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Article

Jeff Beals

Points out that emerging designs of modules housing electronic components, such as engine control modules, are putting greater demands on dispensing and robotics…

Abstract

Points out that emerging designs of modules housing electronic components, such as engine control modules, are putting greater demands on dispensing and robotics equipment. Looks at the key issues of decreased gasket diameters, zero‐knit lines and speed of processing which are facing equipment suppliers.

Details

Assembly Automation, vol. 16 no. 4
Type: Research Article
ISSN: 0144-5154

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Article

B.G. Staples

The very nature of glassed‐steel equipment precludes the use of welded or threaded connections, and dictates the use of effectively gasketed glass‐to‐glass flanges…

Abstract

The very nature of glassed‐steel equipment precludes the use of welded or threaded connections, and dictates the use of effectively gasketed glass‐to‐glass flanges. Research by the Pfaudler Co. has been directed toward the development of suitable gasket designs that utilise materials which combine the chemical resistance of glass with physical properties of rubber. Additional effort has been expended in determining the proper method of installing gaskets over openings in glassed‐steel vessels.

Details

Anti-Corrosion Methods and Materials, vol. 6 no. 5
Type: Research Article
ISSN: 0003-5599

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Article

Bill Wilson

Discusses the properties of various asbestos‐free gasket materials, in particular expanded PTFE. Presents the factors which need to be taken into account when choosing a…

Abstract

Discusses the properties of various asbestos‐free gasket materials, in particular expanded PTFE. Presents the factors which need to be taken into account when choosing a gasket. Highlights the requirements of gaskets in the automotive industry and the conditions they have to withstand.

Details

Industrial Lubrication and Tribology, vol. 49 no. 6
Type: Research Article
ISSN: 0036-8792

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Article

Ali Soua, Maurice Touratier and Laurent Polac

The aim of the research work presented here is to control the geometric distortions of engine cylinders, which involve both noise and oil consumption. The final goal is…

Abstract

The aim of the research work presented here is to control the geometric distortions of engine cylinders, which involve both noise and oil consumption. The final goal is then to limit pollution from engines. The simulation deals initially with the cold stamping and crushing operations of a cylinder head gasket; based on using solid finite element models from the Abaqus computer code (version 5.3) for large deformation with plasticity and contact, including friction. In addition, experiments have been carried out to identify the plasticity rule for the materials used in order to simulate the crushing of the cylinder head gasket under a given normal pressure representing the clamping operation. The main difficulty of this work is to correlate the cylinder head gasket behaviour and cylinder distortions with the main function of the gasket, i.e. pressurized gas sealing. The cylinder head gasket is a complex multilayered structure made of three spot welded metal sheets. This assembly has many holes of different shapes. Around the cylinder hole on both outer layers of the gasket, there is a small size embossment to ensure gas sealing between the engine block and cylinder head. This rib is not circular because of the combustion chamber shape.

Details

Engineering Computations, vol. 16 no. 1
Type: Research Article
ISSN: 0264-4401

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Article

S.M. El‐Sawy and M. Helaly

Rubber gaskets find wide applications in steel structures. Gaskets are usually used on the edges or on the nail hole positions. These are the weakest positions, where…

Abstract

Rubber gaskets find wide applications in steel structures. Gaskets are usually used on the edges or on the nail hole positions. These are the weakest positions, where corrosion starts, whether the structure is protected by paint or by other methods. In this work, anticorrosive pigments were incorporated in rubber formulations. They are tested by corrosion protection when used as gaskets with steel panels. Results showed that the presence of anticorrosive pigments in rubber gaskets prevents early rusting under it in comparison with the blank. Zinc‐tetroxy chromate pigment exhibited the highest rust inhibiting power when chloroprene rubber formulations were used. The change of the pigment percent barely affect the quality of protection when syrenebutadiene rubber formulation were used. Zinc tetroxy chromate pigment improved the physico‐mechanical properties of chloroprene rubber under investigation. The used formulations can tolerate thermal oxidative aging at 90°C up to 8 days. The rate of vulcanization was not affected by increasing the concentration of the inhibitive pitments.

Details

Anti-Corrosion Methods and Materials, vol. 38 no. 11
Type: Research Article
ISSN: 0003-5599

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Article

Ben Sitler and Ken Lo

Considers the causes of corrosion of avionics antennae and the damage damage it causes. Gives the authors’ view of the disadvantages of conventional antenna attachment and…

Abstract

Considers the causes of corrosion of avionics antennae and the damage damage it causes. Gives the authors’ view of the disadvantages of conventional antenna attachment and sealing techniques. Details an alternative technique ‐ conductive gel gaskets ‐ using a gel sealant developed by Raychem Corporation.

Details

Aircraft Engineering and Aerospace Technology, vol. 71 no. 3
Type: Research Article
ISSN: 0002-2667

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Article

Chuanjun Liao, Xibao Xu, Hongrong Fang, Hongrui Wang and Man Man

The purpose of this paper is to develop a leakage model of metallic static seals, which can be used to accurately predict the leakage rate and study the corresponding seal…

Abstract

Purpose

The purpose of this paper is to develop a leakage model of metallic static seals, which can be used to accurately predict the leakage rate and study the corresponding seal characteristics. The metallic static seal is effectively applied to severe rugged environments where conventional seals cannot meet the needs. More research efforts for deepening the understanding of its seal characteristics are important for its effective and safe applications, of which the study about its leak is one key component.

Design/methodology/approach

In the microscopic observations of the turning surface that is general in the processing of flange surfaces, it is found that the spiral morphology is dominant, which had been also obtained by other researches. There are two potential leakage paths for the flange surface of spiral morphology, one is the radial direction perpendicular to the spiral ridges and the other is the circumferential direction along the spiral groove. Based on the microgeometry characteristics of spiral morphology, the micromorphology of turning flange surface is simplified for the calculation of leakage rate, and the simplified methods of the radial and circumferential leakage paths are presented separately. The topography of flange surface studied in this paper is actually measured, and the Abbott bearing surface curve is adopted to represent the micro-profiles parameters. The radial and circumferential leakage models are further developed based on the assumption of laminar flow of the viscous compressible gas.

Findings

The experiments used to verify the leakage models were carried out, and the experimental values are well agreed with the calculated values. As the contact pressure increases, the change rules of both radial and circumferential leakage rates are obtained and the obvious transition from radial leak to circumferential leak can be found. Using the proposed leakage models, the effects of the key micro-profiles parameters on the leakage rates are studied, and some specific conclusions are given simultaneously, which are favorable for the theoretical study and practical application of the metallic static seal.

Practical implications

By the interpretations of the micromorphology characteristics of turning flange surface, the leakage mechanism of the metallic static seal is further made clear. The proposed leakage model reveals the relationships between the key micro-profiles parameters and some sealing performances about the leakage and can predict the leakage rates of the metallic static seal used in various working conditions.

Originality/value

For the metallic static seal, the simplification of the radial leakage path and the radial leakage model are put forward for the first time, so the total leakage model can be systematically reported based on the micromorphology characteristics of turning flange surface. The effects of the key micro-profiles parameters on the seal behaviors including of the leak rate, critical contact pressure and transition from radial leak to circumferential leak etc are also clarified firstly.

Details

Industrial Lubrication and Tribology, vol. 67 no. 6
Type: Research Article
ISSN: 0036-8792

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Article

Dong Tang, Li Wang, Yang Liu, Ning Liu, Yuzhe Wu and Lie Chen

This paper aims to design and optimize the threaded fastener of leakage current particulate matter (PM) sensor. The corresponding air-tight test is conducted to ensure the…

Abstract

Purpose

This paper aims to design and optimize the threaded fastener of leakage current particulate matter (PM) sensor. The corresponding air-tight test is conducted to ensure the reliability of the installation strategy with screw connection.

Design/methodology/approach

Research on the pressure-deformation curve of seal gasket was conducted and the vibration load of engine was considered for the calculation of the minimum installation pre-tightening force. Simultaneously, the danger threaded section area was calculated, and the carrying capacity was verified. The height of the welding line was studied to ensure the reliability of the application. FEA was carried out to acquire the relationship between local structure size and local stress for continuous improvement of thread connection. The installation torque range was acquired from the torque control principle for the pre-tightening force. The sealing reliability of the connector was proved with leakage.

Findings

The air tightness of the thread connector is proved to be fine. When the pre-tightening force is over 8,000 N, and its length reaches 2 mm, the connector has good reliability at ambient temperature. The tightening torque of 60-74 Nm can guarantee the reliable fixing ability of thread connector, and its plastic non-deformation ability in the process of repeated tearing down.

Originality/value

This paper provides an installation strategy and an optimization of PM sensor, which has a positive effect on the study and the manufacture of PM sensor. It is helpful to further develop PM sensor and after-treatment technology. This kind of real-time monitoring PM sensor needs to be studied further to achieve its commercial application.

Details

Sensor Review, vol. 40 no. 1
Type: Research Article
ISSN: 0260-2288

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Article

Steven C. Moore and Timothy J. Kurcz

Describes the rationale, purpose, and design of the Loctite Corporation One‐PassTM (patent pending) robotic flange cleaning system. Also details two complementary LoctiteTM

Abstract

Describes the rationale, purpose, and design of the Loctite Corporation One‐PassTM (patent pending) robotic flange cleaning system. Also details two complementary LoctiteTM formed‐in‐place (FIP) gasket sealant dispensing systems: AccuPump 1000 (a progressive cavity positive displacement pump for silicone and anaerobic FIP technology), and PressPakTM 1000 (patent pending) (a pumpless dispensing system for silicones, anaerobics, and high viscosity abrasive‐filled adhesives or solder pastes). Integrated with a high‐performance Loctite dispensing system, the One‐PassTM creates a highly robust, robotically controlled FIP flange‐sealing assembly process. This technology combination enables worldwide producers of engines, transmissions and axles to replace expensive molded gaskets with higher‐performing FIP adhesives and sealants at a fraction of the cost.

Details

Industrial Robot: An International Journal, vol. 27 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

Abstract

Details

Industrial Lubrication and Tribology, vol. 57 no. 5
Type: Research Article
ISSN: 0036-8792

Keywords

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