QC/T 1140-2020 English PDF (QCT1140-2020)

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QC/T 1140-2020: Technical Specifications for Remanufactured Automotive Components – Crankshaft
QC/T 1140-2020
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.10
T 12
Technical Specifications for Remanufactured
Automotive Components – Crankshaft
ISSUED ON: DECEMBER 09, 2020
IMPLEMENTED ON: APRIL 01, 2021
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 6
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Process Requirements ... 8
5 Performance Requirements ... 11
6 Test Methods ... 13
7 Inspection Rules ... 14
8 Marking, Packaging, Transportation and Storage ... 14
Appendix A (Informative) Production Process of Auto Parts Remanufactured
Products ... 16
Technical Specifications for Remanufactured
Automotive Components – Crankshaft
1 Scope
This document specifies the terms and definitions, process requirements, performance
requirements, test methods, inspection rules, marking, packaging, transportation, and
storage for the remanufactured products of automotive engine crankshaft.
This document is applicable to remanufactured products of automotive engine
crankshafts.
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 document.
GB/T 1031 Geometrical Product Specifications (GPS) - Surface Texture: Profile
Method - Surface Roughness Parameters and their Values
GB/T 1184-1996 Geometrical Tolerancing - Geometrical Tolerance for Features
without Individual Tolerance Indications
GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical Tolerance -
Verification
GB/T 6809.3 Reciprocating Internal Combustion Engines - Vocabulary of
Components and Systems - Part 3: Main Running Gear
GB 22128 Technical Specifications for End-of-Life Vehicles Collecting and
Dismantling Enterprises
GB/T 26989 Automobile Recovery - Terminology
GB/T 28675 Remanufacturing of Automotive Components - Disassembly
GB/T 28676-2012 Remanufacturing of Automotive Components – Classification
GB/T 28677 Remanufacturing of Automotive Components - Cleaning
classified, repaired and assembled, the performance indicators shall meet the
requirements specified in Clause 5.
4.1.2 The production process of remanufactured products is shown in Figure A.1 of the
Appendix.
4.2 Disassembly requirements
4.2.1 The disassembly of the crankshaft shall comply with the provisions of GB/T
28675.
4.2.2 Removable crankshaft accessories such as balance weights, oil plugs, flanges,
gears, keys, etc. shall be removed to make them into a single part state.
4.2.3 Avoid damaging parts when disassembling.
4.2.4 When disassembling a crankshaft equipped with a separate balance weight, the
corresponding mark shall be made before disassembling.
4.3 Cleaning requirements
The cleaning of the crankshaft after disassembly shall comply with the provisions of
GB/T 28677; and the oil dirt and sediment in the oil passage shall be thoroughly
removed.
4.4 Testing and classification requirements
4.4.1 Testing requirements
4.4.1.1 Appearance inspection
Visually inspect the surface condition of each journal of the crankshaft, and check
whether there are defects such as cracks, scratches or strains, and threaded holes
and thread wear.
4.4.1.2 Size inspection
According to the requirements of the original design drawings, use a general
measuring tool or a three-coordinate measuring instrument to detect the geometric
accuracy of the crankshaft journal dimensional tolerance and form and position
tolerance; and make a record. The dimensions to be inspected are as follows:
a) Dimensions of crankshaft journals;
b) The amount of runout of the spindle centreline;
c) The parallelism of the main journal and the centreline of the connecting rod
journal;
5.5 Magnetic particle testing
The remanufactured crankshaft shall be subjected to magnetic particle testing in
accordance with the provisions of 6.5; and cracks shall not be detected.
5.6 Cleanliness
After removing metal chips and debris in the crankshaft lubricating oil passage and
other positions, the cleanliness of the crankshaft shall meet the requirements of the
manufacturer for the entire machine.
6 Test Methods
6.1 Surface hardness
The hardness of the remanufactured crankshaft shall be measured according to the
method specified in QC/T 481.
6.2 Surface roughness
The surface roughness of the remanufactured crankshaft journal shall be measured
according to the method specified in QC/T 481.
6.3 Dimensional and geometrical tolerances
6.3.1 When the length of the crankshaft is greater than 1.5m and the number of cranks
is more than 6, intermediate auxiliary supports are allowed during the measurement
process.
6.3.2 The geometric tolerances of the processed positions of the remanufactured
crankshaft shall be inspected according to the methods specified in GB/T 1958.
6.4 Dynamic balance
The dynamic balance of the crankshaft shall be inspected according to the method
specified in QC/T 481.
6.5 Magnetic particle testing
Magnetic particle testing of the crankshaft shall be carried out in accordance with the
provisions of JB/T 6729.
6.6 Cleanliness
The cleanliness of the crankshaft shall be measured in accordance with the provisions
of QC/T 481.
of GB/T 28678-2012.
8.1.2 The remanufactured product code shall be marked on the remanufactured
crankshaft.
8.1.3 The remanufactured product mark shall be on the outer packaging of the
remanufactured crankshaft that is sold separately.
8.2 Packaging
8.2.1 The packaging of the remanufactured crankshaft shall comply with the provisions
of GB/T 28678-2012.
8.2.2 Before packaging the remanufacturing the crankshaft, it shall be cleaned again
for anti-corrosion treatment.
8.2.3 Measures shall be taken to prevent moisture, and a fixing frame shall be set in
the packing box to prevent the crankshaft from shaking and deforming.
8.3 Transportation
During transportation, rain-proof, moisture-proof and protective measures shall be
taken to prevent the product from being damp, bumped, deformed, and damaged.
8.4 Storage
The storage and transportation environment of the remanufactured crankshaft shall be
kept ventilated, dry, and clean. The unpackaged crankshaft shall be placed on the
bracket or placed upright to prevent deformation and damage. The manufacturer shall
ensure that the product shall not rust within 12 months from the date of leaving the
factory.