摘要:

Most current data on manual handling performance are in the form of single-factor studies using the criterion of maximum weight liftable and measuring its variation with experimental conditions. This does not always help the manager attempting to set safe handling limits as his/her application will involve many of the factors. A recent paper by Drury and Pfeil showed how the task-factors of height of lift and awkwardness of object could be combined with the age and sex of the materials handler to predict performance. This paper is an extension of these methods to incorporate more data on the effects of lifting height, introduce a more general measure of awkwardness and modify the model to cover extended periods of lifting rather than a single maximum exertion.

ISSN:0020-7543    

DOI:10.1080/00207547508943026

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The problem of the layout of multi-product lines is considered as an integral part of production system planning. The paper discusses the stages in production system planning and identifies five types of system. The layout of multi-product lines involves determining the number of stations in the line, the machine type at each station, and the station at which each operation is to be performed. The problem is described in the context of work flow and work load. A special case, the single machine case, is identified and some methods for its solution discussed. A procedure for solution of the general case is proposed, consisting of these stages: construction of a line with uni-directional flow; elimination of uneconomic work stations; and simulation of alternative line configurations. The method is illustrated by a case study.

ISSN:0020-7543    

DOI:10.1080/00207547508943027

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A discrete-flow, closed-loop conveyor system with multiple loading and unloading stations is considered. An inherent capability of such a system is that certain cyclic variations in the input and output flow rates can be accommodated through the storage feature of the closed loop. The system is reduced to an equivalent one-station system for which the balance of flow is described by a difference equation. The solution of this equation yields feasibility conditions as well as guidelines for conveyor design optimization and for conveyor operation. A numerical example solution for a three-station conveyor is included.

ISSN:0020-7543    

DOI:10.1080/00207547508943028

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A method is presented for forming machine cells while implementing group technology. Information derived from the route cards of the components is analysed and the situation is represented in the form of a graph whose vertices correspond to the machines and whose edges represent the relationships created between the machines by the components using them. For finding the cells a graph partitioning approach is suggested and developed. Results obtained from testing the method using actual data are also presented.

ISSN:0020-7543    

DOI:10.1080/00207547508943029

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Often coordination of items for replenishment purposes can lead to significant savings in the costs of replenishment. This article presents a reasonable procedure for determining the values of the various control variables of an (S, c, e) control system, namely the Order-up-to-levels, the can-order points and the must-order points. It is assumed that demand is compound Poisson and the replenishment lead time is of negligible duration. Comparison with the best independent control strategy indicates that substantial savings (averaging 15-9% over some 64 examples) are possible through coordination of replenishments.

ISSN:0020-7543    

DOI:10.1080/00207547508943030

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The effect on shop performance of granting customer requests for setting earlier clue dates on jobs already in process in the shop was investigated, via computer simulation, for a five-machine pure job shop. One-replicate, two-way classification (with interaction) and contrasts were used to examine the effect on various measures of shop performance of (1) four levels of mean interarrival time, A, and (2) five levels of the percentage of all jobs with CKEDD (customer requested earlier due date) status, T. Regression equations were developed for each performance measure in terms of the independent variables, A and T.

ISSN:0020-7543    

DOI:10.1080/00207547508943031

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This analysis studies the batch production of components by machining, using throw away tools. Engineering components are often manufactured in batches at fixed intervals of time. The aim is to consider the various machining, tooling, production and inventory costs in the context of an integrated model and determine the economic batch quantity and economic tool life.

ISSN:0020-7543    

DOI:10.1080/00207547508943032

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The mean temperature of commercially pure aluminium slabs, upquenched in a heat treatment bath and (down) quenched in water, was determined theoretically and experimentally ; analysis and experiment were found to be in close agreement. The same theoretical approach was then used to estimate the relative times for different specimens to absorb the same amounts of heat energy. The assumption that geometrically different specimens of the same degree of cold work require the same amount of specific heat energy input to effect recrystallization was made. Thence, with the aid of experimentally determined times for complete recrystallization of specimens of any given thickness, each with different amounts of prior cold work, the theory was employed to predict recrystallization times for Eipecimens of different thicknesses but with the same amounts of cold work. In this way, the times for recrystallization of any specimen, for given material and upquench and quench bath conditions, with any amount of cold work, were determined (given experimentally determined times for recrystallization of specimens at the various amounts of cold work). Again analysis and experiment were found to agree closely.

ISSN:0020-7543    

DOI:10.1080/00207547508943033

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Slug, die and process parameters largely determine the load requirements when forging any given part. An earlier report (Balogun 1974) has indicated the effects of flash dimensions on deformation forces during cavity press forging of round mild steel slugs.

ISSN:0020-7543    

DOI:10.1080/00207547508943034

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207547508943035

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor