HISTORIA DEL ENGRASE
Cuando dos cuerpos sólidos se frotan entre sí , hay una considerable resistencia al movimiento sin importar lo cuidadosamente que las superficies se hayan maquinado y pulido. La resistencia se debe a la acción abrasiva de las aristas y salientes microscópicas y la energía necesaria para superar esta fricción se disipa en forma de calor o como desgaste de las partes móviles.
Históricamente , el primer lubricante fue el sebo. Se utilizaba para engrasar las ruedas de los carros romanos ya en el año 1400 A.c. en la actualidad los lubricantes suelen clasificarse en grasas y aceites.
Estas dos clases de lubricantes aparecieron teniendo en cuenta factores tales como velocidades de operación , temperaturas, cargas, contaminantes al medio ambiente, tolerancias entre las piezas a lubricar, períodos de lubricación y tipos de mecanismos. Existen diferentes grados de grasas y aceites dependiendo de la necesidad que se tenga y de los factores de operación.
Una mala selección es tan peligrosa como si se hubiese dejado el mecanismo sin lubricante alguno. Muchos de los fallos que ocurren en este campo tienen
su origen aquí ; de ahí la seguridad que se debe tener cuando se seleccione un lubricante.
Un engrase depende de tres elementos: el lubricante, la dosificacion y la periodicidad.
SISTEMAS DE ENGRASE Y LUBRICACION LOS PROFESIONALES DEL ENGRASE
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