JB/T 53334-1999 Powder Metallurgy Automobile Shock Absorber Parts Product Quality Classification JB/T53334-1999 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T53334-1999
Powder Metallurgy Automobile Shock Absorber Parts
Product Quality Classification
(Internal Use)
National Machinery Industry Bureau
2000-06-01Implementation
JB/T53334-1999
This standard is a revision of JB/T53334-94 "Product Quality Classification of Powder Metallurgy Automobile Shock Absorber Parts". During the revision, the original standard was edited and the main technical content remained unchanged. This standard replaces JB/T53334-94 from the date of implementation. This standard is proposed and managed by the Technical Committee for Standardization of Powder Metallurgy Products. The main drafting unit of this standard: Beijing Powder Metallurgy Research Institute. The main drafters of this standard: Li Jian and Cao Baoxing. 1 Scope
Machinery Industry Standard of the People's Republic of China
Powder Metallurgy Automobile Shock Absorber Parts
Product Quality Grading
(Internal Use)
This standard specifies the product quality grade level of powder metallurgy S30 series automobile shock absorber parts. JB/T53334—1999
Replaces JB/T5333494
This standard is applicable to the product quality grade assessment of powder metallurgy S30 series automobile shock absorber parts in quality assessment, enterprise upgrading and product excellence. It can also be used as the basis for product quality and price. 2 Referenced 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 are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T19571980
GB/T5163—1985
GB/T9097.1—1988
GB/T133191991
JB/T2798—1981
Quality grading principles
Smooth limit gauge
Permeable sintered metal materials-Determination of densityDetermination of apparent hardness of sintered metal materials (excluding cemented carbide)Part 1: Materials with basically uniform hardness in cross section
Shape and position tolerancesPosition tolerances
Metallographic standards for sintered products of iron-based powder metallurgyOn the basis of complying with the current standards, products are divided into three grades: qualified products, first-class products and superior products according to their quality level and use value. 4 Quality grade indicators
Key item indicators are as specified in Table 1.
Test Items
Oil Density
Qualified Products
Main Items Indexes are as per the provisions of Table 2.
Approved by the State Machinery Industry Bureau on 1999-12-30 Valves
Superior Products
Implemented in accordance with GB/T5163
2000-06-01
Test Items
Hardness HBbZxz.net
Pearlite %
Cementite %
Inner Hole Size
B0 Outer Circle
Coaxiality
Qualified Products
Network Distribution is Not Allowed
Bench Test 2×10%
General Items Indexes are as per the provisions of Table 3.
Test items
Parallelism
Circular run-out
Vertical
Flatness
Other dimensions
Surface roughness of outer circle
Surface roughness of inner hole
Other surface roughness
Appearance quality
Qualified products
As per drawing
JB/T53334-1999
Network distribution is not allowed
Bench test 2.5×10°
As per drawing
As per drawing
Superior products
Superior products
Cracks, pits, inclusions, serious damage and oxidation are not allowed. As agreed by both parties
4.4 User opinions can refer to Table 4 for implementation.
3 boxes each
GB/T9097.1
JB/T2798
GB/T1957
Micrometer
GB/T13319
User certificate within 2 years
Testing method
Micrometer
Angle ruler
GB/T13319
GB/T13319||tt ||GBT13319
GB/T13319
Micrometer or caliper
According to the sealing method,
Use roughness sample
Qualified products
Meet the user's requirements
5 Test method
JB/T53334-1999
Users report that it is easy to use and durable
5.1 The apparent hardness is tested according to the provisions of GB/T9097.1. Superior products
Testing method
Check the user's written materials
5.2 The determination of oil density is in accordance with the provisions of GB/T5163, except that the surface of the oily sample is not cleaned and oil is not removed, but its surface is not allowed to adhere to dirt, and no excess grease is allowed (especially the concave corners and small holes). When removing excess grease on the surface, be careful not to remove the oil contained in the sample. Then weigh the mass of the oil-containing sample. In the result calculation formula, d is the oil density of the sample, m is the mass of the oil-containing sample in the air, and the others remain unchanged.
5.3 The metallographic structure shall be tested in accordance with the provisions of JB/T2798. 5.4 The geometric tolerance shall be tested in accordance with the provisions of GB/T13319. 5.5 The inner hole size tolerance shall be tested in accordance with the provisions of GB/T1957. 6 Sampling method
6.1 Sampling method
6.1.1 For product quality classification, samples can be taken at the manufacturer or the user. Sampling at the manufacturer should generally be randomly selected from a stock of no less than 500 parts; sampling at the user's site is not limited to the stock quantity. 6.1.2 The automobile shock absorber parts for which the quality grade is assessed must be products produced within 1 year. 6.2 Assessment rules
6.2.1 The quality indicators of each grade of products are divided into key project indicators, main project indicators and general project indicators. 6.2.2 When assessing the product quality grade, each indicator required by the grade must be evaluated. 6.2.3 All key items must meet the specified indicators of the grade. 6.2.4 Main project indicators
a) For superior products, according to the specified project indicators, the item qualification rate must reach 95%, but the unqualified item indicators must not be lower than the indicators of first-class products, and there must be no more than 2 unqualified items in the same project; b) For first-class products, according to the specified project indicators, the item qualification rate must reach 90%, but the unqualified item indicators must not be lower than the indicators of qualified products, and there must be no more than 2 unqualified items in the same project; c) For qualified products, according to the specified project indicators, the item qualification rate must reach 85%, but there must be no more than 2 unqualified items in the same project.
6.2.5 General project indicators
a) For superior products, according to the specified project indicators, the item qualification rate must reach 90%, but the unqualified item indicators must not be lower than the indicators of first-class products, and the number of unqualified items in the same project shall not be more than 2: b) For first-class products, according to the specified project indicators, the item qualification rate must reach 85%, but the unqualified item indicators must not be lower than the indicators of qualified products, and the number of unqualified items in the same project shall not be more than 3: ) For qualified products, according to the specified project indicators, the item qualification rate must reach 80%, but the number of unqualified items in the same project shall not be more than 3.
Mechanical Industry Standard
Powder Metallurgy Automobile Shock Absorber Parts
Product Quality Grading
(For Internal Use)
JB/T53334—1999
Published and Distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880×1230
1/16 Sheet 1/2 Word Count 8000
First Edition in March 2000
First Printing in March 2000
Print Quantity 1-500
Price 1000 Yuan
No. 99-1303
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn66
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