Search results

1 – 4 of 4
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 1 July 2014

Paweł Rokicki, Grzegorz Budzik, Krzysztof Kubiak, Jacek Bernaczek, Tomasz Dziubek, Marek Magniszewski, Andrzej Nowotnik, Jan Sieniawski, Hubert Matysiak, Rafał Cygan and Andrzej Trojan

The purpose of this paper is to present the advantages of computer-aided design/rapid prototyping (CAD/RP) usage in designing and manufacturing of the core models used for precise…

559

Abstract

Purpose

The purpose of this paper is to present the advantages of computer-aided design/rapid prototyping (CAD/RP) usage in designing and manufacturing of the core models used for precise casting with direct and single solidification of aircraft engine turbine blade cores.

Design/methodology/approach

The process of modelling three-dimensional CAD geometry of research blade in relation to the model of the core was presented with different wax types used in the RP technique.

Findings

The geometry of the blade model has been designed in a way which allows making a silicon mould on the basis of a base prototype in the process of rapid tooling (RP/RT). Filing by different wax types was investigated in mean of the impact on filling accuracy of the mould cavity.

Originality/value

The resulting models were used to make ceramic moulds and carry further work on the development of casting technology in the process of directional solidification and single crystal solidification of core blades of aircraft engines.

Details

Aircraft Engineering and Aerospace Technology: An International Journal, vol. 86 no. 4
Type: Research Article
ISSN: 0002-2667

Keywords

Access Restricted. View access options
Article
Publication date: 3 May 2016

Pawel Rokicki, Grzegorz Budzik, Krzysztof Kubiak, Tomasz Dziubek, Malgorzata Zaborniak, Bogdan Kozik, Jacek Bernaczek, Lukasz Przeszlowski and Andrzej Nowotnik

The purpose of this paper is to present coordinate measuring system possibilities in the meaning of the geometric accuracy assessment of hot zone elements in aircraft engines. The…

323

Abstract

Purpose

The purpose of this paper is to present coordinate measuring system possibilities in the meaning of the geometric accuracy assessment of hot zone elements in aircraft engines. The aim of the paper is to prove that this method, which uses blue light and is most sufficient and cost-saving method, can to be used in the production line for serial manufacturing of elements, for which a high level of accuracy is required.

Design/methodology/approach

The analysis of the geometric accuracy of the blades was performed using non-contact optical coordinate scanner ATOS Triple Scan II Blue Light, manufactured by GOM Company, at the Department of Mechanical Engineering, Rzeszów University of Technology. Geometric analysis was conducted for blades manufactured from different waxes (A7Fr/60 and RealWax VisiJet CPX200), thus comparing injection technique and rapid prototyping (RP) method, and for casting made of Inconel 713C nickel-based superalloy.

Findings

The analysis of the criteria for the method of blades’ measuring selection showed that the chosen system successfully met all criteria for the verification of blades’ geometry at the selected stages of the process. ATOS II optical scanner with blue light technology allows measurement almost regardless of daylight or artificial (white) light. This allows the application of the measurement system in the production cycle, thus eliminating the need to create special conditions for measurements.

Practical implications

Requirements related to the accuracy of measured values, diversity and allowable measurement time are linked with the methods of production. Modern manufacturing methods based on computer-aided design systems/manufacturing/engineering systems require a non-contact optical measurement method based on the computer-aided-based coordinate measuring technique. In case of the non-contact optical scanning method based on the ATOS GOM measuring system, time and measurement costs depend on the methodology of measurement and the possibility of its automation. This is why the presented paper has a practical impact on possibilities for the automation of geometric accuracy measurements of obtained elements in the series production line.

Social implications

The use of ATOS Triple Scan II Blue Light by GOM Company allows the reduction of cost and time of production because of the possibility of the introduction of this system in an automated production line. Additionally, the measurement of hot section blades of aircraft engines by using the blue light method is much more accurate and has implication as it impacts safety of further used manufactured elements.

Originality/value

This paper presents the possibility of using the ATOS Triple Scan II Blue Light measuring system for geometric accuracy measurements in case of hot section blades of aircraft engines. This research is original because it describes three model geometric accuracy measurements, wax model obtained using the injection technique, wax model obtained using the I RP process and casting made of Inconel 713C nickel-based superalloy.

Details

Aircraft Engineering and Aerospace Technology: An International Journal, vol. 88 no. 3
Type: Research Article
ISSN: 1748-8842

Keywords

Access Restricted. View access options
Article
Publication date: 1 April 1984

Joseph L. Tropea

Interrelated conflict and transformation are associated with post World War II U.S. military. Conflicts within the command structure are depicted by military officers in their…

107

Abstract

Interrelated conflict and transformation are associated with post World War II U.S. military. Conflicts within the command structure are depicted by military officers in their writings. Transformation, characterised by military sociologists as a process of “civilianisation,” has informed understanding over the past few decades. However, neither the officer‐writers‘ “close‐up” perspective nor, in retrospect, the sociologists’ sanguine formulations effectively interrelate structural transformation and conflicts in command. In this respect, these literatures suggest relevant analogies: officer‐writers reflect existential crisis not unlike many traditional peoples experiencing consequences of externally induced economic change; sociological characterisations of “civilianisation,” like those of “modernisation,” fail to account for adverse and conflictual consequences of such “development”. Both the “crisis in command” and sociological failures to explicate it may be related to political economy's transformation of the military. That is the argument entailed in this article.

Details

International Journal of Sociology and Social Policy, vol. 4 no. 4
Type: Research Article
ISSN: 0144-333X

Access Restricted. View access options
Article
Publication date: 14 September 2015

Wlodzimierz Anioł

The purpose of this paper is to look at the process of socio-economic modernization experienced by Poland in the period following the fall of communism in 1989 through the lens of…

396

Abstract

Purpose

The purpose of this paper is to look at the process of socio-economic modernization experienced by Poland in the period following the fall of communism in 1989 through the lens of three major narratives in domestic public discourse: the neoliberal, the conservative and the social democratic. Each of them distributes differently the accents, not only as regards preferred values and directions of change but also the modality, methods and pace of their introduction.

Design/methodology/approach

The reflections are inspired by a constructivist approach, stressing the large impact of ideas, narrative and discourse on social change. Moreover the author proposes in the analysis his own identification of three types of modernization: from below, from above and from beyond.

Findings

At least two conclusions follow from the paper. The first asserts that across the entire 25-year period from 1989 to 2014, the most powerful presence in the discourse has been marked by the neoliberal modernization narrative, although the popularity of conservative narrative has been important too. The other conclusion can be expressed in a nutshell as a thesis that impacts “from beyond” have had greatly shaped not only particular narratives but also the very systemic transformation of Poland. Those impacts have assumed forms of various transfers (ideological, institutional, financial and policy), with important roles being played by western governments, epistemic communities and integration structures of the western world.

Originality/value

The following analysis of the public discourse about the modernization of Poland in the recent 25 years is an attempt to develop an original approach to the said issue from the perspective of the three narratives identified by the author. The emphasis on international factors in explaining the nature of Polish transformations after 1989 appears to be another asset of the paper.

Details

International Journal of Social Economics, vol. 42 no. 9
Type: Research Article
ISSN: 0306-8293

Keywords

1 – 4 of 4
Per page
102050