GB/T 34422-2017 (GBT 34422-2017)

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GB/T 34422-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
T 24
Brake disc for automobile
ISSUED ON. OCTOBER 14, 2017
IMPLEMENTED ON. MAY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope .. 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Classification .. 6 
5 Technical requirements ... 7 
6 Inspection method ... 11 
Annex A (Normative) Brake disc bench test method ... 13 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by Ministry of Industry and Information Technology
of the People's Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee
on Automobiles of Standardization Administration of China (SAC/TC 114).
The drafting organizations of this Standard. National Motor Vehicle Parts
Product Quality Supervision and Inspection Center, Yantai Resort Auto Parts
Manufacturing Co., Ltd., Laizhou Sanli Auto Parts Co., Ltd., Yantai Mei Fung
Machinery Co., Ltd., Longkou Yu Tung Machinery Factory, Shandong Longji
Machinery Co., Ltd.
Main drafters of this Standard. Li Hong, Zheng Yunxia, Zhou Hongtao, Cui
Lanfang, Zhang Baozhi, Wang Ping, Wang Song, Sun Zhenlin, Yang Weirao.
Brake disc for automobile
1 Scope
This Standard specifies the terms and definitions, classification, technical
requirements, inspection methods of brake disc for automobile (hereinafter
referred to as “brake disc”).
This Standard applies to brake disc used for M and N class automobile brakes
specified in GB/T 15089-2001 of which the body material is gray cast iron. The
brake disc made of other material shall refer to this for implementation.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 223.3, Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the
determination of phosphorus content
GB/T 223.58, Methods for chemical analysis of iron, steel and alloy - The
extraction-absorption catalytic polarographic method for the determination of
manganese content
GB/T 223.59, Iron, steel and alloy - Determination of phosphorus content-
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
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 photometric method for the determination of phosphorus
content
GB/T 223.63, Methods for chemical analysis of iron, steel and alloy - The
sodium (potassium) periodate photometric method for the determination of
manganese content
GB/T 231.1, Metallic materials - Brinell hardness test - Part 1. Test method
GB/T 1031, Geometrical product specifications(GPS) - Surface texture.
Profile method - Surface roughness parameters and their values
GB/T 1958, Geometrical product Specifications (GPS) - Geometrical
tolerance - Verification prescription
GB/T 3177, Inspection of plain workpiece sizes
GB/T 7216, Hygienic requirements for peacetime utilization of civil air
defence works
GB/T 9239 (all parts), Balance quality of rigid rotors - Determination of
permissible residual unbalance
GB/T 9439, Grey iron castings
GB/T 15089-2001, Classification of power-driven vehicles and trailers
GB/T 20123, Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace
QC/T 556, Automotive brake temperature measurement and thermocouple
mounted
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 ventilated disc
the brake disc with a ventilation duct between two friction surfaces
3.2 solid disc
the brake disc without a ventilation duct between two friction surfaces
3.3 mounting surface
the surface mounted on the hub and fitted with the hub; the mounting reference
surface of brake disc
3.4 disc thickness variation; DTV
the variation of the thickness of two friction surfaces on either circumference
3.5 minimum thickness
disc for test; the number of cycles of thermal fatigue test of two samples
shall exceed 100.
5.10.1.2 M2, M3, N2 and N3 vehicle brake disc samples shall be tested
according to A.4.1.1. It shall meet the following requirements.
a) the number of thermal fatigue test cycles at the failure of the brake disc
sample is greater than or equal to 15, or
b) when the number of cycles of thermal fatigue test on the failure of a brake
disc sample is more than 10 but less than 15, then use a new sample of
the brake disc for test.
5.10.2 High-load test
The brake disc sample shall not be invalid after it completes the high-load test
according to A.4.2.
6 Inspection method
6.1 Mechanical properties
6.1.1 Wedge pressure strength
Wedge sample size shall comply with the provisions of Table 6. The inspection
methods are in accordance with the provisions of GB/T 9439. Take the average
value of three wedge pressure strengths.
Table 6 -- Wedge sample 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
The test site of brake disc friction surface hardness shall be in the middle of the
friction surface. Test at least 3 points evenly along with circumference. The
hardness of ventilated disc shall be tested on the friction surface right above
the rib. The test method is in accordance with GB/T 231.1.
6.2 Chemical composition
The test method for chemical composition is in accordance with Table 7. It may
use other methods. But the test method used shall be indicated in the test report.
nfront - number of front axles;
nrear - number of rear axle;
η - partition coefficient, selected according to Table A.1.
Table A.1 -- Partition coefficient
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 For the vehicle with maximum allowable mass greater than or equal
to 7500kg, the test mass shall be selected according to Table A.2.
Table A.2 -- Test mass and dynamic rolling radius of tire
Brake disc outer
diameter
mm
Test mass
kg
Dynamic rolling
radius of tire
mm
Rim size
mm
320~350 3100 386 444.5 (17.5’’)
350~390 4500 445 495.3 (19.5’’)
390~440 5300 527 571.5 (22.5’’)
The test mass of which brake disc outer diameter is greater than 440mm shall be
determined by both parties based on negotiation.
A.2.3 Cooling wind speed
Test without the wheel. During braking, or between two braking, the cooling
wind speed shall be limited to Vair = 0.33V0 (V0 is the vehicle speed at the start
of braking). The wind speed in other cases is not limited.
Cool air to room temperature.
A.2.4 Boost rate, buck rate of brake pressure
The boost rate, buck rate of brake line pressure of test equipment shall meet
the following requirements.
a) Air brake is 1.5 MPa/s ± 0.3 MPa/s;
b) Hydraulic brake is 25 MPa/s ± 5 MPa/s.
A.2.5 Sampling rate
The sampling rate of brake line pressure and braking torque shall be greater
than 20Hz.