This standard specifies the types, basic parameters, main dimensions and technical conditions of hydraulic bolt tensioners. JB/T 6390-1992 Hydraulic bolt tensioners JB/T6390-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6390---92
Hydraulic Bolt Pretensioner
Published on 1992-07-14
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on 1993-07-01
Mechanical Industry Standard of the People's Republic of China
Hydraulic Bolt Pretensioner
Subject Content and Scope of Application
This standard specifies the type, basic parameters, main dimensions and technical conditions of hydraulic bolt pretensioners. JB/T639092
This standard is applicable to the pretensioning of M20~M200×6; S220×8~S500~18; YS520×20~YS900×32 bolts, and can be used as hydraulic interference connection to apply axial thrust. 2
Cited standards
GB3104
GB4879
GB7935
GB/T13384
JB2076
JB2134
JB/ZQ4000.1
JB/ZQ4000.7
JB/ZQ4000.9
JB/ZQ4000.10
JB/ZQ4314
Packaging, storage and transportation pictorial symbols
Basic dimensions of common threads (diameter 1~600mm) Tolerances and fits of common threads (diameter 1~355mm) Mechanical properties of fasteners
Bolts, screws and nut Column
Mechanical properties of fasteners
Width across flats of hexagonal fasteners
Rust-proof packaging
General technical conditions for hydraulic components
General technical conditions for packaging of electromechanical products
45° serrated thread profile and basic dimensions of hydraulic pressFactory test of hydraulic cylinder
General technical requirements for product inspection
General technical requirements for plated parts
General technical conditions for assembly
General technical conditions for painting
Basic dimensions of serrated thread
3 Types, basic parameters and main dimensions
1The type, basic parameters and main dimensions of YLD type (single-stage short type) hydraulic bolt pretensioner shall comply with the requirements of Figure 1 and Table 1. 3.1
Approved by the Ministry of Machinery and Electronics Industry on July 14, 1992 and implemented on July 1, 1993
JB/T6390—92
YLD1~ YLD3
YLD4~YLD6
M72×6
M76×6
M80×6
M80×6
M85×6
M90×6
M95×6
M100×6
JB/T639092
Continued Table 1
(min)(min)
145+Yes
The type, basic parameters and main dimensions of YLG type (single-stage high type) hydraulic bolt pretensioner shall comply with the requirements of Figure 2 and Table 2. 3.2
M72×6
M76×6
M80×6
JB/T6390—92
JB/T639092
The type, basic parameters and main dimensions of YLS (double-stage high type) hydraulic bolt pretensioner shall conform to the requirements of Figure 3 and Table 3. 3.3
34 + d
M72×6
M80×6
M90×6
M100×8
M110×6
M120×6Www.bzxZ.net
M125×6
M140×6
M160×6
JB/T6390—92
Continued Table 3
JB/T639092
The type, basic parameters and main dimensions of YLP type (ordinary type) hydraulic bolt pretensioner shall comply with the requirements of Figure 4 and Table 4. 3.4
M170×6
M180×6
M190×6
M200×6
S220×8
S240×8
S250×12
S260x 12
S280x12
S 300x 12
S320 x12
S340 × 12 | t||YS520×20
YS560×20
YS600X20
YS620X20
YS680X24
0X32
YS900×32
Model representation method
3.6 Marking example
JB/T6390-92
Continued Table 4
Specification code
Type code
D-Single-stage short type
G--Single-stage high type
S-Double-stage high type
P Ordinary type
Bolt pretensioner
YLD1 single-stage short hydraulic bolt pretensioner is marked as: YLD1 hydraulic bolt pretensioner JB/T6390
Technical requirements
4.1 The product shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. Forgings shall comply with the provisions of JB/ZQ4000.7. Cutting parts shall comply with the relevant provisions of JB/ZQ4000.2. Assembly shall comply with the provisions of JB/ZQ4000.9. 4.5. The coating of non-machined exposed surfaces shall comply with the relevant provisions of JB/ZQ4000.10. 8. 4.6 Main parts 4.6.1 Materials JB/T6390-92 The body and piston materials are made of high-strength alloy steel. Its mechanical properties shall not be lower than the provisions of >880N/mm2, >635N/mm2. 4.6.1.2 The support sleeve and sleeve materials are made of high-quality carbon structural steel, and their mechanical properties shall not be lower than the provisions of >630~780N/mm, >370N/mm2.
2 The surface hardness of the opening surface of the support sleeve and the inner hexagon side of the sleeve is 35~40HRC, 4.6.3
The surface roughness parameter R. value of the inner surface of the cylinder body and the outer surface of the piston is 1.6μum: The technical requirements of the oil cylinder shall comply with the relevant provisions of GB7935, 4.7
The internal thread tolerance of the hydraulic bolt pretensioner shall comply with the \6H grade specified in GB197. 4.8
Performance requirements of the whole machine
The deviation of the tension shall not exceed 10%;
The matching high-pressure pump shall be able to meet the working conditions of the hydraulic bolt pretensioner, comply with the relevant standards and have a product certificate of qualification 5 Test methods and inspection rules
5.1 Test methods
5.1.1 Factory test
The factory test of the hydraulic bolt pretensioner shall be carried out in accordance with the provisions of Chapter 3 of JB2134 for trial operation, external leakage and pressure resistance test. 5.1.2 Type test
Type test of hydraulic bolt pretensioner shall be carried out in accordance with the tests specified in Chapter 3 of JB2134. 5.2 Inspection rules
5.2.1 Each hydraulic bolt pretensioner shall be inspected and qualified by the inspection department of the manufacturer and shall comply with the product certificate before it can be shipped. 5.2.2 Inspection The piston stroke shall comply with the provisions of Table 1 to Table 4. 5.2.3
Inspection The allowable deformation of the outer diameter of the hydraulic bolt pretensioner is: μ, ≤ 0.00011pD
Where: u---deformation of outer diameter D, mm; p-
oil pressure.MPa;
-outer diameter of bolt pretensioner body, mm.
5.2.4 Factory inspection shall comply with the provisions of Articles 4.9 and 5.1.1. Marking, packaging, storage
Hydraulic bolt pretensioners should be equipped with product labels in obvious places. Contents include: a.
Manufacturer name;
Product name and model:
Trademark;
Date of publication;
Product number.
6.2 The packaging of hydraulic bolt pretensioners should comply with the relevant provisions of GB4879 and GB/T13384. 6.3 The packaging mark of the hydraulic bolt pretensioner shall comply with the provisions of GB191. 6.4 Storage
6.4.1 The hydraulic butterfly bolt pretensioner shall be stored in a dry and ventilated environment. Avoid the invasion of rain, snow and water, avoid contact with acids, organic agents and other substances, and shall not be exposed to sunlight for a long time. 6.4.2 The anti-rust validity period of the hydraulic bolt pretensioner is 12 months from the date of shipment from the manufacturer. 9
JB/T6390-92
Appendix A
Permissible axial force and preload force of 8.8 grade bolts
(reference)
Refer to this appendix to determine the preload tensile force of 8.8 grade bolts. This appendix does not apply to fine thread bolts.
The allowable axial force F listed in Table A1 takes into account the fatigue strength of the bolt connection, A2
Diameter d
Note: he
Pitch P
Fastening thickness.
Stress cross-sectional area A,
Allowable axial force F
-When specified in the design drawing, the tensile force shall be implemented as specified in the drawing, and when not specified, the tensile force shall be selected according to Table A1. >6
Preload tension F,
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