摘要:

This paper explores the economic conditions under which single-model assembly lines are operated in a batch mode (through intermittent manufacture at higher production rates) rather than by the traditional method of continuous production at the demand rate. A model for optimizing the ‘cycle time, station number’ combination is developed through consideration of five factors: the learning, inventory, setup, balancing and facility costs. Economic justification for operating in a batch mode was found for total demands ranging from 20 to 4000 assembled products which is expected to include a sizable percentage of the total products manufactured in industralised countries each year. Greatest savings occur for total demands in the order of 1000 products.

ISSN:0020-7543    

DOI:10.1080/00207548808947958

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

In this paper, a part-feature recognition system for the conversion of a CAD language to a CAM language is developed. The parts of interest are rotational without deviation. The recognized part information is posted into a part-definition data structure, which many manufacturing functions such as computer-aided process planning, group technology coding, NC program generation, and inspection can access to. A part-feature recognition algorithm, the ‘intelligente’ of the system, is discussed in great detail. Finally, an example is evaluated to demonstrate the success of the system.

ISSN:0020-7543    

DOI:10.1080/00207548808947959

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Single-sampling-attribute plans which make the producer's risk less than or equal to α (that is, ⩽ α) and the consumer's risk less than or equal to β (that is, ⩽β) are called exact sampling plans. In using exact sampling plans, however, cases often arise in which large sample size is needlessly sought. A minimax criterion which relaxes the conditions on the risks for reducing the sample size was. introduced by Fujino and Okuno. This paper presents a design procedure for relaxing the conditions on the risks by the membership functions used in fuzzy methodologies. The proposed procedure is general because it includes sampling plans based on the minimax criterion and exact sampling plans in the special. cases.

ISSN:0020-7543    

DOI:10.1080/00207548808947960

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The problem of scheduling customer orders in the management of a large multi-product warehouse is addressed under realistic assumptions including rapidly changing data, uncertainties and unforeseen events. Simple flexible solution strategies are sought, in the sense that the scheduling problem should not be solved again from the beginning every time new information becomes available. Among the solution strategies, one is based on a few statistical assumptions about the random variables involved in the process: it exploits a stochastic version of the well-known duality principle for nonlinear programming and yields a number of interesting features.

ISSN:0020-7543    

DOI:10.1080/00207548808947961

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

We present a three-stage procedure for configuring machines into manufacturing cells, and assigning the cells to process specific sets of jobs. First, operations are assigned, with the objective of minimizing the deviation between available capacity and the workload assigned to each machine. We then extended King's algorithm to group machines based on similarities of operations. Finally a direct-search algorithm for defining the composition of manufacturing ceils is offered. A comprehensive example is also included.

ISSN:0020-7543    

DOI:10.1080/00207548808947962

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

This paper presents a simple look-ahead rule for scheduling two or more parallel semi-automatic machines sharing the same server. The rule increases machine utilization in situations where machines and servers are highly utilized.

ISSN:0020-7543    

DOI:10.1080/00207548808947963

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

An experimental investigation has been carried out into the machining of polymers which exhibit both anisotropic and normal stress sensitive characteristics. The cutting mechanism is analysed using a modified shear angle relationship based on the mechanical properties of the chosen polymers and the minimum energy criterion. From cutting tests, the material shear stress is estimated and hence cutting forces calculated. The presence of a critical rake angle at which the normal force equals zero has been confirmed. The value of critical rake angle can be estimated from force predictions. The coefficient of friction for polymers was found to decrease with increasing the normal force on the tool rake face.

ISSN:0020-7543    

DOI:10.1080/00207548808947964

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

In NC-lathe operation, the spindle speed is programmed for the spindle revolutions per minute or the unit length per minute for the constant circumferential cutting speed. Additionally, the tool feed can be coded in terms of the unit length per minute or per revolution. This paper describes the derivation of formulas which enable calculation of tool movement time when the real tool feederate with velocity unit varies during linear and/or circular interpolation with the most widely used cutting conditions, that is, cutting speed in terms of the length unit per minute and feed in terms of length unit per spindle revolution.

ISSN:0020-7543    

DOI:10.1080/00207548808947965

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

This paper reports the results of a survey of early implementators of the just-in-time (JIT) philosophy in the United States with particular emphasis on the identification of implementation problems and operating problems. There were 39 respondents to the survey who were in the process of implementing JIT. Five classes of implementation problems and eight classes of operating problems were identified.

ISSN:0020-7543    

DOI:10.1080/00207548808947966

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207548808947968

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor