Elementos de tribologia: Curso de especialização em engenharia de fabricação e máquinas ferramentas. [Benedito de Moraes Notes: Apostila. Description. CLAUDINO, João B. Motores Diesel Comerciais no Brasil e no Meio Ambiente. São Paulo: Editora Núcleo. Apostila de Tribologia. Escola de Engenharia de São . Apostila Uploaded by. jonalthan · Treinamento Transportador de Correia. Uploaded by. jonalthan · Sensores Inteligentes PCB.
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The importance of friction and resistance movement has been highly recognized by our civilization.
We show here, from where arose the necessity and importance of lubrication. It all started in ancient Egypt, with the need to “carry” colossus and blocks for the construction of Sphinxes and Tribolkgia.
As the lubrication was unknown, the Tribolkgia slaves used branches of trees to drag and pull sleds with approximately 60 tons of blocks. The function of tree branches rollerswas to reduce the sliding friction between the sled and the ground, transforming them into rolling friction.
The first trace of lubrication was found in the appstila wheel that belonged to Ra-At-Ka King of Egyptproved by analysis that the lubricant apostial beef or ram tallow. After this discovery, it was concluded that in ancient Egypt the tallow was used as lubricant under the sleds to facilitate sliding.
At this time Greece celebrated the first Olympic Games, a tradition that continued every four years. One of the modalities of the Olympics was the chariot race, which also had the axles lubricated by animal fat. At this time, the Romans also used the chariots as transportation, which were also lubricated by animal fat.
Apostila para sistema fluidos mecânicos – em inglês
In the Middle Ages animal fat was used sparingly to lubricate the mechanism for opening the gates of castles and on carriages wheels carrying kings and queens. At the end of this century, in Norway, yearthe Vikings Warriors and Maritimes Adventurers were experts in building boats.
They built the first and improved Drakkars – long sailing boats. For a long time, whale oil is been used to lubricate the sails hinge support and the rudder axis. In the begining of the great commercial navigation, whale oil was also used to lubricate the pulleys and rudders of ships. The Oil, mineral existing for about million years, provided in the Antiquity medicinal purposes and later started to be used in lubrication.
It was known as “rock oil, mineral oil and naphtha oil. With the invention of gadgets, the need of lubricating using oil for its perfect functioning emerged. With the civilization development and inventions even more revolutionaries, we highlight one of the greatest inventors, Leonardo da Vinci, who designed large projects that also contributed to the advance of lubrication, as the catapults, excavator, among many others.
The phenomenon of the Industrial Revolution led to the mechanization of industry and transport.
With the growth of textile machinery was used lubricant for the smooth functioning of the machines. In this century, Pennsylvania USA 3 important events occurred: Thus, it was extracted approximately liters of oil per day.
After 5 years of Edwin Drake discoverycompanies dedicated to the extraction of oil. At this time, with the 2nd World War and the need for more powerful machines and cannons, the lubricant was used in astonishing quantities. With the revolution several equipment emerged with the need of lubrication. As well as the equipment, new lubricants arise with the objective of minimizing the friction and prolong the life of equipment.
Apostila para sistema fluidos mecânicos
As well as the machines, lubricants suffered technological changes to meet the extreme requirements in industrial processes. Today, there are several companies in the market that manufacture various types of lubricants with mineral, synthetic and special origin.
Besides having a wide use, the lubricant has a correct method rribologia applications. For this, there are equipment for lubrication, available in Brazil sincewhich are of fundamental use and also minimize the risk of lubricants contamination.
With the global concern for the environment, various studies and researches for lubricants that could be used without harming nature were made.
Currently, the lubrication is a decisive factor in the power of being a source of competitiveness gains, providing improvements in equipment performance, and especially the reduction in maintenance costs. C The first trace of lubrication was found in the sled wheel that belonged to Ra-At-Ka King of Egyptproved by analysis that the lubricant was beef or ram tallow. C At this time Greece celebrated the first Olympic Games, a tradition that continued every four years.
Friction and Flow Stress in Forming and Cutting
C At this time, the Romans also used the chariots as transportation, which were also lubricated by animal fat. Lubrication nowadays As well as the machines, lubricants suffered technological changes to meet the extreme requirements in industrial processes.
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