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Article
Publication date: 9 March 2010

Włodzimierz Ochoński

The purpose of this paper is to present short characteristics of shape memory alloys (SMA) and shape memory polymers (SMP) and some examples of application of these materials in…

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Abstract

Purpose

The purpose of this paper is to present short characteristics of shape memory alloys (SMA) and shape memory polymers (SMP) and some examples of application of these materials in industrial sealing technology.

Design/methodology/approach

In this paper, short characteristic of shape memory materials and design examples of applying them in industrial sealing technology such as: tube coupling in hydraulic systems, flanged pipe connections, lip radial seal, mechanical face seal, soft gland packing, magnetic fluid seal, and in bearing seal system for drill bit, are given.

Findings

The paper provides information about innovative fluid seal designs based on particular properties of the shape memory materials, applied in stationary joints, and rotary equipments. These new solutions provide often to simplify seal design, their miniaturization, increase of tightness, and reduction of operating costs.

Originality/value

This paper offers some new fluid seal designs based on the shape memory materials and their practical application in industrial sealing technology.

Details

Industrial Lubrication and Tribology, vol. 62 no. 2
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 3 April 2007

Robert E. Williams, Daniel F. Walczyk and Hoang T. Dang

To determine the feasibility of sealing and finishing conformal cooling/heating channels in profiled edge laminae (PEL) rapid tooling (RT) using abrasive flow machining (AFM).

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Abstract

Purpose

To determine the feasibility of sealing and finishing conformal cooling/heating channels in profiled edge laminae (PEL) rapid tooling (RT) using abrasive flow machining (AFM).

Design/methodology/approach

Sample PEL tools constructed of both aluminum and steel were designed and assembled for finishing by AFM. A simple design of experiments approach was utilized. Output parameters of interest included the material removal, surface roughness improvement and, most importantly, the ability to withstand a pressurized oil leak test.

Findings

AFM significantly improved the finish in the channels for aluminum and steel PEL tooling. Leak testing found that AFM also improved the sealing of both stacks at static pressures up to 690 kPa. The steel tooling appeared to benefit more from the AFM process. It has been postulated that the primary cause of the sealing is the plastic deformation of workpiece material in the plowing mode.

Research limitations/implications

The conformal channels studied had a simple cross‐sectional geometry and straight runs. The PEL tools were only made of two materials. However, the research results show great promise for large RT, including thermoforming and composite forming molds where temperature control is a critical issue.

Practical implications

The ability to seal the interfaces between individual laminae expands the potential application of AFM tremendously. AFM also has the potential to finish a wide range of internal passages in a variety of RT.

Originality/value

AFM has been previously used for finishing stereolithography prototypes. This is the first known attempt to seal and finish channels in laminated RT using AFM.

Details

Rapid Prototyping Journal, vol. 13 no. 2
Type: Research Article
ISSN: 1355-2546

Keywords

Article
Publication date: 1 March 1989

Lars Bergstrom reports on the robotic seam sealing process of which ABB Robotics has over 5 years' experience in the car industry. Now second generation systems are emerging.

Abstract

Lars Bergstrom reports on the robotic seam sealing process of which ABB Robotics has over 5 years' experience in the car industry. Now second generation systems are emerging.

Details

Industrial Robot: An International Journal, vol. 16 no. 3
Type: Research Article
ISSN: 0143-991X

Article
Publication date: 1 March 1990

Mechanical face seals were first introduced more than 70 years ago for sealing rotating shafts. As the technology of mechanical seals was improved over the years, they were found…

Abstract

Mechanical face seals were first introduced more than 70 years ago for sealing rotating shafts. As the technology of mechanical seals was improved over the years, they were found to offer significant advantages over the existing methods of sealing, for example, with soft packed glands. These benefits included reduced leakage and the elimination of the need for regular maintenance. Today mechanical seals are widely used on centrifugal pumps, compressors, and similar equipment for liquid/gas or gas/gas sealing.

Details

Industrial Lubrication and Tribology, vol. 42 no. 3
Type: Research Article
ISSN: 0036-8792

Article
Publication date: 1 July 1949

Modern oil seals are precision made parts and they must be handled, fitted and maintained as such. The following article provides information that should be known by every machine…

Abstract

Modern oil seals are precision made parts and they must be handled, fitted and maintained as such. The following article provides information that should be known by every machine designer, lubrication engineer and maintenance fitter. It includes a description of the Gaco M.I. oil seal for rotating shafts and is based upon manufacturing methods and photographs taken at the works of Messrs. George Angus Co. Ltd., Newcastle‐upon‐Tyne.

Details

Industrial Lubrication and Tribology, vol. 1 no. 7
Type: Research Article
ISSN: 0036-8792

Article
Publication date: 1 August 1953

The correct sealing of antifriction bearings is just as important as correct lubrication, in fact one is almost useless without the other.

Abstract

The correct sealing of antifriction bearings is just as important as correct lubrication, in fact one is almost useless without the other.

Details

Industrial Lubrication and Tribology, vol. 5 no. 8
Type: Research Article
ISSN: 0036-8792

Article
Publication date: 1 March 1987

Robert M. Smith

THE techniques employed in the sealing of different types of fluid systems used in today's aircraft have been developed over many years. These systems contain equipment which…

Abstract

THE techniques employed in the sealing of different types of fluid systems used in today's aircraft have been developed over many years. These systems contain equipment which incorporates seat configurations designed to give maximum sealing efficiency. High performance polymers have been used for the basis of these seals together with the continuing development of plastics have combined to give new life to older seal shapes while providing the opportunity for entirely new designs.

Details

Aircraft Engineering and Aerospace Technology, vol. 59 no. 3
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 8 January 2018

Yun He, Fanghong Sun and Xuelin Lei

This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing…

Abstract

Purpose

This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing uniform, wear-resistant and easily polished diamond coatings on massive mechanical seals in a large-scale vacuum chamber.

Design/methodology/approach

The computational fluid dynamics simulation test and its corresponding deposition experiment are carried out to improve the uniformity of diamond films on massive mechanical seals. The polishing properties and sealing performance of mechanical seals coated with three different diamond films (microcrystalline diamond [MCD], nanocrystalline diamond [NCD] and microcrystalline/nanocrystalline diamond [MNCD]) and uncoated mechanical seals are comparatively studied using the polishing tests and dynamic seal tests to obtain the optimized diamond coating type on the mechanical seals.

Findings

The substrate rotation and four gas outlets distribution are helpful for depositing uniform diamond coatings on massive mechanical seals. The MNCD-coated mechanical seal shows the advantages of high polishing efficiency in the initial polishing process and excellent wear resistance and self-lubrication property in the follow-up polishing period because of its unique composite diamond film structures. The MNCD-coated mechanical seal shows the longest working life under dry friction condition, about 14, 1.27 and 1.9 times of that for the uncoated, MCD and NCD coated mechanical seals, respectively.

Originality/value

The effect of substrate rotation and gas outlets distribution on temperature and gas flow field during diamond deposition procedure is simulated. The MNCD-coated mechanical seal exhibits a superior sealing performance compared with the MCD-coated, NCD-coated and uncoated mechanical seals, which is helpful for decreasing the operating system shut-down frequency and saving operating energy consumption.

Details

Industrial Lubrication and Tribology, vol. 70 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 1 May 1959

E.G. Ellis

ON December 20th, 1910, Mr. E. W. Dunne, the inventor of the arrow‐headed, tail‐less, twin screw biplane, made an experimental flight which deserves greater recognition than it…

Abstract

ON December 20th, 1910, Mr. E. W. Dunne, the inventor of the arrow‐headed, tail‐less, twin screw biplane, made an experimental flight which deserves greater recognition than it has perhaps received. In order to demonstrate the inherent stability of the design, he flew a circuit at Eastchurch “hands‐off” while writing his observations of its behaviour. To do this he provided the controls with a set of locking levers designed to give a small number of set positions to correspond with turns, climbing, etc. The test was completely successful and Mr. Dunne returned safely to terra‐firma albeit this was the first time that he had turned this particular machine at any height !

Details

Industrial Lubrication and Tribology, vol. 11 no. 5
Type: Research Article
ISSN: 0036-8792

Article
Publication date: 1 June 2005

Wlodzimierz Ochonski

To present some new designs of magnetic fluid exclusion seals for rolling bearings and possibility to use them in modern industrial sealing applications.

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Abstract

Purpose

To present some new designs of magnetic fluid exclusion seals for rolling bearings and possibility to use them in modern industrial sealing applications.

Design/methodology/approach

In the paper is given principle of magnetic fluid sealing technology and are presented new designs of magnetic fluid exclusion seals for rolling bearings, such as compact magnetic fluid seals, two‐stages seals being combination of magnetic fluid seal and labyrinth seal or radial lip seal, magnetic fluid seals with “floating” magnetic system. This paper also shows examples of their application in various rotating process equipment.

Findings

Provides information about new designs of bearing seals and gives the main advantages of these seals over other types, such as total tightness, low viscous drag, maintenance‐free service and high reliability.

Originality/value

This paper offers some new designs of high‐performance magnetic fluid exclusion seals for rolling bearings and points their practical applications.

Details

Industrial Lubrication and Tribology, vol. 57 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

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