Method of measuring friction coefficient by using thermal analog machine
A friction coefficient and thermal simulation technology, applied in the field of high temperature friction coefficient, can solve the problems of poor measurement accuracy, only under 75℃ or normal temperature, and small measurement range, so as to improve measurement accuracy, avoid errors and improve accuracy.
Active Publication Date: 2018-07-03
宝武特种冶金有限公司
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[0007] To sum up, in order to solve the problem of accurate measurement of the friction coefficient of solid and liquid lubricants in the prior art, the measurement temperature can only be below 75°C or normal temperature, the measurement range is small, and the measurement accuracy is poor. The present invention provides A method for measuring the coefficient of friction using a thermal simulator is proposed. After a specific compression sample is subjected to precise compression deformation using a thermal simulation test machine under the lubricating condition of the lubricating material to be tested, the diameter of the middle part of the compressed sample after deformation is measured. The size of the middle diameter is compared with the theoretically calculated friction coefficient-middle diameter curve to obtain the friction coefficient of the lubricating material. The invention can quickly and effectively obtain the friction coefficient of different lubricants under high temperature deformation conditions
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[0063] 1) Select the compression sample:
[0064] Select JIS-SUJ 2, the sample size is Φ8*12mm.
[0065] 2) Selection and determination of deformation conditions:
[0066] Deformation temperature: 1000°C;
[0067] Strain rate: 0.1 / s;
[0068] True strain: 0.5.
[0069] 3) Calculation of the reference curve for the relationship between the theoretical friction coefficient and the middle diameter:
[0070] Using numerical simulation software, calculate the theoretical friction coefficient as 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6,
[0071] The corresponding middle diameter size at 0.7 is shown in Table 1:
[0072]
[0073] Table 1 The diameter of the middle part of the model corresponding to the theoretical friction coefficient
[0074] 4) Conduct thermal simulation compression experiments and measure the size of the deformed sample:
[0075] Add the lubricating material to be tested, under its lubricating conditions, use the compression sample selected in the above step 1) a...
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The invention relates to a method of measuring friction coefficient by using a thermal analog machine. The method comprises the following steps: carrying out precise compressive deformation by using athermal analog machine under a lubricating condition of a to-be-tested lubricating material; measuring the dimension of the middle diameter of a deformed compressed test sample; and comparing the middle diameter with a curve of a friction coefficient-middle diameter dimension obtained by theoretical calculation so as to acquire the friction coefficient of the lubricating material. The method provided by the invention can measure the friction coefficient of the lubricating material under a high-temperature condition of the material, in particular in a condition of a reference curve obtained bytheoretical calculation under the condition that the lubricating material changes the shape at the high temperature. Interference of other factors is excluded, and the measuring precision is high. The method is set strictly, a corresponding reference curve is obtained by theoretical calculation again at different transmission rates, deformation temperatures, deformation and different deformationmaterials, and errors caused by experimental conditions and external environments are avoided, so that the measuring precision is further increased.
Description
technical field [0001] The invention relates to a measurement method, in particular to a method for measuring high-temperature friction coefficients of solid and liquid lubricants using a thermal simulation test machine. The method can quickly and effectively obtain the friction coefficients of different lubricants under high-temperature deformation conditions. Background technique [0002] At present, in the field of iron and steel manufacturing, it is often necessary to accurately measure the friction coefficient of solid and liquid lubricants. There are many methods for measuring the friction coefficient of solid and liquid lubricants in the prior art, such as: four-ball method, ring upsetting crude method, but these methods have some limitations, as follows: [0003] 1. Four-ball method - The four-ball method is a method for measuring the friction coefficient given in accordance with the petrochemical industry standard of my country "Measurement of Friction Coefficient o...
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Login to View More IPC IPC(8): G01N19/02
CPCG01N19/02
Inventor 姚雷郑芳张戈徐长征
Owner 宝武特种冶金有限公司