Some standard content:
Publishing Instructions
In order to adapt to the development of my country's automobile industry, promote the implementation of automobile standards, and meet the needs of readers for standard texts, our company has edited and published a series of books entitled "Compilation of National Automobile Standards". This series of compilations is systematically collected according to four major categories, namely automobile comprehensive, engine, body chassis, and electrical instrumentation, and is published in volumes. This volume is the body and chassis volume, which collects 67 current national standards approved and issued before the end of June 1999. The content includes transmission, steering and control systems, load-bearing systems, braking systems, body and its accessories, etc.
The attributes of the national standards collected in this compilation have been marked in the catalog (GB or GB/T), and the year is represented by four digits. In view of the fact that some national standards were published before the national standards were cleaned up and rectified, and have not yet been revised, the main text remains as it is; when readers use these national standards, their attributes shall be subject to those indicated in the catalog (please check the attributes of the standards in the "referenced standards" in the main text of the standard). Since the standards included in this volume were published in different years, we have not changed the methods of expressing the quantities and units involved in the standards.
We believe that the publication of this compilation will play an important role in promoting the improvement of the quality of my country's automobile products and the development of the industry. China Standards Press
September 1999
Transmission, Steering and
Control Systems
GB/T 5764--1998
This standard is based on the Japanese Industrial Standard JISD4311-1995 "Automobile Clutch Face Plate" to revise GB5764--86. This standard is not equivalent to JISD4311-1995, but the main core content of the standard - friction performance and its test method are the same as the Japanese standard.
This standard is compared with GB5764--86, and some important technical contents have been modified: the index values use legal measurement units;
-Au is specified when the maximum test temperature is;
-Simplification of dimensions and deviations;
Partial modification of the friction performance test method;
The curvature radius of both ends of the bending performance fixture support and the pressure head is modified; the inspection rules are rewritten;
Marking and packaging are modified;
Product marking is cancelled.
Appendix A, Appendix B and Appendix C of this standard are all informative appendices. This standard replaces GB5764--86 from the date of its entry into force. This standard is proposed by the State Building Materials Industry Bureau. This standard is under the jurisdiction of Hangzhou Braking Materials. The drafting units of this standard are: Hangzhou Friction Materials Co., Ltd., Weiyang Non-metallic Mineral Research and Design Institute of the State Building Materials Industry Bureau. The main drafters of this standard are: Jiang Shilu, Cai Renhua, Jiang Lifeng, Shang Xingchun, Shi Zhigang. This standard was first issued in January 1986.
This standard is entrusted to Hangzhou Brake Material Factory for interpretation. 3
1 Scope
National Standard of the People's Republic of China
Clutch facings for automobiles
Clutch facings for automobilesGB/T5764-1998
Replaces GB5764--86
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of clutch facings for automobiles. This standard applies to automobile dry clutch facings (hereinafter referred to as facings). 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828-87 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB/T 9439-88
Gray iron castings
JB/T7498-94 Sandpaper
3 Technical requirements
3.1 Appearance quality
3.1.1 The surface processing of the dough sheet should be flat, and no defects such as cracks, blistering, bumps, warping and twisting that affect the use are allowed. 3.1.2 Whether the dough sheet is deeply processed or not shall be agreed upon by the supply and demand parties. 3.2 Dimension deviation
The basic size of the dough sheet shall be determined by the demander, and its deviation and the thickness difference of each sheet shall comply with the provisions of Table 1. Table 1 Dimension deviation
Basic size of outer diameter
Limit deviation
Note: If the demander has special requirements, this deviation may not be adopted, which shall be agreed upon by the supply and demand parties. 3.3 Friction performance
3.3.1 The friction coefficient of the face piece and its allowable deviation and wear rate shall comply with the requirements of Table 2. Thickness
Thickness difference of each piece
0.12 or less
0.15 or less
3.3.2 After the test, the test piece shall not have cracks, bulges or other defects that affect its use, and the test piece shall not have obvious scratches on the circular friction surface. Approved by the State Administration of Quality and Technical Supervision on August 19, 19984
Implementation on February 1, 1999
Friction coefficient 2 (μ)
Permissible deviation of specified friction coefficient\ (Au) Wear rate (V), 10-°cm2/(N·m) ≤GB/T 5764—1998
Table 2 Friction performance
Test temperature 1)
100℃
0.25～~0.60
1) Test temperature refers to the temperature of the friction surface of the test machine disc. 2) The range of friction coefficient includes the permissible deviation. 3) The specified friction coefficient shall be agreed upon by the supplier and the buyer. 3.4 Bending performance
The bending strength and maximum strain of the face piece shall comply with the provisions of Table 3. Table 3 Bending properties
Bending strength, N/mm2
Maximum strain, 10-3mm/mm
4 Test methods
4.1 Appearance quality
Use visual inspection method.
4.2 Dimensions
150℃
0.20~~0.60
Inner and outer diameters are measured with a vernier caliper with an accuracy of 0.02mm, and thickness is measured with a micrometer with an accuracy of 0.01mm. 4.3 Friction performance test
4.3.1 Test pieces
4.3.1.1 Take two test pieces from the same surface.
4.3.1.2 The friction surface size of the test piece is 25mm×25mm, and the allowable deviation is -0.20mm. 4.3.1.3 The thickness of the test piece is the thickness of the surface product, and the thickness difference between the two test pieces is less than 0.2mm. 4.3.2 Test equipment
The test equipment adopts a fixed speed friction tester, see Appendix A. 4.3.2.1 The distance between the center of the test piece and the center of the rotating axis is 0.15m. 4.3.2.2
200℃
0.15～0.60
The material of the disc is GB/T9439 medium gray cast iron grade HT250, hardness grade H195 (180～220HB); the metallographic structure of the disc is pearlite. Its surface is treated with JB/T7498 medium grain P240 sandpaper. 4.3.2.3 The friction force is measured by an automatic recorder. 4.3.2.4 The temperature of the friction surface of the disk (hereinafter referred to as disk temperature) is measured by pressing a silver sheet (8mm×8mm×0.6mm) welded with a thermocouple on the friction surface of the disk with a force of 0.10.2N. The measurement position should be on the center line of the width of the friction part of the disk and 50 to 100mm from the center of the test piece in the direction of rotation, see Appendix B. 4.3.2.5 The heating and cooling device is inside the disk, and the disk temperature can be adjusted within 100 to 200℃. 4.3.3 Test conditions
4.3.3.1 The allowable deviation of the test temperature is ±10℃. 4.3.3.2 The disk speed is constant at 400 to 500r/min. 4.3.3.3 The pressure of the test piece is 0.49MPa. 4.3.3.4 The friction direction is the same as that of the surface sheet. 5
4.3.4 Test steps
GB/T 5764-1998
Take 2 test pieces and install them in the test piece support arm, and test them in the following order: 4.3.4.1 The test pieces are run-in at a temperature below 100℃ until the contact surface reaches more than 95%. Measure the thickness of the test piece with a dry ruler with an accuracy of 0.01mm. The thickness measurement should be carried out after the test piece cools to room temperature. Measure 5 points on each test piece and take the arithmetic mean. 4.3.4.2 At a test temperature of 100℃, measure the friction force during the rotation of the disk for 5000 revolutions according to the conditions of 4.3.3, or divide 5000 revolutions into 10 to 20 equal parts and measure the friction force during each 250 to 500 revolutions. After friction, measure the thickness of the test piece according to 4.3.4.1. 4.3.4.3 Carry out the same test as in 4.3.4.2 at test temperatures of 150°C and 200°C. 4.3.4.4 After the highest test temperature of 200°C is completed, carry out the same test as in 4.3.3 Conditions The friction force during the 3000 revolutions of the disk shall be measured.
The disk temperature shall rise to each specified test temperature within 1500 revolutions. 1
2 The rise of the disk temperature depends on the friction heat of the test piece. When the specified test temperature cannot be reached within 1500 revolutions, an auxiliary heating device may be used. 4.3.4.5 After the test, the appearance of the test piece and the friction surface of the disk shall be visually inspected. 4.3.5 Calculation
4.3.5.1 The friction coefficient at each test temperature shall be calculated according to formula (1). =
Where: -
Friction coefficient;
-Friction force (average value of the stable friction force in the second half of the total friction distance), N; F is the normal force applied to the test piece (test piece pressure × test piece area), N. 4.3.5.2 The wear rate at each test temperature shall be calculated according to formula (2). ××
= 1. 06 × ×=d
Wherein: V
-wear rate, cm\/(N·m);
the distance between the center of the test piece and the center of the rotating axis of the disk (0.15m); the total number of revolutions of the disk during the test;
A——total area of the friction surface of the test piece, cm\; d —average thickness of the test piece before the test, cm, average thickness of the test piece after the test, cm;
fm—total average friction force during the test, N.
Note: The test result of the wear rate (V) is not allowed to be a negative value. 4.4 Bending performance test
4.4.1 Test piece
(1)
(2)
4.4.1.1 Take 3 test pieces from the same surface piece along the friction direction. 4.4.1.2 The thickness of the test piece is (55 ± 0.5) mm in length and (15 ± 0.2) mm in width. If the length of the test piece is less than 55 mm, the length can be (40 ± 0.5) mm. When sampling, there should be no groove in the center of the test piece. 4.4.2 Test equipment
4.4.2.1 Tensile testing machine, load not less than 800N, minimum scale value 1N. 4.4.2.2 Test fixture see Appendix C.
The distance between the fulcrums is 40mm, and it can be 30mm if a short test piece is used. - The radius of curvature of the fulcrum end is 1.5mm, and the radius of curvature of the pressure end is 3mm. 4.4.2.3 Dial indicator, minimum scale value 0.01mm. 6
4.4.3 Test procedures
GB/T 5764 -- 1998
4.4.3.1 Place the test piece with the friction surface facing upward on the fulcrum of the test fixture. 4.4.3.2 Apply pressure to the central part of the test piece at a speed not exceeding 10 mm/min, and measure the maximum load and deflection at the moment of fracture of the test piece.
4.4.4 Calculation
4.4.4.1 The bending strength of the face piece is calculated according to formula (4). 6
Where: α-
bending strength, N/mm2;
d---thickness of the test piece, mm;
b--width of the test piece, mm;
distance between fulcrums, mm;
maximum load, N.
4.4.4.2The maximum strain of the face piece is calculated according to formula (5). Where e—
maximum strain, mm/mm;
-thickness of test piece, mm;
L--distance between support points, mm;
-deflection at failure, mm.
4.4.5 Result expression
The test result is expressed as the arithmetic mean of the test results of three test pieces, accurate to one decimal place. 5 Inspection rules
5.1 Factory inspection items
5.1.1 Appearance inspection.
5.1.2 Dimension inspection.
5.1.3 Friction performance inspection.
5.1.4 Bending performance inspection.
5.2 Batching principle
The actual delivery quantity of the same material or specification of the surface pieces is a batch. When the batch is too large, it can also be divided into several small batches. 5.3 Sampling method and judgment rules
（4）
（5）
5.3.1 The appearance and dimensional deviation of the dough piece shall be inspected by random sampling method, using the normal inspection single sampling plan according to GB/T2828, taking the special inspection level S-4, and the AQL value is 4.0. The sampling quantity required for different batches and the judgment of qualified batches or unqualified batches shall comply with the provisions of Table 4.
≤150
151500
501～1200
1201～10000
>10000
Sample size
5.3.2 Performance inspection shall be randomly sampled according to the provisions of Table 5. Number of qualified judgments
Number of unqualified judgments
Sample size
10:000
>10 000
GB/T5764--1998
Friction performance
Bending performance
If each sample is qualified after inspection, the batch of products is judged to be qualified; if any item is unqualified, double sampling is carried out for re-inspection. If there is still one unqualified item after the re-inspection, the batch of products is judged to be unqualified. 6 Marking, packaging, transportation, storage
6.1 Marking
6.1.1 The manufacturer's name or trademark and the year and month of production are printed on the non-working surface of the dough sheet. 6.1.2 The sides of the dough sheet packaging box (box) are respectively printed with the product name, model specification, manufacturer's name and/or trademark, address, product quantity, specified friction coefficient, inspection and packaging date and this standard number. 6.2 Packaging
6.2.1 The dough pieces should be packed tightly and neatly into clean, dry, sturdy and durable boxes. 6.2.2 Each packing box should contain dough pieces of the same model and specifications. 6.2.3 Each packing box should be accompanied by a product certificate. 6.3 Transportation
During transportation, the dough pieces should not be damaged or contaminated by oil or water. 6.4 Storage
Dough pieces should be stored in a well-ventilated, dry room with a flat floor. 8
GB/T5764
—1998
Appendix A
(Suggestive Appendix)
Constant-speed friction testing machine
1 Pulley; 2--Rotating axis; 3-Axis cooling water nozzle; 4-Cooling water nozzle (fine adjustment); 5-Cooling water nozzle (coarse adjustment): 6-Auxiliary heating device; 7 Test piece; 8-Friction disc; 9-Test piece supporting arm; 10-Pressure shaft; 11-Spring for measuring friction force; 12-Sprocket; 13-Lever level adjustment device; 14-Load lever; 15-Lever level indicator; 16-Magnetic code; 17-Oil buffer; 18-Friction force recording roller Figure A1 Constant-speed friction testing machine
GB/T5764—1998
GB/T 5764 -- 1998
Appendix C
(Suggestive Appendix)
Bend Test Fixture
40 or 30
Bend Test Fixture2 See Appendix C for the test fixture.
The distance between the fulcrums is 40 mm, and can be 30 mm if a short test piece is used. —The radius of curvature of the fulcrum end is 1.5 mm, and the radius of curvature of the pressure end is 3 mm. 4.4.2.3 The minimum scale value of the dial gauge is 0.01 mm. 6
4.4.3 Test procedures
GB/T 5764 -- 1998
4.4.3.1 Place the test piece with the friction surface facing upward on the fulcrum of the test fixture. 4.4.3.2 Apply pressure to the center of the test piece at a speed not exceeding 10 mm/min, and measure the maximum load at the moment of fracture and the deflection at failure of the test piece.
4.4.4 Calculation
4.4.4.1 The bending strength of the face piece is calculated according to formula (4). 6
Wherein: α-
Bending strength, N/mm2;
d---Test piece thickness, mm;
b--Test piece width, mm,
Distance between support points, mm;
Maximum load, N.
4.4.4.2The maximum strain of the face piece is calculated according to formula (5). Wherein: e-
Maximum strain, mm/mm;
-Test piece thickness, mm;
L--Distance between support points, mm;
-Deflection at failure, mm.
4.4.5 Result expression
The test result is expressed as the arithmetic mean of the test results of three test pieces, accurate to one decimal place. 5 Inspection rules
5.1 Factory inspection items
5.1.1 Appearance inspection.
5.1.2 Dimension inspection.
5.1.3 Friction performance inspection.
5.1.4 Bending performance inspection.
5.2 Batching principle
The actual delivery quantity of the same material or specification of the dough pieces is a batch. When the batch is too large, it can also be divided into several small batches. 5.3 Sampling method and judgment rules
(4)
(5)
5.3.1 The appearance and dimensional deviation of the dough pieces shall be inspected by random sampling method. According to GB/T2828, the normal inspection single sampling plan shall be used, and the special inspection level S-4 and AQL value shall be 4.0. The sampling quantity required for different batches and the judgment of qualified batches or unqualified batches shall comply with the provisions of Table 4.
≤150
151500
501～1200
1201～10000
>10000
Sample size
5.3.2 Performance test shall be carried out by random sampling according to the provisions of Table 5. Number of qualified judgments
Number of unqualified judgments
Sample size
10:000
>10 000
GB/T5764--1998
Friction performance
Bending performance
If each sample is qualified after the test, the batch of products shall be judged as qualified; if any one item is unqualified, double sampling shall be carried out for re-testing. If there is still one unqualified item after the re-testing, the batch of products shall be judged as unqualified. 6 Marking, packaging, transportation, storage
6.1 Marking
6.1.1 The non-working surface of the dough sheet shall be printed with the manufacturer's name or trademark, and the year and month of production. 6.1.2 The sides of the dough sheet packaging box (box) shall be printed with the product name, model and specification, manufacturer's name and/or trademark, address, product quantity, specified friction coefficient, inspection and packaging date, and this standard number. 6.2 Packaging
6.2.1 The dough sheets shall be packed tightly and neatly into a clean, dry, sturdy and durable box (box). 6.2.2 Each packaging box (box) shall be filled with dough sheets of the same model and specification. 6.2.3 Each packaging box (box) shall be accompanied by a product certificate. 6.3 Transportation
During transportation, the dough sheets shall not be damaged or contaminated by oil or water. 6.4 Storage
The dough sheets shall be stored in a ventilated, dry room with a flat floor. 8
GB/T5764
—1998
Appendix A
(Suggestive Appendix)
Constant-speed friction testing machine
1 Pulley; 2--Rotating axis; 3-Axis cooling water nozzle; 4-Cooling water nozzle (fine adjustment); 5-Cooling water nozzle (coarse adjustment): 6-Auxiliary heating device; 7 Test piece; 8-Friction disc; 9-Test piece supporting arm; 10-Pressure shaft; 11-Spring for measuring friction force; 12-Sprocket; 13-Lever level adjustment device; 14-Load lever; 15-Lever level indicator; 16-Magnetic code; 17-Oil buffer; 18-Friction force recording roller Figure A1 Constant-speed friction testing machine
GB/T5764—1998
GB/T 5764 -- 1998
Appendix C
(Suggestive Appendix)
Bend Test Fixture
40 or 30
Bend Test Fixture2 See Appendix C for the test fixture.
The distance between the fulcrums is 40 mm, and can be 30 mm if a short test piece is used. —The radius of curvature of the fulcrum end is 1.5 mm, and the radius of curvature of the pressure end is 3 mm. 4.4.2.3 The minimum scale value of the dial gauge is 0.01 mm. 6
4.4.3 Test procedures
GB/T 5764 -- 1998
4.4.3.1 Place the test piece with the friction surface facing upward on the fulcrum of the test fixture. 4.4.3.2 Apply pressure to the center of the test piece at a speed not exceeding 10 mm/min, and measure the maximum load at the moment of fracture and the deflection at failure of the test piece.
4.4.4 Calculation
4.4.4.1 The bending strength of the face piece is calculated according to formula (4). 6
Wherein: α-
Bending strength, N/mm2;
d---Test piece thickness, mm;
b--Test piece width, mm,
Distance between support points, mm;
Maximum load, N.
4.4.4.2The maximum strain of the face piece is calculated according to formula (5). Wherein: e-
Maximum strain, mm/mm;
-Test piece thickness, mm;
L--Distance between support points, mm;
-Deflection at failure, mm.
4.4.5 Result expression
The test result is expressed as the arithmetic mean of the test results of three test pieces, accurate to one decimal place. 5 Inspection rules
5.1 Factory inspection items
5.1.1 Appearance inspection.
5.1.2 Dimension inspection.
5.1.3 Friction performance inspection.
5.1.4 Bending performance inspection.
5.2 Batching principle
The actual delivery quantity of the same material or specification of the dough pieces is a batch. When the batch is too large, it can also be divided into several small batches. 5.3 Sampling method and judgment rules
(4)
(5)
5.3.1 The appearance and dimensional deviation of the dough pieces shall be inspected by random sampling method. According to GB/T2828, the normal inspection single sampling plan shall be used, and the special inspection level S-4 and AQL value shall be 4.0. The sampling quantity required for different batches and the judgment of qualified batches or unqualified batches shall comply with the provisions of Table 4.
≤150
151500
501～1200
1201～10000
>10000
Sample size
5.3.2 Performance test shall be carried out by random sampling according to the provisions of Table 5. Number of qualified judgments
Number of unqualified judgments
Sample size
10:000wwW.bzxz.Net
>10 000
GB/T5764--1998
Friction performance
Bending performance
If each sample is qualified after the test, the batch of products shall be judged as qualified; if any one item is unqualified, double sampling shall be carried out for re-testing. If there is still one unqualified item after the re-testing, the batch of products shall be judged as unqualified. 6 Marking, packaging, transportation, storage
6.1 Marking
6.1.1 The non-working surface of the dough sheet shall be printed with the manufacturer's name or trademark, and the year and month of production. 6.1.2 The sides of the dough sheet packaging box (box) shall be printed with the product name, model and specification, manufacturer's name and/or trademark, address, product quantity, specified friction coefficient, inspection and packaging date, and this standard number. 6.2 Packaging
6.2.1 The dough sheets shall be packed tightly and neatly into a clean, dry, sturdy and durable box (box). 6.2.2 Each packaging box (box) shall be filled with dough sheets of the same model and specification. 6.2.3 Each packaging box (box) shall be accompanied by a product certificate. 6.3 Transportation
During transportation, the dough sheets shall not be damaged or contaminated by oil or water. 6.4 Storage
The dough sheets shall be stored in a ventilated, dry room with a flat floor. 8
GB/T5764
—1998
Appendix A
(Suggestive Appendix)
Constant-speed friction testing machine
1 Pulley; 2--Rotating axis; 3-Axis cooling water nozzle; 4-Cooling water nozzle (fine adjustment); 5-Cooling water nozzle (coarse adjustment): 6-Auxiliary heating device; 7 Test piece; 8-Friction disc; 9-Test piece supporting arm; 10-Pressure shaft; 11-Spring for measuring friction force; 12-Sprocket; 13-Lever level adjustment device; 14-Load lever; 15-Lever level indicator; 16-Magnetic code; 17-Oil buffer; 18-Friction force recording roller Figure A1 Constant-speed friction testing machine
GB/T5764—1998
GB/T 5764 -- 1998
Appendix C
(Suggestive Appendix)
Bend Test Fixture
40 or 30
Bend Test Fixture4 Storage
The dough should be stored in a well-ventilated, dry place with a flat floor. 8
GB/T5764
—1998
Appendix A
(Suggestive Appendix)
Constant-speed friction testing machine
1 Pulley; 2--Rotating axis; 3-Axis cooling water nozzle; 4-Cooling water nozzle (fine adjustment); 5-Cooling water nozzle (coarse adjustment): 6-Auxiliary heating device; 7 Test piece; 8-Friction disc; 9-Test piece supporting arm; 10-Pressure shaft; 11-Spring for measuring friction force; 12-Sprocket; 13-Lever level adjustment device; 14-Load lever; 15-Lever level indicator; 16-Magnetic code; 17-Oil buffer; 18-Friction force recording roller Figure A1 Constant-speed friction testing machine
GB/T5764—1998
GB/T 5764 -- 1998
Appendix C
(Suggestive Appendix)
Bend Test Fixture
40 or 30
Bend Test Fixture4 Storage
The dough should be stored in a well-ventilated, dry place with a flat floor. 8
GB/T5764
—1998
Appendix A
(Suggestive Appendix)
Constant-speed friction testing machine
1 Pulley; 2--Rotating axis; 3-Axis cooling water nozzle; 4-Cooling water nozzle (fine adjustment); 5-Cooling water nozzle (coarse adjustment): 6-Auxiliary heating device; 7 Test piece; 8-Friction disc; 9-Test piece supporting arm; 10-Pressure shaft; 11-Spring for measuring friction force; 12-Sprocket; 13-Lever level adjustment device; 14-Load lever; 15-Lever level indicator; 16-Magnetic code; 17-Oil buffer; 18-Friction force recording roller Figure A1 Constant-speed friction testing machine
GB/T5764—1998
GB/T 5764 -- 1998
Appendix C
(Suggestive Appendix)
Bend Test Fixture
40 or 30
Bend Test Fixture
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.