Some standard content:
UDC 677.72: 669.715-135:621.791.052P97
National Standard of the People's Republic of China
GB6946-93
Aluminium-alloy swaged
ferrulesfor steel wirerope
Published on 1993-12-27
State Administration of Technical Supervision
Implemented on 1994-08-01
National Standard of the People's Republic of China
Aluminium-alloy swaged
ferrules for steel wire rope1 Subject content and scope of application
GB6946-93
Replaces GB6946-86
This standard specifies the classification, technical requirements, test methods, inspection rules, etc. of aluminum alloy pressed joints for steel wire ropes (hereinafter referred to as joints). This standard applies to joints for round strand steel wire ropes with a diameter of 6~60mm and a nominal tensile strength of no more than 1770MPa. This standard does not apply to single strand and special-shaped strand steel wire ropes. 2. Reference standards
GB1102 Round strand steel wire rope
GB/T3190 Chemical composition of aluminum and aluminum alloy processed products GB3191-Aluminum and aluminum alloy extruded bars
GB/T6987 Chemical analysis methods for aluminum and aluminum alloys GB8918 High-quality steel wire rope
3 Classification
3.1 Type
According to the joint structure and shape, it is divided into: Type A - cylindrical joint, see Figure 1a); cylindrical chamfered joint, see Figure 1b); cylindrical tapered end joint, see Figure 1c). Approved by the State Bureau of Technical Supervision on December 27, 1993, and implemented on August 1, 1994
3.2 Model
3.2.1 Model indication method
GB6946—93
Nominal diameter of wire rope;
-Connector number: see Article 3.1
-Type code A, B, C
Connector code: T (head), L (aluminum).
3.2.2 Marking example
For a wire rope with a diameter of 16 mm, a No. 18 cylindrical cone-end aluminum alloy pressed joint is selected according to the cross-sectional area of the wire rope: Joint TLC18-16GB6946
3.3 Specification series
3.3.1 Joint number
The joint number series is as follows:
3.3.2 Basic parameters of joints
The basic parameters of joints shall comply with the provisions of Table 1. Joint number
Basic size
Limit deviation
Selection of joint number
GB6946-93
Basic parameters of joints
Pressure, kN
(reference value)
12 000
The selection of joint number is related to the nominal diameter of the wire rope and its metal cross-sectional area. According to the nominal diameter of the wire rope in Table 2, select the connector number according to the metal cross-sectional area of the wire rope.
Wire ropes between the nominal diameter series of the wire ropes in Table 2 should be included in the series according to the following principles: a.
In the diameter range of 6 to 14mm, the nominal diameter of the selected wire rope should be included in the series with four or five decimal places. For example, 9.3mm is $9mm; bZxz.net
In the diameter range of 14 to 40mm, the difference between the nominal diameter of the selected wire rope and the nominal diameter of the wire rope in Table 2 is less than b.
1mm, the minimum value of the series should be included, and when the diameter difference is greater than or equal to 1mm, the maximum value of the series should be included. For example: $22.5mm is close to $22mm, 31mm is close to 32mm;
c. In the range of diameter greater than 40-60mm, when the difference between the nominal diameter of the selected pot wire rope and the nominal diameter of the steel wire rope in Table 2 is less than or equal to 2mm, it is close to the small value of the series, and when the diameter difference is greater than 2mm, it is close to the large value of the series. For example: $46mm is close to $44mm, 3
47.5mm is close to 48mm.
Wire rope
Nominal diameter
GB6946-93
Table 2 Relationship between metal cross-sectional area of wire rope and joint number First case
Metal cross-sectional area of wire rope
Technical requirements
4.1 General requirements
Joint number
Second case
Metal cross-sectional area of wire rope
Joint number
Third case
Metal cross-sectional area of wire rope
Joint number
4.1.1 Joint material
4.1.1.1 The flat oval tube used in the joint is recommended to be made of LF2 and LF21 aluminum alloy materials in GB3191. The chemical composition should comply with the provisions of GB3190. Mechanical properties: tensile strength ≥170MPa, elongation 8s ≥20%. The chemical composition shall be determined according to the method specified in GB6987. The mechanical properties shall be tested according to the method specified in GB3191. 4.1.1.2
For the specification series and deviation requirements of flat oval tubes, please refer to Appendix A (supplement). The surface of flat round tubes shall be smooth, free of burrs, cracks, mechanical damage and other obvious defects. 4.1.1.4
4.1.1.5Use ultrasonic flaw detection to check the internal defects of the tube. Shrinkage holes, cracks, delamination, slag inclusions, etc. are not allowed. 4.1.2
Wire rope
GB6946-93
4.1.2.1The wire rope matching the joint shall comply with the flat wire rope specified in GB1102 and GB8918, and must be accompanied by a quality certificate.
The nominal tensile strength of the wire rope shall not be greater than 1770MPa. 4.1.3 Conditions of use
4.1.3.1. The joint is not allowed to be bent during use. 4.1.3.2 The working environment temperature range of the joint is 40～+150℃. 4.2 Quality requirements of joints
4.2.1 Wire rope and flat oval tube
4.2.1.1 When a thimble is used, the wire rope enveloping the thimble shall not have loose strands, shall fit tightly and flat, and shall meet the requirements of Article 3.3.2 after pressurization.
4.2.1.2 When there is no thimble, the distance L from the joint to the inner edge of the rope loop must be greater than or equal to 3 times the hook width (B) or 15 times the wire rope diameter (d), see Figure 2.
4.2.1.3 The end of the wire rope shall not be loose before pressurization. 4.2.2 Pressing of joints
4.2.2.1 Before pressing, the joint surface and film of the mold should be clean. The mold should be scrapped when it is worn to the point that it cannot meet the basic size requirements in Table 1. 4.2.2.2
When pressing, the corresponding pressing mold must be selected according to the joint number. The joint must be slowly pressed and formed on the press. 4.2.2.3
Must contact.
The long axis of the flat elliptical four-tube pressed joint must be consistent with the pressurization direction (see Figure 3), and the contact surface of the upper and lower molds must be in Figure 3
4.2-2.5 The wire rope must not be damaged during the pressing process. 4.2.3 Appearance quality of joints
4.2.3.1 The surface of the joint should be smooth, without cracks, flash or burrs. 4.2.3.2 The basic parameters of the joint should comply with the provisions of Table 1. GB6946-93
4.2.3.3 For C-type pressed joints, the end of the wire rope should be sealed inside the joint and should not be greater than 0.5d from the P end of the joint; for A-type and B-type joints, the end of the wire rope must extend beyond the joint by 0.5~1.0d. 4.2.3:4 Joint mold misalignment:
The radial direction should not exceed 0.5mm;
The axial direction should not exceed 1mm.
4.2.3.5 The roundness tolerance of the joint should not exceed 1mm. 4.2.4 Joint strength
The joint should be able to withstand a static load of 90% of the minimum breaking force of the wire rope and an impact load of 15%~30% of the minimum breaking force of the wire rope.
5 Test methods and inspection rules
5.1. Test methods
5.1.1 Test specimens
For the test specimens, the center distance between the two sets of rings shall not be less than 40 times the diameter of the wire rope. 5.1.2 Vibration impact test
The vibration impact test shall be carried out on a fatigue testing machine. The joint is subjected to alternating stress along the axial direction of the wire rope, and its value is 15% to 30% of the minimum breaking tension of the wire rope. The test frequency shall not exceed 250 times/min, and the number of vibration impacts shall not be less than 10 times. Observe whether the sample has slippage or cracks, and record the test results in Appendix B (reference) Table B1. 5.1.3 Tension test
5.1.3.1 Rated tension test
Apply 2 times the rated load of the wire rope to the joint along the rope axis, observe whether the joint has slippage and cracks, and record the test results in Table B2. Note: The rated load of the wire rope is equal to the ratio of the minimum breaking tension of the wire rope to the safety factor. 5.1.3.2 Static tension test
After the vibration impact test, slowly increase the test load to 90% of the minimum breaking tension of the wire rope, observe whether there is slippage and cracks, and record the test results in Table B2.
5.1.3.3 Breaking Tensile Test
After the static tensile test, continue to load until the wire rope breaks or the joint is damaged, and record the results in Table B2. 5.1.4 Dimensional measurement and appearance inspection
Use a caliper with an accuracy of not less than 0.05mm to measure the basic dimensions of the joint, the amount of joint mold displacement and the joint circle, and observe the surface quality of the joint, and record the measurement results in Table B3. 5.2 Inspection rules
Each batch of joints should be inspected before leaving the factory, and the qualified joints should be accompanied by a certificate of conformity before leaving the factory. The factory inspection items are shown in Table 3 of 5.2.1
.
Type inspection should be carried out in any of the following situations: when a new product or old product is transferred to the factory for trial production and appraisal; after formal production, if there are major changes in appearance, materials, processes, etc.; when the normal production products are continuously produced for more than 1 year; when the product is resumed after two years of suspension; when the national quality supervision department makes a request. For type inspection items, see Table 3.
5.2.3 Sampling
Dynamic impact test
Rated tensile test
Static tensile test
Breaking tensile test
Appearance quality inspection
Basic dimension inspection of joint
Inspection of joint extension
Inspection of joint mold misalignment
Inspection of joint roundness
GB6946—93
Factory and type inspection items
Factory inspection
Randomly select 3 pieces from the same joint number as test samples. 5.2.4 Judgment rules
Type inspection
Meet the requirements
Article 4.2.3.1
Article 4.2.3.2
Article 4.2.3.3
Article 4.2.3.4
Article 4.2.3.5
In the factory inspection of the joint, if the rated tensile force or other two indicators of any sample are unqualified, double sampling should be carried out for inspection. If they are unqualified again, the batch of joints will be judged to be unqualified. However, piece-by-piece inspection is allowed. In the joint type inspection, if any sample fails in one of the vibration impact test and static tensile test or other two indicators, double sampling should be carried out for inspection. If they are unqualified again, the batch of joints will be judged to be unqualified. 6
Marking, packaging, transportation, storage
6.1 Marking
All factory joints shall be marked with permanent marks, including the provisions of Article 3.2.1 and the manufacturer's mark. 6.2 Packaging
Joints shall be packed in bare or boxed form and clearly marked. 6.3 Transportation
Joints shall not be mixed with active chemicals or humid materials during transportation. If transported by bulk truck, rainproof and moisture-proof measures shall be taken. 6.4 Storage
a. The warehouse shall be clean and dry, and active chemicals or humid items shall not be stored at the same time. b.: Open-air stacking is not allowed, and stacking directly on the dirt ground is not allowed. If short-term open-air stacking is required, rainproof and moisture-proof measures shall be taken.
A1 Specification series
GB694693
Appendix A
Flat oval tube specification series and requirements
(Supplement)
The specification series of flat oval tubes shall comply with the provisions of Figure A1 and Table A1. Figure A1
Connector number
Connector number
A2 Accuracy requirements
A2.1 Straightness of flat oval tubes
The straightness shall not exceed 4mm within a length of 1m. A2.2 Distortion
GB6946-93
Continued Table A1
The distortion shall not exceed 2.5mm within a length of 1m, see Figure A2. Figure A2
A3 Length requirements
The manufacturing length of the blank is 2 to 6m, and the shortest shall not be less than 1m. 12.5
Connector model
Manufacturer
Production date
Testing unit
Test whip load
GB6946-93
Appendix B
Test record sheet
(reference)
Vibration shock test record sheet
Wire rope specification
Production batch number
Test date
Testing equipment
Times/min
Moving shock
Test results
TesterFigure A2
A3 Length requirements
The manufacturing length of the bad material is 2 to 6m, and the shortest shall not be less than 1m. 12.5
Joint model
Manufacturer
Manufacturing date
Testing unit
Test whip load
GB6946-93
Appendix B
Test record sheet
(reference)
Vibration shock test record sheet
Wire rope specifications
Manufacturing batch number
Test date
Testing equipment
Times/min
Moving shock
Test results
TesterFigure A2
A3 Length requirements
The manufacturing length of the bad material is 2 to 6m, and the shortest shall not be less than 1m. 12.5
Joint model
Manufacturer
Manufacturing date
Testing unit
Test whip load
GB6946-93
Appendix B
Test record sheet
(reference)
Vibration shock test record sheet
Wire rope specifications
Manufacturing batch number
Test date
Testing equipment
Times/min
Moving shock
Test results
Tester
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