JB/T 8921-1999 Inspection rules for rolling bearings and their commodity parts
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T8921-1999
Rolling bearings and conncrcial parts-Inspection rules
Rolling bearings and conncrcial parts-Inspection rules1999-06-28Promulgated
National Machinery Industry Bureau
200-01-01Implementation
JB/T8921-999
The standard is a revision of ZBJ11020-89 Rolling bearings and conncrcial parts inspection rules 3, and has a major change in content compared with the original standard. The inspection clauses for roller bearings and bearing accessories are added to the standard: the sampling case form and the section on the submission of the approval are removed.
This standard replaces B311020-89 from the date of implementation. This standard is also proposed and managed by the National Technical Committee for Standardization of Rolling Bearings. The drafting unit of this standard: Luyang Bearing Research Institute. The main drafter of this standard: Zhang Hongyou.
This standard was first issued in 1983 as JB3371 and revised for the first time in 1989. This is the second revision.
Standard of the Machinery Industry of the People's Republic of China
Rolling bearings and commercial parts-inspection rules
Rolling bearings and commercial parts-inspection rulesJB/T8921—1999
Reply to ZIJ11020--89
This standard specifies the inspection and testing of rolling bearings and their commercial parts (steel balls, needle rollers, rollers and chains, accessories). The inspection method shall comply with the provisions of GB 2828.
This standard is applicable to the final inspection and testing of rolling bearings and their commercial parts by the quality department of the manufacturer and the subscriber. 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 will be valid, all standards will be revised, and the parties using this standard should discuss the possibility of using the latest version of the following standards. GE/T 2928—1987
JB1255—1991
3 Definitions and symbols
4: Single inner diameter deviation
Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) Technical conditions for heat treatment of high carbon chromium bearing steel rolling bearing parts : Single radial half-surface average inner diameter deviation (for tapered bore bearings, only refers to the theoretical small end of the inner hole) 4: Basic circular bore theoretical large end academic average inner diameter deviation; Single radial plane inner diameter variation Shu
To: Average inner diameter variation (only applicable to circular bores) d: Double-direction thrust bearing shaft washer single radial plane average inner diameter deviation Vze: Double-direction thrust bearing shaft washer single radial plane inner diameter variation 4D,: Single outer diameter deviation
4D Product: Single radial plane average outer diameter deviation V Product ：Single-radial plane outer diameter moving plate
Vm: Average outer diameter change
D: Outer ring flange single outer diameter false difference
G: Radial clearance
G,: Axial play
K: Radial runout of the inner drawing of the bearing
5.: Radial runout of the outer bearing
S: Runout of the inner datum end face to the inner hole
Approved by the State Machinery Industry Bureau on 1999-06-28, 2000-01-01 Implementation
JB/T89211999
Product: Variation of the inclination of the outer diameter surface generatrix to the reference end face S1: Variation of the inclination of the outer diameter surface generatrix to the outer convex back face S: Runout of the inner circle end face of the complete bearing to the raceway 5.: Runout of the outer end face of the complete bearing: Runout of the outer flange back face of the complete bearing to the raceway: Thickness change of the inner ring raceway to the inner hole
K: Variation of the thickness of the outer circle raceway to the outer surface S: Parallelism of the inner raceway to the base end face, variation of the thickness of the shaft raceway to the bottom surface 5: Parallelism of the outer raceway to the reference end face, variation of the thickness of the seat ring rolling to the bottom surface Moving plate: actual width deviation of round chain roller bearing
T: actual width deviation of the bearing composed of the inner component of the round chain roller bearing and the standard outer component4T: actual width deviation of the bearing composed of the outer component of the round chain roller bearing and the standard inner component: single diameter deviation of the wheel needle roller shaft carbon bolt A: full length deviation of the wheel needle roller bearing screw 4B: single width deviation of the inner circumference
P: inner ring width variation
4亡: single width deviation of the outer ring
Vst: outer width variation
: single width deviation of the outer convex part
Ye.: outer diameter variation
F! Deviation of the single minimum inner diameter of the needle assembly of the complete bearing set D: Deviation of the inner diameter of the single flat groove of the component
D: Thrust washer inner diameter deviation
D: Deviation of the average outer diameter of the single plane of the component
4D.: Thrust ring outer diameter screen
B: Deviation of the cage width of the centripetal rolling return and cage assembly45: Deviation of the thickness of the thrust washer diagram5
: Variation of the reduction of the bottom surface of the thrust washer on the rolling test Vp: Variation of the ball diameter
Se: Spherical error
VL: Rolling element batch true diameter Variation
: Deviation of the average straightness of the needle in a single radial plane VD: Variation of the diameter of the roller (micro needle) in a single radial plane L Roller (silver needle) single length deviation
Play: Roller batch length variation
Spm: Roller end face runout
D-.: Difference in average diameter at both ends of the roller
4Cr: Roundness error
220: Four-corner deviation
V?L: Variation of batch round can angle
D,: Middle diameter of the shrinkage surface of the male sleeve J B/T8921$999
4m: Dimensional bushing single plane uniform inner diameter deviation 4: Conical bushing tapered small end single straight deviation: Nut weight deviation
4B.: Case sleeve width deviation
, withdrawal sleeve width deviation
AD: Dimensional bushing round chain large end single suitable diameter deviation M: Deviation of the characteristic diagram M
Amp-dp: Dimensional bushing round male surface and the only angle of the wolf K: Chain shaped bushing diagram chain surface to the inner hole diameter constraint diagram 5: Nut base filling end face (30° to negative End face) circular runout Vog: Variation of the tapered sleeve in a single radial plane in % Vanp: Variation of the average inner diameter of the forming sleeve Valn: Variation of the pad skin
: Variation of the nut width
4 Inspection requirements
4. Qualification water (L)
4.1.1 Finished rolling bearings
The AQL of the main inspection items shown in Table 1 is 1.5, and the AQL of the secondary inspection items is 4: The AQL of the main inspection items shown in Table 2 and Table 3 is about 4, and the AQL of the secondary inspection items is 6.5. Dissolved products (except for radial and vertical products specified in Table 2 and Table 3) Oil sample inspection item number
Main five inspection items
and variation [
d or centrifugal excitation (roller bearing internal diameter deviation outside diameter deviation and variation (: 0: 4:%, *5 or centrifugal excitation (excitation) bearing circumscribed circle diameter deviation 1
G, or G
So: Sst
5,: 5,
S... s.... S.
Complete bearing performance value
Assembly error
Change safety items
ac,: ac,i K.; Yel.
Strength
Surface roughness of mating surface and phosphorus surface
Flexibility of circulation, sealing of temporary bearing
External appearance
Marking and oil protection mirror
Inner diameter deviation of bearing with seat
JBT8921-1999
Table 2 Sampling inspection items of spherical shaft and braided sleeve with seat Main inspection items
Ball center height H of vertical seat bearing, ball center height 4 of square, shaped and shaped seat bearingThe outer diameter of the boss of the convex bearing, the outer diameter D of the convex seat bearing, the limit deviation of A, the limit deviation of the sliding block seat, the limit deviation of H and the position deviation of the two sides, the position deviation of the screw hole of the convex and convex bearing, the position deviation of the square hole for installation on the convex and convex seat bearing, the position deviation of the two sides of the eccentric sleeve, the roughness of the eccentric sleeve, the size deviation of the center change, the secondary inspection items, the rotation flexibility and residual magnetic strength of the seat bearing, the seat bearing The external performance of the two quantities
stamped external needle bearings, radial needle roller and cage parts, thrust roller and cage parts, holding pad waist drag sample inspection main safety inspection items
rotational flexibility of radial needle roller and cage assembly 4Dm40,
commodity parts
commodity parts inspection items and AQL are shown in Table 4-Table 8 respectively, serial number
main inspection items
external accident insurance
standard total and oil-proof rust-proof packaging
table 4-table 1 the batch diameter (length) variation items and batch rounding angle adjustment items are not allowed to be unqualified. Table 4 Sampling inspection items for commodity steel balls Inspection items Inspection items External hardness and rigidity Single steel ball impact value Main inspection items Appearance quality of workpiece surface JB/T8921-E999 Table 5 Sampling inspection items for commodity exposed needle Inspection items Inspection items Appearance quality of workpiece surface Table 6 Sampling inspection items for commodity cylindrical roller Inspection items: Daa-D.. Appearance pressure of workpiece surface Table 7 Sampling inspection items for commodity round rim paint Secondary inspection items Non-workpiece surface roughness and appearance quality AQL JR/T 8921-1999
Table 8 Commodity accessories chain sleeves,
locking screws and locking screws Sampling inspection items Main inspection items
Male sealing rate d
aD.. K ADad V
Male thread sealing rate S,
Screw system public welfare
4,2 Inspection level
Change inspection items
Chain sleeve 6:
AB: Yi ront am
Assembly chamfer
Surface assembly, appearance quality
Marking and packaging
Dynamic bearing accessories use--section inspection level (including the bearings specified in Table 3 for special inspection level S-4). Steel brand needle rollers, cylindrical rollers and round rollers use special inspection levels $-4. 4.3 Key items
4.3.1 Inspection table 9 specifies the hardness of the inner and outer sleeves of the bearings, sampling plan table 9
151-35000
>35000
Inspection set
Qualified period fixed teaching
Product parts [except accessories) degree, surface roughness inspection shall be in accordance with the table. 4.3.2
Table 10 Shaft Sample Scheme
S01-35(00
Number of Samples for Sampling
Effectiveness Determination
Number of Incompatible Consumption
Number of Incompatible Production Determination
Three pieces of product rolling pins and needle rollers are selected for each batch. They are placed on the pressure plate of the steel ball, and the bending strength of the needle drop or the compression test of the steel ball is carried out. 4.3.3
Inconsistency is not allowed. The steel ball crushing load shall comply with the provisions of T/T1255, and the rest shall comply with the provisions of the manufacturer's main department. 4.3.4 The structure, material and working surface of the bearing and its product parts and accessory samples shall not be inconsistent with the relevant standard coal inspection sampling judgment method
5. 1. Inspection procedure
a) Specify the AQL value of the acceptable quality level:
b) Specify the inspection level
) Select the sample plan type
d) The previous inspection results of the root can and the strictness and leniency rules determine the strictness of this inspection (positive belt, strict, or placement inspection). 6
The initial inspection starts with a normal inspection:
e) Submit the product batch:
) Check the packing quality and marking:
) Check the table to confirm the sampling plan:
h) Randomly select samples;
Sampling samples:
921999
) The number of unqualified products in the standard sample and the number of judgments and the number of unqualified judgments in the sampling plan are used to determine whether the batch is qualified or unqualified:bzxz.net
k) Accept the qualified batch:
1) Deal with unqualified batches
5.1 Formation of batches
5.2.1 The varieties, models, specifications, materials and process conditions of the product batches submitted for inspection are as similar as possible, and the manufacturing time is roughly similar. 5.2.2 The size of the product batches submitted for inspection and the submission method of each batch can be determined by negotiation between the manufacturer and the subscriber. 5.3 Inspection of samples
5.3.1 Inspect the sample units according to the specified inspection items to determine whether each sample is a qualified product or a qualified product. 5.3.2 The technical conditions of each item shall be in accordance with the provisions of the relevant standards. 5.4 Determination of batch conformity and non-conformity
5.4.1 When taking the first sampling inspection:
Use the first sampling inspection plan table. According to the sample inspection results, if the number of non-conformities in the sample is less than the first qualified determination number AcI, the batch of products is judged to be qualified; if the number of non-conformities is equal to or greater than the non-conformity determination number Re, the batch of products is judged to be non-conformity. 5.4.2 When taking the second sampling inspection:
Use the second sampling inspection plan table. According to the sample inspection results, if the number of non-conformities in the first sample is equal to or less than the first qualified determination number AcI, the batch of products is judged to be qualified; if the number of non-conformities is equal to or greater than the first non-conformity determination number Re, the batch of products is judged to be non-conformity. If the number of unqualified products in the first sample of size is greater than the first qualified judgment number A, and the ratio is less than the first unqualified value Re: then take the second sample of size for inspection (=n.). If the sum of the number of unqualified products found in the first sample and the second sample is equal to or less than the second qualified judgment number 4c1, then the batch of products is judged to be qualified: if the sum is equal to or greater than the second unqualified judgment number Re, then the product is classified as unqualified:
5.5 Disposal of batches
5.5.1 The batch judged to be qualified shall be accepted in batches. However, the unqualified products found during the inspection process shall be replaced by qualified products by the manufacturer. 5.5.2 The batch judged to be unqualified shall be returned to the manufacturer in batches. The manufacturer shall conduct 100% inspection on the unqualified items in the rejected batch, and after eliminating the unqualified products, submit them to the subscriber for inspection again.1 The inspection and control of the hardness of the inner and outer sleeves of the bearings shall be as specified in Table 9, the sampling plan table in Table 9
151-35000
>35000
Extract inspection set
Qualified period fixed teaching
Commodity parts [except accessories], the surface roughness inspection shall be as specified in the table. 4.3.2
Table 10 Shaft Sample Scheme
S01-35(00
Number of Samples for Sampling
Effectiveness Determination
Number of Incompatible Consumption
Number of Incompatible Production Determination
Three samples of each batch of product rolling needles shall be placed on the pressure plate of the steel ball, and the bending strength of the needle shall be tested or the compression test of the steel ball shall be carried out. 4.3.3
Inconsistency is not allowed. The steel ball crushing load shall comply with the provisions of T/T1255, and the rest shall comply with the provisions of the manufacturer's main department. 4.3.4 The structure, material and working surface of the bearing and its product parts and accessory samples shall not be inconsistent with the relevant standard coal inspection sampling judgment method
5. 1. Inspection procedure
a) Specify the AQL value of the acceptable quality level:
b) Specify the inspection level
) Select the sample plan type
d) The previous inspection results of the root can and the strictness and leniency transfer rules determine the strictness of this inspection (positive belt, strict, or placement inspection). 6
The initial inspection starts with a normal inspection:
e) Submit the product batch:
) Check the packing quality and marking:
) Check the table to confirm the sampling plan:
h) Randomly select samples;
Sampling samples:
921999
) The number of unqualified products in the standard sample and the number of judgments and the number of unqualified judgments in the sampling plan are used to determine whether the batch is qualified or unqualified:
k) Accept the qualified batch:
1) Deal with unqualified batches
5.1 Formation of batches
5.2.1 The varieties, models, specifications, materials and process conditions of the product batches submitted for inspection are as similar as possible, and the manufacturing time is roughly similar. 5.2.2 The size of the product batches submitted for inspection and the submission method of each batch can be determined by negotiation between the manufacturer and the subscriber. 5.3 Inspection of samples
5.3.1 Inspect the sample units according to the specified inspection items to determine whether each sample is a qualified product or a qualified product. 5.3.2 The technical conditions of each item shall be in accordance with the provisions of the relevant standards. 5.4 Determination of batch conformity and non-conformity
5.4.1 When taking the first sampling inspection:
Use the first sampling inspection plan table. According to the sample inspection results, if the number of non-conformities in the sample is less than the first qualified determination number AcI, the batch of products is judged to be qualified; if the number of non-conformities is equal to or greater than the non-conformity determination number Re, the batch of products is judged to be non-conformity. 5.4.2 When taking the second sampling inspection:
Use the second sampling inspection plan table. According to the sample inspection results, if the number of non-conformities in the first sample is equal to or less than the first qualified determination number AcI, the batch of products is judged to be qualified; if the number of non-conformities is equal to or greater than the first non-conformity determination number Re, the batch of products is judged to be non-conformity. If the number of unqualified products in the first sample of size is greater than the first qualified judgment number A, and the ratio is less than the first unqualified value Re: then take the second sample of size for inspection (=n.). If the sum of the number of unqualified products found in the first sample and the second sample is equal to or less than the second qualified judgment number 4c1, then the batch of products is judged to be qualified: if the sum is equal to or greater than the second unqualified judgment number Re, then the product is classified as unqualified:
5.5 Disposal of batches
5.5.1 The batch judged to be qualified shall be accepted in batches. However, the unqualified products found during the inspection process shall be replaced by qualified products by the manufacturer. 5.5.2 The batch judged to be unqualified shall be returned to the manufacturer in batches. The manufacturer shall conduct 100% inspection on the unqualified items in the rejected batch, and after eliminating the unqualified products, submit them to the subscriber for inspection again.1 The inspection and control of the hardness of the inner and outer sleeves of the bearings shall be as specified in Table 9, the sampling plan table in Table 9
151-35000
>35000
Extract inspection set
Qualified period fixed teaching
Commodity parts [except accessories], the surface roughness inspection shall be as specified in the table. 4.3.2
Table 10 Shaft Sample Scheme
S01-35(00
Number of Samples for Sampling
Effectiveness Determination
Number of Incompatible Consumption
Number of Incompatible Production Determination
Three samples of each batch of product rolling needles shall be placed on the pressure plate of the steel ball, and the bending strength of the needle shall be tested or the compression test of the steel ball shall be carried out. 4.3.3
Inconsistency is not allowed. The steel ball crushing load shall comply with the provisions of T/T1255, and the rest shall comply with the provisions of the manufacturer's main department. 4.3.4 The structure, material and working surface of the bearing and its product parts and accessory samples shall not be inconsistent with the relevant standard coal inspection sampling judgment method
5. 1. Inspection procedure
a) Specify the AQL value of the acceptable quality level:
b) Specify the inspection level
) Select the sample plan type
d) The previous inspection results of the root can and the strictness and leniency rules determine the strictness of this inspection (positive belt, strict, or placement inspection). 6
The initial inspection starts with a normal inspection:
e) Submit the product batch:
) Check the packing quality and marking:
) Check the table to confirm the sampling plan:
h) Randomly select samples;
Sampling samples:
921999
) The number of unqualified products in the standard sample and the number of judgments and the number of unqualified judgments in the sampling plan are used to determine whether the batch is qualified or unqualified:
k) Accept the qualified batch:
1) Deal with unqualified batches
5.1 Formation of batches
5.2.1 The varieties, models, specifications, materials and process conditions of the product batches submitted for inspection are as similar as possible, and the manufacturing time is roughly similar. 5.2.2 The size of the product batches submitted for inspection and the submission method of each batch can be determined by negotiation between the manufacturer and the subscriber. 5.3 Inspection of samples
5.3.1 Inspect the sample units according to the specified inspection items to determine whether each sample is a qualified product or a qualified product. 5.3.2 The technical conditions of each item shall be in accordance with the provisions of the relevant standards. 5.4 Determination of batch conformity and non-conformity
5.4.1 When taking the first sampling inspection:
Use the first sampling inspection plan table. According to the sample inspection results, if the number of non-conformities in the sample is less than the first qualified determination number AcI, the batch of products is judged to be qualified; if the number of non-conformities is equal to or greater than the non-conformity determination number Re, the batch of products is judged to be non-conformity. 5.4.2 When taking the second sampling inspection:
Use the second sampling inspection plan table. According to the sample inspection results, if the number of non-conformities in the first sample is equal to or less than the first qualified determination number AcI, the batch of products is judged to be qualified; if the number of non-conformities is equal to or greater than the first non-conformity determination number Re, the batch of products is judged to be non-conformity. If the number of unqualified products in the first sample of size is greater than the first qualified judgment number A, and the ratio is less than the first unqualified value Re: then take the second sample of size for inspection (=n.). If the sum of the number of unqualified products found in the first sample and the second sample is equal to or less than the second qualified judgment number 4c1, then the batch of products is judged to be qualified: if the sum is equal to or greater than the second unqualified judgment number Re, then the product is classified as unqualified:
5.5 Disposal of batches
5.5.1 The batch judged to be qualified shall be accepted in batches. However, the unqualified products found during the inspection process shall be replaced by qualified products by the manufacturer. 5.5.2 The batch judged to be unqualified shall be returned to the manufacturer in batches. The manufacturer shall conduct 100% inspection on the unqualified items in the rejected batch, and after eliminating the unqualified products, submit them to the subscriber for inspection again.
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