摘要:

The manufacture and successful functioning of a product, be it large or small, involves an essential, and often complex, design sequence. This sequence contains many interacting factors including the performance requirements of the product, its size and shape; the number of articles to be made, and then the method of production; the cost, and the choice of the material from which the article is to be made.Considering these factors, it is obvious that on purely the criterion of properties, any one of a number of different materials could be used for most applications. Whilst the final choice of materials is almost invariably made on price, there are certain exceptions where either technology has advanced to such a stage that a reversal away from plastics materials would be detrimental, or where design criteria make plastics the only choice. Cost comparisons can and should be made at several stages in the overall production route; in terms of basic raw materials costs, conversion or fabrication costs, and the finishing operations.Note This paper was received at the Institution in October 1974.

DOI:10.1049/tpe.1975.0126

出版商:IEE    

年代:1975

数据来源: IET

DOI:10.1049/tpe.1975.0127

出版商:IEE    

年代:1975

数据来源: IET

摘要:

As operating costs continue to escalate, management must become more aware of the importance of increased productivity through increased efficiency. Scheduling by priority loading rules is one way of contributing towards the improved operation of the job shop.A computer simulation was used to study the performance variations of scheduling with eight different priority loading rules, of a job shop in an electroplating environment. The processing set-up of the shop was unique in that various plated finishes were obtained on various base-metals from a single system in which the processing tanks were physically arranged in a single line in series, and each base-metal-finish combination followed a specific pre-determined processing route.The plating job shop environment described, is shown in simplified flow chart form in Figure 1. The work to be processed was placed on racks and subsequently on to a movable bar before being transferred between the various processing tanks using automatically programmed travelling hoists. For our purposes, this system can process any one of the following base metal-finish combinations:Base metal finish(i) Zinc-brass (ii) Zinc-chrome (iii) Steel-brass (iv) Steel-chrome

DOI:10.1049/tpe.1975.0128

出版商:IEE    

年代:1975

数据来源: IET