem (TSP). Two TSP heuristics, one old and one proposed by the authors, are employed in a comparison test with the.NC press manufacturer's heuristic. Both TSP heuristics generally outperform the manufacturer's heuristic by 10% or more.

ISSN:0020-7543    

DOI:10.1080/00207548108956678

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

An experimental investigation of operating strategies for a computer-controlled flexible manufacturing system is reported. The system is a real one, consisting of nine machines, an inspection station and a centralized queueing area—all interconnected by an automatic material-handling mechanism. The operating strategies considered involve policies for loading (allocating operations and tooling to machines) and real-time flow control. A detailed simulation was employed to test alternatives. The results are different from those of classical job shop scheduling studies, showing the dependence of system performance on the loading and control strategies chosen to operate this flexible manufacturing system. Loading and control methods are defined that significantly improve the system's production rate when compared to methods which were previously applied to the system. Finally, some conclusions are presented concerning the control of these automated systems.

ISSN:0020-7543    

DOI:10.1080/00207548108956679

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This work deals with an investigation of the influence of various additives to a base slock cutting oil in order to develop a better oil for deep-hole machining.

ISSN:0020-7543    

DOI:10.1080/00207548108956680

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This work is the result of an investigation undertaken by the author during his stay in the U.S.S.R. The elaborated algorithm of electrolysis process control proved to be effective and the calculating procedure uncomplicated.

ISSN:0020-7543    

DOI:10.1080/00207548108956681

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper introduces a network flow method for manpower scheduling and resource allocation. The network formulation of the problem permits the development of an algorithm that determines the minimal flow of resources through the network. The method presented here corresponds to the Simplex method, for in both methods the value of the objective function is optimized while the capacity limitations are preserved. The procedure proposed here, however, uses a more economical problem representation and is computationally more efficient. The efficacy of the minimal flow algorithm and its use is illustrated for a production system but the applicability of the procedure is sufficiently broad for it to work in other problem situations just as well.

ISSN:0020-7543    

DOI:10.1080/00207548108956682

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper presents four heuristic algorithms for handling orders in automatic warehousing systems. It is assumed that the orders will be handled by the use of an automatic storage and retrieval machine (S/R machine). The algorithms select, the orders that will be hand led in one tour in order to minimize the total distance travelled by the S7sol;R machine within the warehouse system. Computer programs are developed for the four algorithms and the optimal tours are found by using the travelling salesman algorithm. Optimal or near optimal solutions for the handling problem are found.

ISSN:0020-7543    

DOI:10.1080/00207548108956683

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The paper describes a design analysis for the manufacture of a Step and Repeat Camera. The present manufacturing operations and specification tolerances were analysed using a simple statistical model and the specification for the camera derived. An indication of the rejection rate of printed circuit boards can be computed from the specification and manufacturing capabilities.

ISSN:0020-7543    

DOI:10.1080/00207548108956684

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

In Part fl of this paper, surface finish predictive equations for fine turning developed for both TiC coated and uncoated throwaway cutting tools are further discussed.

ISSN:0020-7543    

DOI:10.1080/00207548108956685

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper outlines further experimental development of mathematical models for predicting RMS surface finish in fine turning operation using TiC coated and cemented tungsten carbide throwaway cutting tools. The five independent variables included are: cutting speed, feed, depth of cut, time of cut of tool, nose radius. Using these five variables at different levels an experimental approach, predictive models for tungsten carbide and titanium coated tungsten carbide tools were developed. A sixth variable, 'the type of cutting tool,' was used to develop a single model for both the TiC coated and cemented carbide cutting tools. AIS1 4140 steel was used as workpiece specimen in the experimental work. Stepwise regression analysis was used in developing the models.

ISSN:0020-7543    

DOI:10.1080/00207548108956686

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor