摘要:

The contributions of a number of investigators in the United States and abroad have provided more fundamental understanding of the process of precision removal of anode material by electrolytic dissolution at high current densities, known industrially as electrochemical machining. However, much remains to be done to achieve complete knowledge and corresponding control of the process. This will involve consideration of electrochemical, heat and mass transfer relationships and the complex interaction of variables affecting conditions in the electrode gap such as current density, temperature, pressure and viscosity.

ISSN:0020-7543    

DOI:10.1080/00207546508919966

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

This paper uses the statistical tool of analysis of variance to look at the recommended operating values for chemical machining.

ISSN:0020-7543    

DOI:10.1080/00207546508919967

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

The authors review the assumptions and approximations made in previous thermodynamic analyses of machining and propose a numerical method of solution based upon finite difference forms of the differential equations of heat flow. Generalized equations are established for the chip, workpiece and tool as separate entities and these are then combined, via the conditions at the interfaces, into equations valid throughout the system as a whole. A self-determination principle is used to establish the boundary locations and the temperature distribution is found by relaxation methods.

ISSN:0020-7543    

DOI:10.1080/00207546508919968

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

Two experiments were conducted to explore some possible causes of stress experienced by semi-automatic arc welders. In the first experiment the effect of a restricted field of vision was investigated. The subject had to track along a 14 s.w.g. wire with a specially designed stylus. His vision of the wire was restricted by cardboard screens. It was found that limiting the area of vision caused an increase in the number of times the subject deviated from the required track.

ISSN:0020-7543    

DOI:10.1080/00207546508919969

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

A model of a particular type of conveyor-based single stage working has been developed and programmed for a digital computer. The model has been used to simulate “mechanical effect” (i.e. the effect of specific settings of feed rate and tolerance time) on an operator's natural unpaced performance. It is shown that operator response to pacing can be dimensioned more properly by reference to “mechanical effect” measures. Also, with assumptions of operator response to pacing the model can be used to predict output, misses and delay for selected conveyor settings.

ISSN:0020-7543    

DOI:10.1080/00207546508919970

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

A method is proposed which provides the force for a given axi-symmetric plastic deformation process. The method is based on equilibrium considerations of the stress system arising from a kinematically admissible system of velocity discontinuities. The circumferential stress is denned by the Haar and von Kármán assumption. This assumed pattern of velocity discontinuities is adjusted to give a minimum value of applied force. The method is considered in the context of the extrusion process and is shown to agree with an alternative upper bound solution, both solutions being in reasonable agreement with experimental results. By a comprehensive evaluation of the extrusion loads for various reductions, frictional conditions and cone angles, the method may be used to predict the formation of dead zones. Experimental results for the extrusion through lubricated 90° dies show reasonable agreement with such predictions.

ISSN:0020-7543    

DOI:10.1080/00207546508919971

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

Process variability has been used to assess the macro-geometric behaviour of materials in finish-turning. Leaded En 1A and non-leaded CS1114 free-cutting steels were compared with respect to dimensional variations in the machined diameters. The two materials differed significantly in process variability, the leaded steel causing less variability. Dimensional variation was also affected by the microstructure of the materials; it increased with the grain size of the matrix.

ISSN:0020-7543    

DOI:10.1080/00207546508919972

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor