摘要:

The paper gives a survey of problems that occur for the gripper system when handling systems are applied in small batches production. In order to solve these problems, a systematic approach is described in the paper. Solutions can be found, for example, in a universal gripper for a whole work-piece spectrum or using gripper changing systems. In order to develop a universal gripper, it is necessary to analyse significant areas on every work-piece type of the whole work-piece spectrum. If it is impossible to design a universal gripper, an automatic moulding gripper could be a possibility. Thus, moulding grippers were developed that use sensors and positioning drives. This paper presents new types of automatic moulding jaws that can be fixed on various grippers. The moulding jaws have been developed as a simple system for moulding purposes in comparison to moulding grippers with sensors and positioning drives. Those automatic moulding jaws will be described in detail. Experiments with moulding jaws were made by means of a special gripper test station. Results of the experiments will be presented as well as a future outlook on gripper technology

ISSN:0020-7543    

DOI:10.1080/00207548008919688

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The problems associated with chip removal during profile boring are highlighted and the effect of using a chip curler pad on the rake face of ISO triangular inserts investigated. The chip types obtained by varying the geometry of the chip curler pads are observed and the conditions under which a forward flowing continuous helical chip is obtained are determined. This chip type is of use when machining ‘through holes’ where the chip can flow along the bore in advance of the boring bar, through the hollow lathe spindle to be collected at the rear of the lathe. This method of chip collection simplifies chip removal problems in profile boring. Some illustrative examples of the effect of cutting conditions on chip radius and pitch of the chip helix are given and the chip form is shown to depend on the workpiece geometry in addition to the Cutting tool/chip curler geometry.

ISSN:0020-7543    

DOI:10.1080/00207548008919689

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

This article describes the roughness measurement of deformed surfaces using digital techniques, enabling a comprehensive assessment of roughness parameters in terms of density and slope distribution, Abbott curve, power spectrum, autocorrelation functions, etc. Short and long wavelengths, introduced on the surface by the plastic deformation process, influence its roughness parameters. These long wavelengths are not measured by the commercial roughness measuring methods due to their being rejected as waviness. A new method for determining the ‘n’ value of the material has been suggested. The deformation mechanism and surface roughness have been correlated with the help of power spectrum of the surface.

ISSN:0020-7543    

DOI:10.1080/00207548008919690

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

This article presents a simulation model that can be used to generate a two-dimensional surface profile which is statistically similar to the actual measured profile in both directions of asperities, amplitudes, and mean line of the profile. The model uses the Ra, AMS, and RMSS values to regenerate the actual surface profile.

ISSN:0020-7543    

DOI:10.1080/00207548008919691

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

This paper examines the causes of nonsteady-state behaviour in manual assembly lines and shows that several of them will result in transient behaviour which is equivalent to line ‘start-up’ conditions where interstage buffer stores are either all empty or all full of part finished items. These two conditions of & lsquo;empty start’ and & lsquo;full start’ are simulated in order to determine the magnitude of the initial deviation of operating behaviour from steady-state and the length of time required for the line to resume steady-state behaviour. Expressions are developed which relate transient magnitude and length to the number of stations in the line and the interstation buffer capacity. Lines whose mean station work times have been imbalanced are also simulated under similar nonsteady-state conditions. It is concluded that in certain conditions the performance of some lines subject to repeated disturbance can be improved by deliberate station work time unbalancing.

ISSN:0020-7543    

DOI:10.1080/00207548008919692

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The author develops a network of interlinked productivity indices and attempts thereby to propose a practical tool for studying the effect of Various factors on observed changes in man-year productivity. The system is devised to reflect the structure of possible working hours which consists of the following categories: non-working days and working days, days not worked and days worked, operated hours and omitted man-hours, and lost time and effective hours. Thus the index of man-year productivity is analysed by 19 indices which are interlinked indices of related factors. Among these factors, there are three groups of indices. The first group is a set of elemental indices which is composed of such indices as effective man-hours, operated man-hours, duty man-hours, days worked, working days, and rate of over-time work. The second group is a set of hierarchical indices of labour resource use such as rate of effective hours, ratio of operated hours to duty hours, ratio of duty man-hours to working man-days, and rate of working days. The third group is a set of indices of distribution of labour resources among products or sectors. The index number system necessarily includes some subcategories of labour productivity such as operated man-hour productivity, duty man-hour productivity and effective man-hour productivity. The theory and its application will be shown in detail,

ISSN:0020-7543    

DOI:10.1080/00207548008919693

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

This paper presents an evaluation of heterogeneous labour patterns in small, labour limited queueing systems. Three heterogeneous labour patterns, a homogeneous labour force and two labour assignment rules are examined. The experimental systems consist of three machine centres in parallel, each with its own queue. The arrival process is Poisson, and the queue priority rule is first-come-first-served. Each machine centre contains one machine, and the service times are exponentially distributed. The number of labourers is two. The experimental model is a GERTS QR stochastic network simulator. The evaluation focuses upon the relative merits of the various labourer efficiency patterns and offers an economic interpretation of the experimental results.

ISSN:0020-7543    

DOI:10.1080/00207548008919694

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

In this paper we present a two-stage production line with buffer storage where each stage may fail in two failure modes. We consider three repair policies; namely, (I) Policy I: failures are repaired with equal probabilities, (2) Policy II: priority of repair is assigned to failures of mode 1 over mode 2, and (3) Policy III: priority of repair is placed on mode 2. Productivity of system operating under policy I is higher than that of system operating under policies II and III.Also,Policy III shows a higher productivity than Policy II.

ISSN:0020-7543    

DOI:10.1080/00207548008919695

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

In this paper a start is made for a theory of production planning and control of the flow of goods. It deals with the analysis and optimization of the flow of goods in a network of stocks and production units, for which an integral control system IPSO ( = Initiating Production by Sales Orders) is used. It is shown that:

ISSN:0020-7543    

DOI:10.1080/00207548008919696

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

This paper considers the interaction of an order-level—lot-size model having uniform replenishing rate with the marketing policy involving mark-up of prices varying with capital intensity and turnover of finished product. Under two different policies considered in this paper, the optimum values of decision variables are obtained so that the profit for the system is maximized.

ISSN:0020-7543    

DOI:10.1080/00207548008919697

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor