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Ptfe pattern release coating
PTFE
PATTERN
RELEASE
COATING
A fresh approach to the problem of pattern release in foundries has been made with the introduction of Dagstrip 10 aerosol by Acheson Colloids. The pattern release lubricant is ptfe based in a formulation which allows a thin, dry, translucent coating to be deposited without obliterating pattern identification marks. The lubricant is said to be useful for wood or metal patterns and one application gives many draws. Holman Brothers of Cambourne are achieving 60 perfect consecutive draws in release of an aluminium pattern for a mould using only one application of Dagstrip. Acheson Colloids Company, PO Box 12, Prince Plymouth, Devon, England
MARINE
OILS RESEARCH
Rock,
two-stroke RF68 engine is a non-reversing version of the Sulzer RD68 marine engine and is capable of delivering 3, 400bhp at a shaft speed of 150rev/min. Its output corresponds to a brake mean effective pressure (bmep) of over llkg/cm2 (1551bf/in2), which is considerably in excess of the normal rating of the Sulzer 680mm bore engine. This high output has been made possible by two-stage turbocharging with intercollers after both stages of compression. Fig ‘7 shows a piston being removed from a Sulzer 2RF68 engine after a test run. Two other engines in the building are also being used for marine oil research, a single-cylinder Sulzer T48, of 480mm cylinder bore, and a-cylinder Bolnes DKLl90 of 190mm bore. Shell International Petroleum Co, Shell Centre, London SE1
LABORATORIES
A new marine oils research establishment costing about E400, 000 was opened on April 9 at the Royal Dutch/Shell Laboratory in Amsterdam. The establishment is claimed to be the largest of its type in the world and will be concerned with research and development work on lubricants for large, low-speed marine diesel engines. The main research equipment is a new 680mm bore Sulzer 2RF68 crosshead diesel engine, equipped with two-stage turbocharging and built under licence by the Dutch firm of de Schelde. For development work on fuels and especially lubricants a good knowledge of temperatures and heat flow in the engine is essential. It is also important to see how temperatures change throughout a test; therefore the engine is equipped with 33 thermocouples for measurements, and registration of general temperatures (cooling-water, air and oil temperatures, etc). The cylinder liners are provided with another 20 thermocouples and 15 thermocouples are mounted in each piston. All thermocouples are of the cromel/alumel type and all temperatures are monitored on recorders. The thermocouples in the pistons are connected intermittently by compressed air loaded contacts of ‘Norske Veritas’ design. They can be disconnected during running. The two-cylinder
Grease
/1/L
in gas
LONGER
LIFE
FOR SELF-CONTAINED
thread
Bearing
88
8-l
chamber
GREASER
The Greasomatic (Fig 8) is a continuous grease injector which will steadily inject a controlled flow of grease when it is fitted in place of an ordinary grease nipple. It consists of a canister of grease which has an internal chamber containing chemicals, which expand when activated, and slowly eject grease from the main chamber. Recently the working life of Greasomatics under average operating conditions has been increased from four to six months by improving the chemical expellant system and by using improved new greases of the highest quality to resist separation of oil and soap under pressure. Obviously factors such as the ambient temperature, the consistency of the grease selected and the resistance of the bearing affect the life. It is claimed that Greasomatics have worked successfully at temperatures as low as -1O’C (15°F). The Greasomatic will operate in any position and does not have to be mounted vertically and can even be mounted on slowly rotating machine parts, The Wymark
Co, Knapp House, Witcombe,
Gloucester,
England
Erratum On page 110 of Tribology should read
Vol 2 No 2 the caption to Fig 5
6 = 0.424 WbL Ed4 (a + b) @(a +b12 - L2 - 4b2) On page 111 in the caption to Ng 9 the units of E are lbf/inz x 10s. We apologise for these mistakes and hope they have not inconvenienced any readers. TRIBOLOGY
August 1969
149
PATTERN
RELEASE
COATING
A fresh approach to the problem of pattern release in foundries has been made with the introduction of Dagstrip 10 aerosol by Acheson Colloids. The pattern release lubricant is ptfe based in a formulation which allows a thin, dry, translucent coating to be deposited without obliterating pattern identification marks. The lubricant is said to be useful for wood or metal patterns and one application gives many draws. Holman Brothers of Cambourne are achieving 60 perfect consecutive draws in release of an aluminium pattern for a mould using only one application of Dagstrip. Acheson Colloids Company, PO Box 12, Prince Plymouth, Devon, England
MARINE
OILS RESEARCH
Rock,
two-stroke RF68 engine is a non-reversing version of the Sulzer RD68 marine engine and is capable of delivering 3, 400bhp at a shaft speed of 150rev/min. Its output corresponds to a brake mean effective pressure (bmep) of over llkg/cm2 (1551bf/in2), which is considerably in excess of the normal rating of the Sulzer 680mm bore engine. This high output has been made possible by two-stage turbocharging with intercollers after both stages of compression. Fig ‘7 shows a piston being removed from a Sulzer 2RF68 engine after a test run. Two other engines in the building are also being used for marine oil research, a single-cylinder Sulzer T48, of 480mm cylinder bore, and a-cylinder Bolnes DKLl90 of 190mm bore. Shell International Petroleum Co, Shell Centre, London SE1
LABORATORIES
A new marine oils research establishment costing about E400, 000 was opened on April 9 at the Royal Dutch/Shell Laboratory in Amsterdam. The establishment is claimed to be the largest of its type in the world and will be concerned with research and development work on lubricants for large, low-speed marine diesel engines. The main research equipment is a new 680mm bore Sulzer 2RF68 crosshead diesel engine, equipped with two-stage turbocharging and built under licence by the Dutch firm of de Schelde. For development work on fuels and especially lubricants a good knowledge of temperatures and heat flow in the engine is essential. It is also important to see how temperatures change throughout a test; therefore the engine is equipped with 33 thermocouples for measurements, and registration of general temperatures (cooling-water, air and oil temperatures, etc). The cylinder liners are provided with another 20 thermocouples and 15 thermocouples are mounted in each piston. All thermocouples are of the cromel/alumel type and all temperatures are monitored on recorders. The thermocouples in the pistons are connected intermittently by compressed air loaded contacts of ‘Norske Veritas’ design. They can be disconnected during running. The two-cylinder
Grease
/1/L
in gas
LONGER
LIFE
FOR SELF-CONTAINED
thread
Bearing
88
8-l
chamber
GREASER
The Greasomatic (Fig 8) is a continuous grease injector which will steadily inject a controlled flow of grease when it is fitted in place of an ordinary grease nipple. It consists of a canister of grease which has an internal chamber containing chemicals, which expand when activated, and slowly eject grease from the main chamber. Recently the working life of Greasomatics under average operating conditions has been increased from four to six months by improving the chemical expellant system and by using improved new greases of the highest quality to resist separation of oil and soap under pressure. Obviously factors such as the ambient temperature, the consistency of the grease selected and the resistance of the bearing affect the life. It is claimed that Greasomatics have worked successfully at temperatures as low as -1O’C (15°F). The Greasomatic will operate in any position and does not have to be mounted vertically and can even be mounted on slowly rotating machine parts, The Wymark
Co, Knapp House, Witcombe,
Gloucester,
England
Erratum On page 110 of Tribology should read
Vol 2 No 2 the caption to Fig 5
6 = 0.424 WbL Ed4 (a + b) @(a +b12 - L2 - 4b2) On page 111 in the caption to Ng 9 the units of E are lbf/inz x 10s. We apologise for these mistakes and hope they have not inconvenienced any readers. TRIBOLOGY
August 1969
149