Vocabulary of Special Grease Terms

2020-06-01 10:14:20 Shenzhen Hecheng 0

Abrasive wear: mechanical wear caused by two contact surfaces sliding relative to each other

  Additives: A small amount of substances added to improve lubricating performance

  Adhesion improvers: Add additives to oils and fats to improve adhesion (e.g. polyisobutylene)

  Adhesion Lubricant: Add adhesion improver to prevent lubricant from falling due to centrifugal force

  AF coating: anti-friction coating, currently the most widely used dry film solid lubricant, including room temperature curing type and heat curing type. The formulation contains solid lubricating material (called "raw meal") and bonding material, see "Binder"

  Anti-aging: the aging of materials caused by oxidation, overheating, or containing certain metals (such as copper, lead, silver, etc.), by adding certain additives (such as antioxidants) can improve the anti-aging ability of the material

  ASTM: American Society for Testing and Materials

  Base oil: basic components of lubricating oil and grease

  Binder: Non-volatile medium or excipient, used to enhance the binding fastness of solid lubricating material particles or enhance the degree of adhesion between solid lubricating film and friction surface

  Bonding lubricant: see AF coating

  Unscrewing torque: The torque required to loosen a bolt connection

  Chemically inert: (lubricant) does not react with certain substances

  Friction coefficient: the ratio of frictional force to normal force between two contact surfaces

  Low temperature performance: Lubricating oil uses cloud point, pour point and freezing point as indicator values, and the grease can be measured by Kesternich flow pressure and low temperature torque test

  Colloid: stabilize the particles in the liquid (particle size 10-5~10-7cm) as a solution (no particle sedimentation)

  Compound grease: a grease made of metal soap and thickener made of various acids, especially suitable for high temperature and long-term use

  Consistency: an index of grease, which is divided into unoperated cone penetration and working cone penetration, and is determined according to the NLGI (American Grease Institute) standard. Simply divide the consistency into nine grades, for example:

  Consistency level Working cone humanity (1/10mm)

   000 445—475

   00 400—430

   0 350—385

   1 310—340

   2 265—295

   3 220—250

   4 175—205

   5 130—150

   6 85-115

  Density: the mass of lubricant per unit volume at 20℃ (g/cm3)

  Detergents: surfactants that remove surface residues and deposits

  Dispersibility: Improve the dispersibility of insoluble substances in the liquid

  DN value: the reference value of the rotational speed to the rolling bearing grease, expressed by the bearing diameter (mm) times the revolutions per minute

  Dropping point: refers to the temperature at which the grease changes from a semi-solid state to a liquid state. It is an indicator of the heat resistance of the grease. As the temperature increases, the temperature at which the first drop is dropped from the container is determined as the drop point temperature

  Dynamic viscosity: the absolute viscosity, which reflects the internal resistance between the fluid molecules when the lubricating oil flows. Determined by the lubricating oil flowing through the pipe hole or gap

  EP additive: a chemical substance used to improve the ability to withstand heavy loads and high temperatures, thereby enhancing the wear resistance of oil and grease

  Emcor: Corrosion resistance test of rolling bearing grease in water, at least two bearings lubricated with grease run in water for about a week to test, corrosion resistance value is 0 ~ 5 (0 means no corrosion, 5 means severe corrosion)

  Ester oil: compound of acid and alcohol, used as lubricating material and grease production

  Flash point: the lowest temperature at which a flame is exposed to a mixture of oil vapor and air

  Fluorosilicone oil: Silicone oil containing fluorine atoms in the molecule

  Freezing point: the temperature at which the oil solidifies and loses fluidity

  Fretting corrosion and wear: a kind of mechanical and chemical wear caused by the relative sliding of the two contact bodies, and pitting pits appear on the friction surface and oxide debris accumulates between the friction surfaces

  Friction: When two objects move relative to each other, the tangential impedance phenomenon existing on the contact interface

  Grease: Lubricating medium composed of base oil and thickener

  Inhibitors: additives used in lubricants to delay aging and corrosion


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