QC/T 1099-2018 English PDF (QCT1099-2018)

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QC/T 1099-2018: Specification for collapsible spacer used in automotive drive head assembly
QC/T 1099-2018
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 21
Specification for collapsible spacer used in automotive drive
head assembly
ISSUED ON: JULY 04, 2018
IMPLEMENTED ON: JANUARY 01, 2019
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Technical requirements ... 7
5 Detection method ... 10
Specification for collapsible spacer used in automotive drive
head assembly
1 Scope
1.1 This standard specifies the technical requirements and testing methods for the
collapsible spacer used in automotive drive head assembly.
1.2 This standard is applicable to spacers used in automotive drive head assembly,
which have a total mass not greater than 10000 kg.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 699-2015 Quality carbon structural steels
GB/T 1958 Geometrical product specifications (GPS) - Geometrical tolerance -
Verification
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Collapsible spacer
Collapsible spacers whose middle part adopt a drum-shaped structure, which has
elastic deformation characteristics AND is used in the plastic deformation area.
In this standard, unless there is a special statement, the collapsible spacer is referred
to as the spacer for short.
3.2
Pressure-delta characteristic curve
The relationship between the load (P) and the deformation (δ), when the spacer is
compressed under a certain load, is called mechanical characteristic; the curve (P-δ)
formed by it is called the pressure-delta characteristic curve.
3.3
Pressure-delta characteristic figure
The range, which is allowed by the pressure-delta characteristic curve of the spacer,
is called pressure-delta characteristic figure.
3.4
Springback value (T)
The difference -- BETWEEN the height of the spacer under compression
deformation AND the height after the pressure is released -- is called the springback.
4 Technical requirements
4.1 Materials
4.1.1 The material of the spacer is recommended to use high-quality carbon steel 10,
20, in accordance with the provisions of GB/T 699-2015.
4.1.2 It is allowed to use other materials, that can meet the requirements of this standard.
4.2 Dimensions and tolerances
4.2.1 Refer to Figure 1 for the schematic diagram of spacer type.
5 Detection method
5.1 Geometric tolerance
Geometric tolerances shall be tested in accordance with the provisions of GB/T 1958.
5.2 Performance test
5.2.1 Test requirements
5.2.1.1 Measurement temperature: Measured at room temperature.
5.2.1.2 Pressure testing machine: The pressure range of the equipment is not greater
than 30000 kg; the error of the load measurement indication value shall not be greater
than ±1%.
5.2.1.3 The measurement error of equipment size shall not be greater than ±0.01 mm.
5.2.1.4 Compression speed: 0.5 ~ 1.5 mm/min.
5.2.2 Spacer compression test
As shown in Figure 3, place the spacer at the center of the workbench of the pressure
testing machine. Load the spacer, until the compression deformation is greater than δ2.
Record the load P, corresponding to different compressive deformation δ, including not
less than 10 measurement points; meanwhile it shall include the compressive
deformation value at Pmin and the actual load value under the δ2 compressive
deformation. Draw the pressure-delta characteristic curve of the spacer (see Figure 4).
Figure 3 -- Schematic diagram of spacer compression
Bench
Indenter