摘要:

The analysis and conception of metal cutting given in the paper not only makes it possible to formulate the contents and qualify methods of acquiring knowledge in metal cutting with a higher degree of accuracy, but indicates at the same time a sort of entrance into cybernetics, of which the important aspects are :

ISSN:0020-7543    

DOI:10.1080/00207547308929941

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Some important factors of female work are analysed, and the importance and use of knowledge about maximum muscular strength of women in theory and praxis of Ergonomics, Biomechanics is demonstrated. With the term of maximum isometric muscular strength of position isodynes are defined as curves which join points of application of forces within the arm reach and which indicate strengths of the same type and amount. Isodynes are used for complex describing the dynamo-metric structure of the arm reach. Some examples of isodyne-diagrams demonstrate their practical applicability for work study practitioners and designers of work places and layout.

ISSN:0020-7543    

DOI:10.1080/00207547308929942

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The influence of workpiece surface temperature, as also of the cutting velocity, depth of cut and feed, on tool life and surface roughness, in hot-machining, has been investigated, using Factorial Regression Analysis, and a mathematical relationship has been obtained. The equations have been tested for goodness of fit by the Chi-Square Test. Alignment charts have been constructed to evaluate surface roughness and tool life, dependent on other parameters.

ISSN:0020-7543    

DOI:10.1080/00207547308929943

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The problem of optimally locating any number of new facilities in relation to any number of existing facilities is considered where the minimax criterion is to be satisfied. Costs in the system are proportional to the Euclidean distances between all pairs of new facilities and all pairs of new and existing facilities. A new non-linear programming solution method is presented and three numerical examples are given with computation results.

ISSN:0020-7543    

DOI:10.1080/00207547308929944

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The shop scheduling problem with which this paper is concerned is to determine a sequence ofJjobs on each of theMmachines such that the schedule time is minimized. The machine ordering of each job is pre-specified but independent of those of other jobs. A branch-and-bound algorithm, using a powerful bounding procedure, has been developed for obtaining an optimal solution. An illustrative example is solved. Computational experience with this algorithm shows that it is practical in problems of moderate size. However, for larger problems, the algorithm can be applied without backtracking in which an optimal or near-optimal solution may be obtained. The quality of solutions obtained by the branch-and-bound algorithm without backtracking has been investigated. The optimal-producing algorithm is compared favourably with other published methods The number of nodes explored and the computational time are considered as bases for evaluation.

ISSN:0020-7543    

DOI:10.1080/00207547308929945

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A quasi-finite element model for the determination of steady-state thermal fields in a tool-chip-workpiece system is presented. The approach accounts for all the three modes of heat transmission. Only a few temperature measurements, at certain discrete points in the continuum, are needed as boundary conditions. The method is employed to determine the temperature distribution in an orthogonal metal cutting operation. The results agree with experimental measurements under similar cutting conditions

ISSN:0020-7543    

DOI:10.1080/00207547308929946

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A now method of producing thin-walled seamless metal belts is discussed. The method incorporates the principles of float-rolling (CBS rolling), whereby metal strip is pinched between a small diameter floating roll and two large diameter back-up rolls which rotate with different peripheral speeds. Whereas in conventional rolling reduction may be controlled by regulating the roll gap opening, in float-rolling reduction is insensitive to changes in roll gap opening and is controlled instead by varying the speed differential between the two back-up rolls. In this report, the relationships between reduction and roll speeds, roll gap opening, and strip tension are described, and some observations of rolling loads and torques are reported. Several problems associated with the production of belts by the float-rolling method are also discussed.

ISSN:0020-7543    

DOI:10.1080/00207547308929947

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A now method of producing thin-walled seamless metal belts is discussed. The method incorporates the principles of float-rolling (CBS rolling), whereby metal strip is pinched between a small diameter floating roll and two large diameter back-up rolls which rotate with different peripheral speeds. Whereas in conventional rolling reduction may be controlled by regulating the roll gap opening, in float-rolling reduction is insensitive to changes in roll gap opening and is controlled instead by varying the speed differential between the two back-up rolls. In this report, the relationships between reduction and roll speeds, roll gap opening, and strip tension are described, and some observations of rolling loads and torques are reported. Several problems associated with the production of belts by the float-rolling method are also discussed.

ISSN:0020-7543    

DOI:10.1080/00207547308929948

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A direct method for estimating the parameters of the learning curve time constant model from historical data is presented. Compared with present methods, an assumption on asymptotic performance is unnecessary, and it is much simpler to implement than least error squares curve fitting. An example shows that these advantages are obtained without serious penalties in accuracy

ISSN:0020-7543    

DOI:10.1080/00207547308929949

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207547308929951

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor