GOST 2172-80

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  ГОСТ 2172-80

GOST 2172−80 steel wire ROFES for aircraft. Technical specifications (with Changes 1−5 N)

GOST 2172−80
The Group Of 75

INTERSTATE STANDARD

STEEL WIRE ROPE FOR AVIATION

Specifications

Stell aircraft ropes. Technical requirements

ISS 77.140.65
OKP 12 5200
12 5800

Date of introduction 1982−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 05.08.80 N 4019

Change No. 5 adopted by the Interstate Council for standardization, Metrology and certification (Protocol No. 20 dated 01.11.2001)

Was standards Bureau MGS N 3969

The adoption of the changes voted:

3. REPLACE GOST 2172−71

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

6. EDITION (April, 2003) with Changes in N 1, 2, 3, 4, 5, approved in December 1983, June 1986, October 1987, June 1991, March 2002 (IUS 3−84, 9−86, 1−88, 10−91, 6−2002)


This standard applies to steel cables used in control systems of airplanes and helicopters.

Requirements PP.1.1, 1.2, 2.8, 2.9, 2.12, 2.13, 2.15, 4.2, 4.8, 4.9, 4.10, 4.12 are required.

(Changed edition, Rev. N 5).

1. BASIC PARAMETERS AND DIMENSIONS

1.1. The ropes are made of double twist rope, type LK-O construction 6x7 (1+6)+1х7 (1+6) — (damn.1) and type TK construction 6х19 (1+6+12)+1х19 (1+6+12) — (damn.2).

Damn.1. Ropes of a type LK-O

Damn.1

Damn.2. Ropes of the type TK

Damn.2

1.2. Main parameters and sizes of cables shall be as specified in table.1.

Examples of symbols:

The rope nominal diameter 2.5 mm, wire carbon steel, galvanized by the group W, high quality:

Rope 2,5 m-P GOST 2172−80

The rope nominal diameter 3.6 mm, wire high-alloyed corrosion-resistant steels, normal quality:

The rope K to 3.6 GOST 2172−80

(Changed edition, Rev. N 1, 4).

Table 1

Note. Ropes diameters marked with an asterisk in new developments is not recommended.

2. TECHNICAL REQUIREMENTS

2.1. Wire ropes shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

Wire ropes shall be made of carbon steel wire according to GOST 7372, brand, galvanized by group C or g and from wire of high corrosion resistant steel 12KH18N9T and 12KH18N10T grades according to GOST 5632 and technical documentation.

The ropes shall be made of wire one marker of the group, while marking a group of wires on a temporary tear resistance shall not be less than:

carbon steel

1960 N/mm(200 kgf/mm) for ropes with diameters of 1.60−6,40 mm;

1770 N/mm(180 kgf/mm) for ropes with a diameter of 7.50−9.50 mm;

of high-alloy stainless steel

1670 N/mm(170 kgf/mm) for all diameters of ropes.

(Changed edition, Rev. N 1, 4).

2.2. (Deleted, Rev. N 4).

2.3. The strands in the rope must not have creases, exposed and dangling wires.

Wire in layers should not have Zapadni of protrusions and perekrashivaniya. The surface of the wires should not have rust, dents, and cut or tapered sections.

On the wire strands of galvanized ropes is allowed crushing of zinc (the result of the application of deforming and leveling of fixtures), not influencing the quality of the rope.

2.4. Wire must be connected by butt welding. Allowed the ends of the wire to patch the firmware through a section of the strand. At the same time allowed the local thickening and disturbance of the lay of the rope in the place of incorporation, not outputting the rope beyond the maximum diameter.

The rope of high quality is allowed no more than one connection to a 10 m rope, ropes normal quality — 5 m rope.

(Changed edition, Rev. N 2, 4).

2.5. The rope should be over the entire length uniform step lay all the elements. The step lay in the rope shall be not more than 6.5 times the nominal diameter of the rope.

A step of stranding outer layer of wire strands should be no more than 9 estimated diameters of the strands in the ropes of a type LK-O and 11 — strands ropes of the type TK.

2.6. The ropes in the manufacturing process is lubricated with grease PVK GOST 19537 or K-17 graveyard 10877.

Allowed the use of other types of lubricants. At the customer’s request ropes are made without lubrication.

(Changed edition, Rev. N 2).

2.7. The ropes are made neraskryvshiesya, cross right lay.

2.8. The ropes made from the wire of carbon steel, must withstand the test of endurance. In this case the test rope diameter, number of turns of the rope, the diameter of the removable roller and the tension of the branches of the rope must meet the requirements of the table.2.

Table 2

(Changed edition, Rev. N 1, 2).

2.9. Breaking strength of ropes, withstood the endurance test, shall not be less than:

52% of the estimated breaking strength specified in table.1, — for cables of higher quality;

50% of the estimated breaking strength specified in table.1 — for ropes of normal quality.

2.10, 2.11. (Deleted, Rev. N 4).

2.12. The quality of zinc coating of wires of carbon steel must conform to the group W or GOST 7372.

2.13. Breaking strength of the rope in General should not be less than specified in table.1.

2.14. Rope length must be at least 300 metres for ropes carbon steel and not less than 25 m for cables of high-alloy corrosion resistant steel.

Allowed on one reel, the number of pieces of ropes of carbon steel, length not less than 25 m, not more than five.

The deviation of the length is not more than +2% for cables with a length up to 500 m and not more than +1% for cables with a length of over 500 m.

(Changed edition, Rev. N 1).

2.15. Ropes made of carbon steel with diameter from 1.6 to 6.4 mm high quality made with elongation, determined at 60% the terminal force. Elongation shall not exceed the values given in table.3.

Table 3

(Changed edition, Rev. N 2).

3. ACCEPTANCE RULES

3.1. The ropes are taken by the parties. The party must consist of ropes of the same size, one grade of steel and decorated with a single document about quality that contains:

trademark or the name and trademark of manufacturer;

the number of the rope;

the symbol of the rope;

the length of the rope indicating each segment in meters according to the sequence of their arrangement on the drum, counting from the neck of the drum;

a lot of rope gross and net, kg;

the results of mechanical tests;

the date of manufacture of the rope;

the image of the mark of conformity for mandatory certification.

(Changed edition, Rev. N 1, 2, 4, 5).

3.2. The appearance, diameter, method and step lay check on each rope.

3.3. To check mechanical properties of the rope and the quality of the surface density of zinc and strength of the zinc coating from each selected three rope cut:

— one — length not less than 2.5 m to test the rope to break in General;

the second length of 1.0 m for control weighing, inspection of the surface density of zinc and strength of the zinc coating;

— third — length 4,0 m (for wire ropes of carbon steel) for fatigue testing and the subsequent rupture of the rope as a whole. The cut for the tensile test should be taken after fatigue testing from the plot of the rope in direct contact with the roller under test.

For cables of higher quality are selected additional segment to test the elongation length of at least 2.5 m.

3.4. From the pre-weighed cut the rope take 10% for checking of the surface density of zinc and strength of the zinc coating.

3.5. In case of discrepancy between test results the requirements of this standard allowed a re-test at twice the number of segments.

The results of repeated tests apply to the entire party.

3.3−3.5. (Changed edition, Rev. N 4).

4. TEST METHODS

4.1. The inspection of the surface of the rope carried out without magnifying devices when rewinding the rope.

4.2. Rope diameter check micrometer according to GOST 6507 at a distance of not less than 5 m from the end of the rope.

4.3. The step lay check with a ruler according to GOST 427 or caliper according to GOST 166, with an accuracy of up to 1.0 mm at a distance of not less than 5 m from the end of the rope.

4.4. The length of the rope is checked at the counter, and in necessary cases — when peremanivanie rope.

4.5. Prescriptivist rope check removing dressings and welding with the end of the rope.

While the strands of the rope within the distance of the step lay from the end of the rope needs to spin or you can spin it so that they can be returned to its original position.

4.6. Diameter of wire measured with a micrometer according to GOST 6507 in two mutually perpendicular directions in the same cross section of the wires.

4.7. (Deleted, Rev. N 4).

4.8. The quality of zinc coating test according to GOST 7372.

Allowed 10% of wires taken for tests, decrease the amount of zinc is 5% provided that the average amount of zinc meets the requirements of GOST 7372.

4.9. Test of ropes at break generally carried out on a tensile testing machine with a force exceeding breaking strength specified in table.1, no more than five times. The distance between clips should be not less than 250 mm. the Test is valid, if the breaking strength of the rope meets the requirements of this standard, no matter in what place there was a gap. If the tear occurred closer than 50 mm from the fixing ends of a rope and breaking force not below the requirements of the standard, repeat the test.

To consolidate the sample, the machine must be equipped with grippers, which ensure reliable fixing.

4.10. Testing rope endurance must be carried out according to GOST 2387.

4.11. A sample of the rope is weighed on scales with an accuracy of at least 0.1 g.

4.12. The definition of elongation is carried out by the method described in the Annex.

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. The ropes are wound on drums number of 4−8 according to GOST 11127, and returnable drums, using them in the prescribed manner. The side of the drum must protrude above the outer layer of wound rope not less than the amount equal to twice the diameter of the rope. The end of the rope tied strands of waste or organic core according to GOST 5269 or other normative and technical documentation, or wire according to GOST 3282 or other regulatory-technical documentation and attach a nail to the inside of the cheek of the drum. On the drum the rope must be laid evenly along the length of the neck without pinching to allow free spooling of rope on drum.

Allowed by agreement between manufacturer and consumer to wind the ropes onto metal reels.

(Changed edition, Rev. N 2, 3, 4).

5.2. For protection from corrosion during transportation and storage of finished ropes are lubricated with lubricants that are applied in their manufacture.

5.3. Cervical discs and drums cover waterproof cardboard according to GOST 6659 or wrapping paper according to GOST 8828, or bituminoase paper according to GOST 515, or anti-corrosive grease, which was smeared rope. Wound on the drum the rope is subjected to additional packaging: wrap up one layer of the paper according to GOST 8828 or polymer film according to GOST 10354, or GOST standards, 16272, or normative-technical documentation and with clapboard the maximum permissible gap between them is not more than 50 mm.

5.4. Transport marking under GOST 14192.

Each reel is supplied with a metal label showing:

the name and trademark of manufacturer;

the rooms of the rope;

the legend of the rope;

the total length of the rope, m;

the mass of the rope gross and net, kg;

the date of manufacture of the rope.

In case of mandatory certification on the label or drum with the rope is applied to the image of the mark of conformity.

The label is attached to the outer side surface of the drum.

Allowed marking indelibly stencilled on the drum surface.

5.5. The ropes are transported by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this form, and the technical conditions of loading and fastening of cargoes.

Transportation ropes are produced rail carriages, light trucks and small shipments.

5.4, 5.5. (Changed edition, Rev. N 5).

5.6. Storage of the ropes — the terms 5 GOST 15150. When storing the rope axis of the drum should be parallel to the floor.

Received for storing the ropes are subject to inspection and lubrication cable lubrication exposed during transportation and loading and unloading sections of the rope.

During long-term storage ropes should be at least once per year to look at the outer layer, and smearing the cable with grease.

5.3−5.6. (Changed edition, Rev. N 2).

5.7. Packaging ropes dispatched to the far North regions and equated areas, produced in accordance with the requirements of this standard.

(Added, Rev. N 2).

APP (mandatory). METHOD OF TESTING ROPES AT ELONGATION

APP
Mandatory

1. Samples for test

1.1. Shall be tested slightly rubbed specimen rope length of at least 2.5 m.

1.2. In necessary cases the sample before the test should be rectified.

2. Testing equipment

2.1. Testing on rope elongation is carried out on a tensile testing machine with a maximum breaking strength not exceeding the breaking strength of the rope more than 5 times.

2.2. The test machine shall meet the requirements of GOST 28840.

2.3. When testing must meet the following basic conditions:

a reliable centering of the specimen in the grips of the testing machine;

the smoothness of loading;

the ability to suspend loading with an accuracy of one smallest division of the scale siloizmeritelya;

the smoothness of the load.

2.4. The scale of the strain gauge should not exceed 0.1 mm.

3. The tests and calculation of results

3.1. A sample of the rope is fixed in the clamps of the testing machine, load to pre-load equal to 63% of the minimum breaking load of the rope is kept under load for 2 minutes and Then the sample is unloaded to the initial load of no more than 5% of the minimum breaking load of the rope. When the load on the rope is the strain gauge with gauge length of 250 mm. After installing the arrow of the strain gauge at zero load increase until the end equal to 60% of the minimum breaking load of the rope.

After exposure of the rope under load for 1 min with a strain gauge take readings corresponding to the calculated elongation length of the rope.

This test is considered complete.

Elongation of the rope () in percent is calculated by the formula

,

where  — the lengthening of the estimated length of the rope in the back-end load;

 — initial design rope length is equal to the measuring base strain gauge.

The values of initial and ultimate loads specified in the table.

APP. (Changed edition, Rev. N 2).



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