JB/T 2985-2001 This standard is a revision of JB/T 2985-1993 "Bimetallic Bushings for Construction Machinery". During the revision, the chemical composition of the alloy layer was modified; the detection of the thickness of the alloy layer was added; and the specifications and models of the products were expanded. This standard specifies the technical requirements, test methods, inspection rules, packaging and transportation of bimetallic bushings for crawler-type construction machinery. This standard applies to bimetallic bushings for supporting wheels, guide wheels and other transmission parts of the traveling mechanisms of crawler bulldozers, excavators, loaders, etc. This standard was first issued in July 1987, revised for the first time in 1993, and this is the second revision. JB/T 2985-2001 Bimetallic Bushings for Construction Machinery JB/T2985-2001 Standard download decompression password: www.bzxz.net

ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T2985—2001www.bzxz.net
Bimetallic Bushings for Construction Machinery
Constructionmachinery-Bi-metalcollar2001-03-04 Issued
China Machinery Industry Federation
2001-10-01 Implementation
JB/T2985—2001
This standard is a revision of JB/T29851993 "Bimetallic Bushings for Construction Machinery". Compared with JB/T29851993, the main technical content of this standard has been changed as follows:
The chemical composition of the alloy layer of the shaft sleeve has been modified, and the sum of impurities such as zinc, iron, and nickel is ≤1.0%. The thickness of the alloy layer has been tested;
- Expanded product specifications and models
This standard will replace JB/T2985-1993 from the date of implementation. This standard was proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. The drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Baoding Jizhong Bearing Factory. The main drafters of this standard are: Yang Chengshan, Men Baojian. This standard was first issued in July 1986, revised for the first time in 1993, and this is the second revision. 1 Scope
Machinery Industry Standard of the People's Republic of China
Bi-metal collar for construction machinery
Construction madhinary Bi-metal collar JB/T2985—2001
Replaces JBT29851993
This standard specifies the technical requirements, test methods, inspection rules, packaging and transportation of bi-metal collars for crawler construction machinery. This standard applies to bi-metal collars (hereinafter referred to as collars) for supporting wheels, guide wheels and other transmission parts of the traveling mechanisms of crawler pushers, excavators, loaders, etc.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 6991999
GB/T1958—1980
GB/T2828—1987
GB/T3850—1983
GB/T126131990
JB/T7925.2—1995
3 Classification and naming
High-quality carbon structural steel
Provisions for shape and position tolerance inspection
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) Density determination method of dense sintered metal materials and cemented carbides Sliding bearings, rolled sleeves
Sliding bearings Multi-layer bearings Anti-friction alloy hardness test method Sleeves are classified and named according to the production process of the alloy layer, see Table 1. Table 1
Sintering process
Centrifugal casting process
3.2 Marking method
3.2.1 The sleeve marking consists of the following parts
China Machinery Industry Federation 2001-03-04 Approval name
Sintered sleeve
Cast sleeve
Standard number
Process code
Sleeve length, mm
Inner diameter,
Process code
1 Implementation
3.2.2 Marking example
JB/T2985-2001
The bimetallic sleeve of centrifugal casting process with A-type structure, inner diameter 60mm and sleeve length 90mm is marked as: sleeve A60X90LJB/T2985—2001
4 Technical requirements
4.1 The product shall be manufactured according to the drawings and technical documents approved by the prescribed procedures and shall comply with the provisions of this standard. 4.2 Materials
4.2.1 Steel layer
4.2.1.1 The steel layer of the bimetallic sleeve of the casting process shall be 08F, 08, 10, 15 steel specified in GB/T699—1999. 4.2.1.2 For the bimetallic sleeves made by sintering process, the steel layer shall be 08, 10, 08F steel and 08AL steel specified in GB/T699-1999. Hot-rolled steel strip or steel plate shall be used for sintered coiled sleeves with a wall thickness greater than or equal to 3.5 mm; cold-rolled steel strip or steel plate shall be used for sintered coiled sleeves with a wall thickness less than 3.5 mm.
4.2.1.3 The hardness of the steel layer shall be 125~200HB. 4.2.2 Alloy layer
4.2.2.1 The grade and chemical composition of the sleeve alloy layer shall comply with the provisions of Table 2. Table 2
Sleeve alloy layer grade
CuPb10Snl0
GuSn7Pb7Zn3
The hardness and density of the sleeve alloy layer shall comply with the provisions of Table 3. Table 3
Alloy layer grades of shaft sleeves
CuPb10Sn10
CuSn7Pb7Zn3
Note: CuPb10Sn10 material is preferred
Hardness HB
70~130
Density g/mm2
4.2.2.3The metallographic structure of the shaft sleeve alloy layer shall be above Grade 2 in the metallographic picture in Appendix A (Appendix of the Standard). 4.3The main dimensions of the shaft sleeve shall comply with the provisions of Figure 1 (Type A), Figure 2 (Type B) and Table 4 (Type A), Table 5 (Type B) or the provisions of the relevant drawings.
JB/T2985—2001
4.4The geometric tolerances and surface roughness of the shaft sleeve (including the bimetallic shaft sleeve without thrust edge) shall comply with the provisions of Figure 1 or Figure 2. 8A
Figure 1A-type shaft sleeve
Figure 2B-type shaft sleeve
Table 4A-type shaft sleeve
JB/T2985-2001
B-type shaft sleeve
4.5The alloy layer of the shaft sleeve shall be firmly bonded to the steel layer, and the bonding strength between the steel layer and the alloy layer shall not be less than 88MPa. mm
4.6The thickness of the shaft sleeve alloy layer is 0.7mm±0.2mm, and the difference between the maximum and minimum values ​​of the alloy layer thickness on the same shaft sleeve shall not exceed 0.25mm
4.7The joint of the sintered shaft sleeve adopts a straight seam or buckle type, and a punching fillet is allowed at the joint. 4.8The alloy layer of the shaft sleeve shall be dense, without defects such as cracks, pinholes, rust and foreign inclusions, and the inner surface shall be smooth, without scratches, bumps and indentations.
There shall be no welding pit defects on the surface of the steel layer. 4.9
5Test method
The chemical composition of the sleeve alloy layer shall be tested by spectrophotometer or titration. The hardness test of the sleeve alloy layer shall be carried out in accordance with the provisions of JB/T7925.2. The metallographic structure of the sleeve alloy layer shall be tested by metallographic microscope. 5.4
The inspection of the density of the sintering process sleeve alloy layer shall be in accordance with the provisions of GB/T3850. The inspection of the outer diameter and inner diameter of the sintered and rolled sleeve shall be in accordance with the provisions of GB/T12613. 5.5
5.6The thickness of the sleeve alloy layer shall be measured on the radial section of the sleeve by a non-magnetic thickness gauge, and the position of the section shall be in accordance with the provisions of GB/T12613.
5.7The shape and position tolerance of the sleeve shall be inspected in accordance with the GB/T1958 inspection method. 5.8 Bonding test between the steel layer and the alloy layer of the sleeve 5.8.1 Nondestructive test
Mainly by listening. When tapping the steel layer of the sleeve, the sound should be crisp and loud, and there should be no mute sound. 5.8.2 Destructive test
5.8.2.1 Bending method
First, unfold the sleeve and flatten it, then continue to press it to 90°, and then return to flattening. The alloy layer is allowed to have cracks, but the alloy layer is not allowed to separate from the steel layer.
2 Determination of bonding strength
The test specimen and device are shown in Figures 3 and 4. 4
JB/T2985—2001
The determination of the bonding strength of the bimetallic sleeve should be carried out on a 5~20kN universal material testing machine. During the test, the load is applied to the sample steadily and slowly, with a stress increase of 10N/(mm2·s), until the alloy layer is torn or torn off from the steel layer. At this time, the value indicated on the dynamometer of the testing machine is the maximum test load, and the bonding strength of the bimetallic sleeve is calculated according to the following formula. At the same time, the test conditions, damaged parts, damage forms and manufacturing defects should be recorded. In the formula: Reh bonding strength, MPa;
maximum test load, N
A total bonding area, mm.
6 Inspection rules
6.1 Factory inspection
Each sleeve must be inspected and qualified by the inspection department of the manufacturer before it can be shipped. The inspection items include inner diameter, outer diameter, thrust ring thickness and alloy layer thickness, alloy layer thickness difference, surface roughness, and surface quality. The chemical composition and metallographic structure of the alloy layer shall be sampled and inspected in accordance with the provisions of 5.2.
Type inspection
JB/T2985-—2001
The items for type inspection of bimetallic sleeves shall be in accordance with the provisions of Table 6. Sampling inspection shall be carried out in accordance with the provisions of GB/T2828, and a single sampling plan shall be adopted. Under normal circumstances, the inspection batch N is 51~90, and the inspection level and qualified quality level (AQL) shall be in accordance with the provisions of Table 6, or determined by negotiation between the supply and demand parties. During the inspection, if the number of unqualified items for each item is equal to or less than the corresponding qualified judgment number (Ac), the batch of products shall be accepted, otherwise it shall be rejected. Table 6
Inspection items
Thickness of thrust ring
Chemical composition of alloy layer
Adhesion strength of alloy layer
Metallographic structure of alloy layer
Thickness of alloy layer
Thickness difference of alloy layer
Other shapes and dimensions
Geometric tolerance
Surface roughness
Surface quality
7 Marking, packaging, transportation and storage
7.1 Each sleeve shall be marked with the manufacturer’s mark, product model and standard number. AQL
Inspection Level
General Inspection Level ⅡI
Special Inspection Level S-2
General Inspection Level ⅢI
7.2 Each sleeve must be cleaned and treated with corrosion protection before packaging, and wrapped with strong and impermeable neutral paper or plastic film before being packed into a packaging box. Each box should contain sleeves of the same size and of the same model. 7.3 The outer surface of the packaging box should be marked with:
a) Manufacturer's name, zip code, address and telephone number; b) Product name and product specifications:
c) Quantity and quality:
d) Packing date.
7.4 Each packaging box should be accompanied by a certificate signed by the inspector of the manufacturer's quality inspection department. 7.5 The sleeves packed in the packaging box should be placed in a dry packaging box lined with waterproof paper. The box should have protective fillings to ensure that the parts will not be damaged during normal transportation.
7.6 The outer surface of the packing box should be marked with:
a) Manufacturer's name and address;
b) Product name, product specifications;
Quantity and total weight;
d) "Handle with care", "Moisture-proof", "Pressure-proof" and other signs; 6
e) Packing date.
JB/T2985—2001
7.7 The packed sleeves should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the sleeves are free of rust within 12 months from the date of leaving the factory.
Figure A11 level
JB/T2985—2001
Appendix A
(Appendix to the standard)
Metallographic diagram of alloy layer (×100)
Figure A33 level
Figure A22 level
Mechanical industry standard
Bimetallic bushings for engineering machinery
JB/T2985-2001
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute| |tt||(No. 2, Shouti South Road, Beijing, Postal Code 100044)*
Book size 880×12301/16 Printing sheet 3/4
4 Word count 18000
First printing in August 2001
Edition in August 2001
Print run 1-500
Price 1200 yuan
2001-016
Mechanical Industry Standard Service Network: http/wwwJB.ac.cn1002862
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