JB/T 2985-2016 English PDF (JBT2985-2016)

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JB/T 2985-2016: Bi-metal collar for construction machinery
JB/T 2985-2016
JB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 53.100
P 97
Filing number: 53660-2016
Replacing JB/T 2985-2001
Bi-metal collar for construction machinery
ISSUED ON: JANUARY 15, 2016
IMPLEMENTED ON: JUNE 01, 2016
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Classification and naming ... 5 
3.1 Classification and naming rules ... 5 
3.2 Marking method... 5 
4 Requirements ... 5 
5 Test method ... 8 
6 Inspection rules ... 8 
6.1 Exit-factory inspection ... 8 
6.2 Type inspection ... 9 
7 Marking, packaging, transportation and storage ... 9 
Appendix A (Informative) Metallographic structure of the alloy layer of collar
(100 x) ... 11 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JB/T 2985-2001 "Bi-metal collar for construction
machinery". Compared with JB/T 2985-2001, the main technical changes are
as follows:
- MODIFY the scope of application of bi-metal collar (see Chapter 1; Chapter
1 of the 2001 edition);
- REPLACE part of the normative references in the normative references
(see Chapter 2; Chapter 2 of the 2001 edition);
- MODIFY the marking method of bi-metal collar (see 3.2; 3.2 in 2001 edition);
- ADD the requirements for the geometric tolerance level of bi-metal collar
(see 4.3);
- MODIFY the drawing of the bi-metal collar (see Figure 1; Figure 1 and
Figure 2 of the 2001 edition);
- MODIFY the main dimensions of the bi-metal collar (see Table 4; Table 4
and Table 5 of the 2001 edition);
- ADD the requirements for the tensile breaking load of the bi-metal collar
sleeve and the thrust side (see 4.8);
- ADD and MODIFY the test method of bi-metal collar (see Chapter 5;
Chapter 5 of the 2001 edition);
- MODIFY and ADD the packaging requirements for bi-metal collar (see 7.3
and 7.6; 7.3 and 7.6 of the 2001 edition).
This standard was proposed by China Machinery Industry Federation.
This standard shall be under the jurisdiction of the National Earthmoving
Machinery Standardization Technical Committee (SAC/TC 334).
Drafting organizations of this standard: Jizhong Bearing Co., Ltd., Tianjin
Construction Machinery Research Institute.
The main drafters of this standard: Men Baojian, Men Xiaoxin, Li Guangqing.
This standard replaces the standard previously issued as follows:
- JB/T 2985-1993, JB/T 2985-2001.
Bi-metal collar for construction machinery
1 Scope
This standard specifies the classification, naming, requirements, test methods,
inspection rules, markings, packaging, transportation and storage of bi-metal
collar for crawler construction machinery.
This standard applies to the bi-metal collar (hereinafter referred to as collar) of
the supporting wheels, guide wheels and other transmission parts of the
walking mechanism of crawler construction machinery.
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 228.1 Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 699 Quality carbon structural steels
GB/T 1174 Cast bearing metals
GB/T 1958 Geometrical product specifications (GPS) - Geometrical
tolerance - Verification prescription
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 3260.4 Methods for chemical analysis of tin - Part 4: Determination of
lead content - Flame atomic absorption spectrometric method
GB/T 3850 Impermeable sintered metal materials and hard metals -
Determination of density
GB/T 4103.1 Methods for chemical analysis of lead and lead alloys - Part 1:
Determination of tin content
4.8 The tensile breaking load of the collar and thrust side shall be above 98 kN.
4.9 The alloy layer of the collar shall be dense, free of defects such as cracks,
pinholes, rust and foreign inclusions; the inner surface shall be smooth, without
scratches, bruises and indentations.
4.10 There shall be no pits or other defects on the surface of the steel layer.
5 Test method
5.1 The chemical composition of the alloy layer of the sleeve shall be inspected
in accordance with the provisions of GB/T 3260.4 and GB/T 4103.1.
5.2 The hardness of the alloy layer of the collar shall be inspected according to
the provisions of JB/T 231.1.
5.3 The metallographic structure of the alloy layer of the collar shall be
inspected in accordance with the provisions of GB/T 13298.
5.4 The density of the alloy layer of the sintered collar shall be inspected in
accordance with the provisions of GB/T 3850.
5.5 The outer and inner diameters of the sintered rolled collar shall be inspected
in accordance with the provisions of GB/T 12613 (all parts).
5.6 The thickness of the alloy layer of the collar shall be measured on the radial
section of the collar by a non-magnetic thickness gauge. The position of the
cross-section shall be in accordance with the provisions of GB/T 1958.
5.7 The geometric tolerance of the collar shall be inspected in accordance with
the provisions of GB/T 1958.
5.8 The welding strength of the collar and the thrust edge shall be inspected in
accordance with the provisions of GB/T 228.1.
5.9 The bond strength between the collar steel layer and the alloy layer shall be
inspected in accordance with the provisions of GB/T 228.1 and GB/T 1174.
6 Inspection rules
6.1 Exit-factory inspection
Each collar must be inspected by the manufacturer's inspection department
before leaving the factory. The inspection items include inner diameter, outer
diameter, thrust ring thickness, alloy layer thickness, surface quality. The
b) Product name and product specifications;
c) Quantity and mass;
d) Date of production.
7.4 Each packing box shall be accompanied by a certificate of conformity
stamped by the inspector of the manufacturer's quality inspection department.
7.5 Put the packing box which packs the collar into a dry packing carton lined
with waterproof paper. There shall be protective fillers in the carton, to ensure
that the parts will not be damaged during normal transportation.
7.6 The outer surface of the packing carton shall at least be marked with:
a) Manufacturer's name, address and telephone number;
b) Product name and product specifications;
c) Quantity and total mass;
d) Signs such as "Handle with care", "avoid moisture", "avoid pressure",
"height restrictions";
e) Packing date.
7.7 The collars packed in cartons shall be stored in a ventilated and dry
warehouse. Under normal storage conditions, the manufacturer shall ensure
that the collar is free of corrosion within 12 months from the date of exit-factory.