GOST 26614-85

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  ГОСТ 26614-85

GOST 26614−85 antifriction powder Materials. The method of determining the tribological properties (Change No. 1)

GOST 26614−85

Group B59

STATE STANDARD OF THE USSR

ANTIFRICTION POWDER MATERIALS

Method of determining the tribotechnical properties

Powder antifriction materials. Test method for determination
of tribotechnical properties

AXTU 1909

Valid from 01.01.87
before 01.01.92*
______________________________
* Expiration removed
by the decree of Gosstandart of the USSR
from 27.08.91 N 1395 (IUS N 11, 1991). -
Note the «CODE».

DEVELOPED by the Academy of Sciences of the Ukrainian SSR

PERFORMERS

V. N. Klimenko, I. M. Fedorchenko, V. V. Pushkarev, V. V. Palotai, A. E. Kushchevsky, M. Simonovic

INTRODUCED by the Academy of Sciences of the Ukrainian SSR

Vice-President I. K. pokhodnya

APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 26.09.85 N 3004

The Change N 1, approved and put into effect by the Decree of Committee of standardization and Metrology of the USSR from 27.08.91 N 1395 with 01.03.92

Change No. 1 entered the law office of «Code» in the text IUS N 11 1991

This standard specifies the test method antifrictional powder materials to assess their tribological properties in friction with limited lubrication.

The essence of the method consists in determining the dependence of wear and friction of the mating surfaces of the sample material and contrapasso from sliding speed and force of loading and the calculation of wear rate and coefficient of friction.

The method does not apply to materials with a hardness of less than 20 NV NV 150.

1. SAMPLING METHODS

1.1. Samples for testing according to the shape and size should correspond to the features.1.

Damn.1. The samples for testing. The shape and size

Damn.1

1.2. Sampling method indicated in the normative-technical documentation for the particular material or product.

1.3. Samples for test should not be pre-impregnated with lubricating or other fluids.

1.4. Controversies shape and size should correspond to the features.2. Controversies shall be made of steel 45 GOST 1050−88 and peel plies are treated to the hardness 42−45 HRC.

Damn.2. Controversies. The shape and size

Damn.2

(Changed edition, Rev. N 1).

2. EQUIPMENT AND MATERIALS

2.1. The test facility is intended to identify tribotechnical properties should provide:

the frequency of rotation of the shaft mounted with contrapiston from 8 to 24, determined with an error of less than 5%;

the radial runout of the outer surface of contrapasso less than 5 microns;

the contact force of the test sample to contrapasso from 100 to 1000 N. The accuracy of determining strength is not more than 5%;

a continuous recording of linear wear of the test sample and contrapasso size from 5 microns and more. The error check of wear when the shaft is rotating the test set should be less than 5 microns. The scale of the recording on the tape of recorder must be at least 1000:1;

continuous recording friction forces from 0,5 to 250 N. The error of measurement of the friction force when the rotating shaft of the test unit should be no more than 4%. The recording system records the friction force on the strip chart must have a scale of not more than 0.5 N/mm. the sensitivity Threshold of the recording system of the friction force should be not more than 0.5 N.

Schematic diagram of the tests is given in hell.3.

Damn.3. Schematic diagram of the test

1 — sample; 2 — controversies

Damn.3

A diagram and description of friction component test setup is given in recommended Appendix 1.

(Changed edition, Rev. N 1).

2.2. Oiling device with a volume of oil not less than 50 cmis shown in hell.4.

Damn.4. Lubricating device

1 — controverses; 2 — wick; 3 — oil

Damn.4

2.3. Diamond circle 2720−0030 according to GOST 16167−80 (circle hole bored in hell.2).

2.4. Laboratory scales with the greatest limit of weighing 200 g, with weighing error of no more than 0.0002 g according to GOST 24104−88*.
__________________
* On the territory of the Russian Federation GOST 24104−2001. — Note the CODE.

(Changed edition, Rev. N 1).

2.5. Industrial oil I-20 according to GOST 20799−75.

2.6. Liquid for washing of samples:

gasoline according to GOST 443−76;

acetone according to GOST 2603−79;

ethyl alcohol GOST 18300−87.

(Changed edition, Rev. N 1).

3. PREPARATION FOR TESTING

3.1. The test sample installed in the holder. On the shaft of the machine set diamond circle.

3.2. Pre-processing the friction surface of the sample is carried out of the diamond circle at the frequency of rotation of the shaft 8and the force pressing the sample to the range 10 N to eliminate traces of the previous treatment of the sample surface, installed visual.

3.3. The sample in the holder after the pre-processing sequentially washed with benzene, acetone and alcohol, then dried in air.

3.4. Controversies sequentially washed with benzene, acetone and alcohol and dried in air. Determine the mass of contrapasso accuracy up to 0,0005 g.

3.5. Mounted on the shaft of the machine instead of diamond circle controversies and after the installation of the lubrication device (see the devil.4) so that it the wick can touch the surface friction contrapasso, start running.

3.6. The alignment is carried out at frequency of rotation of the shaft 8and the force pressing the sample to contrapasso 100 N to ensure that touch at least 90% of the surface of the sample is established visually.

4. TESTING

4.1. The test consists of separate experiments carried out with combinations of sliding speeds and loads in the sequence specified in the table.

The test is repeated at least three times with replacement samples contrapasso and oil in the lubricating device.

Loading the sample must be carried out in a rotating contrebasse.

4.2. In the beginning of the test the wear of the sample and contrapasso record continuously. After the maximum deflection of the recording device in the heating process of the test system installation continuous recording is carried out for at least 15 min, Then continuous recording will stop and periodically, every 60 min., hold the record for 1 min.

An example of a recording device, periodically registered a depreciation in the experience given on features.5.

Damn.5. An example of a recording device, periodically registered a depreciation in the experience

Damn.5

4.3. After each test with a specific combination of loads and speeds controversies, removed from the machine shaft, and the wick removed from the lubricating device, sequentially washed with benzene, acetone and alcohol and dried in air.

4.4. Determine the mass of contrapasso accuracy up to 0,0005 g.

4.5. Record the friction force during the test produce a first continuously and then intermittently simultaneously with the recording linear wear. The device registered the friction force with the goal of recording a reference line, includes for 1 min before starting the drive test unit. An example of a recording device, periodically registered the friction force is given on features.6.

Damn.6. An example of a recording device, periodically registered the friction force

Damn.6

4.6. Tests to determine the wear and friction forces at each combination of sliding speeds and loads should be considered complete when any one of the following conditions:

the total linear wear of sample and contrapasso greater than 30 microns;

the friction force exceeds 50 N;

the total linear wear of sample and contrapasso is less than 5 µm in the way of friction is 20 km away.

5. PROCESSING OF THE RESULTS

5.1. The total linear wear rate of the sample and contrapasso () is calculated by the formula

,

where is the distance between the reference line on the tape recording device and recording line wear at the end of the test (see the devil.5), mm.

 — the scale of the recording of the recording device;

 — diameter of contrapasso, mm;

 — speed contrapasso with;

 — duration of test, min.

Set the position of the reference line of the linear wear:

on the plot chart paper (see the devil.5) registered the device with continuous recording of depreciation in the initial period of tests to find the point of maximum deflection, caused by the heating of the test system installation;

through the point draw parallel to the longitudinal line of the diagram tape.

5.2. Linear wear intensity of contrapasso () is calculated by the formula

,

where is the mass of contrapasso before testing, g;

 — the mass of contrapasso after the test, g;

 — sample width, mm;

 — diameter of contrapasso, mm;

 — speed contrapasso with;

 — duration of test, min;

 — the density of the material contrapasso, g/cm;

 — coefficient taking into account the mutual overlap of the mating surfaces of the sample material and contrabasso.

The ratio is determined by the formula

,

where  — sample width, mm;

 — diameter of contrapasso.

5.1, 5.2. (Changed edition, Rev. N 1).

5.3. Linear wear intensity of samples () is calculated by the formula

,

where is the total linear wear rate of the sample and contrapasso;

 — the linear wear intensity of contrapasso.

5.4. A lot of wear contrapasso less than 0.002 g in the calculation of the linear wear rate is not considered.

5.5. The value of wear rate is calculated for each test result, obtained at given sliding speeds and loads, shown in the table.

5.6. The friction coefficient () is calculated by the formula

,

where is the distance between the reference line of the recording on the tape recording device and recording line the friction forces at the end of test, mm (see the devil.6);

the price of division of the recording system of the friction force, N/mm;

 — the load on the sample, N.

(Changed edition, Rev. N 1).

5.7. For the evaluation of wear of the sample and contrapasso and the friction coefficient taking the arithmetic means of testing at least three samples.

5.8. The test results recorded in the Protocol, the form of which is given in recommended Appendix 2.

ANNEX 1 (recommended). THE SCHEME OF KNOT OF A FRICTION MACHINE M-22P

ANNEX 1
Recommended

A friction knot (see drawing) consists of a housing 3 in which is slidably mounted on the bearing shaft 11. At the end of the shaft fixed movable controversies 4. On the housing 3 is movable bearings mounted on the carriage 2, the axis of swing which coincides with the axis of rotation of the shaft 11. Carriage 2 is fixed against rotation with the stop of the carriage 12, which interacts with the torque spring 1. The deformation torque of the spring 1 is controlled by the linear displacement sensor 13 mounted on the rack 14. On the bracket of the carriage 10 in the guide 6, a stand 7 with the possibility of radial movement relative to the axis of the shaft 11. On the saddle 7 is attached a stationary sample 5, which is in communication with a movable contrabasson 4. In the bore of the caliper 7 is located freely in the radial direction of the rod 8, one end of which freely rests on the back side of the sample 5, and the second in the linear displacement sensor 9, mounted on the guide bracket 10. The rod 8 is made of a material with a low coefficient of thermal expansion.

Include the drive rotation of the shaft 11, the caliper 7 to the sample 5 is pressed with a predetermined force to contrapasso 4. The friction force occurring between the fixed sample 5 and a movable contrabasson 4, tends to rotate the carriage 2. On the friction force is judged by the deflection torque of the spring 1, as measured by the linear displacement sensor 13.

Wear of the sample and contrapasso determined by the linear displacement sensor 9. The purpose of the rod 8 is to reduce the influence of deformation and heat expansion of the caliper on the results of measurement of wear.

APPENDIX 2 (recommended). The PROTOCOL of the results of determination of the tribological properties according to GOST

ANNEX 2
Recommended