Some standard content:
GB 5763--1998
This standard is a revision of GB5763-86 based on the Japanese Industrial Standard JISD4411-1993 "Brake Linings and Pads for Automobiles".
This standard is not equivalent to JISD4411-1993, but the main core content of the standard - friction performance and its test method is the same as the Japanese standard.
This standard is compared with GB5763-86, and some important technical contents have been modified: the index value adopts the legal measurement unit;
The products are only classified according to the purpose;
The friction performance is revised, and the friction coefficient range and the maximum test temperature △u that are consistent with the actual situation are stipulated; the friction performance test method is partially revised;
The content of the inspection rules is rewritten;
The marking and packaging are revised;
The softness and product marking are cancelled.
Appendix A and Appendix B of this standard are both informative appendices. This standard replaces GB5763-86 from the date of entry into force. This standard is proposed by the State Bureau of Building Materials Industry. This standard is under the jurisdiction of Hangzhou Brake Material Factory. The drafting units of this standard are: Hangzhou Friction Material Co., Ltd., Weiyang Nonmetallic Mineral Research and Design Institute of the State Bureau of Building Materials Industry. 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. 520
National Standard of the People's Republic of China
Brake linings for automobiles
Brake linings for automobilesGB5763—1998
Replaces GR5763·86
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of brake linings for automobiles.
This standard applies to brake linings for automobiles (hereinafter referred to as linings). 2 Referenced standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828-~87 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB/T9439-88 Grey cast iron parts
JB/T7498-94 Sandpaper
3 Classification
The linings are divided into four categories according to their uses, see Table 1.
Table 1 Lining classification
4 Technical requirements
4.1 Appearance quality
For parking brakes
For drum brakes of micro and light vehicles
4.1.1 Whether the lining surface is processed or not shall be agreed upon by the supply and demand parties. *
For medium and heavy-duty drum brakes
For disc brakes
4.1.2 The lining is not allowed to have cracks, blistering, unevenness, warping, twisting and other defects that affect its use. 4.2 Dimension tolerance
The basic dimensions of the lining shall be determined by the purchaser, and the dimensional tolerances of its width and thickness shall comply with the provisions of Table 2. Approved by the State Administration of Quality and Technical Supervision on August 19, 1998, and implemented on February 1, 1999
GB5763—1998
Table 2 Dimensional tolerances
Basic dimensions
>30～60
>60～100
>6. 5～10
>10～20
>20～30
Note: If the purchaser has special requirements, this tolerance may not be used and shall be agreed upon by both parties. 4.3 Friction performance
4.3.1 The friction coefficient of the lining, its allowable deviation and wear rate shall comply with the provisions of Tables 3 to 6. 4.3.2 After the test, the test piece shall not have defects such as cracks and bulges that affect its use, and the test piece shall not have obvious scratches on the friction surface of the disc. Table 31 Friction performance
Friction coefficient (μ)
Permissible deviation of specified friction coefficient (Au) Wear rate (V), 10-°cm2/(N·m) ≤100℃
0.30~0.70
1) Test temperature refers to the friction surface temperature of the test machine disc. 2) The friction coefficient range includes the permissible deviation. 3) The specified friction coefficient shall be agreed upon by the supplier and the buyer. Test temperature)
150℃
0.25~0.70
Table 42 Friction performance
Friction coefficient (μu)
Permissible deviation of specified friction coefficient (Au) Wear rate (V), 10-7cm*/(N·m)
1) Test temperature refers to the friction surface temperature of the test machine disc. 2) The friction coefficient range includes the permissible deviation. 3) The specified friction coefficient shall be agreed upon by both the supplier and the buyer. 522
100℃
0.25～0.65
150℃
Test temperature1
0.25～0.70
200℃
0.20~~0.70
200℃
0.20~0.70
250℃
0.15~~0.70
Friction coefficient2 (μ)
Permissible deviation of specified friction coefficient\(△μ) Wear rate (V), 10-7cm/(N·m）
GB 5763—1998
Table 53 Frictional properties
100℃
0.25~0.65
1) Test temperature refers to the friction surface temperature of the test machine disc. 2) The range of friction coefficient includes the allowable deviation. 3) The specified friction coefficient shall be agreed upon by the supplier and the buyer. 150℃
0.25~~0.70
Table 64 Frictional properties
Friction coefficient\ (μ)
Allowable deviation of specified friction coefficient\ (Au) Wear rate (V), 10-°cm/(N·m) ≤
100℃
0. 25~~0. 65
1) Test temperature refers to the friction surface temperature of the test machine disc. 2) The range of friction coefficient includes the allowable deviation. 3) The specified friction coefficient shall be agreed upon by the supplier and the buyer. 5 Test methods
5.1 Appearance quality is measured by visual inspection and knocking method. 150℃
Test temperature\
200℃
0. 25~0.70
Test temperature1
200℃
0.25~~0.700. 25~0.70
250℃
250℃
0.20～0. 70
300℃
0.25~0.70
300℃
0. 15~0. 70
350℃
0.25~0.70
5.2 The width and thickness dimensions are measured with a vernier caliper with an accuracy of 0.02mm. Other dimensions are determined by negotiation between the supplier and the buyer. 5.3 Friction performance test
5.3.1 Test piece
5.3.1.1 Take two test pieces from the same lining product. 0.200.70
5.3.1.2 The friction surface size of the test piece is 25mm×25mm, and the allowable deviation is -0.2~0mm. 5.3.1.3 The thickness of the test piece is 5~7mm, and the thickness difference between the two test pieces is less than 0.2mm. If the product thickness is less than 5mm, the original thickness shall be used.
5.3.2 Test equipment
The test equipment adopts a fixed speed friction tester, see Appendix A. 5.3.2.1 The distance between the center of the test piece and the center of the rotating axis is 0.15m. 5.3.2.2 The material of the disc is medium grey cast iron grade HT250 of GB/T9439, hardness grade H195 (180～220HB); the metallographic structure of the disc is pearlite. Its surface is treated with sandpaper of medium grain P240 of JB/T7498. 5.3.2.3 The friction force is measured by an automatic recorder. 5.3.2.4 The friction surface temperature of the disc (hereinafter referred to as disc temperature) is measured by pressing a silver sheet (8mm×8mm×0.6mm) welded with a thermocouple on the friction surface of the disc with a force of 0.1～0.2N; the measurement position should be on the center line of the width of the friction part of the disc and 50~100mm from the center of the test piece in the direction of rotation, see Appendix B. 5.3.2.5 The heating and cooling device is inside the disc, and the disc temperature can be adjusted within 100～350℃. 5.3.3 Test conditions
5.3.3.1 The allowable deviation of the test temperature is ±10°C. 5.3.3.2 The disc speed is constant at 400-500r/min. 523
5.3.3.3 The pressure of the test piece is 0.98MPa. GB 5763 - 1998
5.3.3.4 The friction direction is the same as that of the lining. 5.3.4 Test steps
Take 2 test pieces and install them in the test piece support arm, and perform the test in the following order: 5.3.4.1 The test pieces are run-in at a temperature below 100°C until the contact surface reaches more than 95%. Use a micrometer with an accuracy of 0.01mm to measure the thickness of the test piece. 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. 5.3.4.2 At a test temperature of 100°C, measure the friction force during the 5000 revolutions of the disk according to the conditions of 5.3.3, or divide 5000 revolutions into 10 to 20 equal parts and measure the friction force during every 250 to 500 revolutions. After friction, measure the thickness of the test piece according to 5.3.4.1. 5.3.4.3 At each test temperature of 150℃, 200℃, 250℃, 300℃, and 350℃, the same test as in 5.3.4.2 shall be conducted. However, the maximum test temperature for each product shall be as specified in Tables 3 to 6. Notes
1 During the measurement of 5000 revolutions of the disk, the disk temperature shall rise to each specified test temperature within 1500 revolutions. 2 The rise in 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. 5.3.4.4 After the highest test temperature is measured, the friction force during the 1500 revolutions of the disk is measured every 50℃ drop from the highest test temperature until 100℃. However, the temperature should be within 500 revolutions when it drops to the next stage. 5.3.4.5 After the test, the appearance of the test piece and the friction surface of the disk shall be visually inspected. 5.3.5 Calculation
5.3.5.1 The friction coefficient at each test temperature is calculated according to formula (1). · (1)
Where: u
friction coefficient;
friction force (average value of the stable friction force in the second half of the total friction distance), N; F-normal force applied to the test piece (test piece pressure × test piece area), N. 5.3.5.2 The wear rate at each test temperature is calculated according to formula (2). V
A×d_d
Adi dz
= 1. 06 ×
Wherein: V--wear rate, cm\/(N·m); R--distance between the center of the test piece and the center of the rotating axis of the disk (0.15m); total number of revolutions of the disk during the test;
total area of the friction surface of the test piece, cm2;
d,--average thickness of the test piece before the test, cm; d,--average thickness of the test piece after the test, cm; f. total average friction force during the test, N.
Note: The test result of the wear rate (V) is not allowed to be negative. 6 Inspection rules
6.1 Factory inspection items
6.1.1 Appearance inspection.
6.1.2 Dimension inspection.
6.1.3 Friction performance inspection.
6.2 Batching principle
The actual delivery quantity of linings of the same material or specification is regarded as one batch. When the batch is too large, it can also be divided into several small batches. 524
·(2)
6.3 Sampling method and judgment rule
GB 5763-1998
6.3.1 The inspection of the appearance and dimensional deviation of the lining adopts the random sampling method, and the normal inspection one-time sampling plan is used according to GB/T2828, and the special inspection level S-4 is taken, and the AQL value is 2.5. The sampling quantity required for different batches and the judgment of qualified batches or unqualified batches shall comply with the provisions of Table 7.
151～500
501～1200
1201~10000Www.bzxZ.net
>10 000
Sample size
6.3.2 Random sampling for friction performance test shall be carried out in accordance with the provisions of Table 8. Table 8
Sample size
≤10000
>10 000
Number of qualified judgment
Friction performance
Number of unqualified judgment
If each sample is qualified after the test, the batch of products shall be judged as qualified; if any 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. Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The non-working surface of the lining shall be printed with the manufacturer's name or trademark, and the year and month of production. 7.1.2 The sides of the lining packaging box (box) shall be printed with the product name, classification, model specification, manufacturer's name and/or trademark, address, product quantity, specified friction coefficient, inspection and packaging date and this standard number. 7.2 Packaging
7.2, 7 Linings shall be packed tightly and neatly into a clean, dry, sturdy and durable box (box). 7.2.2 Each packaging box (box) shall be packed with linings of the same model and specification; when the user needs, linings supplied in sets may also be packed. 7.2.3 Each packaging box (box) shall be accompanied by a product certificate. 7.3 Transportation
During transportation, the lining shall not be damaged or contaminated by oil or water. 7.4 Storage
The lining shall be stored in a ventilated, dry and flat indoor environment. 525
GB57631998
Appendix A
(Suggested 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 support 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—Code; 17—Oil buffer 18—Friction recording roller Simplified diagram A1 Constant-speed friction testing machine
GB 5763—1998
Direction of rotation3.1 The appearance and dimensional deviation of the lining 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 of 2.5. The sampling quantity required for different batches, and the determination of qualified batches or unqualified batches shall comply with the provisions of Table 7.
151～500
501～1200
1201~10000
>10 000
Sample size
6.3.2 The friction performance test shall be randomly sampled according to the provisions of Table 8. Table 8
Sample size
≤10000
>10 000
Number of qualified judgment
Friction performance
Number of unqualified judgment
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. Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The non-working surface of the lining is printed with the manufacturer's name or trademark and the year and month of production. 7.1.2 The sides of the lining packaging box (box) are printed with the product name, classification, model specification, manufacturer's name and/or trademark, address, product quantity, specified friction coefficient, inspection and packaging date and this standard number. 7.2 Packaging
7.2, 7 Liners should be packed tightly and neatly into clean, dry, sturdy and durable boxes (boxes). 7.2.2 Each packing box (box) should be packed with linings of the same model and specification; when the user needs, linings supplied in sets can also be packed. 7.2.3 Each packing box (box) should be accompanied by a product certificate. 7.3 Transportation
During transportation, the linings should not be damaged or contaminated by oil or water. 7.4 Storage
The linings should be stored in a ventilated, dry and flat room. 525
GB57631998
Appendix A
(Suggested 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 support 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—Code; 17—Oil buffer 18—Friction recording roller Simplified diagram A1 Constant-speed friction testing machine
GB 5763—1998
Direction of rotation3.1 The appearance and dimensional deviation of the lining 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 of 2.5. The sampling quantity required for different batches, and the determination of qualified batches or unqualified batches shall comply with the provisions of Table 7.
151～500
501～1200
1201~10000
>10 000
Sample size
6.3.2 The friction performance test shall be randomly sampled according to the provisions of Table 8. Table 8
Sample size
≤10000
>10 000
Number of qualified judgment
Friction performance
Number of unqualified judgment
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. Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The non-working surface of the lining is printed with the manufacturer's name or trademark and the year and month of production. 7.1.2 The sides of the lining packaging box (box) are printed with the product name, classification, model specification, manufacturer's name and/or trademark, address, product quantity, specified friction coefficient, inspection and packaging date and this standard number. 7.2 Packaging
7.2, 7 Liners should be packed tightly and neatly into clean, dry, sturdy and durable boxes (boxes). 7.2.2 Each packing box (box) should be packed with linings of the same model and specification; when the user needs, linings supplied in sets can also be packed. 7.2.3 Each packing box (box) should be accompanied by a product certificate. 7.3 Transportation
During transportation, the linings should not be damaged or contaminated by oil or water. 7.4 Storage
The linings should be stored in a ventilated, dry and flat room. 525
GB57631998
Appendix A
(Suggested 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 support 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—Code; 17—Oil buffer 18—Friction recording roller Simplified diagram A1 Constant-speed friction testing machine
GB 5763—1998
Direction of rotation
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.