The wear of machine parts
Classification of types of wear. At process stage-
shivani are influenced by a number of factors. The most
important ones are as follows:
• the nature and character of friction. The nature is rolling friction
or sliding friction, the nature of dry friction
or with a lubricant;
• the value of specific pressure and the nature of the application
loads (static or dynamic);
• the speed of relative movement of the rubbing is
surfaces;
• method of supply, the quantity and quality of lubricants;
• the ambient temperature of the work parts;
• corrosive environment and the quality of the image
available films;
• the presence of abrasive material, its quality (hardness) and
dimensional characteristics;
• the initial state of the friction surfaces;
• the degree and nature of removal of wear products;
• the shape and dimensions of the rubbing surfaces.
The presence of such a large number of factors, provide
encompassing the influence on the deterioration process, indicate
the complexity of the phenomena occurring in the surface layers.
Depending on the impact of these factors when
the friction surfaces have in place the following processes:
• mechanical (plastic deformation, cutting,
scratching);
• chemical (oxidation, corrosion);
• thermal (temperature effect by friction on
the change in the mechanical characteristics of the surface
layer);
• molecular (diffusion);
• EDM.
These processes cause the surface layers
various types of wear, which established Stan-
Darth GOST 27674-88 "Friction, wear and lubrication. Ter-
mines and definition".
To mechanical abrasion include the following
types: abrasive, hydro and gazoobrazovania, hydro and gas
erosion, cavitation, fatigue, wear when
jamming, wear when fretting.
Corrosion-mechanical wear includes
oxidative deterioration and wear under fretting-
corrosion. EDM wear occurs when
the action of the electric current. Mechanical wear
occurs as a result of mechanical impacts on the surface-
chestnye layers of moving parts. Corrosion-mechanical strength-
Kim called wear and tear from mechanical who-
actions, together with the chemical or electrochemi-
ical interaction of the metal with the working environment.
EDM is called erosive wear
as a result of the impact of discharges during the passage of the elect-
historical current.
All of these types of wear occur
the work of parts in the car.
In real operation conditions of machines is very often
there is a conjunction of several types of
naseleniya. In such cases, set the leading type,
limiting the longevity of the parts, and separate it from
other, related types of fracture surfaces, non-
significantly affecting the performance of the pairing.
The mechanism leading type of wear is determined by
as the friction surfaces. Each type of relevant
em particular only the surface of ISASI-
tion. It is the result of reflection action time
personal factors specific for this process to work
you friction pair, for example, risks on the friction surface
indicate the presence and action of abrasive particles, pow-
Ki oxides arise from the action of corrosive media,
washing formed under the action of fluid flow or
gas, etc.
The features of surface friction
allow you to set the leading type of wear, and knowledge
mechanism and the nature of its flow enable
to develop activities to achieve specified long-
eternity when performing repair work.
Classification of types of wear. At process stage-
shivani are influenced by a number of factors. The most
important ones are as follows:
• the nature and character of friction. The nature is rolling friction
or sliding friction, the nature of dry friction
or with a lubricant;
• the value of specific pressure and the nature of the application
loads (static or dynamic);
• the speed of relative movement of the rubbing is
surfaces;
• method of supply, the quantity and quality of lubricants;
• the ambient temperature of the work parts;
• corrosive environment and the quality of the image
available films;
• the presence of abrasive material, its quality (hardness) and
dimensional characteristics;
• the initial state of the friction surfaces;
• the degree and nature of removal of wear products;
• the shape and dimensions of the rubbing surfaces.
The presence of such a large number of factors, provide
encompassing the influence on the deterioration process, indicate
the complexity of the phenomena occurring in the surface layers.
Depending on the impact of these factors when
the friction surfaces have in place the following processes:
• mechanical (plastic deformation, cutting,
scratching);
• chemical (oxidation, corrosion);
• thermal (temperature effect by friction on
the change in the mechanical characteristics of the surface
layer);
• molecular (diffusion);
• EDM.
These processes cause the surface layers
various types of wear, which established Stan-
Darth GOST 27674-88 "Friction, wear and lubrication. Ter-
mines and definition".
To mechanical abrasion include the following
types: abrasive, hydro and gazoobrazovania, hydro and gas
erosion, cavitation, fatigue, wear when
jamming, wear when fretting.
Corrosion-mechanical wear includes
oxidative deterioration and wear under fretting-
corrosion. EDM wear occurs when
the action of the electric current. Mechanical wear
occurs as a result of mechanical impacts on the surface-
chestnye layers of moving parts. Corrosion-mechanical strength-
Kim called wear and tear from mechanical who-
actions, together with the chemical or electrochemi-
ical interaction of the metal with the working environment.
EDM is called erosive wear
as a result of the impact of discharges during the passage of the elect-
historical current.
All of these types of wear occur
the work of parts in the car.
In real operation conditions of machines is very often
there is a conjunction of several types of
naseleniya. In such cases, set the leading type,
limiting the longevity of the parts, and separate it from
other, related types of fracture surfaces, non-
significantly affecting the performance of the pairing.
The mechanism leading type of wear is determined by
as the friction surfaces. Each type of relevant
em particular only the surface of ISASI-
tion. It is the result of reflection action time
personal factors specific for this process to work
you friction pair, for example, risks on the friction surface
indicate the presence and action of abrasive particles, pow-
Ki oxides arise from the action of corrosive media,
washing formed under the action of fluid flow or
gas, etc.
The features of surface friction
allow you to set the leading type of wear, and knowledge
mechanism and the nature of its flow enable
to develop activities to achieve specified long-
eternity when performing repair work.