JB/T 53396-2000 Hydraulic Parts Cylindrical Helical Spring Product Quality Classification JB/T53396-2000 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T53396-2000
Hydraulic Parts Cylindrical Helical Springs
Product Quality Classification
(Internal Use)
Published on 2000-03-30
National Bureau of Machinery Industry
Implemented on 2000-10-01
JB/T53396-2000
This standard is a revision of JB/T53396-94 "Hydraulic Parts Cylindrical Helical Springs Product Quality Classification". During the revision, the original standard was edited, and the main technical content remained unchanged. This standard replaces JB/T53396-94 from the date of implementation. This standard is under the jurisdiction of the National Technical Committee for Spring Standardization. The drafting units of this standard are: Mechanical Science Research Institute, Hangzhou Spring Factory, and Shanghai Spring Research Institute. 1 Scope
Machinery Industry Standard of the People's Republic of China
Hydraulic Parts Cylindrical Helical Springs
Product Quality Grading
(Internal Use)bzxZ.net
This standard specifies the quality grade of hydraulic parts cylindrical helical springs. JB/T53396—2000
Replaces JB/T53396—94
This standard applies to the quality inspection, review, industry quality evaluation and product grade evaluation of hydraulic parts cylindrical helical springs produced in accordance with national standards and industry standards.
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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1239.2—1989
GB/T 1805—1985
GB/T2828—1987
JB/T3338—1992
3 Product quality grade classification
Technical conditions for cold-rolled cylindrical helical compression springs Spring terminology
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Technical conditions for hydraulic cylindrical helical springs
3.1 All hydraulic cylindrical helical compression springs are divided into three grades: superior products, first-class products and qualified products based on their qualified quality level and use value on the basis of meeting the current standards. 3.2 Product quality indicators
Except for the quality indicators specified in Table 1, the remaining items shall be in accordance with the provisions of JB/T3338. Table 1
Fatigue test
Permanent deformation
Product upgrade
Product review
2000-03-30Approved as superior product by the State Machinery Industry Bureau
See Table 2
See Table 3
5×10%
Same as JBT3338
Same as JB/T3338
Qualified product
2000-10-01Implemented
B1, B2
4 Inspection method
4.1 Fatigue test
JB/T53396—2000
Effective number of turns n
Limit deviation
Twist ratio C
Limit deviation
±008P
Minimum deviation
4.1.1 After the spring is compressed three times to the height H under the working limit load, it is tested on the spring testing machine. The test parameter value is equal to the parameters specified in the drawing. The spring after the test is continuous and crack-free. The difference between the height after the test and the height after three compressions should not be greater than 0.25% of the spring free height H.
4.1.2 The manufacturer provides 3 groups of 1×107 fatigue test reports of different varieties every year (each group is not less than 2 pieces). If there are less than 3 varieties, it shall be provided according to the actual number of varieties.
4.2 Metallographic and decarburization
Sampling in the working circle.
4.2.1 Metallographic structure is checked with a 500x metallographic microscope. 4.2.2 Decarburization is checked with a 100x metallographic microscope. The metallographic structure and decarburization layer are not tested for springs that have not been quenched or tempered. 4.3 Hardness
Take samples from the working circle. Make four points on the hardness tester, the first point is not tested, and the average value of the three points is taken. The hardness of springs that have not been quenched or tempered is not tested.
4.4 Permanent deformation
It is carried out on a special machine or spring testing machine, and the use of tooling is allowed. Compress the spring twice to the height H (T≤0.58,) under the working limit load, and measure the difference in free height after the second and third compressions. If the difference is not greater than 0.25%H, it is considered that there is no permanent deformation. 4.5 Load (stiffness)
It is carried out on a spring testing machine with an accuracy of not less than 1%, and the use of tooling is allowed. The rigidity measurement should be measured at two points between 30% and 70% of the full deformation of the spring, and then calculated according to P
Surface defect
(N/mm) (according to GB/T1239.2). F2-F
According to the provisions of GB/T1239.2.
4.7 Verticality
JB/T53396—2000
Put the spring vertically on the 2nd level precision platform, measure it with a 3rd level precision wide seat angle ruler, rotate the spring on the wide seat angle ruler for one circle, and then check the other end (from the end to 1/2 circle, check the adjacent 2nd circle). Use a 100mm feeler gauge to determine the maximum verticality deviation. 4.8 Diameter
Measure with a vernier caliper with a graduation value of 0.02mm. If the outer diameter or middle diameter is indicated on the drawing, measure the outer diameter; if the inner diameter is indicated, measure the inner diameter. 4.9 End surface roughness
Measure visually or with a tester.
4.10 Burrs
Visually, the end ring is not allowed to have visible burrs and sharp edges. 4.11 Free height
Measure with a vernier caliper with a graduation value of 0.02mm as specified in GB/T1239.2. 4.12 Compression height
Compress the spring on the spring testing machine until the circles are in contact (the tightening pressure is not greater than 15 times the compression load), and measure its height. The value is not greater than Hmmx (Hpmax=nd).
4.13 End ring clearance
Check with a 100mm feeler gauge.
4.14 Axis Straightness
Put the spring horizontally on the 2nd level precision platform, roll it for one circle to determine the maximum bending point, and measure the gap with a 100mm feeler gauge. 5 Sampling Method
5.1 Determination of Inspection Batch
The inspection batch must be the spring products in stock, and 500 pieces are one inspection batch. If the inventory is greater than 500 pieces, the sampling personnel will arbitrarily divide it into several inspection batches of 500 pieces, and then randomly determine one inspection batch as the sampling object. If the inventory is not more than 280 pieces, it is not suitable to be sampled as an inspection batch, and another inventory product should be selected for sampling. The product expiration date is determined by the sampling personnel according to the relevant regulations of the superior and the actual situation of the manufacturer.
5.2 Non-destructive inspection items share one sample. According to GB/T2828 general inspection level I, sample size code F, normal inspection once sampling plan, 20 springs are selected. 5.3 Metallographic, decarburization and hardness inspections share one sample, and 2 springs are selected from the same inspection batch. 5.4 Fatigue test samples are 2 springs from the same inspection batch. 5.5 The total number of Class A spring samples is 22, and the total number of Class B and C spring samples is 24. 6 Grade Assessment
6.1 Product quality grade shall be in accordance with the provisions of Table 4. Each inspection item in the main items must reach the corresponding AQL value. Defects in general inspection items are calculated cumulatively. 6.2
Defects are called serious defects, and defects that appear in general projects are called light defects. 3
Project name
Metallography, decarburization
Verticality
Permanent deformation
Outer (inner) diameter
End ring clearance
Free height, load
End surface roughness, surface defects
Metallography, decarburization
Outer (inner) diameter
Permanent deformation
JB/T53396—2000
Free height, load, verticality,
End surface roughness, end ring clearance, surface defects Fatigue test
Metallography, decarburization
Outer (inner) diameter
Verticality, end surface roughness,
Surface defects, axis straightness
Fatigue test
Metallography, decarburization
Outer (inner) diameter
Pressing height
Surface defects, verticality,
End surface roughness, axis straightness
Superior products
Qualified products
Project name
Fatigue test
Metallography, decarburization
Outer (inner) Diameter
Free height, verticality,
End ring clearance, surface defects
JB/T53396—2000
Table 4 (Complete)
Superior products
Qualified products
Republic of China
Mechanical industry standards
Hydraulic parts cylindrical helical springs
Product quality classification
(Internal use)
JB/T53396-2000
Published and issued by the Mechanical Science Research Institute
Mechanical Science Printed by the Institute
(No. 2 Shouti South Road, Beijing, zip code 100044)*
1/16 sheet 1/2
Format 880×1230
First edition in September 2000
Print run 1-500
2 Word count 12000
First printing in September 2000
Price 1000 yuan
2000-113
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn00096
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