JB/T 9763-1999 This standard is a revision of ZB J92 004-87 "Inspection Standard for Precision Electroplated Anti-friction Bearings for Internal Combustion Engines". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the code, technical requirements, inspection rules and inspection methods for precision electroplated anti-friction bearings for internal combustion engines. This standard is applicable to the quality inspection of precision electroplated anti-friction bearings for reciprocating internal combustion engines with a cylinder diameter of less than or equal to 200mm. This standard was first issued in 1987. JB/T 9763-1999 Inspection Specification for Precision Electroplated Anti-friction Bearings for Internal Combustion Engines JB/T9763-1999 Standard download decompression password: www.bzxz.net

JB/T9763-1999
This standard is a revision of ZBJ92 00487 "Test Standard for Precision Electroplated Anti-friction Layer Bearings for Internal Combustion Engines". Editorial changes were made to the original standard during the revision, and the main technical content remained unchanged. This standard replaces ZBJ92004-87 from the date of implementation. This standard was proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. The drafting unit of this standard: Shanghai Internal Combustion Engine Research Institute. The main drafters of this standard: Bao Xidi and Li Guoen. This standard was first issued in 1987.
Standard of the Machinery Industry of the People's Republic of China
Precision Electroplating Anti-friction Overlay Bearing
Internal Combustion Engines,
Inspection Specifications
Internal Combustion Engines---Bearing with Precision Plating Anti-friction Overlay-Examination SpecificationsJB/T9763—1999
Replaces ZBJ92004-—87
This standard specifies the code, technical requirements, inspection rules and inspection methods for precision electroplating anti-friction overlay bearings for internal combustion engines. This standard is applicable to the quality inspection of precision electroplating anti-friction overlay bearings for reciprocating internal combustion engines with a cylinder diameter of less than 200mm. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1151--1993 Technical conditions for main bearings and connecting rod bearings for internal combustion engines GB/T2828--1987 Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) 3 Names and codes of various parts of precision electroplated friction reduction layer bearings The names and codes of various parts of precision electroplated friction reduction layer bearings are shown in Table 1 and Figure 1. Table 1
Bearing shell outer diameter
Semicircle circumference tolerance
Bearing shell width
Bearing shell wall thickness
Thickness of electroplated anti-friction layer
Thickness of alloy layer at the bottom of bearing shell
Thickness of steel back
Approved by the State Machinery Industry Bureau on 1999-09-17 214
Inner circle surfacewww.bzxz.net
Location lip
Butt surface
Steel back surface
Elastic tensor
Implementation on 2000-01-01
4 Technical requirements
4.1 Chemical composition of electroplated anti-friction layer
JB/T 9763—1999
Lead-tin alloy (Pb-10Sn): containing 8%~12% tin, lead balance, lead-tin-copper alloy (Pb-10Sn-2Cu): containing 8%~12% tin, 1%~3% copper, lead balance. Lead-steel alloy (Pb-8In), containing 7%~9% indium, lead balance. 4.2 Thickness of electroplated anti-friction layer
4.2.1 The thickness of the electroplated anti-friction layer varies between 0.01~0.05mm, and is selected according to the following three thicknesses: 0. 01~0. 02 mm,
0. 02- 0. 03 mm,
0. 03~0. 05 mm.
4.2.2 The total wall thickness tolerance of the bearing before electroplating is ±0.004mm. 4.2.3 The total wall thickness tolerance of the bearing after electroplating is shown in Table 2. Table 2
Bearing outer diameter
>45～75
>75～110
>110～200
Wall thickness tolerance
4.2.4 If a smaller wall thickness tolerance of the bearing is required, the electroplated anti-friction layer must be plated twice as thick, and then the inner circle must be rebored to achieve the required wall thickness. 4.3 Bonding strength of electroplated anti-friction layer and bottom alloy layer The electroplated anti-friction layer and the bottom alloy layer must not be separated, and their bonding strength must meet the requirements of the peeling test, see 8.4. 4.4 Hardness value of electroplated anti-friction layer
The electroplated anti-friction layer of lead-tin alloy is 8～10HV25; the electroplated anti-friction layer of lead-tin-copper alloy is 13～15HV25; the electroplated anti-friction layer of lead-steel alloy is 8～10HV25. mm
5 Bearing inner circle attenuation surface
JB/T 9763-1999
5.1 The surface of the electroplated anti-friction layer is not allowed to have bubbles and plating nodules. The surface of the electroplated anti-friction layer of the aluminum alloy bearing is allowed to have a small amount of dispersed microbubbles with a diameter of 0.10~0.25mm. The number is shown in Table 3. Table 3
Bearing bush outer diameter/mm
>50～75
>75～100
>100135
>135～200
5.2 The surface roughness Ra value of the electroplated anti-friction layer of the bearing bush is less than or equal to 0.4um. The maximum number of microbubbles allowed
shall be agreed upon by the supply and demand parties
5.3 The inner circle surface and the butt surface of the bearing bush shall be smooth and flat, and no scratches, bumps or crushing are allowed, but slight surface marks caused by the wall thickness measuring head are allowed.
6 Bearing bush appearance,
6.1 The tin-plated steel back surface must have a uniform appearance and should not have spots caused by the final incomplete rinsing. 6.2 Since the electroplated anti-friction alloy remains on the steel back, making the tin-plated layer uneven, if the superimposed thickness of the tin-plated layer on the steel back of the bearing and the residual electroplated anti-friction layer exceeds 2.5μm, the bearing is unqualified.
6.3 Under normal circumstances, the bearing is guaranteed not to rust within 12 months from the date of leaving the factory. 7 Warranty period of bearing
The warranty period of the bearing is 2000h. Under normal use, if the user causes damage due to poor manufacturing quality during the warranty period, the manufacturer shall be responsible for replacement.
8 Inspection rules and inspection methods
8.1 Each bearing must be inspected and qualified by the quality inspection department of the manufacturer before it can leave the factory. Inspection items include:
a) Appearance quality;
b) Surface roughness;
c) Dimensions;
d) Geometric accuracy.
8.2 Regular inspection method for the chemical composition of the electroplated anti-friction layer: a) conventional titration method (iodine method) or metastannic acid precipitation method (weight method); b) atomic absorption spectrometry.
8.3 Regular inspection method for the thickness of the electroplated alkali friction layer: a) coulometer measurement method;
b) microscopic metallographic measurement method of the electroplated anti-friction layer section; c) micrometer measurement method;
d) pneumatic wall thickness meter measurement method.
8.4 Test method for the adhesion strength of the electroplated anti-friction layer and the bottom alloy layer 8.4.1 The test for evaluating the adhesion strength of the electroplated anti-friction layer and the bottom alloy layer must be carried out within 1 hour after electroplating, and the bearing should be at room temperature. 216
JB/T 9763--1999
8.4.2 First, use a piece of soft cloth dipped in trichloroethylene to gently wipe the surface of the bearing to remove oil stains. Do not scratch the surface of the bearing. 8.4.3 Hold a sharp knife with an angle of 5°~10° to the vertical direction, and cut the electroplated anti-friction layer into a diamond shape as shown in Figure 2. The distance between the cutting lines is 6~10mm, and the acute angle of the diamond shape is between 50°~80°. Tape
Diamond grid
Figure 2 Test method for bonding strength between electroplated anti-friction layer and alloy layer of bearing Note: Since fingerprints on the surface of the bearing will affect the test results, cotton gloves must be worn during inspection. 8.4.4 Stick a newly peeled 38mm wide fiber cloth tape on the bearing grid as shown in Figure 2, with a length of 25~30mm, and then rub the tape with a smooth hard round wooden stick to achieve a good fit between the fiber cloth tape and the electroplated anti-friction layer (the adhesion of the fiber cloth tape is about 8N per 25mm width).
8.4.5 Evaluation of bonding strength test results
If the electroplated anti-friction layer in the diamond is peeled off or peeled off, it indicates poor bonding. Except for cutting off some of the plating at the intersection of the sharp angles of the grid when drawing the diamond grid, the electroplated anti-friction layer with good bonding should not be peeled off or peeled off. 8.4.6 The storage temperature of the fiber cloth tape shall not exceed 40℃, and the shelf life shall not exceed 12 months. 8.5 When the purchaser conducts random inspection of product quality, it shall conduct inspections on the inspection contents specified in this standard according to the sampling inspection rules agreed upon by the supply and demand parties in accordance with GB/T2828.
9 Other technical requirements for bearings
Except as specified in this standard, other technical requirements for bearings shall comply with the provisions of GB/T1151.
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