Search results

1 – 10 of 302
Article
Publication date: 1 December 1996

Brian W. Rooks

Presents a case study of Oilgear Towler, supplier of one of the most sophisticated electro‐hydraulic control systems for a Eumuco Hasenclever radial forging machine. One of the…

Abstract

Presents a case study of Oilgear Towler, supplier of one of the most sophisticated electro‐hydraulic control systems for a Eumuco Hasenclever radial forging machine. One of the key elements of the system is the control of two synchronized manipulators and four forging rams.

Details

Industrial Robot: An International Journal, vol. 23 no. 6
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 1 May 1932

W.A. Thain

AMONG the aeroengine and aircraft parts manufactured by the drop‐forging and drop‐stamping processes are airscrew hubs and shafts, crankshafts, connecting rods, valves…

Abstract

AMONG the aeroengine and aircraft parts manufactured by the drop‐forging and drop‐stamping processes are airscrew hubs and shafts, crankshafts, connecting rods, valves, valve‐rockers, camshafts, dashpot pistons, spar brackets, and windmill propellers. In addition a large number of smaller and less important parts are drop stamped to practically finished dimensions.

Details

Aircraft Engineering and Aerospace Technology, vol. 4 no. 5
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 March 1955

THE conference opened with the paper by Mr Woodward‐Nutt, which, together with the other papers, is summarized below. After the first session the conference luncheon was held, and…

Abstract

THE conference opened with the paper by Mr Woodward‐Nutt, which, together with the other papers, is summarized below. After the first session the conference luncheon was held, and the principal speakers were the Mayor of Southampton, Alderman R. E. Edmunds, who welcomed the conference to Southampton, and Sir Edward Boyle, Parliamentary Secretary to the Ministry of Supply, who referred to current concern about delays in fighter deliveries. He said that there had in the last year been setbacks, but the delays were due to difficulties of development rather than of production. The comparison which was often made of deliveries during the last war was not fair, because the aircraft in question had then been developed. The Spitfire took five years to develop, and this did not compare so unfavourably with the development of the Hunter, when the increase in complexity and the aerodynamic difficulties of the transonic region were considered. Flight trials were the only indication of many of these troubles, and modifications were necessary after the tests. It was for this reason that the Ministry had adopted the policy of ordering up to twenty development aircraft, with the intention that by the time the last one had been built it would be in a form suitable for the production version.

Details

Aircraft Engineering and Aerospace Technology, vol. 27 no. 3
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 April 1957

TITANIUM is a new metal but not a rare one. It is new in the sense that although its existence has been known since 1791, it is only within the last decade that it has become a…

Abstract

TITANIUM is a new metal but not a rare one. It is new in the sense that although its existence has been known since 1791, it is only within the last decade that it has become a product of metallurgical industry. It was not until 1925 that it was made by van Arkel, on a small experimental scale, in a state of sufficient purity for an assessment to be made of its properties and of its potential value as an engineering material. So far, it has not been possible to translate into a large scale and economically attractive extraction process the van Arkel technique and it was, in fact, left to W. J. Kroll to devise the first industrial process for the production of ductile titanium, which he described in 1940.

Details

Aircraft Engineering and Aerospace Technology, vol. 29 no. 4
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 June 1954

THROUGH the courtesy of the American Society of Mechanical Engineers we are enabled to publish in this issue two papers on press‐forging which were read at a meeting of the…

Abstract

THROUGH the courtesy of the American Society of Mechanical Engineers we are enabled to publish in this issue two papers on press‐forging which were read at a meeting of the Society eleven months ago.

Details

Aircraft Engineering and Aerospace Technology, vol. 26 no. 6
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 November 1981

W.B. Heginbotham

Industrial robots bear little resemblance to the science fiction concept of futuristic machines — they are little more than machine tools except that their prime function is…

Abstract

Industrial robots bear little resemblance to the science fiction concept of futuristic machines — they are little more than machine tools except that their prime function is handling not making components. Being designed to replace a human operator, many of the machines currently available are somewhat similar in scale to a human being although their continuous weight lifting abilities can be much in excess of a human. They generally have one manipulating arm and there are three classical types of robot architecture:

Details

Industrial Management & Data Systems, vol. 81 no. 11/12
Type: Research Article
ISSN: 0263-5577

Article
Publication date: 1 August 1934

N.F. Budgen

ALUMINIUM in various forms is used very considerably in the aeronautical industry—even so far back as the end of the war it was computed that in the year 1918 the allied…

Abstract

ALUMINIUM in various forms is used very considerably in the aeronautical industry—even so far back as the end of the war it was computed that in the year 1918 the allied governments employed about 90,000 tons of aluminium and its alloys in aero construction. And it must not be overlooked that it is largely due to the special properties of these materials that the present amazing development of aircraft has become possible.

Details

Aircraft Engineering and Aerospace Technology, vol. 6 no. 8
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 January 2006

J.T. Hong, S.R. Lee, C.H. Park and D.Y. Yang

In the finite element analysis of a hot forging process, it is difficult to design an optimal preform because of highly nonlinear characteristics of design variables. In this…

Abstract

Purpose

In the finite element analysis of a hot forging process, it is difficult to design an optimal preform because of highly nonlinear characteristics of design variables. In this paper, a new preform design method which can reduce the forming load and the die wear by removing the flash is developed and applied to the pre form design of a piston.

Design/methodology/approach

After finite element analyses of hot forging processes, if the final product is found to have excessive flash and cause high die wear, a new preform design technique, so‐called iterative preform design technique is applied to obtain an optimal preform design. From the results of FE simulations, a boundary region at the outlet of the flash is first selected. Then, by tracing the section along the deformation path to the initial billet, it is possible to obtain a mapped section boundary in the initial billet. After updating the initial shape by removing the exterior region of the mapped section boundary, a finite element simulation is carried out with the updated initial shape. Iterations should be continued until a desired result is obtained.

Findings

It has been confirmed that the proposed preform design technique has a negligible effect on the initial forgeability of the workpiece. It is expected that the tool life will be increased, because the forming load and die wear are reduced as the number of iterations are increased. Moreover, because the preform design reduces the flash, it thereby reduces the waste of material.

Originality/value

In the 3D finite element analysis of a hot forging process, several optimal preform design techniques have been developed. However, it is difficult to use the techniques in general problems because it is difficult to formulate cost functions, which mainly depend on the experience and physical insight of the designer. In addition, tremendous time is consumed in optimizing a problem as a large number of iterations are required in minimizing the objective function. The proposed preform design technique is simple enough to apply to general hot forging problems involving excessive flash. The proposed preform design technique is an offline method and easy to apply to any other analysis program, including commercial programs.

Details

Engineering Computations, vol. 23 no. 1
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 14 October 2013

Krzysztof Drozdowski, Arkadiusz Tofil, Andrzej Gontarz, Zbigniew Pater and Janusz Tomczak

– The purpose of research was to work out manufacturing technology of plane rim from 2618A aluminium alloy based on hammer forging process.

Abstract

Purpose

The purpose of research was to work out manufacturing technology of plane rim from 2618A aluminium alloy based on hammer forging process.

Design/methodology/approach

It was assumed that the manufacturing process consists of die hammer forging and machining. The first stage of the research works was based on designing of the forging process and on numerical simulations in which finite element method was used. On the basis of calculations results, analysis of deformation parameters in the drop forging was made and the rightness of the worked out technology was verified. The second stage of the research works concerned experiments conducted in industrial conditions. Forging dies were constructed and the forging process of a series of drop forgings was carried out. Next machining was done to obtain finished parts.

Findings

The conducted research works on the forging process on hammer of the rim drop forging from 2618A aluminium alloy showed that the application of this technology allows for obtaining the product of good quality. Manufactured rims were destined for exploitative research works, aiming at getting certificate that would allow for their implementation in planes.

Practical implications

The rim is being prepared for implementation in small planes of considerably large wheels load.

Originality/value

The presented hammer forging method of plane rim has not been used so far. In the case of applying the rims in planes building, not only industrial plants with large forging presses but also forgeries with die hammers will be able to produce these parts.

Details

Aircraft Engineering and Aerospace Technology, vol. 85 no. 6
Type: Research Article
ISSN: 0002-2667

Keywords

Article
Publication date: 29 August 2019

Sam Joshy, Jayadevan K.R., Ramesh A. and Mahipal D.

The prime task of research in hot forging industry is to improve the service life of forging dies. The in-service microstructural changes that may occur in a die during hot forging

Abstract

Purpose

The prime task of research in hot forging industry is to improve the service life of forging dies. The in-service microstructural changes that may occur in a die during hot forging is expected to significantly affect the service life. The purpose of this work is to analyse the microstructural evolution of double tempered hot forging dies in a real industrial environment, and the correlation of microstructural and microhardness evolution to the in-service wear and plastic deformation.

Design/methodology/approach

Specific hot forging tests were carried out on double tempered AISI H11 chromium tool steel for 100, 500 and 1,000 forging strokes. Macro analysis was conducted on die cross section to analyse the wear and plastic deformation at different stages of forging cycles. Microhardness and microstructural analyses were performed on the die surface after these forging tests.

Findings

The macro analysis on the transverse section of dies shows that wear is predominant during initial forging strokes, whereas plastic deformation is observed in later stages. Microstructural analyses demonstrate that during first 500 forging cycles, carbide population decreases at 63 per cent higher rate as compared to corresponding drop during 501 to 1,000 forging cycles. Additionally, the carbide size increases at all stages of forging cycle. Further, microstructural images from dies after 1,000 forging strokes show clustering and spherodisation of carbides by which the “blocky”-shaped carbides in pre-forging samples had spherodised to form “elongated spherical” structures.

Practical implications

The findings of this work can be used in hot forging industries to predict amount of wear and plastic deformation at different stages of service. From the results of this work, the service life of double tempered H11 hot forging dies used in forging without lubrication is within 501 to 1,000 forgings.

Originality/value

Most of the literatures are focussed on the cyclic softening of material at constant temperature. This work analyses the microstructural evolution of double tempered hot forging dies in a real industrial environment and correlates the microstructural and microhardness evolution to the in-service wear and plastic deformation.

Details

World Journal of Engineering, vol. 16 no. 5
Type: Research Article
ISSN: 1708-5284

Keywords

1 – 10 of 302