摘要:

With the rapid developments taking place in the electrical and electronic industries, soft magnetic materials are finding increasing application. Degradation of machined surfaces due to the mechanisms of surface formation when machining under geometrically defined cutting conditions lead to a corresponding deterioration in the magnetic properties of soft magnetic nickel-iron alloys. Graphical simulation techniques have been applied in order to study the interactive mechanics associated with the single point machining operation. Both the outcome of this simulation as well as the conclusions of experimental investigations into the milling of the soft magnetic nickel-iron alloy MUMETALL are the subject of this paper. The influence of machining on the topographical, the mechanical/ physical and the metallurgical properties of the surface and subsurface layer for the face milling operation using tungsten carbide cutting tools is discussed.

ISSN:0884-2558    

DOI:10.1080/10426918608953161

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0884-2558    

DOI:10.1080/10426918608953162

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The physio-chemical characteristics of aluminium are cause of considerable difficulties in the welding of this material. Even if the technological level reached with traditional technologies for some types of alloy makes it possible to obtain joints with structures meeting or exceeding required standards, the high amount of heat involved and the high coefficient of expansion of the material are- cause of considerable distortions in the manufacturing process.The greater the concentration of energy (with consequent high work speeds), the greater the geometrical distortion of the workpiece. The high level of specific power and the restricted area involved put laser technology in the position of being one of the most interesting technologies for the welding of aluminium.In the present research, the aim has been to approach the welding of aluminium using laser beam technology, verifying only the feasibility of the joint from metallurgic and mechanical points of view. Subsequently, in relation to the results, this research may be extended to the evaluation of the distortions induced by the process.

ISSN:0884-2558    

DOI:10.1080/10426918608953163

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Thin rib machining of electronic components or airframe structures can benefit from high speed machining for burr free cutting, improved surface quality and increased metal removal rate. It is suggested that the use of a magnetic bearing spindle can not only successfully provide the benefits of high speed machining but, more importantly, minimize tool path errors. In this paper the various sources of tool path error are discussed as functions of machine tool positioning errors and cutting force errors which are characterized as static, dynamic and stochastic. The operation of high speed magnetic bearing spindles is described and a control scheme whereby the spindle may be translated and tilted for minimizing tool path errors is discussed. This overall research activity is a cooperative effort between the University of Maryland, Cincinnati Milacron, Magnetic Bearings, Inc., The Uestinghouse Corporation, and The National Bureau of Standards.

ISSN:0884-2558    

DOI:10.1080/10426918608953164

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The finite element formulation for deformation of porous materials including compressibility of the material and the effect of temperature was developed and applied to the problem of plane-strain compression of sintered iron-powder bars. The formulation employed a phenomenological approach for the deformation analysis. A simple linear relationship between the thermal conductivities of the powdered metal and the base metal was derived and used as a first approximation for temperature calculations. The computed results are compared with experimental values in terms of macroscopic densification and forging pressures. Also, the predicted relative density distribution was compared with the experimental hardness distribution. The results show that the finite element analysis simulates the compression process well and predicts the sites of fracture during deformation.

ISSN:0884-2558    

DOI:10.1080/10426918608953165

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

In this investigation, a new concept of surface interfaces in engineering systems is proposed. Various surface interfaces have been examined in order to reveal the physical meaning and importance of combining elements. Two convenient and meaningful variables, exergy and entropy, can be used for modelling such systems. The statistical nature of these variables prove that the previous investigations into the surfaces participating in surface interfaces may contribute general solutions to this subject.

ISSN:0884-2558    

DOI:10.1080/10426918608953166

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Great advances have been made in laser technology in recent years. Near net shape manufacturing technology, on the other hand, has attracted attention to the products of expensive and difficult-to-machine materials. It is in this context Laser Rheology Processing (LRP) is proposed, where lasers as a fabrication tool and rheological powder as input are used. In this paper, merits, feasibility, results of a fundamental experiment, and conceptual design of an LRP machine are discussed.

ISSN:0884-2558    

DOI:10.1080/10426918608953167

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor