HOME   Cart(2)   Quotation   About-Us Tax PDFs Standard-List
Powered by Google-Search & Google-Books www.ChineseStandard.net Database: 189759 (22 Jan 2023)

QC/T 293-2019 (QCT 293-2019)

Chinese standards (related to): 'QC/T 293-2019'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)See DetailStatusGoogle Book
QC/T 293-2019English170 Add to Cart 0--3 minutes. Auto immediate delivery. Specifications and bench test methods of automotive axle shaft QC/T 293-2019 Valid QCT 293-2019
QC/T 293-1999English349 Add to Cart 3 days Test methods of automotive axle shaft QC/T 293-1999 Obsolete QCT 293-1999


   
BASIC DATA
Standard ID QC/T 293-2019 (QC/T293-2019)
Description (Translated English) Specifications and bench test methods of automotive axle shaft
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T21
Classification of International Standard 43.040.50
Word Count Estimation 17,184
Date of Issue 2019
Date of Implementation 2020-04-01
Summary This standard specifies the technical conditions and bench test methods for automobile axle shafts. This standard applies to the full-floating axle shafts and semi-floating axle shafts of non-steering drive axles (except the axle shafts for mining vehicles).


QC/T 293-2019: PDF in English (QCT 293-2019)
QC/T 293-2019
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 21
Replacing QC/T 293-1999, QC/T 294-1999
Specifications and bench test methods of automotive
axle shaft
ISSUED ON: NOVEMBER 11, 2019
IMPLEMENTED ON: APRIL 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 5 
1 Scope ... 8 
2 Normative references ... 8 
3 Terms and definitions ... 8 
4 Technical requirements ... 12 
5 Test methods ... 14 
Specifications and bench test methods of automotive
axle shaft
1 Scope
This standard specifies the technical conditions and bench test methods for
automotive axle shafts.
This standard applies to full-floating axle shafts and semi-floating axle shafts of
non-steering drive axles (except for vehicle axles for mining purposes).
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 3077 Alloy structure steels
GB/T 5216 Structural steels with specified hardenability bands
GB/T 5617 Determination of effective depth of hardening after induction or
flame hardening of steel
GB/T 13320 Metallographic grading atlas and assessing method for steel die
forgings
JB/T 9204 Metallographic examination of induction hardened steel parts
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Axle shaft
The shaft, which transmits the torque from the differential or the main reducer,
to the wheel or the driving gear of the wheel side reducer, some of which
may also be subject to the bending moment.
4 Technical requirements
4.1 General technical requirements
4.1.1 The axle shaft shall be produced, according to the product drawings and
technical documents.
4.1.2 Axle shaft material
Under the condition of ensuring product design performance requirements, the
axle shaft material shall meet the relevant requirements of chemical
composition and mechanical properties, which are required in GB/T 3077 and
GB/T 5216. The recommended designations are 40Cr, 40CrH, 42CrMo,
42CrMoH, 40MnB, 40MnBH, 50CrV, 50CrVA. Other materials that meet the
requirements of this standard are also allowed.
4.1.3 Heat treatment requirements for axle shafts
The intermediate frequency quenching process on the surface after pre-
quenching and tempering treatment is recommended, for the axle shaft's heat
treatment process. Under the condition that the performance index of the axle
shaft is guaranteed, it is also allowed to use other heat treatment processes,
such as surface intermediate frequency quenching after normalizing treatment.
The axle shaft's heat treatment process should meet the following requirements:
a) The recommended value of the hardness, at the center of the axle shaft,
after pre-conditioning and tempering treatment, is 24HRC ~ 30 HRC;
b) The recommended value of the core hardness, after pre-conditioning and
tempering treatment of axle shafts, which are made of 42CrMo and
42CrMoH, is 28HRC ~ 36HRC;
c) The hardness of the semi-floating axle shaft flange is 180HB ~ 240HB;
d) After the intermediate frequency quenching of the axle shaft, the surface
hardness of the rod shall not be lower than 52HRC; however, at the spline,
it is allowed to reduce 3 hardness units. The effective hardened layer's
depth of the rod is 10% ~ 20% of the rod diameter; the change in the
effective depth of the hardened layer, at the same section of the rod, is not
more than 5% of the diameter of the rod;
e) The depth of the effective hardened layer, at the fillet R at the root of the
axle shaft flange, is measured along the 45° direction of the fillet R. The
effective depth of the hardened layer, at this point, is not less than 5% of
the diameter at the root of the axle shaft's flange; it is not more than the
upper limit of the effective hardened layer depth of rod after quenching;
f) The effective depth of the quenched hardened layer, at the spline, is
measured from the minor diameter of the spline; its depth shall not be less
than 10% of the major diameter of the spline;
g) The maximum length of the non-quenched area of the axle shaft's spline,
which is measured from the end of the axle shaft's spline, is 10 mm.
4.1.4 Dimensions of the spline of axle shaft
The spline shall be inspected by a comprehensive gauge OR subject to a
single-time inspection. The cumulative tolerance, tooth shape tolerance, tooth
direction tolerance of the spline teeth shall meet the requirements of the product
drawing.
4.1.5 Magnetic flaw detection of axle shaft
The axle shaft shall be demagnetized, after magnetic flaw detection.
4.1.6 Surface quality of axle shaft
The non-machined surface of the axle shaft is allowed to have traces of
cleaning defects; the depth of the traces after cleaning is not more than 0.5 mm.
The same cross-section of the rod is not allowed to have more than two traces
of cleaning defects. The rest of the surface shall be free of defects, such as
folds, dents, smashed marks.
4.2 Inspection requirements
4.2.1 Axle shaft pre-conditioning hardness and metallographic structure
inspection
The inspection point of the pre-conditioning hardness of full-floating axle shaft
is at the flange of the axle shaft. The inspection point of the quenched and
tempered hardness of the semi-floating axle shaft and the flange-free full-
floating axle shaft, is the 1/2 radius of the rod. If the inspection point is the heat-
affected zone after quenching treatment, it may carry out inspection, at a
position beyond the heat-affected zone. The pre-quenched and tempered
metallographic structure of the axle shaft shall be inspected, according to the
inspection method specified in GB/T 13320.
4.2.2 The depth of the effective hardened layer after the intermediate frequency
quenching on the surface of the axle shaft and the metallographic structure
inspection
The depth of the effective hardened layer, after the intermediate frequency
quenching of the axle shaft, shall be inspected, according to the inspection
method specified in GB/T 5617. The metallographic structure of the
......