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Brake disc for automobile
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GB/T 34422-2017
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Detail Information of GB/T 34422-2017; GB/T34422-2017
Description (Translated English): Brake disc for automobile
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: T24
Classification of International Standard: 43.040.40
Word Count Estimation: 14,194
Date of Issue: 2017-10-14
Date of Implementation: 2018-05-01
Drafting Organization: National Auto Parts Product Quality Supervision and Inspection Center, Yantai Resort Auto Parts Manufacturing Co., Ltd., Laizhou Sanli Auto Parts Co., Ltd., Yantai Meifeng Machinery Co., Ltd., Longkou Yutong Machinery Factory, Shandong Longji Machinery Co., Ltd.
Administrative Organization: National Automotive Standardization Technical Committee (SAC/TC 114)
Proposing organization: Ministry of Industry and Information Technology of the People Republic of China
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of PRC; China National Standardization Administration
GB/T 34422-2017
Brake disc for automobile
ICS 43.040.40
T24
National Standards of People's Republic of China
Automotive brake discs
2017-10-14 Published
2018-05-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard by the National Automotive Standardization Technical Committee (SAC/TC114) centralized.
This standard was drafted unit. National Motor Vehicle Parts Product Quality Supervision and Inspection Center, Yantai Resort Auto Parts Manufacturing Co., Ltd.
State Sanli Auto Parts Co., Ltd., Yantai Meifeng Machinery Co., Ltd., Longkou Yutong Machinery Factory, Shandong Longji Machinery Co., Ltd.
The main drafters of this standard. Li Hong, Zheng Yunxia, Zhou Hongtao, Cuilan Fang, Zhang Baozhi, Wang Ping, Wang Song, Sun Zhenlin, Yang Weiyao.
Automotive brake discs
1 Scope
This standard specifies the terms and definitions, classification, technical requirements, test methods for automotive brake discs (hereinafter referred to as "brake discs").
This standard applies to the provisions of GB/T 15089-2001 Class M and Class N vehicle service brakes, the body material is gray cast iron system
Drive plate, brake discs of other materials can be implemented by reference.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy diamipin methane Molybdophosphoric acid Gravimetric method for the determination of phosphorus content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite - sodium nitrite titration method for the determination of manganese content
GB/T 223.59 steel and alloy - Determination of phosphorus content bismuth phosphomolybdate blue spectrophotometry and antimony phosphomolybdate blue spectrophotometry
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction spectrophotometric method for the determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium periodate (potassium) photometric method for the determination of manganese content
GB/T 231.1 Brinell hardness test of metallic materials - Part 1. Test methods
GB/T 1031 Geometrical product specifications (GPS) Surface texture Profile method Surface roughness parameters and their values
GB/T 1958 Geometrical product specifications (GPS) shape and position tolerance testing requirements
Geometrical product specifications (GPS) - Inspection of smooth workpiece dimensions
GB/T 7216 gray cast iron metallographic examination
GB/T 9239 (all parts) Mechanical vibration constant (rigid) Rotor balance quality requirements
GB/T 9439 gray cast iron
Classification of motor vehicles and trailers
GB/T 20123 Steel - Determination of total carbon and sulfur content High frequency induction furnace combustion infrared absorption method (conventional method)
QC/T 556 Automotive Brake Temperature Measurement and Thermocouple Mounting
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Ventilated dish ventilateddisc
Between the two friction surface ventilation brake disc.
3.2
Solid disk soliddisc
There is no ventilation ducts between the two friction surfaces.
3.3
Mountingsurface
Installed on the hub and hub fit surface is the brake disc mounting reference surface.
3.4
Thickness difference discthicknessvariation; DTV
The variation of the thickness of two friction surfaces on either circumference.
3.5
Minimumthickness minimum thickness
Brake disc wear the minimum available remaining thickness.
4 categories
4.1 brake disc classification
4.1.1 press the brake disc between the two friction surfaces can be divided into solid and ventilated dish ventilation tray.
4.1.2 According to the overall structure of the brake disc can be divided into disc hub integrated brake disc, I-shaped brake disc and ordinary brake disc.
4.2 brake disc structure example
4.2.1 hub integrated brake disc
Hub-integrated brake disc main structure shown in Figure 1.
a) b)
c) d)
Figure 1 hub integrated brake disc structure example
4.2.2 I-shaped brake disc
I-shaped brake disc main structure shown in Figure 2.
a) b)
c) d)
Figure 2 I-shaped brake disc structure example
4.2.3 ordinary type brake disc
Common type brake disc main structure example shown in Figure 3.
a) b)
c) d)
e)
Figure 3 ordinary type brake disc structure example
5 technical requirements
5.1 General
Products shall be manufactured according to the product drawings and technical documents approved by the prescribed procedures.
5.2 mechanical properties
Brake disc body mechanical properties should be consistent with the provisions of Table 1.
Table 1 brake disc body mechanical properties requirements
material
Wedge pressure
N/mm2
Friction surface hardness
HBW
Unilateral friction surface hardness difference
HBW
HT150-GT ≥105 130 ~ 205
HT200 ≥130 150 ~ 230
HT200-GT ≥130 150 ~ 230
HT250 ≥155 180 ~ 255
≤20
Note GT in material grades refers to high carbon.
5.3 chemical composition
The basic chemical composition of the brake disc body should be consistent with the provisions of Table 2, the other chemical composition determined by both supply and demand.
Table 2 brake disc body chemical composition requirements
material
Chemical composition (mass fraction) /%
C Si Mn SP
HT150-GT 3.60 ~ 3.90 1.60 ~ 2.20 ≥0.40 ≤0.12 ≤0.10
HT200 3.10 ~ 3.60 1.90 ~ 2.30 0.60 ~ 0.90 ≤0.15 ≤0.15
HT200-GT 3.60 ~ 3.90 1.50 ~ 2.10 0.60 ~ 0.90 ≤0.12 ≤0.10
HT250 3.10 ~ 3.60 1.70 ~ 2.50 0.60 ~ 0.90 ≤0.12 ≤0.15
Note GT in material grades refers to high carbon.
5.4 Metallography
Brake disc body microstructure should be consistent with the provisions of Table 3.
Table 3 Brake disc body microstructure requirements
Test project technical requirements
Graphite graphite morphology should be mainly A-type graphite, AB-type graphite should be not less than 85%, allowing a small amount of D-type, E-type graphite
Graphite length grade 2 to 6
Pearlite uniform fine flake pearlite, ferrite number should not exceed 5%, does not allow ledeburite
Carbides, phosphorus eutectic carbide quantity should not exceed 2%, the number of phosphorus eutectic should not exceed 1%, not allowed to have reticular phosphorus eutectic
5.5 dimensional tolerances and geometric tolerances
Brake disc size tolerance and shape tolerance should be consistent with the provisions of Table 4.
Table 4 brake disc size tolerance and shape tolerance requirements
Vehicle Type
Reference hole diameter
Tolerance level
Ventilation disk unilateral wall thickness changes
mm
Friction surface flatness
mm
Friction surface beating
mm
DTV
mm
Mounting surface flatness
mm
M1, N1 ≤H9 ≤1.5 ≤0.05 ≤0.05 ≤0.01 ≤0.05
M2, N2, M3, N3 ≦ H9 ≦ 2.0 ≦ 0.05 ≦ 0.10 ≦ 0.015 ≦ 0.05
5.6 friction surface roughness
Brake disc friction surface roughness Ra value should not be greater than 3.2μm.
5.7 The amount of unbalance remaining
5.7.1 brake disc remaining unbalance amount shall comply with the provisions of Table 5.
Table 5 brake disc remaining unbalance requirements
Disc outer diameter
mm
The remaining imbalance
g · mm
Disc hub integrated brake disc
I-shaped brake disc
Total height <130mm The total height ≥ 130mm
Ordinary type brake disc
<315 ≤3500 ≤3500 ≤7000 ≤2000
≥315, <355 ≤5000 ≤5000 ≤10000 ≤2800
≥355 - ≤12000 ≤16000 ≤3500
5.7.2 brake disc balance should be used to remove the material, the size of the material should be removed to comply with the provisions of Figure 4.
The unit is millimeter
Figure 4 brake disc removal material diagram
5.8 appearance requirements
5.8.1 The product should be free of cracks, cold insulation, shrinkage and other defects, defects do not allow welding, repair. Casting surface should be shot blasting, no sticky sand surface.
5.8.2 Brake disc friction surface and mounting surface connection and mounting holes around the 10mm range is not allowed defects. Friction surface, mounting surface
Trachoma, stomatal defects diameter should not be greater than 2mm, the depth should not exceed 0.5mm, the same side does not allow more than two defects, defect spacing
Should not be less than 50mm.
5.8.3 brake disc friction surface, mounting surface, and the wheel coupling surface should not bumps and burrs, sharp edges should be blunt.
5.9 Minimum thickness
Brake disc should be marked in a prominent position of the minimum thickness, marking should be clear and permanent.
5.10 bench test
5.10.1 thermal fatigue test
5.10.1.1 M1, Brake disc samples for N1 vehicles are to be tested in accordance with Annex A.4.1.1 and the following requirements shall be met.
a) The number of cycles of thermal fatigue test at the failure of a brake disc sample is greater than or equal to 150, or
b) The number of cycles of thermal fatigue test at the failure of a brake disc sample is greater than 100 but less than 150, then a new disc sample
experimenting. The thermal fatigue test cycles for both samples were greater than 100.
5.10.1.2 Brake disc samples for M2, M3, N2 and N3 vehicles are to be tested according to A.4.1.1 and the following requirements shall be met.
a) The number of cycles of thermal fatigue test at the failure of the brake disc sample is greater than or equal to 15, or
b) The number of cycles of thermal fatigue test at the failure of the brake disc sample is greater than 10, but less than 15, then a new sample of the brake disc
Line test. The thermal fatigue test cycles for both samples were greater than 10.
5.10.2 high-load test
Brake disc samples according to A.4.2 after the completion of high-load test should not be invalid.
6 test methods
6.1 mechanical properties
6.1.1 Wedge pressure
Wedge-shaped specimen size should be consistent with the provisions of Table 6, test methods according to the provisions of GB/T 9439, take three times the average value of wedge pressure.
Table 6 wedge-shaped specimen requirements
thickness
mm
width
mm
length
mm
Flatness
mm
Roughness Ra
μm
6.0 ± 0.1 20 ≥20, the same sample can be tested many times 0.1 ≤1.6
6.1.2 friction surface hardness
Brake disc friction surface hardness test site should be in the middle of the friction surface, evenly distributed along the circumference of the test at least 3.00. Ventilation disk hardness should be selected
Friction surface just above the rib test. Detection method according to the provisions of GB/T 231.1.
6.2 chemical composition
Chemical composition testing methods according to the provisions of Table 7, but also other methods can also be detected, but the test report should indicate the test method used.
Table 7 chemical composition detection methods
Element detection method
C GB/T 20123
Si GB/T 223.60
Mn GB/T 223.58, GB/T 223.63
P GB/T 223.3, GB/T 223.59, GB/T 223.62
S GB/T 20123
6.3 Metallography
Metallographic specimens should be intercepted from the friction surface, from the inner and outer edges of not less than 5mm, if there are special requirements, may be agreed by both supply and demand.
The test surface of the sample should be radial section. Detection method according to the provisions of GB/T 7216.
6.4 dimensional tolerances and geometric tolerances
Brake disc friction surface beating amount, DTV detection position should be in the friction surface inward 10mm from the outer circumference of the region.
Reference hole diameter tolerance class, ventilation plate thickness changes in the detection of unilateral measures according to GB/T 3177's. Friction surface flatness,
Friction surface beating amount, DTV, flatness of the mounting surface detection method according to the provisions of GB/T 1958.
6.5 friction surface roughness
Brake disc friction surface roughness testing method according to the provisions of GB/T 1031.
6.6 The remaining amount of unbalance
The remaining unbalance detection method according to the provisions of GB/T 9239.
Appendix A.
(Normative)
Brake disc bench test method
A.1 range
This appendix specifies the brake disc thermal fatigue test, high load test bench test methods and failure criteria.
A.2 Test related requirements
A.2.1 Moment of inertia
The actual inertia should be set as close as possible to the theoretical inertia, which should be within ± 5% of the theoretical inertia. Theoretical inertia means, at
The total inertia generated when the vehicle is braked is assigned to the inertia of the corresponding wheel. According to formula (A.1) calculation.
I = M · rdyn2 (A.1)
In the formula.
I --- theoretical moment of inertia, in kilograms per second (kgm2);
M --- test quality (braking, the total mass of vehicles assigned to the corresponding wheel quality), in kilograms (kg);
rdyn --- tire dynamic rolling radius, in meters (m).
A.2.2 test quality
A.2.2.1 The maximum allowable mass less than 7500kg vehicles, test quality according to equation (A.2) or (A.3) calculated.
M = η ×
mveh
2nfront
(A.2)
M = η ×
mveh
2nrear
(A.3)
In the formula.
mveh --- vehicle maximum allowable mass, in kilograms (kg);
nfront --- front axle number;
nrear --- the number of rear axle;
η --- distribution coefficient, according to Table A.1 choice.
Table A.1 Distribution coefficients
Vehicle type front axle rear axle
M1 0.77 0.32
M2 0.69 0.44
N1 0.66 0.39
M3, N2 0.55 0.55
A.2.2.2 The maximum allowable mass greater than or equal to 7500kg vehicles, test quality according to Table A.2 choice.
Table A.2 test quality and tire dynamic rolling radius
Brake disc outer diameter
mm
Test quality
kg
Tire dynamic rolling radius
mm
Rim size
mm
320 ~ 350 3100 386 444.5 (17.5 ")
350 to 390 4500 445 495.3 (19.5 ")
390 to 440 5300 527 571.5 (22.5 ")
Brake disc diameter greater than 440mm test quality, determined by the supply and demand sides negotiated.
A.2.3 cooling wind speed
When the test is carried out without wheels, the cooling air speed shall be limited to Vair = 0.33V0 (V0 =
Speed at the beginning of the move), the wind speed in other cases is not limited.
Cool air to room temperature.
A.2.4 brake pressure rise, buck rate
Test equipment brake line pressure rise, buck rate should meet the following requirements.
a) The pressure brake is 1.5MPa/s ± 0.3MPa/s;
b) Hydraulic brake is 25MPa/s ± 5MPa/s.
A.2.5 sampling rate
Brake line pressure and braking torque sampling rate should be greater than 20Hz.
A.2.6 Temperature measurement
The location of the thermocouple shall be the radius of the friction track at the contact surface of the brake pads. The temperature measurement shall comply with the requirements of QC/T 556.
A.3 Failure Criteria for Sample Failure
During the bench test, the brake disc sample is judged to be ineffective when one of the following phenomena occurs on the brake disc (see Figure A.1).
a) The radial crack length of the friction surface of the brake disc exceeds 2/3 of the width of the friction surface of the brake disc;
b) the brake disc friction surface of the brake disc friction surface reached the inner diameter or outer diameter;
c) there is radial penetration on the brake disk friction surface;
d) Any type of structural damage or crack in any area outside the friction surface.
Figure A.1 Crack types
A.4 Test methods and test conditions
A.4.1 Thermal fatigue test
A.4.1.1 M1, Brake disc for N1 vehicles
Test methods and test conditions for M1 and N1 brake discs are shown in Table A.3.
Table A.3 Test methods and test conditions for thermal fatigue of brake discs for M1 and N1 vehicles
Serial number Test items Test methods and test conditions
1 running in
Brake frequency .100 times
Initial braking speed .60km/h
Braking termination speed .30km/h
Brake deceleration .1m/s2 and 2m/s2 alternately
Brake initial temperature ≤300 ℃ (from room temperature)
2 thermal fatigue test
Brake frequency .2 times (one cycle)
Initial braking speed .80% Vmax (Vmax is the maximum factory design speed, the same below)
Braking termination speed .20km/h
Braking cycle .70s
Brake deceleration .5m/s2
First cycle of each cycle, the initial braking temperature ≤ 100 ℃
After the run-in, if the contact area between the brake disc and the brake pad does not reach more than 80%, continue running in accordance with No. 1 test method and test conditions.
A.4.1.2 Brake discs for M2, M3, N2 and N3 vehicles
Test methods and test conditions of brake discs for M2, M3, N2 and N3 vehicles are shown in Table A.4.
Table A.4 Test Methods and Test Conditions for Thermal Fatigue of Brake Discs for M2, M3, N2 and N3 Vehicles
Serial number Test items Test methods and test conditions
1 running in
Brake frequency .100 times
Initial braking speed .60km/h
Braking termination speed .30km/h
Brake deceleration .1m/s2 and 2m/s2 alternately
Brake initial temperature ≤300 ℃ (from room temperature)
2 first condition brake
Brake frequency .10 times
Initial braking speed .60km/h
Braking termination speed .30km/h
Brake deceleration .1m/s2 and 2m/s2 alternately
Brake initial temperature ≤250 ℃
3 first high-speed brake
Brake frequency .2 times
Initial braking speed .130km/h
Braking termination speed .80km/h
Brake deceleration .3m/s2
Brake initial temperature ≤100 ℃
4 The second condition brake with the same number 2
5 second high-speed brake with the serial number 3
The third condition of braking with serial number 2
7 First constant torque test
Braking times .5 times
Braking speed .85km/h (constant)
Braking torque. Equivalent to 0.5m/s2 brake deceleration
Brake initial temperature ≤ 80 ℃
Braking duration .60s
8 the fourth condition of the same brake with serial number 2
9 second constant torque test
Braking times .5 times
Braking speed .85km/h (constant)
Braking torque. Equivalent to 1m/s2 brake deceleration
Brake initi......
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